13 best self tapping concrete screws

• MOISTURE BARRIER: Works on concrete pads, electrical boxes, stucco, and more!
• KEEPS MOISTURE IN OR OUT: Use to protect your valuable structure by preventing moisture from seeping into holes drilled into brick!
• USE OUTSIDE ON ELECTRICAL BOXES OR HOSE REEL INSTALLATION: Also, great for installing TV mounts outside near the pool.
• HIGH PERFORMANCE CONCRETE SCREW: Great for mounting motorcycle ramps and other brackets into concrete slabs.
• FOR LIGHT DUTY CONCRETE INSTALLATION: Long lasting and tough.

User questions & answers

Question:	Do these need anchors to be used on a concrete backyard wall
Answer:	Designed to work alone. But the bit won't last for more than 2 holes. Had to get a "real " bit to finish job.
Question:	I plan on using these screws to secure hump handles to brick, do I need to use anchors with screws
Answer:	Yes they work great, here is what I used. https://www.amazon.com/gp/product/B07LB6MVXM/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 I will submit a pic on the product webpage
Question:	Would these work for flag pole mounting on a brick home? If so what size might you suggest
Answer:	Hi, the drill bit is 3/16". This is a good question and we will update our description to make it more clear. Thank you.
Question:	What size is the drill bit
Answer:	If you're referring to a brick or concrete wall, it comes with a drill bit. For best results, use an impact drill with the bit.

Product features

The Problem Red Seal Solves

Keeps moisture in or out! Use outside on electrical boxes, hose reels, concrete slabs, or for cement roofing tile installation. Any time concrete comes in contact with water, it faces a life shortening processes. In cold climates, water that seeps into a drilled hole, can freeze and cause cracking. In warm climates, water inside a hole allows for mold to grow. Both situations can cause the screw to corrode, concrete to crack, and ultimately premature failure of the structure.

Hi-Low Threads

• Offers fast driving and strong plank bonding.

One-Handed Anti-Wobble Installation

• Stick-Tight is a patented drive system featuring Phillips Square Driv, allows for one-handed, anti-wobble installation.

Diamond Tip

• The diamond tip ensures the screw will drive smoothly into the pre-drilled hole.

Angel Wings

• The screw prevents moisture damage with our proven “Angel Wings” and Red Seal washer system.
• Angel Wings under the head of the screw ensure that debris is cleared from the hole, so that the Red Seal washer can create a tight moisture barrier.

Under Head Silicon Gasket

• The under-head silicon gasket ensures a water-tight fit.

Complete Kit

• Each kit contains 12 screws, a drill bit, and a driver bit.
• Each screw comes with a proprietary long-lasting silicon washer pre-installed, that prevents moisture from entering.
• Flat Head and Hex Head Kits available
• Includes everything you need except the drill!

These are just some of the wide variety of use cases our customers have mentioned! Red Seal offers a top-quality moisture barrier screw solution that can be used for many situations at home or on the job. Let us know how you're using your Red Seal to keep moisture out!

Product description

Corrosion resistance and long lasting performance due to the EnviroSeal blue coating. Deep threads provide superior holding strength. Great for anchoring items to concrete, brick, block, or other masonry materials. The diamond tip allows for superior penetrating into hard materials. Package includes 100 screws and 1 masonry drill bit.

• Corrosion resistance and long lasting performance due to the EnviroSeal blue coating
• Deep threads provide superior holding strength
• Great for anchoring items to concrete, brick, block, or other masonry materials
• The diamond tip allows for superior penetrating into hard materials
• Package includes 100 screws and 1 masonry drill bit

User questions & answers

Question:	Do these require anchors for use with Stucco
Answer:	More than you will need
Question:	How much load capacity it has
Answer:	Tapcon is a style of screw and not a brand. And yes these are "tapcon"
Question:	are these tapcon brand
Answer:	Yes I used a regular 18 volt DeWalt drill to drill the holes and run the screws. It worked fine but I went to hardware store and got a concrete bit for impact driver and it was a huge improvement for as speed up the hole drilling
Question:	Can you use a regular (non-impact) drill for these
Answer:	I'm not sure of what you mean. In lieu of attaching things to concrete using special nails that are shot into the concrete, you can use a masonry drill bit to create the hole into with you install these screws.

Product description

Corrosion resistance and long lasting performance due to the EnviroSeal blue coating. Deep threads provide superior holding strength. Great for anchoring items to concrete, brick, block, or other masonry materials. The diamond tip allows for superior penetrating into hard materials. Package includes 100 screws and 1 masonry drill bit.

• Corrosion resistance and long lasting performance due to the EnviroSeal blue coating
• Deep threads provide superior holding strength
• Great for anchoring items to concrete, brick, block, or other masonry materials
• The diamond tip allows for superior penetrating into hard materials
• Package includes 100 screws and 1 masonry drill bit

User questions & answers

Question:	Do these work for nails too
Answer:	the Drill Bit that came with the Fasteners (qty 100) was a 5/32; it lasted for 2.5 holes drilled into concrete. I purchased additional 5/32 drill fits to finish the job.
Question:	What size is the enclosed drill bit and will it last to drill as many holes as there are screws in the package
Answer:	I used a Phillips #2 driver.
Question:	what size of phillips is used to avoid stripping the head
Answer:	They are self tapping in concrete or masonry but you need to drill a pilot hole first. The box comes with one bit of the appropriate size but I would suggest buying 4-5 more, you have to use special concrete bits and not the ones you usually use in wood. You also need a powerful drill, the $20 manager's special won't do the job.
Question:	Do you need to tap the concrete before screwing in the screws? Or are they self tap screws
Answer:	Just tear off the Shrink Capsules with scissor or other tool.

Product description

We stock a wide variety of fasteners ideal for many applications arround the home, farm, business, automotives, and in industry. Most of our fasteners have a light zinc plating over steel giving a more rust resistant finsh. We also sell coated and stainless products for additional rust resistance. We stock many grades of fasteners ranging from low carbon steel on up to hardened, heat treated steel. Not all fasteners are applicable for all applications so be certain to test thouroughly and get the opinion of a licensed building or certified building or structural engineer before relying on these fasteners for any situations where failure would result in damage to property or person.

• Diameter: #8
• Length: 1-1/4 inch
• Material: Steel
• Finish: Grey Ceramic Coating
• Head Style: Wafer (#2 Phillips Bit)

User questions & answers

Question:	I have a cement floor, will it go through the cement
Answer:	Cement Board Screws are used for the attachment of cement boards to steel from 20-12 gauge
Question:	Are these good to use for 1/2" cement board into steel studs
Answer:	Yes - I have a hardiplank home and no screws would penetrate it but these do and they drill their own pilot hole no anchor needed unless you are talking about hanging a lot of weight on it - I have attached boards around my house windows with these alone.
Question:	Will these work for hardieplank? i’m looking to hang a mailbox on my new hardieplank siding. not sure if i should use this or use masonry but & anchor
Answer:	Yes they do have them.
Question:	Do they have the counter sink marks in the head of the screw
Answer:	Don't know for sure

Product features

Hard-To-Find Fastener

We stock a wide variety of fasteners ideal for many applications around the home, farm, business, or automotive industries. Most of our fasteners have a light zinc plating over steel giving a more rust resistant finish. We also sell coated and stainless products for additional rust resistance. We stock many grades of fasteners ranging from low carbon steel on up to hardened, heat treated steel. Not all fasteners are applicable for all applications. Be certain to test thoroughly and consult a licensed builder or engineer before relying on these fasteners for any situations where failure would result in damage to property or person.

Anchors

Hard-to-Find Fastener carries a wide variety of anchors for use in masonry, drywall, wood, and other applications

Hex Bolts

Hard-to-Find Fastener carries hex bolts in A307, Grade 5, Grade 8, Metric 8.8, and Metric 10.9, in zinc, galvanized, and stainless steel finishes

Carriage Bolts

Hard-to-Find Fastener carries carriage bolts in A307 and Grade 5 in zinc, galvanized and stainless finishes

Machine Screws

Hard-to-Find Fastener carries flat head, hex head, pan head, and many other machine screws in metric and standard sizes in zinc and stainless steel finishes

Hex Nuts

Hard-to-Find Fastener carries a wide variety of hex nuts in metric and standard sizes for any application in zinc, galvanized, and stainless steel finishes

Washers

Hard-to-Find Fastener carries a wide variety of washers in metric, standard, USS, and SAE sizes in zinc, galvanized, and stainless steel finishes

Sheet Metal Screws

Hard-to-Find Fastener carries a wide variety of sheet metal screws in hex, pan, flat, painted, and other heads in zinc and stainless steel finishes.

Wood Screws

Hard-to-Find Fastener carries wood screws in phillips, square, and star drive for interior and exterior applications

Specialty

Hard-to-Find Fastener carries a wide variety of specialty products including hitch pins, cotter pins, tension pins, hanger bolts, spacers, furniture connector bolts and many more specialty items.

Product description

Applications

The anchor is made from Carbon Steel, and is Blue. This anchor is designed for use in Concrete, Block, and Brick.

Environment

The anchor is designed for use in a Dry environment.

Head Style

The anchor is a Flat Countersunk Phillips head and is designed to prevent the head from protruding above the surface of the item being attached.

Hole Diameter/Bit Diameter

The anchor requires a 5/32" hole to be drilled in the base material (Concrete, Block, and Brick). The hole should be drilled with carbide tipped bit that meets ANSI standards and used in a hammer drill.

Driver Required

A #2 is required for driving the anchor into the base material.

Diameter of Anchor

The diameter of the anchor is 3/16".

Length Anchor

The length of the anchor is 1-1/4"

Thread Length

The length of the threads on the anchor is 1-1/4" in length.

Minimum Embedment

The minimum anchor embedment into the concrete is 1". Therefore, the anchor must be installed so that a minimum of 1" of the anchor is embedded into the concrete.

Maximum Fixture Thickness

The maximum fixture thickness or the maximum thickness of the material being fastened for a anchor is 0" to 1/4". This will ensure that the minimum embedment of 1" will be met.

Fixture Hole Diameter

The hole in the fixture or material being fastened must be larger than the designated diameter of the anchor. The 3/16" diameter anchor requires the hole in the fixture to be 1/4".

Spacing between Anchors

Each anchor must be spaced a minimum distance of 3" from each other when measured center to center.

Edge Distance

It is very important not to install the anchor any closer than 2-1/4" from an unsupported edge of the concrete.

• BIT INCLUDED IN EACH BOX-Proper bit equals improved holding values and reduced cost
• FLAT PHILLIPS HEAD--Can be driven with Phillips Screw Driver
• SELF-TAPPING-Taps threads directly into masonry and requires no other anchor
• DIAMOND POINT-Easier to drive the screw to save time

User questions & answers

Question:	Where are they made
Answer:	Most professional installers user stainless steel for outdoor applications.
Question:	Can this be used outdoors
Answer:	These screws are made to go thru "cement" board and fasten into wood floors. No screws will go into concrete without drilling a hole first.

Product description

Corrosion resistance and long lasting performance due to the EnviroSeal blue coating. Deep threads provide superior holding strength. Great for anchoring items to concrete, brick, block, or other masonry materials. The diamond tip allows for superior penetrating into hard materials. Package includes 100 screws and 1 masonry drill bit.

• Corrosion resistance and long lasting performance due to the EnviroSeal blue coating
• Deep threads provide superior holding strength
• Great for anchoring items to concrete, brick, block, or other masonry materials
• The diamond tip allows for superior penetrating into hard materials
• Package includes 100 screws and 1 masonry drill bit

User questions & answers

Question:	what is the drill bit size
Answer:	Minimum Embedment 1" Minimum Embedment 1-3/4"
Question:	What is the recommended minimum length in concrete wall
Answer:	These are manufactured in China.

Product description

1.Products include：

Blue Masonry Plastic Anchor       E7         100 Pcs

Phillps/slotted pan head screws  #10*2    100 Pcs

Masonry Drill Bit                         1/4"x4"       1 Pcs

2.Usage method：

a.Drill a hole to the recommended diameter and depth.

Clean out the hole before hammer the anchor into the hole.

b.Next, take your screw and begin driving it into the anchor, and thread it clockwise.

3.Scope of use：

Full material.

4.Product advantages：

PP anchor resistant to rust, corrosion resistance, ageing resistance, both light and tough.Can be remove easily.

5.Matters needing attention：

Choose the right drill bit before drill the hole. 

Wear gloves to protect your hands, ensure safety when performing the woodworking jobs.

• The full material plug is suitable for pre-positioned and push-through installation.
• The split in the anchor ensures three way expansion on sides for increased holding power.
• Once installed,they provide a flush,clean appearance in material.
• The set comes in re-useable, full-visibility packaging simplifies product selection and storage.
• Kit includes： #10-#12 anchor,1/4"x4"Masonry Drill Bit,#10x1" phillps/slotted pan head self-tapping screws（ANSI) and a Plastic Case.

User questions & answers

Question:	How long are the screws
Answer:	I am not sure exactly how much weight these anchors hold. It is my belief that they would easily hold 10 lbs. It is important to know that they are designed to be used in masonry/brick/block walls. I would not use the in drywall.
Question:	How much weight do these hold? I’m looking to mount a cabinet to my bathroom
Answer:	Yes I believe these anchors would work fine for a 6 lb sign on a Stucco wall. Stucco walls are typically made of sand and cement. The harder the wall, the better. These anchors work best on concrete, cinder block, and brick and mortar walls, floors, etc.
Question:	Would this work to hang a 6lb wooden sign on an exterior stucco wall
Answer:	Since the screws In the “anchor kit” are 1” long, I typically drill the hole approximately 1 1/4” deep to allow enough space for the plastic anchor to fit in flush to the wall or floor that you are working on. Tip: With some concrete walls, I found it helpful to use a 3/16” masonry drill bit to drill a pilot hole and then follow up with the 1/4” drill bit that comes in the kit. It seems to make for a tighter fit between the plastic anchor and the concrete.
Question:	How deep does one drill the hole to get a good fit
Answer:	I really don't understand the question, but I think what they want to know is what they are used with or for. They are used for mounting in concrete or brick and require a hammer drill with a 3/16 masonry bit. I then use a impact drill to install. Hope this helps. P.S. Some brands include the bit.

Product description

Applications

The anchor is made from Carbon Steel, and is Blue. This anchor is designed for use in Concrete, Block, and Brick.

Environment

The anchor is designed for use in a Dry environment.

Head Style

The anchor is a Hex Washer head and is designed to allow the head to sit on top of the surface of the item being attached.

Hole Diameter/Bit Diameter

The anchor requires a 5/32" hole to be drilled in the base material (Concrete, Block, and Brick). The hole should be drilled with carbide tipped bit that meets ANSI standards and used in a hammer drill.

Driver Required

A 1/4" is required for driving the anchor into the base material.

Diameter of Anchor

The diameter of the anchor is 3/16".

Length Anchor

The length of the anchor is 2-1/4"

Thread Length

The length of the threads on the anchor is 1-3/4" in length.

Minimum Embedment

The minimum anchor embedment into the concrete is 1". Therefore, the anchor must be installed so that a minimum of 1" of the anchor is embedded into the concrete.

Maximum Fixture Thickness

The maximum fixture thickness or the maximum thickness of the material being fastened for a anchor is 3/4" to 1-1/4". This will ensure that the minimum embedment of 1" will be met.

Fixture Hole Diameter

The hole in the fixture or material being fastened must be larger than the designated diameter of the anchor. The 3/16" diameter anchor requires the hole in the fixture to be 1/4".

Spacing between Anchors

Each anchor must be spaced a minimum distance of 3" from each other when measured center to center.

Edge Distance

It is very important not to install the anchor any closer than 2-1/4" from an unsupported edge of the concrete.

• BIT INCLUDED IN EACH BOX-Proper bit equals improved holding values and reduced cost
• SLOTTED HEX HEAD-Can be driven with a nut driver
• SELF-TAPPING-Taps threads directly into masonry and requires no other anchor
• DIAMOND POINT-Easier to drive the screw to save time

User questions & answers

Question:	What type of shaft does the drill bit have? is it sds
Answer:	Website listed on the box ( Concrete Fastening Systems, Inc.) sells the product from Cleveland, OH, USA... but can't find a 'Manufactured in... ' label. Works well though. Similar to Tapcon, but less expensive.
Question:	made in usa
Answer:	Not likely...I tried the same idea but it bogged down with a fully charged battery at about 2.5 to 3 inches. Ultimately borrowed an electric one that did the trick. Alternative might be to buy 3 or 3.5 inch screws.
Question:	Can I use a 20v impact driver to get this in concrete
Answer:	In 2000 PSI Concrete - the shear strength is 900 lbs
Question:	What is the horizontal shear strength of this anchor
Answer:	3/16 x 3-1/2

• The split in the ribbed anchors expand on two opposing sides as you tighten the screw , increased holding power
• Plastic material expansion sleeve low cost, no rust, corrosion resistance, anti-aging, good toughness
• Once anchor installed, they provide a flush, clean appearance in drywall
• Toggle bolt's wings spreads the force over the bearing surface, comes attached to a screw, use in concrete and brick
• Kit includes:anchors:#6-#8,#10-#12,#12-#14;self tapping screws：#6x1",#10x1-1/2"

User questions & answers

Question:	Is there any information on load-bearing strength
Answer:	The drill bit is a Straight Shank Hammer bit, not an SDS bit.

Product features

1

1.Drill a pilot hole into the wall.

2

2. Insert the Plastic Screw Anchor into drywall.

3

3. Insert the screw through the object you need to a fix and insert into the Plastic Screw Anchor.

4

4. Turn clockwise until a firm resistance.

Features & Benefits

The Plastic Screw Anchor has notched wings with 2 expansion points to prevent rotation of the anchor as the screw is inserted.

Tools required

• Drill
• Screwdriver

Perfect for

• Bathroom fixtures
• Curtains
• Electrical panels
• Fire Alarms
• Lighting fixtures
• Ornamental fixtures
• Shelving

DS6582-022

Kit Includes:

E6,E7,E8 anchors,

#6x1",#8x1-1/4",#10x1-1/2"pan head self-tapping screws（ANSI)

,and a plastic case

DS6585-008

Kit Includes:

E5,E6,E8 anchors,

#6x1",#8x1-1/4",#10x1-1/2" phillips,pan head self-tapping screws（ANSI) ,

and a plastic case

DS6688-010

Kit Includes:

#6-#8,#10-#12,#12-#14 anchors,

, #6x1",#10x1-1/2 phillips,pan head self-tapping screws（ANSI)

and a plastic case

Product description

Instructions for use:

-- Drill hole with drill bit

-- Clean the hole and embed the drywall anchor through the object to be fixed

-- Screw the self-tapping screw

-- The fixing is done



Why you choose us:

-- High qiality material of anchors are very durable and not easy to be broken

-- Stainless steel drywall self-drilling screws offers good corrosion resistance can ensure long time using and prolong screws lifespan

-- Expansion design increaing holding power, the ribs on the plastic anchors prevent the anchor from turning in the hole during installation

-- 11 different size and styles can meet your any requirement

-- Good use to hold your blinds or shelf, install curtains



Precautions:

-- Ribbed nylon(plastic) anchors work with various diameter sheet metal screws. Ideal for anchoring in concrete, brick or wallboard. The anchor is corrosion resistant. A pre drilled hole is required



Package Detail:

Yellow:

#6 x 30 ribbed anchors with self tapping screws ----- 20pcs

#6 x 40 ribbed anchors with self tapping screws ----- 20pcs

#8 x 40 ribbed anchors with self tapping screws ----- 20pcs

Gray:

#6 x 26 ribbed anchors with self tapping screws ----- 20pcs

#6 x 30 ribbed anchors with self tapping screws ----- 20pcs

#8 x 40 ribbed anchors with self tapping screws ----- 20pcs

White:

#6 x 30 ribbed anchors with self tapping screws ----- 20pcs

Plastic(nylon) Drywall Anchor Anchors:

#10 x 33 drywall anchor with self tapping screws ---- 20pcs

#13 x 42 drywall anchor with self tapping screws ---- 20pcs

#13 x 40 drywall anchor with self tapping screws ---- 20pcs

White PE Wings:

#9 x 18 wing anchor with self tapping screws -------- 12pcs

Total Quantity: 212pcs

• ✌ Nice Kit: Come in your hand would be a nice kit with 11 various anchors with screws can meet your any requirement, different size and styles for you to decorate your house. They are packed in a durable plastic box, convenient for your use and storage
• ✌ Quality Assurance: The plastic(nylon) material anchors are very durable and not easy to be broken, drywall self-drilling screws kit is made of high quality stainless steel, which features is strength and offers good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using and prolong screws lifespan
• ✌ Expansion design: The split in the ribbed anchors expand on two opposing sides as you tighten the screw , increased holding power,Anti-rotation structure design of the expansion sleeve, tighten the screw will not be followed in the drilling rotation
• ✌ Hollow-Wall Anchors: High quality anchors pre-drills precise hole in types of drywall - No hole preparation required, constructed from durable zinc to last for years and can be easily removed. Deep thread design provides strong engagement, locks into many sizes of drywall for maximum holding power
• ✌ Multi-purpose: These drywall anchors and screws is perfect for hanging a wall shelf in fairly soft drywall. You can use the kit to hold your blinds or shelf, and the ribs on the plastic drywall anchors prevent the anchor from turning in the hole during installation

Product description

Corrosion resistance and long lasting performance due to the EnviroSeal blue coating. Deep threads provide superior holding strength. Great for anchoring items to concrete, brick, block, or other masonry materials. The diamond tip allows for superior penetrating into hard materials. Package includes 100 screws and 1 masonry drill bit.

• Corrosion resistance and long lasting performance due to the EnviroSeal blue coating
• Deep threads provide superior holding strength
• Great for anchoring items to concrete, brick, block, or other masonry materials
• The diamond tip allows for superior penetrating into hard materials
• Package includes 100 screws and 1 masonry drill bit

User questions & answers

Question:	What kind of fastners do they go with
Answer:	8 mm socket works perfect
Question:	What is the width of the head
Answer:	5/16” socket
Question:	I'm a noob at this, what size socket is used for tightening down
Answer:	I think that would be fine. Use a few for each side. Made a bench for my wife and her obese friend to smoke darts on a cinder block wall. 2x6 mounted to the wall with a 2x12 on it so they can sit on that. Put 8 of them in a 6’ 2x6 and it holds them. Guessing 500lbs total weight. Did them both at one time a couple times, they’re big women!
Question:	How much weight will they hold.? Want to hang a 50” tv outside on brick
Answer:	These will not hold in stucco.

Product description

Corrosion resistance and long lasting performance due to the EnviroSeal blue coating. Deep threads provide superior holding strength. Great for anchoring items to concrete, brick, block, or other masonry materials. The diamond tip allows for superior penetrating into hard materials. Package includes 100 screws and 1 masonry drill bit.

• Corrosion resistance and long lasting performance due to the EnviroSeal blue coating
• Deep threads provide superior holding strength
• Great for anchoring items to concrete, brick, block, or other masonry materials
• The diamond tip allows for superior penetrating into hard materials
• Package includes 100 screws and 1 masonry drill bit

User questions & answers

Question:	How do I screw it in to the wall
Answer:	The bit for 1/4" screws is 3/16", same as Tapcons. The bit is for a drill with a Jacob's style chuck. If I were drilling more than a few holes I would buy a bit that fits a hammer drill with a SDS+ style chuck. Those drills are much faster than my small hammer drill. Is it cinder block or concrete block? No, they are not the same. Cinder block has coal cinders, fly ash or bottom cinders in the concrete and tend to be softer.
Question:	What size is the drill bit? Is one usually enough for installing 100 screws in cinder block
Answer:	Depends on the material behind the plaster. I use this on the concrete block wall which is solid and it works. I don’t know if this work for stud wall behind the plaster.

Product description

These screws are made of 410 stainless steel, high hardness (40 Rockwell C), resists corrosion in mild environments, applied to steel-work.

Standard hex washer head screw, can be easily installed with 1/4"hex driver.

Precise screw design, the thread can decrease the resistance when screwing in, prevent cracking. There is no need to drill a hole first, sharp tail is easy to drill.

Dimension: Screw Diameter: #8 (4.2mm); Screw Length: 1/2 inches (13mm); Head diameter: 6.25mm; Head Thickness: 3.1mm.

Tapping head screw, complete drilling and tapping at one time. Use the drill point for drilling first, then use the screw for tapping and fastening, which can save time and enhance efficiency.



Package Include:

50pcs #8x1/2 Inch Self-Drilling Hex Washer Head Tapping Screws

• Package Include: 50pcs. Dimension: Screw Diameter: #8 (4.2mm); Screw Length: 1/2 inches (13mm); Head diameter: 6.25mm; Head Thickness: 3.1mm.
• Made of 410 stainless steel, high hardness (40 Rockwell C), applied to steel-work.
• Standard hex washer head screw, can be easily installed with hex driver.
• Screw section is smooth without residual burrs, the thread is clear and tidy without notch, which is good for fastening.
• The thread can decrease the resistance when screwing in, prevent cracking. The sharp tail is easy to drill, there is no need to drill a hole first.

User questions & answers

Question:	Do you need to predrill a steel beam
Answer:	I wouldn’t use them for that. I would get something with a head that would countersink into the wood.
Question:	Will these work to fasten a wood deck to metal crossmembers on a trailer
Answer:	I'm not sure what you mean. Drilling or placing screws directly on a metal window frame (part of the window itself) is not advised. You make break the seal on double windows causing fogging or worse. Blinds should be hung on the wall where either interior (if it is a recessed window) or on the outside wall where there are framing 2x4 in which the window is placed. You may be running into the dry wall corner bead. This thin metal and is easily pierced with a drill bit or nail to start the screw . You can then use regular wood screws at least 1.5 inches long.
Question:	Are these ok to use on a metal window frame to hang up blinds
Answer:	I did not use any washer because the hex head is design with a built in washer, but they could use a 3/16" hole washer. I hope this will help them..
Question:	What size flat washer will work with this
Answer:	sorry the box doesn't say