7 best helical threaded inserts

Helical threaded inserts, often referred to simply as threaded inserts or helicoil inserts, are essential components in the realm of fasteners and industrial applications. They are used to strengthen or repair threads in materials such as metal, plastic, and other materials that may not have strong or durable threads on their own. Here's what you need to know about helical threaded inserts:

1. Purpose: Helical threaded inserts serve various purposes, including improving thread durability, increasing load-bearing capacity, and preventing thread stripping or wear in applications that involve frequent assembly and disassembly.

2. Design: These inserts are typically coil-shaped, with internal and external threads. The internal threads match the size and pitch of the screw or bolt they will be used with, while the external threads match the size and pitch of the original, damaged, or weak threads in the material.

3. Materials: Threaded inserts are made from a variety of materials, including stainless steel, brass, and various alloys. The choice of material depends on the specific application's requirements, such as corrosion resistance, temperature resistance, or electrical conductivity.

4. Installation: Installing a helical threaded insert involves tapping a hole into the material and then screwing the insert into place. This creates strong and durable threads, which can securely hold screws or bolts.

5. Applications: Threaded inserts are used in a wide range of industries, including aerospace, automotive, electronics, and manufacturing. They are particularly valuable in applications where thread stripping or wear is a concern, or when materials are relatively soft or fragile.

6. Advantages: Helical threaded inserts offer several advantages, including improved thread strength, the ability to repair damaged threads, and the option to use smaller or softer materials without compromising thread integrity.

7. Brands: Various companies manufacture and distribute threaded inserts, with brands like Helicoil being one of the most well-known in the industry.

Helical threaded inserts are versatile components that play a crucial role in ensuring the longevity and strength of threaded connections in various applications.They are an essential part of the fastening and repair process, providing secure and reliable connections, even in challenging or high-stress environments.

Below you can find our editor's choice of the best helical threaded inserts on the market
  

E-Z Lok EK30820 Helical Threaded Insert Kit, 304 Stainless Steel, 1/4"-28 Thread Size, 0.500" Installed Length (Pack of 10)

E-Z LOK

Based on 193 reviews Check latest price

Product description

User questions & answers

Question: Is the tap a bottoming tap for blind holes
Answer: It's pretty close to a bottoming tap. Not a big lead like a normal thread start tap.
Question: what is the tap size/thread
Answer: It is whatever size thread you're trying to replace just the tap of specially-made oversized so you're drilling out the hole and then tapping to whatever you're trying to replace
Question: what is length of inserts
Answer: About 1/2"
Question: whats the required drill size
Answer: I honestly don't remember. I looked it up online. Don't remember a specific website. Just look drill tap size and you can find it.

E-Z Lok SK20815 Helical Threaded Insert Kit, 304 Stainless Steel, 1/4"-20 Thread Size, 0.375" Installed Length (Pack of 10)

E-Z LOK

Based on 13 reviews Check latest price

Product description

  • Product Dimensions :
  • Item model number :
  • Date First Available :
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User questions & answers

Question: Where is this made
Answer: Usa
Question: What is the total length of the tap? I am working in a very tight spot
Answer: 2-7/8 Inches

E-Z LOK 400-4-CR Threaded Inserts for Wood, Installation Kit, Stainless Steel, Includes 1/4-20 Knife Thread Inserts (6), Drill, Installation Tool

E-Z LOK

Based on 92 reviews Check latest price

Product description

E-Z LOK Knife Thread inserts provide an easy to use solution for adding machine threads to wood. Ideal for use in virtually any wood (not recommended for plywood), these inserts use a proprietary external thread for superior holding power.

  • Installation Kit With Inserts, Drill And Driver
  • Quickly Install With Included Tools
  • Brass, UNC Threads
  • Provides a strong machine thread in wood
  • Designed For Use In Furniture, Cabinetry, Storm Windows and Marine Applications

User questions & answers

Question: What is the length of the the insert
Answer: Sorry, ive installed the inserts so I can't measure them. My guess is they were 1/2".

Product features

Installation Kit - Stainless Steel Knife Thread Inserts for Wood

  • Knife Thread inserts provide superior holding power in hard woods
  • Ideal for applications ranging from furniture to tap handles to outdoor decks
  • Included drive tool speeds installation

60pcs Unified USA 304 Stainless steel Helical Thread Repair Insert Assortment Kit

GAVAN

Based on 25 reviews Check latest price

Product description

Kit Includes: 2-56 x 1.5D (6pcs), 4 - 40x1.5D (6pcs), 6-32 x 1.5D (6pcs), 8-32 x 1.5D (6pcs), 10-24 x 1.5D (6pcs), 10-32 x 1.5D (6pcs), 1/4-20 x 1.5D (6pcs), 1/4-28 x 1.5D (6pcs), 5/16-18 x 1.5D (6pcs), 3/8-16 x 1.5D (6pcs).

  • 60pcs Unified USA 304 stainless steel helical wire threaded inserts Assortment Kit
  • Stainless steel inserts are 50% stronger than the original thread
  • Kit Includes: 2-56 x 1.5D (6pcs), 4 - 40x1.5D (6pcs), 6-32 x 1.5D (6pcs), 8-32 x 1.5D (6pcs), 10-24 x 1.5D (6pcs), 10-32 x 1.5D (6pcs), 1/4-20 x 1.5D (6pcs), 1/4-28 x 1.5D (6pcs), 5/16-18 x 1.5D (6pcs), 3/8-16 x 1.5D (6pcs)

User questions & answers

Question: does this kit have a coil big enough to work for a 21mm stripped bolt hole
Answer: I work with animals, this stethoscope works great and the sounds are crisp. It sounds amazing even through fur. Highly Recommend.

E-Z Lok 400-004 Threaded Insert, Brass, Knife Thread, #4", 4-40 Internal Threads, 0.375" Length (Pack of 25)

E-Z LOK

Based on 1 reviews Check latest price

Product description

E-Z LOK Knife Thread inserts for hard wood significantly reduce the possibility of stripping when using a threaded fasteners in materials such as oak, cherry, and maple. Ideal for applications ranging from furniture to cabinetry to tap handles, E-Z LOK Knife Threads are easily installed using a bolt and jam nut or optional drive tool. Simply drill the appropriately sized hole and thread in the insert like an ordinary fastener. Proprietary external Knife Threads slice into hard wood, providing holding power superior to that of typical broad threads which crush wood during installation.

  • Provides a Strong Machine Thread In Hard Woods
  • Ideal For Use in Woods Like Oak, Cherry, and Maple
  • Designed For Use In Furniture, Cabinetry, Storm Windows and Tap Handles
  • Simply Drill the Appropriately Sized Hole and Install with Bolt/Jam Nut or Optional Drive Tool
  • Threaded Insert, Brass, Knife Thread, 4-40 Internal Threads, 0. 375" Length (Pack of 25)

User questions & answers

Question: will these work in plywood
Answer: Yes. Needless to say the wood has to be thick enough to support the height of the insert. These will work in any wood type (manufactured woods, hardwoods, softwoods, etc.) If you used in hardwoods with a high Janka rating (i.e, Purple Heart, Brazillian Cherry, Hard Maple, etc) it might more difficult to screw the insert in. I usually increase the hole size 'slightly'. Verify the right size of the hole in a piece of test material prior to doing it for the first time on your project.
Question: what is the diameter of this product
Answer: To install the insert, simply drill a 25/64 hole and thread in using a bolt and jam nut or optional drive tool. So if you need a hole that is .390 inch's in diameter, then the outer diameter of the insert is larger that that.
Question: Hi what is the outside diameter of this product
Answer: I measured the diameter as 0.5945 inches (~19/32"). I ended up using a 9/16 drill to make the hole large enough to screw into a hard maple block with their insertion tool. As others have stated, using a 3/8-16 bolt/bushing combination will have more grip than the insertion tool.
Question: Do these fit alł or most beer tap faucets
Answer: Careful! Although this is a 3/8-16 threaded insert it is a knife thread so it may not bite into the material. I tried using these in oak wood to use as a tap handle but it would not grab. I needed a coarser outside thread. These threads simply began to break off. I reverted to buying inserts from Lowes. I could not find a coarse outside threaded insert on Amazon.

Product features

Threaded Inserts

  • Superior holding power in hard wood
  • Ideal for furniture, cabinetry, display cases, tap handles, or anywhere a threaded fastener is used in wood.
  • Easy to install with bolt/jam nut or optional drive too.

Installation Kit

  • Easy to use solution for putting strong, machine threads in wood.
  • Everything needed for installation in a convenient kit.
  • Kit contains inserts, drill and installation tool.

Assortment Kit

  • Knife thread inserts are ideal for hard wood applications.
  • Assortment kit makes it easy to keep on hand the right size insert for your next job.
  • Kit contains 10 each 6-32, 8-32, 1/4-20, 5/16-18, 3/8-16

E-Z Lok EK50920 Metric Helical Threaded Insert Kit, 304 Stainless Steel, M10-1.25 Thread Size, 20 mm Installed Length (Pack of 10)

E-Z LOK

Based on 82 reviews Check latest price

Product description

User questions & answers

Question: What size drill bit is needed to remove old thread in bolt hole
Answer:
Question: are the insterts supposed to expand when you install them? I tried screwing an m7 bolt into the coil and it won't fit
Answer:
Question: Is this kit m7x1.0 on the inside or outside
Answer:
Question: Are you sure this is considered coarse thread. Anyway the thread pitch for my application is m4 0.7. That means this should work, Right
Answer:

80Pcs M8 1.25 Threaded Inserts Stainless Steel Spiral Helical Thread Insertion Kit

Check latest price

Product description

Specification:

Material: 304 stainless steel

Size & Quantity:

M8*1.25*1D  20pcs

M8*1.25*1.5D  20pcs

M8*1.25*2D   20PCS 

M8*1.25*2.5D  10PCS

M8*1.25*3D    10PCS 

Package list:

1 box * Threaded Inserts



  • ★GOOD CONNECTION PERFORMANCE: Steel thread inserts used in low-strength materials such as aluminum and magnesium can avoid thread damage and obtain good connection performance, thereby improving connection strength and improving connection conditions.
  • ★WEAR RESISTANCE: Used for parts that need to be disassembled frequently, which can greatly improve the service life and wear resistance of the thread.
  • ★ELASTICITY: Due to a certain elasticity, the thread insert can make the load distribution on each thread uniform, eliminate the pitch and tooth deviation between the screw and the screw hole, and absorb vibration, thereby improving the thread connection strength and fatigue resistance strength.
  • ★PREVENT LOOSENING: Threaded blades can prevent loosening of screws, especially for products requiring high safety factor.
  • ★EASY TO MAINTAIN: Insert the thread into a damaged screw hole, and then use the screw hole normally to avoid the loss of the workpiece.

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