12 best four arm knobs

Four-arm knobs are a type of industrial hardware commonly used for manual adjustment, tightening, or securing tasks. These knobs are designed with a distinctive four-arm shape that provides a comfortable and ergonomic grip for users. They are utilized in various industrial and scientific applications where precise control and quick adjustments are required.Here's what you should know about four-arm knobs:

Design and Construction:
- Four-arm knobs are typically made of durable materials such as plastic, metal, or thermoplastic.
- They have a circular or cylindrical base with four extended arms radiating outward from the center.
- The arms are designed to be easy to grasp, providing a secure grip for turning and tightening.
Threaded Inserts:
- Many four-arm knobs feature threaded inserts on the underside, allowing them to be attached to threaded rods, bolts, or other compatible hardware.
- These knobs are often used to secure components in place by turning them clockwise to tighten and counterclockwise to loosen.
Applications:
- Four-arm knobs find applications in various industrial and scientific settings.
- They are commonly used on machinery, equipment, and tools that require frequent adjustments, such as calibration instruments, laboratory apparatus, and manufacturing machinery.
Variety of Sizes and Materials:
- Four-arm knobs come in different sizes to accommodate various torque requirements and grip preferences.
- They can be made from materials like plastic for lightweight applications or metal for heavier-duty tasks.
Color and Finish:
- Four-arm knobs often come in different colors and finishes, making it easy to differentiate between knobs on complex equipment or machinery.
- Some are color-coded to signify specific functions or settings.
Knurled or Smooth Texture:
- The surface texture of four-arm knobs can vary, with some featuring knurled patterns for an enhanced grip and others having a smooth finish for ease of cleaning.
Locking Mechanisms:
- Some four-arm knobs are equipped with locking mechanisms, such as set screws or ratchets, to prevent unintentional adjustments or to secure a specific position.
Customization Options:
- Depending on the manufacturer, customizations like branding, labeling, or unique shapes may be available for specialized applications.

In summary, four-arm knobs are versatile industrial hardware components used in a wide range of industrial and scientific settings. Their ergonomic design and threaded inserts make them valuable for manual adjustments and securing components, providing users with a reliable and efficient means of control. These knobs come in various sizes, materials, and configurations to suit different applications and user preferences.

Below you can find our editor's choice of the best four arm knobs on the market

Morton - HK-1525 Phenolic Four Arm Knob, Fluted Rim, Threaded Hole, 1/4"-20 Thread Size x 3/8" Thread Length, 1-1/2" Width (Pack of 5)

Morton

Based on 15 reviews Check latest price

Product description

Phenolic hand knob. Four arm design. Brass insert. Mounting type: threaded hole. Thread length: 3/8". Mounting diameter and threads per inch: 1/4"-20. Measures 1-1/2" width by 1" height.

Mounting type: threaded hole
Thread length: 3/8"
Mounting diameter and threads per inch: 1/4"-20
Brass insert
Measures 1-1/2" width by 1" height
Thread Size: 1/4"-20
Rim Style: Fluted

User questions & answers

Question:	Are these "through hole"? That is, can bolt go all the through the knob or is one end closed? I can't tell by the picture nor description
Answer:	Yes, they are "through hole". The bolt can go all the way through the knob.

Davies A10-2830-E Thermoset Four Arm knob, Flute Rim, Threaded Stud, 3/8"-16 Thread Size X 1" Thread Length, 2" Diameter (Pack of 10)

Davies Molding

Based on 11 reviews Check latest price

Product description

Another exceptional clamping strategy. Easy to handle. A family that will provide a consistent appearance. Glossy or textured finish. The top is recessed or can have a decorative inlay. Engraving, hot stamping, and pad printing available for all parts.

Mounting type: projecting stud
Thread length/depth: 1"
Mounting diameter and threads per inch: 3/8"-16
Plastic material: thermoset; insert material: steel, zinc plated
Measures 2" diameter by 1" height
Thread Size: 3/8 inches-16
Without set screw

Morton - HK-2037 Phenolic Four Arm Knob, Fluted Rim, Threaded Hole, 3/8"-16 Thread Size x 1/2" Thread Length, 2" Width (Pack of 5)

Morton

Based on 17 reviews Check latest price

Product description

Phenolic hand knob. Four arm design. Brass insert. Mounting type: threaded hole. Thread length: 1/2". Mounting diameter and threads per inch: 3/8"-16 . Measures 2" width by 1" height.

Mounting type: threaded hole
Thread length: 1/2"
Mounting diameter and threads per inch: 3/8"-16
Brass insert
Measures 2" width by 1" height
Thread Size: 3/8"-16
Rim Style: Fluted

User questions & answers

Question:	Is this a threaded through hole that will allow the bolt thread through out the other side
Answer:	If I understand your question, yes, a threaded rod or bolt will thread completely through the hole

Davies-A10-2837-H Thermoplastic Four Arm knob, Flute Rim, Threaded Through Hole, 3/8"-16 Thread Size X 1/2" Thread Length, 2-1/4" Diameter (Pack of 10)

Davies Molding

Based on 20 reviews Check latest price

Product description

Mounting type: thru-hole
Thread length/depth: 1/2"
Mounting diameter and threads per inch: 3/8"-16
Plastic material: thermoplastic; insert material: brass
Measures 2-1/4" diameter by 1" height
Thread Size: 3/8 inches-16
Without set screw

Davies A10-3022-G Thermoset Three Arm Knob, Flute Rim, Threaded Stud, 1/4"-20 Thread Size X 1/2" Thread Length, 7/8" Diameter (Pack of 10)

Davies Molding

Based on 28 reviews Check latest price

Product description

Available in heat-resistant phenolic material with a textured surface. Aesthetically pleasing and exceptionally functional. Mounting type: projecting stud. Thread length/depth: 1/2". Mounting diameter and threads per inch: 1/4-20. Plastic material: thermoset; insert material: steel, zinc plated. Measures 7/8" diameter by 3/4" height.

Mounting type: projecting stud
Thread length/depth: 1/2"
Mounting diameter and threads per inch: 1/4"-20
Plastic material: thermoset; insert material: steel, zinc plated
Measures 7/8" diameter by 3/4" height
Thread Size: 1/4 inches-20
Without set screw

Innovative Components AN4C10004P721 2.50" 4 Prong knob 1/4-20 x 1.00" steel zinc stud black pp (Pack of 10)

Innovative Components

Based on 1 reviews Check latest price

Product description

2.50" 4 Prong knob 1/4-20 x 1.00" steel zinc stud black pp

Package Dimensions: 19.05 cms (L) x 16.51 cms (W) x 5.08 cms (H)
Product Type: Mechanical Components
Package Quantity: 1
Country Of Origin: United States

Davies A10-2825-F Thermoplastic Four Arm knob, Flute Rim, Threaded Through Hole, 1/4"-20 Thread Size X 1/2" Thread Length, 1-3/4" Diameter (Pack of 5)

Davies Molding

Based on 8 reviews Check latest price

Product description

Mounting type: thru-hole
Thread length/depth: 1/2"
Mounting diameter and threads per inch: 1/4"-20
Plastic material: thermoplastic; insert material: brass
Measures 1-3/4" diameter by 1" height
Thread Size: 1/4 inches-20
Without set screw

Davies Thermoset Four Arm knob, Flute Rim, Threaded Stud, 1/4"-20 Thread Size X 3/4" Thread Length, 1.50" Diameter (Pack of 5)

Davies Molding

Based on 7 reviews Check latest price

Product description

Mounting type: projecting stud
Thread length/depth: 3/4"
Mounting diameter and threads per inch: 1/4"-20
Plastic material: thermoset; insert material: stainless steel
Meaures 1-1/2" diameter by 1" height
Thread Size: 1/4 inches-20
Without set screw

Knob, Four Arm with 1/4"-20 x 1-1/2" Stud

WOODRIVER

Based on 5 reviews Check latest price

Product description

Four Arm Knob with 1-1/2" stud is extremely easy to grasp for sure tightening in awkward positions. Phenolic 2" dia. x 1" height. About Us: Founded in Boston in 1928, Woodcraft's operations were moved to Parkersburg, West Virginia in 1989. It's been over 90 years since Woodcraft first began selling high quality woodworking tools and supplies out of a one room shop in Boston's North End, and Woodcraft is still firmly committed to providing woodworkers with superior products and expert advice. We are America’s leading supplier of saws, planes, power tools, hand tools, wood stain and paint, routers, sanding, wood, kits, dust collection and more. Our award winning family of brands includes WoodRiver, Highpoint, Woodcraft and Woodcraft Magazine as well as the greatest selection of woodworking books, videos, and plans

Thread Size 1/4"-20tpi
Phenolic 2" dia. x 1" height
WoodRiver is proudly made by Woodcraft, America’s leading supplier of saws, planes, power tools, hand tools, wood stain and paint, routers, sanding, wood, kits, dust collection and more. Our award winning family of brands includes WoodRiver, Highpoint, Woodcraft and Woodcraft Magazine as well as the greatest selection of woodworking books, videos, and plans.

Davies A10-2820AU Thermoset Four Arm knob, Flute Rim, Threaded Through Hole, 5/16"-18 Thread Size X 1/2" Thread Length, 1.50" Diameter (Pack of 10)

Davies Molding

Based on 20 reviews Check latest price

Product description

Mounting type: thru-hole
Thread length/depth: 1/2"
Mounting diameter and threads per inch: 5/16"-18
Plastic material: thermoset; insert material: brass
Measures 1-1/2" diameter by 1" height
Thread Size: 5/16 inches-18
Without set screw

User questions & answers

Question:	Will these work with 5/16-18 X 4" bolts
Answer:	they will only thread on 3/4" of an inch.
Question:	Does bolt screw all the way through or does it have plastic ring that stops bolt
Answer:	bolt doesn't go all the way thru. My husband had measured so that bolt was long enough to fit thru my cross stitch frame with enough threads on bolt to hold in place as needed.

Knob, Four Arm with Through Hole, 1/4"-20 Insert

WOODRIVER

Based on 3 reviews Check latest price

Product description

Four Arm Knob with through hole is extremely easy to grasp for sure tightening in awkward positions. Phenolic 2" dia. x 1" height. About Us: Founded in Boston in 1928, Woodcraft's operations were moved to Parkersburg, West Virginia in 1989. It's been over 90 years since Woodcraft first began selling high quality woodworking tools and supplies out of a one room shop in Boston's North End, and Woodcraft is still firmly committed to providing woodworkers with superior products and expert advice. We are America’s leading supplier of saws, planes, power tools, hand tools, wood stain and paint, routers, sanding, wood, kits, dust collection and more. Our award winning family of brands includes WoodRiver, Highpoint, Woodcraft and Woodcraft Magazine as well as the greatest selection of woodworking books, videos, and plans

Thread Size 1/4"-20tpi
Phenolic 2" dia. x 1" height
WoodRiver is proudly made by Woodcraft, America’s leading supplier of saws, planes, power tools, hand tools, wood stain and paint, routers, sanding, wood, kits, dust collection and more. Our award winning family of brands includes WoodRiver, Highpoint, Woodcraft and Woodcraft Magazine as well as the greatest selection of woodworking books, videos, and plans.

User questions & answers

Question:	Does the shipping cost decrease with multiple knobs purchased
Answer:	Thank you for your inquiry. No, the shipping charges do not decrease. You can change the quantity to view the shipping charges.

Davies Thermoset Three Arm Knob, Flute Rim, Threaded Stud, 1/4-20 Thread Size X 9/16" Thread Length, 1-1/2" Diameter (Pack of 10)

Davies

Based on 3 reviews Check latest price

Product description

Available in heat-resistant phenolic material with a textured surface. Aesthetically pleasing and exceptionally functional. Mounting type: projecting stud. Thread length/depth: 9/16". Mounting diameter and threads per inch: 1/4-20. Plastic material: thermoset; insert material: steel, zinc plated. Measures 1-1/2" diameter by 7/8" height.

Mounting type: projecting stud
Thread length/depth: 9/16"
Mounting diameter and threads per inch: 1/4"-20
Plastic material: thermoset; insert material: steel, zinc plated
Measures 1-1/2" diameter by 7/8" height
Thread Size: 1/4 inches-20
Without set screw