Cold Headers
Cold Headers
5514 N. Elston Ave
Chicago, IL 60630
Phone: 1-773-775-7900
Fax: 1-773-775-0779
Email: sales@coldheaders.com
Website: www.coldheaders.com
Working Hours: Mon - Fri 8:00am - 4:30pm CST
Saturday - Sunday CLOSED If you have any questions, please call or email us.
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Cup Point Square Head Set Screws

Cup point square head set screws are headless threaded fasteners designed to secure collars, hubs, gears, pulleys, couplings, knobs, handles, and other shaft-mounted components. The external square head allows installation with an adjustable wrench, box wrench, or open-end wrench, while the recessed cup point creates localized rim contact with the mating surface to help secure assembled components. This traditional drive style remains widely specified for industrial equipment, maintenance applications, and legacy machinery.

Cup point geometry is commonly selected where concentrated holding contact with the mating shaft or component is desired. Depending on the mating material and installation conditions, the cup point may leave a witness mark or shallow indentation on the contacted surface. These fasteners are frequently used in power transmission equipment, agricultural machinery, pumps, conveyors, machine tools, industrial maintenance, repair operations, and OEM assemblies where a square head drive is specified.

Proper fastener selection should consider thread size, screw length, square head dimensions, wrench clearance, mating material, installation access, and acceptable surface marking. Individual product pages provide verified thread size, screw length, nominal body diameter, square head dimensions, and additional engineering information where available to assist engineers and purchasing professionals in selecting the appropriate fastener.

Cold Headers supplies cup point square head set screws in a broad range of inch thread sizes and lengths, including standard, uncommon, and difficult-to-source configurations. Our catalog is organized to simplify exact-size sourcing while providing consistent engineering information across every product family.

Why Choose Cup Point Square Head Set Screws?

  • Cup point geometry: Creates localized rim contact with the mating surface.
  • Square head drive: Designed for installation using standard wrenching tools.
  • Headless threaded design: Installs with the threaded body while providing convenient wrench engagement.
  • Industrial applications: Commonly used on collars, hubs, pulleys, gears, couplings, and shaft-mounted components.
  • Verified engineering dimensions: Product pages provide thread size, screw length, square head dimensions, and other engineering data where available.

Selecting the Correct Cup Point Square Head Set Screw

Begin by confirming the required thread size and screw length. Review the square head dimensions, available wrench clearance, mating material, required holding action, and acceptable surface marking before selecting a fastener. Cup point square head set screws should not be substituted automatically for flat point, cone point, oval point, dog point, or knurled cup point designs because each point geometry provides different contact characteristics.

Cold Headers Inc. has supplied specialty industrial fasteners since 1962. Our catalog helps engineers, distributors, maintenance teams, and purchasing professionals locate exact sizes, uncommon lengths, and difficult-to-find square head set screws without unsupported inventory claims.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.

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Unit of Measure
Items square-head-set-screw.png
1/4-20 x 3/8 SHSS Cup Point
1/4-20 x 3/8 Cup Point Square Head Set Screw
List Price (per 100 pieces) $6.00
 square-head-set-screw.png
1/4-20 x 1/2 SHSS Cup Point
1/4-20 x 1/2 Cup Point Square Head Set Screw
List Price (per 100 pieces) $5.00
 square-head-set-screw.png
1/4-20 x 5/8 SHSS Cup Point
1/4-20 x 5/8 Cup Point Square Head Set Screw
List Price (per 100 pieces) $5.50
 square-head-set-screw.png
1/4-20 x 3/4 SHSS Cup Point
1/4-20 x 3/4 Cup Point Square Head Set Screw
List Price (per 100 pieces) $6.00
 square-head-set-screw.png
1/4-20 x 7/8 SHSS Cup Point
1/4-20 x 7/8 Cup Point Square Head Set Screw
List Price (per 100 pieces) $6.50
Description N/A

1/4-20 x 3/8 Cup Point Square Head Set Screw is a case hardened carbon steel set screw built around an external square head instead of a recessed drive. The open square head is useful when a standard wrench is preferred and the drive must stay visible during adjustment.

Common applications include crushers and aggregate equipment, where exposed wrench flats remain easy to reach during service. For compact headless retention with key access, compare cup point socket set screws in alloy steel or 18-8 stainless steel.

Fine-thread and longer square-head sizes are a hard-to-find lane, so exact thread and length identification matters before sourcing. Review the thread, length, square-head dimensions, and cup point diameter before substituting another set screw style.

Technical Highlights

  • Head: Square, wrench-driven; flats match nominal size
  • Point: Cup Point
  • Thread Size: 1/4-20 (Class 2A)
  • Length: 3/8 in.
  • Width Across Flats: 0.250 max / 0.241 min in.
  • Width Across Corners: 0.354 max / 0.331 min in.
  • Head Height: 0.196 max / 0.178 min in.
  • Cup Point Diameter: 0.132 max / 0.118 min in.
  • Material: Carbon Steel, case hardened per ASME B18.6.2 (case hardness 83 HR15 minimum, case depth 0.006 in. minimum)
  • Finish: Plain
  • Dimensional Standard: ASME B18.6.2

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.

 		N/A

For legacy equipment built around open wrench access, the 1/4-20 x 1/2 Cup Point Square Head Set Screw keeps the drive on four exposed flats. Because there is no internal recess, the drive is less likely to pack with debris during plant maintenance or field repair.

Agricultural implements and tillage equipment often keep square-head set screw callouts because field adjustment with common wrenches matters. Because a square head protrudes and rotates with the shaft, exposed rotating assemblies near personnel may call for a guarded headless set screw instead.

Cold Headers supports industrial distributors, repair teams, and OEM buyers who need a precise thread, length, and point style without substituting geometry. Review the thread, length, square-head dimensions, and cup point diameter before substituting another set screw style.

Technical Highlights

  • Head: Square, wrench-driven; flats match nominal size
  • Point: Cup Point
  • Thread Size: 1/4-20 (Class 2A)
  • Length: 1/2 in.
  • Width Across Flats: 0.250 max / 0.241 min in.
  • Width Across Corners: 0.354 max / 0.331 min in.
  • Head Height: 0.196 max / 0.178 min in.
  • Cup Point Diameter: 0.132 max / 0.118 min in.
  • Material: Carbon Steel, case hardened per ASME B18.6.2 (case hardness 83 HR15 minimum, case depth 0.006 in. minimum)
  • Finish: Plain
  • Dimensional Standard: ASME B18.6.2

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.

 		N/A

1/4-20 x 5/8 Cup Point Square Head Set Screw gives maintenance crews a wrench-driven cup point fastener for machinery that still calls out square-head hardware. The cup point creates localized contact with the mating surface, while the external flats give the installer a direct wrenching surface.

Conveyor drive pulleys and shaft-mounted components can use this pattern when a protruding drive head is acceptable. Plain carbon steel is not selected for corrosion resistance; keep parts oiled in service, or ask about stainless square-head options as a non-catalog request.

For older machinery and uncommon set screw callouts, Cold Headers helps match the requested diameter, length, head style, and point configuration. Review the thread, length, square-head dimensions, and cup point diameter before substituting another set screw style.

Technical Highlights

  • Head: Square, wrench-driven; flats match nominal size
  • Point: Cup Point
  • Thread Size: 1/4-20 (Class 2A)
  • Length: 5/8 in.
  • Width Across Flats: 0.250 max / 0.241 min in.
  • Width Across Corners: 0.354 max / 0.331 min in.
  • Head Height: 0.196 max / 0.178 min in.
  • Cup Point Diameter: 0.132 max / 0.118 min in.
  • Material: Carbon Steel, case hardened per ASME B18.6.2 (case hardness 83 HR15 minimum, case depth 0.006 in. minimum)
  • Finish: Plain
  • Dimensional Standard: ASME B18.6.2

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.

 		N/A

When dirt, oil, or frequent adjustment makes internal recesses less convenient, the 1/4-20 x 3/4 Cup Point Square Head Set Screw keeps the drive accessible. This pattern remains valuable on equipment where operators repeatedly loosen, reset, and tighten the same fastener.

Mixer and auger shafts may specify square heads so crews can reset collars, hubs, or followers without a special key. For square-head specifications that call for half dog, full dog, flat, cone, or oval points, review the broader Square Head Set Screws family.

Cold Headers is a practical sourcing contact when a print still calls for square-head cup point hardware in a specific size. Review the thread, length, square-head dimensions, and cup point diameter before substituting another set screw style.

Technical Highlights

  • Head: Square, wrench-driven; flats match nominal size
  • Point: Cup Point
  • Thread Size: 1/4-20 (Class 2A)
  • Length: 3/4 in.
  • Width Across Flats: 0.250 max / 0.241 min in.
  • Width Across Corners: 0.354 max / 0.331 min in.
  • Head Height: 0.196 max / 0.178 min in.
  • Cup Point Diameter: 0.132 max / 0.118 min in.
  • Material: Carbon Steel, case hardened per ASME B18.6.2 (case hardness 83 HR15 minimum, case depth 0.006 in. minimum)
  • Finish: Plain
  • Dimensional Standard: ASME B18.6.2

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.

 		N/A

1/4-20 x 7/8 Cup Point Square Head Set Screw is a square-drive, cup-point set screw for assemblies where the head itself provides the wrenching surface. The square flats also make the part recognizable on older assemblies that were designed before headless hex-socket set screws became common.

Mill and grinder adjustments use this style where rugged wrench access is part of the original machine design.

This family includes uncommon square-head lengths, making the exact size useful for replacement searches and legacy drawings. Review the thread, length, square-head dimensions, and cup point diameter before substituting another set screw style.

Technical Highlights

  • Head: Square, wrench-driven; flats match nominal size
  • Point: Cup Point
  • Thread Size: 1/4-20 (Class 2A)
  • Length: 7/8 in.
  • Width Across Flats: 0.250 max / 0.241 min in.
  • Width Across Corners: 0.354 max / 0.331 min in.
  • Head Height: 0.196 max / 0.178 min in.
  • Cup Point Diameter: 0.132 max / 0.118 min in.
  • Material: Carbon Steel, case hardened per ASME B18.6.2 (case hardness 83 HR15 minimum, case depth 0.006 in. minimum)
  • Finish: Plain
  • Dimensional Standard: ASME B18.6.2

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
Brands N/A Cold Headers, Inc.
Diameter N/A 1/4-20
Length N/A 3/8 in N/A 1/2 in N/A 5/8 in N/A 3/4 in N/A 7/8 in
Material N/A Carbon Steel
Shape N/A Square
Quantity N/A 100
Package Type N/A Box
Note N/A Less Than Package Quantity Specified Plus 25%.

1 1/8" Diameter and Larger also Stocked Prices on Application.