Square Head Set Screws (1/2 Dog, Full Dog, Flat Point, Cone Point & Oval Point)

Square head set screws are externally driven threaded fasteners designed to secure collars, pulleys, gears, couplings, hubs, levers, adjustment mechanisms, and other shaft-mounted components. The square head provides wrench engagement for installation and removal, while a variety of point styles allows the fastener to be selected for specific holding and positioning requirements across industrial mechanical assemblies.

Cold Headers supplies square head set screws in multiple point configurations, including 1/2 dog point, full dog point, flat point, cone point, and oval point styles. Each point geometry is intended for a different mechanical function, allowing engineers and maintenance professionals to select the appropriate fastener for positioning, adjustment, or shaft engagement requirements.

Manufactured for demanding industrial applications, square head set screws are commonly specified for machinery, power transmission equipment, agricultural equipment, industrial maintenance, conveyors, machine tools, pumps, valves, adjustment mechanisms, tooling, and OEM manufacturing.

Proper fastener selection should consider thread size, screw length, point style, wrench accessibility, mating material, installation clearance, and service conditions. Individual product pages provide verified engineering dimensions to assist engineers and purchasing professionals in selecting the appropriate square head set screw.

Cold Headers supplies 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.

Available Point Styles

  • 1/2 Dog Point: Short locating projection commonly used where positioning within a mating hole or slot is required.
  • Full Dog Point: Extended locating projection for applications requiring positive engagement within a mating hole.
  • Flat Point: Broad bearing surface commonly selected where reduced surface marking is preferred.
  • Cone Point: Concentrated point contact commonly selected where positive holding action is desired.
  • Oval Point: Rounded bearing surface commonly selected where repeated adjustment or repositioning is anticipated.

Why Choose Square Head Set Screws?

  • Square head design: Allows installation using standard wrenches.
  • Multiple point styles: Available for positioning, adjustment, and shaft retention applications.
  • Broad industrial use: Commonly specified for machinery, power transmission, conveyors, pumps, valves, tooling, and OEM equipment.
  • Verified engineering dimensions: Product pages provide thread size, screw length, point style, and additional engineering information where available.

Selecting the Correct Square Head Set Screw

Begin by confirming the required thread size and screw length. Review the required point style, mating material, installation clearance, and operating environment before selecting a fastener. The selected point geometry should reflect the mechanical requirements of the completed assembly, as each point style serves a different functional purpose.

Cold Headers Inc. has supplied specialty industrial fasteners since 1962. Our catalog helps engineers, distributors, maintenance professionals, and purchasing teams 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.

Request Information Search by Specification
Unit of Measure
Items
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1/4-20 x 1/2 Square Head Set Screw
List Price (per 100 pieces) $17.86
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1/4-20 x 5/8 Square Head Set Screw
List Price (per 100 pieces) $19.50
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1/4-20 x 3/4 Square Head Set Screw
List Price (per 100 pieces) $21.09
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1/4-20 x 7/8 Square Head Set Screw
List Price (per 100 pieces) $24.33
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1/4-20 x 1 Square Head Set Screw
List Price (per 100 pieces) $25.96
Description N/A

1/4-20 x 1/2 is a low carbon steel, case hardened square head set screw for wrench-driven holding where an external square head is acceptable.

Typical applications include mill and conveyor drives where square-head hardware remains accessible during service. This family is ordered as one size across five point choices: Half Dog, Full Dog, Cone, Oval, and Flat. Flat points bear against a machined flat without intentional penetration into the mating surface.

Since 1962, Cold Headers has helped industrial buyers identify specialty set screws by thread, length, head style, and point requirement. The family runs UNC coarse thread throughout, the traditional square-head series. Cone points are typically chosen for a spot-drilled seat when a more fixed location is desired.

Technical Highlights

  • Head: Square, wrench-driven
  • Material: Low Carbon Steel, Case Hardened
  • Point Styles: Half Dog, Full Dog, Cone, Oval, Flat (specify at order)
  • Thread Size: 1/4-20 (UNC)
  • Thread Fit: 2A (per ASME B18.6.2)
  • Length: 1/2 in.
  • Width Across Flats (F): 0.250 / 0.241 in. (max/min)
  • Across Corners (G): 0.354 / 0.331 in. (max/min)
  • Head Height (H): 0.196 / 0.178 in. (max/min)
  • 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 gives maintenance teams a classic square-head set screw with a full UNC callout and a wrench-driven head for heavy mechanical layouts.

Typical applications include pulleys and sheaves on line shafts where the head is intentionally exposed. Specify the point style at order; the same size can be supplied as Half Dog, Full Dog, Cone, Oval, or Flat. Half Dog points register into shallow holes or slots when location matters under load.

Cold Headers supports square-head set screw sourcing with a catalog organized around exact size, standard, and point selection. Review the selected point, wrench clearance, and mating feature before substitution. For cup point square heads, use the separate Cup Point Square Head Set Screws category rather than this five-point family.

Technical Highlights

  • Head: Square, wrench-driven
  • Material: Low Carbon Steel, Case Hardened
  • Point Styles: Half Dog, Full Dog, Cone, Oval, Flat (specify at order)
  • Thread Size: 1/4-20 (UNC)
  • Thread Fit: 2A (per ASME B18.6.2)
  • Length: 5/8 in.
  • Width Across Flats (F): 0.250 / 0.241 in. (max/min)
  • Across Corners (G): 0.354 / 0.331 in. (max/min)
  • Head Height (H): 0.196 / 0.178 in. (max/min)
  • 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 3/4 is built for legacy machinery and industrial assemblies that still specify a square head set screw instead of a headless socket screw.

Typical applications include large adjustment stops, travel-limit hardware, and machine fixtures. The row represents a square-head size, while the point selection is made from Half Dog, Full Dog, Cone, Oval, and Flat. Point selection should reflect the shaft feature, acceptable marking, and expected service adjustment.

Cold Headers keeps this legacy set screw family practical for maintenance, repair, and production users who still need the square-head form. Review the selected point, wrench clearance, and mating feature before substitution. Cup Point Slotted Headless Set Screws are the related headless option when flush-fitting screwdriver access is preferred.

Technical Highlights

  • Head: Square, wrench-driven
  • Material: Low Carbon Steel, Case Hardened
  • Point Styles: Half Dog, Full Dog, Cone, Oval, Flat (specify at order)
  • Thread Size: 1/4-20 (UNC)
  • Thread Fit: 2A (per ASME B18.6.2)
  • Length: 3/4 in.
  • Width Across Flats (F): 0.250 / 0.241 in. (max/min)
  • Across Corners (G): 0.354 / 0.331 in. (max/min)
  • Head Height (H): 0.196 / 0.178 in. (max/min)
  • Dimensional Standard: ASME B18.6.2

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

 		N/A

For drawings that call out a wrench-driven set screw, 1/4-20 x 7/8 identifies the coarse thread, length, material class, and square head geometry.

Typical applications include agricultural equipment with exposed mechanisms and field-adjusted stops. Use the size to match the thread and length, then call out Half Dog, Full Dog, Cone, Oval, or Flat as the required point. External wrench access is useful when an internal socket recess would be hard to keep clear.

Cold Headers brings long socket and set screw experience to older machine platforms where square-head hardware is still specified. Review the selected point, wrench clearance, and mating feature before substitution. Socket set screw families provide the internal-drive alternative where square-head projection or wrench swing will not clear.

Technical Highlights

  • Head: Square, wrench-driven
  • Material: Low Carbon Steel, Case Hardened
  • Point Styles: Half Dog, Full Dog, Cone, Oval, Flat (specify at order)
  • Thread Size: 1/4-20 (UNC)
  • Thread Fit: 2A (per ASME B18.6.2)
  • Length: 7/8 in.
  • Width Across Flats (F): 0.250 / 0.241 in. (max/min)
  • Across Corners (G): 0.354 / 0.331 in. (max/min)
  • Head Height (H): 0.196 / 0.178 in. (max/min)
  • 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 1 is a square head set screw used where an open wrench or socket can access the head and point style must be specified at order.

Typical applications include couplings and collars in heavy service where point style is part of the assembly design. Point choice is part of the order detail, with Half Dog, Full Dog, Cone, Oval, and Flat handled under this family. Flat points bear against a machined flat without intentional penetration into the mating surface.

Cold Headers keeps the record focused on usable engineering details so buyers can compare the callout against drawings and service notes. The family runs UNC coarse thread throughout, the traditional square-head series. When the assembly cannot accept an exposed square head, compare headless socket set screw families before substituting.

Technical Highlights

  • Head: Square, wrench-driven
  • Material: Low Carbon Steel, Case Hardened
  • Point Styles: Half Dog, Full Dog, Cone, Oval, Flat (specify at order)
  • Thread Size: 1/4-20 (UNC)
  • Thread Fit: 2A (per ASME B18.6.2)
  • Length: 1 in.
  • Width Across Flats (F): 0.250 / 0.241 in. (max/min)
  • Across Corners (G): 0.354 / 0.331 in. (max/min)
  • Head Height (H): 0.196 / 0.178 in. (max/min)
  • 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 in
Length N/A 1/2 in N/A 5/8 in N/A 3/4 in N/A 7/8 in N/A 1 in
Nominal Diameter of Cup and Flat Points N/A
Maximum Diameter of Cup and Flat Points N/A
Minimum Diameter of Cup and Flat Points N/A
Nominal Oval (Round) Point Radius (J) N/A
Maximum Diameter of Full Dog and Half Dog (P) N/A
Minimum Diameter of Full Dog and Half Dog (P) N/A
Full Dog Diameter (Q) N/A
Half Dog Diameter (q) N/A
Weight N/A 0.83 lb N/A 0.97 lb N/A 1.1 lb N/A 1.23 lb N/A 1.36 lb
Type N/A 1/2 Dog Cone Flat Full Dog Odd Point Oval
Material N/A Carbon Steel
Quantity N/A 100
Package Type N/A Box
Note N/A Less Than Package Quantity Specified Plus 25%.

5/16-18 x 1/2 NO longer available in Full Dog Points.