Alloy Steel Flat Head Socket Cap Screws

Alloy steel flat head socket cap screws are designed for countersunk assemblies where the screw head must sit flush with, or close to, the surrounding mounting surface. Their 82° countersunk head geometry reduces surface projection while the internal hex socket provides controlled installation with a hex key.

These fasteners are commonly used in machine guarding, tooling plates, fixtures, access panels, robotics, automation equipment, conveyor systems, packaging machinery, equipment covers, brackets, enclosures, and precision mechanical assemblies. A flush-mounted head can help reduce interference with moving components, improve clearance around adjacent parts, limit snag points, and create a cleaner finished surface.

Cold Headers supplies alloy steel flat head socket cap screws in a broad range of inch thread sizes and lengths, including uncommon and difficult-to-source configurations. Individual product pages provide exact thread size, overall length, nominal body diameter, head diameter, hex socket size, key engagement, and other verified dimensional information where available. Review the listed dimensions carefully to confirm compatibility with the tapped hole, countersink, surrounding components, and installation tooling.

Why Use an Alloy Steel Flat Head Socket Cap Screw?

  • Flush installation: The countersunk head is intended to sit within a properly prepared 82° countersink.
  • Reduced surface projection: Helps improve clearance around panels, guards, covers, tooling, and moving assemblies.
  • Internal hex drive: Allows installation with a hex key where external wrench clearance is limited.
  • Broad industrial use: Suitable for machinery, fixtures, automation systems, brackets, enclosures, and maintenance repairs.
  • Exact-size selection: Product pages allow engineers and purchasers to compare thread, length, body, head, and socket dimensions.

Selecting the Correct Flat Head Socket Cap Screw

Begin by confirming the required thread size and overall screw length. Then review the head diameter and countersink requirements to ensure the head seats properly without excessive projection or over-travel. The hex socket size should match the intended installation tool, while body diameter and key engagement can help confirm fit and drive access. Flat head socket cap screws should be selected for assemblies specifically designed with the appropriate countersunk geometry.

Cold Headers Inc. has supplied specialty industrial socket fasteners since 1962. Our catalog is structured to help engineers, distributors, maintenance teams, and purchasing professionals locate exact sizes, uncommon lengths, and difficult-to-find socket products 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
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0-80 x 1/8 Alloy Steel Flat Head Socket Cap Screw
List Price (per 100 pieces) $12.25
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0-80 x 3/16 Alloy Steel Flat Head Socket Cap Screw
List Price (per 100 pieces) $12.50
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0-80 x 1/4 Alloy Steel Flat Head Socket Cap Screw
List Price (per 100 pieces) $12.75
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0-80 x 5/16 Alloy Steel Flat Head Socket Cap Screw
List Price (per 100 pieces) $15.00
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0-80 x 3/8 Alloy Steel Flat Head Socket Cap Screw
List Price (per 100 pieces) $13.00
Description N/A

0-80 x 1/8 Alloy Steel Flat Head Socket Cap Screw is built for 82-degree countersunk fastening where the installed head needs to sit even with the surrounding surface. Its countersunk head is useful when designers want a minimal surface profile while retaining internal hex access for installation and service work.

It fits panel installations, service covers, bracket assemblies, and precision machinery where maintenance access and surface clearance both matter. The alloy steel material keeps the product aligned with machine-building, tooling, and industrial repair requirements that specify this fastener family. The internal hex drive supports top-side socket engagement where side access is limited.

For this 0-80 thread and 1/8 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers supports purchasing teams and engineering departments that need clear size identification for specialty socket screw requirements.

Technical Highlights

  • Material: Alloy Steel
  • Thread Size: 0-80
  • Length: 1/8 in.
  • Nominal Body Diameter (B): 0.060 in.
  • Head Diameter (A): 0.117-0.138 in.
  • Hex Socket Size (J): 0.035 in.
  • Drive Type: Internal Hex

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

 		N/A

0-80 x 3/16 Alloy Steel Flat Head Socket Cap Screw gives engineers a socket-drive fastener for assemblies where surface projection has to be minimized. The internal hex drive allows installation from above the workpiece, which is helpful in compact equipment where external wrench clearance is limited.

For fixture construction, machine covers, and production equipment, the 82-degree countersunk head helps avoid raised fastener edges without requiring external wrenching space. As an alloy steel socket fastener, it is selected for industrial assemblies that require a durable internal-hex screw where countersunk geometry and socket-drive access are important. The internal hex drive supports top-side socket engagement where side access is limited.

For this 0-80 thread and 3/16 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers supports exact-size sourcing for specialty socket products and uncommon lengths used in industrial maintenance and production work.

Technical Highlights

  • Material: Alloy Steel
  • Thread Size: 0-80
  • Length: 3/16 in.
  • Nominal Body Diameter (B): 0.060 in.
  • Head Diameter (A): 0.117-0.138 in.
  • Hex Socket Size (J): 0.035 in.
  • Drive Type: Internal Hex

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

 		N/A

0-80 x 1/4 Alloy Steel Flat Head Socket Cap Screw is commonly selected when a countersunk hole, clean top surface, and internal hex drive are part of the design. The flat-head profile is particularly useful around moving stock, operator contact areas, and assemblies where exposed screw heads should not project.

Typical uses include machine guarding, equipment covers, fixture plates, and tooling assemblies where a flush fastener helps keep the working surface clear. The material designation gives purchasing teams a clear match for equipment documents that call out alloy steel flat head socket cap screws. The internal hex drive supports top-side socket engagement where side access is limited.

For this 0-80 thread and 1/4 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers has supplied specialty socket fasteners since 1962, including flat head sizes used in machine building and repair operations.

Technical Highlights

  • Material: Alloy Steel
  • Thread Size: 0-80
  • Length: 1/4 in.
  • Nominal Body Diameter (B): 0.060 in.
  • Head Diameter (A): 0.117-0.138 in.
  • Hex Socket Size (J): 0.035 in.
  • Drive Type: Internal Hex

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

 		N/A

0-80 x 5/16 Alloy Steel Flat Head Socket Cap Screw supports flush-mounted fastening in equipment where raised hardware could interfere with covers or moving parts. Its 82-degree countersunk head is useful when designers want a minimal surface profile while retaining internal hex access for installation and service work.

The design is well suited to inspection fixtures, machine frames, material-handling equipment, and repair work that calls for a countersunk internal-hex screw. Alloy steel construction is appropriate for mechanical fastening applications where the drawing or bill of materials calls for an alloy socket screw. The internal hex drive supports top-side socket engagement where side access is limited.

For this 0-80 thread and 5/16 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers focuses on difficult-to-find socket products where exact thread, length, and head style matter to the application.

Technical Highlights

  • Material: Alloy Steel
  • Thread Size: 0-80
  • Length: 5/16 in.
  • Nominal Body Diameter (B): 0.060 in.
  • Head Diameter (A): 0.117-0.138 in.
  • Hex Socket Size (J): 0.035 in.
  • Drive Type: Internal Hex

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

 		N/A

0-80 x 3/8 Alloy Steel Flat Head Socket Cap Screw is used where the screw head must nest into an 82-degree countersink instead of standing proud of the work surface. The internal hex drive allows installation from above the workpiece, which is helpful in compact equipment where external wrench clearance is limited.

Maintenance teams use this configuration when replacing flush socket screws on guarding, covers, conveyor hardware, and other serviceable equipment. The alloy steel material keeps the product aligned with machine-building, tooling, and industrial repair requirements that specify this fastener family. The internal hex drive supports top-side socket engagement where side access is limited.

For this 0-80 thread and 3/8 in. length, the verified head data helps engineers compare countersink depth, head clearance, and tooling access. Cold Headers helps buyers match thread, length, and head style when replacement hardware must align with existing countersunk components.

Technical Highlights

  • Material: Alloy Steel
  • Thread Size: 0-80
  • Length: 3/8 in.
  • Nominal Body Diameter (B): 0.060 in.
  • Head Diameter (A): 0.117-0.138 in.
  • Hex Socket Size (J): 0.035 in.
  • Drive Type: Internal Hex

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
Brands N/A Cold Headers, Inc.
Diameter N/A 0-80
Length N/A 1/8 in N/A 3/16 in N/A 1/4 in N/A 5/16 in N/A 3/8 in
Material N/A Alloy Steel
Quantity N/A 100
Package Type N/A Box
Note N/A
Basic Diameter N/A 0.060 in
Maximum Head Diameter N/A 0.138 in
Minimum Head Diameter N/A 0.117 in
Hex Socket Size N/A 0.035 in
Minimum Key Engagement N/A