12-28 x 3/8 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 12-28 thread and 3/8 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: 12-28
  • Length: 3/8 in.
  • Nominal Body Diameter (B): 0.215 in.
  • Head Diameter (A): 0.410-0.464 in.
  • Head Height: 0.140 in.
  • Hex Socket Size: 1/8 in. or 5/32 in., depending on manufacturer
  • Drive Type: Internal Hex

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

Unit of Measure

Specifications

Brands

N/A Cold Headers, Inc.

Diameter

N/A 12-28

Length

N/A 3/8 in

Material

N/A Alloy Steel

Quantity

N/A 100

Package Type

N/A Box

Search

N/A ASFHSCS.12-28.3/8

Note

Note

N/A Less Than Package Quantity Specified Plus 25%.