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5/16-18 x 1 1/2 Alloy Steel Low Head Socket Cap Screw is specified when machine design requires internal-hex fastening with a reduced head height. Its alloy steel construction and internal hex drive support compact mechanical fastening without requiring an external wrenching surface.

Common use cases include guarding and machine covers, where the reduced head height helps preserve clearance around moving parts and service panels. It can also support robotics and automation systems, where compact socket screws help designers work inside tight machine envelopes. Internal hex drive engagement keeps the wrenching feature within the head, supporting compact installation and service access.

Because low-head dimensions are controlled by nominal screw diameter rather than length, this fastener should be selected by thread, length, and the available clearance above the assembly.

Technical Highlights

  • Material: Alloy Steel
  • Thread Size: 5/16-18
  • Length: 1 1/2 in.
  • Basic Diameter: 0.312 in.
  • Head Diameter: 0.431-0.437 in.
  • Head Height: 0.152-0.158 in.
  • Hex Socket Size: 5/32 in.
  • Minimum Key Engagement: 0.110 in.
  • Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

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 5/16-18

Length

 N/A 1 1/2 in

Basic Diameter

 N/A 0.312 in

Maximum Head Diameter

 N/A 0.437 in

Minimum Head Diameter

 N/A 0.431 in

Maximum Head Height

 N/A 0.158 in

Minimum Head Height

 N/A 0.152 in

Hex Socket Size

 N/A 5/32 in

Minimum Key Engagement

 N/A 0.110 in

Material

 N/A Alloy Steel

Quantity

 N/A 100

Package Type

 N/A Box

Search

 N/A ASLHSCS.5/16-18.1 1/2

Note

Note

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