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Black oxide alloy steel socket head cap screw 5/16-18 thread 3 1/4 inch length 1/4 inch drive

Kerr Lakeside

Kerr Lakeside 31C325KCS 5/16"-18 Rim Screw

SKU CH-TQ14-B4D84

A 5/16"-18 alloy-steel socket head cap screw with black oxide finish, 3 1/4 in length and 1 1/8 in thread length

  • 5/16"-18 thread fits standard rim patterns
  • 3 1/4" length secures thick wheel assemblies
  • Alloy steel construction resists high clamping loads
  • Black oxide finish protects against corrosion
  • 1/4" socket drive enables quick installation

Rim Screw 5/16"-18 Thread

This Kerr Lakeside socket head cap screw uses a 5/16"-18 thread size for inch-system fastening. It is made from alloy steel with a black oxide finish for corrosion resistance. The 1/4-inch socket drive allows installation with standard hex keys. Builders and mechanics select it for secure rim assembly and general hardware tasks.

Partially Threaded 3 1/4-Inch Length

The fastener measures 3 1/4 inches overall with a minimum thread length of 1 1/8 inches. This partially threaded design provides a smooth shank section for shear strength and alignment. It handles clamping loads where full thread engagement is not required. The grip length limits use in thicker material stacks that exceed the unthreaded portion.

ASME B18.3 Dimensional Standard

Manufacturing follows ASME B18.3 for head dimensions and thread geometry. Head height is 0.312 inches and head diameter is 0.469 inches. This standard ensures interchangeability with other compliant socket head cap screws. Buyers needing a different dimensional standard or a fully threaded shank must choose another part number.

Highlights

  • 5/16"-18 thread fits standard rim patterns
  • 3 1/4" length secures thick wheel assemblies
  • Alloy steel construction resists high clamping loads
  • Black oxide finish protects against corrosion
  • 1/4" socket drive enables quick installation

Specifications

BrandKERR LAKESIDE

Questions about this item

Will the 5/16"-18 thread on this rim screw match the existing holes in my older wheel assembly?

The screw uses a 5/16"-18 thread size, which is a standard inch-based specification; verify that your wheel's threaded holes share the same diameter and pitch before installation.

How can I confirm the black oxide finish and alloy steel construction are correct once the screw is installed?

After installation, inspect the head for the characteristic dark black oxide colour and check that the 1/4 in socket drive engages cleanly; the alloy steel body provides the expected strength for the application.

Does the small pack contain multiple screws or just the single 3 1/4 in fastener, and are any washers or drivers included?

The small pack supplies the socket head cap screws only; washers and a 1/4 in socket driver are not included and must be sourced separately.

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