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HILLMAN®

4-40 x 5/8 Flat Head Socket Cap Screw — 15-Pack, Box

Mfg.#
45103-N
Sku#
5770375
  • Designed for use as 4-40 x 5/8 size screws in fastening tasks
  • Features a flat head socket cap screw profile for countersinking
  • Includes a 0.063 in hex drive size suitable for small hex keys
  • Supplied in a pack of 15, suitable for multiple assembly jobs

* Estimated stock levels as of Wed, Apr 15, 2026. All items subject to prior sale. Prices may vary between stores and online. Please call ahead to confirm availability of items marked as Limited Stock.

Description

This is a HILLMAN 4-40 x 5/8 flat head socket cap screw designed to sit flush in countersunk holes where a clean, low-profile finish is needed. The 4-40 thread and 5/8-inch length make it suited to precision fastening tasks common in small machinery, electronics enclosures, instrument panels, hobby assemblies and trim work where a compact, reliable fastener is required. The flat head provides a smooth surface once installed, and the hex socket accepts a 0.063-inch hex key for controlled torque and quick installation or removal. Use it whenever a recessed, unobtrusive head and a hex-drive connection are preferred for alignment-critical or space-constrained projects.

Specifications

General

Head Style Flat Head
Hex Size 0.063 in
Pack Qty 15
Type Screw

Dimensions

Size 4-40 x 5/8

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