What thread sizes and drive types are included in the Pachmayr 03058 Hex Head Ring & Base Screw Kit?

This 142-piece kit features 140 screws utilising a uniform 3/32" hex drive size across #6-40, #6-48, and #8-40 Imperial thread patterns in both fillister and oval head styles. The selection includes lengths ranging from 1/4" up to 9/16" to accommodate various American bolt-action and semi-automatic rifle platforms.

Are there any electrical compliance or SAA/RCM certifications required for this kit in Australia?

No electrical compliance or certifications are required. The Pachmayr Hex Head Ring & Base Screw Kit consists entirely of passive mechanical hardened alloy steel fasteners and manual accessories, meaning SAA approvals, RCM certifications, and 240V mains compatibility are completely inapplicable.

How do I safely shorten screws if they are too long for my specific scope base or ring mounts?

The kit includes a dual-purpose thread gauge that doubles as a precision shortening and grinding jig. You can thread the screw into the jig to safely trim it to your required custom length using a file or grinder without damaging the surrounding threads.

Will these Imperial screws fit European rifle receivers like Tikka or Sako?

No, these screws use standard American Imperial UNC threads (#6-40, #6-48, and #8-40) and will not fit firearms tapped for metric threads such as M3.5 or M4 commonly found on certain European platforms. You should verify your receiver's thread pitch before attempting installation.

Gunsmith Screw Kit - Pachmayr 03058

The Pachmayr Hex Head Ring & Base Screw Kit (03058) is a dedicated 142-piece gunsmithing fastener set designed to replace factory slotted scope mounting screws with non-slip hex head alternatives. Manufactured by Lyman Products from hardened alloy steel with a black finish, the kit provides 14 common scope ring and base configurations across standard #6-40, #6-48, and #8-40 Imperial thread pitches. Every screw uses a uniform 3/32" hex drive interface to reduce the risk of driver slip, cam-out, and receiver damage during optic installation.

Key Features

Complete 142-Piece Assortment: Contains 140 hardened alloy steel screws (10 of each size), one pair of tweezers for handling small parts, and one dual-purpose thread gauge and shortening jig.
Universal 3/32" Hex Drive: Eliminates slotted-screw slippage and stripping across all 14 included variations, facilitating secure torque application when mounting rings and bases.
Built-In Thread Trimming Jig: The included steel thread gauge doubles as a grinding jig, allowing gunsmiths to grind fasteners down to custom lengths without compromising thread integrity.
Organised Bench Storage: Housed in a compartmentalised plastic case measuring approximately 20.3 cm (L) × 12.7 cm (W) × 2.5 cm (H) with a total kit weight between 0.26 kg and 0.29 kg.

Product Specifications

Brand: Pachmayr (Lyman Products)
Model Number: 03058
Total Piece Count: 142 pieces
Drive Size: 3/32" hex socket (uniform across all screws)
Material: Hardened alloy steel with black finish
Dimensions: 20.3 cm × 12.7 cm × 2.5 cm (8" × 5" × 1")
Weight: 0.26 kg to 0.29 kg (0.65 lbs)
#6-40 Fillister Head Screws: 3/8", 1/2" lengths (10 each)
#6-40 Oval Head Screws: 1/4", 3/8" lengths (10 each)
#6-48 Fillister Head Screws: 1/4", 3/8", 9/16" lengths (10 each)
#6-48 Oval Head Screws: 1/4", 3/8" lengths (10 each)
#8-40 Fillister Head Screws: 1/4", 3/8", 1/2" lengths (10 each)
#8-40 Oval Head Screws: 1/4", 1/2" lengths (10 each)

Who is the Pachmayr Hex Head Ring & Base Screw Kit for?

Professional gunsmiths — relies on a 142-piece assortment featuring 14 distinct screw sizes and an integrated shortening jig to custom-fit mounting hardware to American receiver patterns.
Target shooters — eliminates cam-out and stripped heads on optic mounts by standardising all ring and base hardware to a uniform 3/32" hex drive size.
Hunters — provides direct replacements for stripped or missing factory screws on platforms using standard #6-40, #6-48, and #8-40 Imperial thread patterns.

Less suitable for: European rifle receivers tapped for metric M3.5 or M4 threads, firearm platforms requiring star/Torx-drive hardware (such as T10 or T15 fasteners), or general firearm overhauls requiring action and trigger guard hardware; these applications require a dedicated metric fastener kit, a Torx-drive optic screw set, or a broad-spectrum master action screw assortment.

SKU	PM41217LP
Model #	03058
Brand	Pachmayr
Shipping Weight	1.0000kg

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Pachmayr 03058 Gunsmith Screw Kit 142 Pieces Hex Drive

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