Pachmayr Master Gunsmith Hex Head Screw Kit - 140-Piece Precision Fastener Set

The Pachmayr Master Gunsmith Hex Head Screw Kit is a comprehensive 140-piece fastener set designed for gunsmiths, armorers, and serious shooters who need reliable replacement screws for scope mounting, base attachment, and firearm assembly work. Built around the proven 6-lobe hex head design, this kit delivers the precision fasteners that are often hard to source individually, with multiple head styles and thread sizes to cover the jobs you'll actually encounter at the workbench.

Hex head screws—especially 6-lobe variants—offer a genuine advantage over traditional slotted fasteners: superior grip, reduced cam-out, and far less risk of stripping either the screw or your driver bit. When you're working with expensive optics or critical firearm assemblies, that margin of safety matters. This kit gives you 10 pieces each of 20 different screw configurations, covering the most common specifications in modern scope mounting and gunsmithing applications.

The kit includes two essential helper tools: a set of tweezers for handling small fasteners in tight spaces, and a thread size gauge with shortening jig—a feature that saves time and prevents trial-and-error when you need to trim a screw to the exact length your application requires. Whether you're mounting a rifle scope, reassembling an AR platform, or doing warranty work on customer firearms, having these fasteners and tools organized in one kit beats hunting through bins or making emergency orders.

Organized by thread size and head style, the Pachmayr Master Gunsmith kit works with all standard 6-lobe hex drivers and bits, making it compatible with the tools you likely already have in your kit.

Key Features

• 140 precision fasteners in 20 size configurations—10 of each
• 6-lobe hex head design resists cam-out and stripping
• Multiple thread sizes (#6-40, #6-48, #8-40) and lengths to fit standard scope and base mounting
• Both fillister head and oval head styles for different application needs
• Includes tweezers for precision handling in tight spaces
• Thread size gauge and shortening jig included for custom fitting
• Compatible with all standard 6-lobe hex drivers and bits

Specifications

Frequently Asked Questions

What makes 6-lobe hex screws better than slotted screws for scope mounting?

The 6-lobe head geometry provides a larger contact surface and deeper engagement with the driver bit, which dramatically reduces the risk of cam-out—stripping either the screw head or your bit. This is especially important when working with precision optics and expensive firearms where fastener failure can mean lost zero or costly damage.

Will these screws work with my standard gunsmithing tools?

Yes. The 6-lobe hex head design is compatible with all standard 6-lobe hex drivers and bits. If you already have a 6-lobe screwdriver or bit set, you're ready to use these fasteners right out of the box.

What are the tweezers and shortening jig for?

The tweezers help you handle small fasteners safely and precisely when working in confined spaces like scope base mounting. The thread size gauge and shortening jig let you measure and trim screws to the exact length your particular job requires, eliminating the guesswork of finding the right length fastener.

Is this kit suitable for AR-15 and modern rifle builds?

This kit covers the thread sizes and head styles commonly used in scope mounting and base assembly across modern rifles. The variety of configurations means you'll have the right fastener for most standard gunsmithing and rifle assembly tasks.