5/8" Adapter – 3/8" Bolt

This precision-machined 5/8" adapter threads into any standard 3/8" bolt (included) to convert it for use with modular 5/8" fixturing systems like ArcFlat. It’s designed to ensure accurate, repeatable positioning of stops, clamps, and brackets across your table. When paired with an O-Ring Nut, it holds firmly in place—making setup fast, consistent, and reliable. Black oxide coating adds corrosion resistance and durability for daily use in the shop. Highlights: Two per package Threads onto standard 3/8" bolts – includes one bolt Creates a precise 5/8" locating pin for modular tables Pairs with O-Ring Nut (sold separately) to lock fixturing in place Machined for accuracy and repeatability Black oxide coated for long-lasting performance Explore More: Visit the ArcFlat product page to see compatible clamps, layout blocks, and fastening hardware designed for modular fixturing.