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UNC Bolts, Nuts and Washers

The UNC (Unified Coarse) threads are part of the Unified Thread Standard (UTS), most commonly employed throughout the United States and Canada. The threaded products on this page utilise this coarse pitch UNC standard. The washers available on this page are all designed to be used with inch based fasteners.
Material Key
A2 Stainless Steel - also known as grade 304 or 18/8. A general purpose grade of stainless steel.
A4 Stainless Steel - also known as grade 316 or 18/8/3. A higher corrosion resistant, marine grade of stainless steel.
Bright Zinc Plated (BZP) Steel - non-stainless standard steel grade offering a basic level of corrosion resistance.
Bright Zinc Plated (BZP) USA grade 5 high tensile steel - equivalent to UK class 8, a general purpose non-stainless grade with a basic level of corrosion resistance.
Through (Thru) Hardened Bright Zinc Plated Steel - carburised or through hardened washer in Bright Zinc Plate finish that has been treated to improve strength
Mechanically Plated Zinc Steel - mechanically plated to help prevent hydrogen embrittlement
Zinc Flake coated steel - Coated with superior mechanically applied zinc lasting 480 hours in the salt spray test.