Stainless Hex Head Cap Screws (USS) Coarse Thread

18-8 stainless steel hex head cap screws (hex bolts) in USS coarse (UNC) thread, from 1/4-20 to 1"-8, in lengths from 3/8" to 12". They are the standard stainless bolt for outdoor, marine and washdown use. Choose a size below.

Stainless Hex Head Cap Screws (USS) Coarse Thread | The Nutty Company, Inc.

Specifications

Material: 18-8 stainless steel
Thread: USS coarse (UNC)
Sizes: 1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13, 9/16-12, 5/8-11, 3/4-10, 7/8-9, 1"-8
Lengths: 3/8" to 12"
Short lengths fully threaded, longer lengths partially threaded

Common Uses

Marine and dock hardware
Outdoor structures and equipment
Food and process machinery
Water treatment

FAQ

Hex cap screw or hex bolt?
The names are used for the same part. A hex head cap screw has a washer face under the head, a chamfered point and closer tolerances, so it fits nuts and tapped holes.

How strong are 18-8 stainless bolts?
18-8 stainless bolts to ASTM F593 have a minimum tensile strength of about 100,000 psi in 1/4" to 5/8" and about 85,000 psi in 3/4" to 1-1/2". That is stronger than Grade 2 steel but not as strong as Grade 5 or Grade 8.

How do I stop stainless threads from galling?
Stainless threads can seize (gall) when tightened fast or under heavy load. Put anti-seize on the threads, tighten slowly at low speed, keep the threads clean and don't overtighten.

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