1/4-28 Stainless Hex Head Cap Screws

1/4-28 hex head cap screws with SAE fine (UNF) thread, made from 18-8 stainless steel. We stock 1/2", 3/4", 1", 1-1/4", 1-1/2", 1-3/4", 2", 2-1/4", 2-1/2", 3" lengths. They take a 7/16" wrench. Short lengths are fully threaded and longer lengths partially threaded.

Hex Cap Stainless | The Nutty Company, Inc.

Specifications

Size: 1/4-28 (SAE fine)
Lengths: 1/2", 3/4", 1", 1-1/4", 1-1/2", 1-3/4", 2", 2-1/4", 2-1/2", 3"
Wrench size: 7/16"
Thread: SAE fine (UNF)
Material: 18-8 stainless steel

The length of a cap screw is measured from the under-head bearing surface to the extreme end of the screw.
(FT)=Full Thread | (PT)=Partial Thread
Thread Length on a 1/4-28 bolt is approx. 3/4"
Wrench Size = 7/16"

Common Uses

Outdoor and marine assemblies
Food and process equipment
Corrosive and washdown areas

FAQ

What nut fits a 1/4-28 stainless cap screw?
A 1/4-28 18-8 stainless hex nut, or a nylon insert lock nut where vibration is a concern, with a 1/4" stainless flat washer.

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.

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.

Free shipping on orders over $100, and orders placed before noon EST ship the same day. Purchase orders are accepted from government agencies, schools, hospitals, municipalities and companies with established credit with The Nutty Company, Inc.