Grade 5 Hex Head Cap Screws - (USS) Coarse Thread
Zinc plated Grade 5 hex head cap screws in USS coarse thread, from 1/4-20 to 1"-8 and 1/2" to 10" long. Grade 5 is medium carbon steel, quenched and tempered, and is the everyday choice for machinery, vehicles and equipment. Short lengths are fully threaded and longer lengths are partially threaded. Choose a size below.
Specifications
- Grade: SAE J429 Grade 5, 3 radial lines on the head
- Strength: 120,000 psi min. tensile, 92,000 psi min. yield (1/4" to 1")
- 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
- Finish: zinc plated
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
Stock Photos - to verify Thread Length, goto:
Common Uses
- Machinery and equipment assembly
- Truck, trailer and automotive repair
- Brackets, mounts and frames
- Maintenance and repair stock
FAQ
What is the difference between Grade 2, Grade 5 and Grade 8?
Grade 2 is low carbon steel with no head markings (74,000 psi minimum tensile in 1/4" to 3/4"). Grade 5 is medium carbon steel, heat treated, with 3 radial lines on the head (120,000 psi). Grade 8 is medium carbon alloy steel, heat treated, with 6 radial lines on the head (150,000 psi). Pair each grade with a nut of the same grade or higher.
Hex cap screw or hex bolt?
In practice the names are used for the same part. A hex head cap screw (finished hex bolt) has a washer face under the head, a chamfered point and tighter tolerances than a plain hex bolt, so it fits tapped holes as well as nuts.
Full thread or partial thread?
Short lengths are fully threaded (FT). Longer lengths are partially threaded (PT), with a smooth shank under the head. Thread length on a partially threaded bolt is about twice the diameter plus 1/4" for lengths up to 6", and twice the diameter plus 1/2" for longer lengths.
Related: Grade 5 Fine Thread | Grade 8 Coarse Thread | Grade 5 Hex Nuts | SAE Flat Washers | Split Lock Washers
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.