Grade 5 Hex Head Cap Screws - (SAE) Fine Thread
Zinc plated Grade 5 hex head cap screws in SAE fine thread: 1/4-28, 5/16-24, 3/8-24, 7/16-20 and 1/2-20, from 3/4" to 3" long. Fine thread is common on cars, trucks and machinery. Choose a size below.
Specifications
- Grade: SAE J429 Grade 5, 3 radial lines on the head
- Strength: 120,000 psi min. tensile
- Thread: SAE fine (UNF)
- Sizes: 1/4-28, 5/16-24, 3/8-24, 7/16-20, 1/2-20
- 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
- Automotive and truck repair
- Machinery and equipment
- Assemblies that need fine adjustment
FAQ
What do USS coarse and SAE fine thread mean?
USS (UNC) coarse thread has fewer threads per inch and is the general purpose standard; it assembles fast and is less likely to cross thread. SAE (UNF) fine thread has more threads per inch, which gives a little more strength and finer adjustment, and is common on vehicles and machinery. The nut must match the thread.
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.
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 Coarse Thread | Grade 8 Fine Thread | Grade 5 Hex Nuts | SAE Flat Washers
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