Nut Material:  

Medium Carbon Steel (usually SAE 1045)

Bolt Material:

Medium Carbon Steel with Heat treatment (SAE 1038 or 1040)

Mechanical Properties  

(ASTM A-449) Type 1:

Bolt Hardness: 25-34 Hrc

Tensile Strength: 120,000 psi min

Proof Load: 40,100 lbs

Finished:

Hot Dip Zinc Coating (ASTM A-153 class C).
The nut have to tap oversize (0.020") after Hot dip process

Marking:

3 radial lines 120º apart

Bolt Thread:

Cut or Rolled thread

Special Products: 

We manufacture bolt and nuts with special design or material