timber bolts have fins on the neck underneath the head to prevent the bolt from turning during installation

8 x 2 Simpson Mod Truss-Head Self-Drilling Wire Lath Screws - Phillips Drive 410 SS - Carton (1000)

1/2-13 x 6 1/2 Hex Cap Screw SS 316 (A4)

1 7/8-8 A194 2H Heavy Hex Nut Plain

Special flute design improves penetration without blowback or compacting

3/4-10 x 2 3/4 A325 Type 1 Heavy Hex Bolt Plain (100) A194 2H Heavy Hex Nuts Hot Dipped Galvanized timber bolts have fins on3 4 10 x 2 3 4 A325 Type 1 Heavy Hex Bolt Plain (100) . Heavy Hex A325 structural bolts are designed for steel to steel structural connections. For this reason, they are typically very short. The A325 and A490 specifications are not intended for general applications, including anchor bolts. Free certs available on request.