Carriage Screws - Carriage Bolts

18-8 Stainless Steel

316 Stainless Steel

Grade 5 Zinc Plated Steel

Silicone Bronze

Grade 2 Galvanized

Grade 2 Zinc Plated Steel

Class 8.8 Zinc Yellow Chromate Plated

Class 8.8 Zinc Plated

Type 316 Stainless Steel Carriage Screws:

Better corrosion resistance than Type 304. Low carbon chromium-nickel stainless with good weldability and temperature resistance. Max. temp. to maintain corrosion resistance is 1600 degrees F.

This austenitic stainless steel has an increased molybdenum content to increase its resistance to corrosion when compared to other 300 series alloys. 

316 is recommended for any application exposed to saltwater (including immersion).

18-8 Stainless Steel Carriage Screws:

Corrosion-resistant, slightly magnetic.

Grade 5 Zinc-Plated Steel Carriage Screws:

Rust Resistant. SAE J429.

Grade 2 Zinc-Plated Steel Carriage Screws:

Full Threads. Made of Grade 2 zinc-plated steel.

Grade 2 Hot-Dipped Galvanized Steel Carriage Screws:
Silicon Bronze Carriage Screws:

Nonmagnetic, corrosion resistance from salt water.