Square neck of the round head carriage bolt makes the bolt self-locking during tightening, when mated with a square hole. Offered in a variety of sizes. Commonly referred to as a coach bolt.

Quan Pham brand of pole line construction fasteners consist of machine and carriage bolts, flat, curved square and round washers, lock washers, washer nuts, locknuts, staples and lag screws. All products are designed and manufactured per applicable electric utility and communications industry standards.

  • 3″ thread length
  • Includes one square nut
  • Rated tensile strength is 1,800 lbs.
  • Galvanized per CSA G164-M
  • Manufactured in compliance with Canadian CSA C83-96 specification and Charpy level 1 impact properties with average minimum energy absorption of 20 joules when tested at -20 degrees C per ASTM A370


Coating Galvanized, CSA G164-M
Material Steel
Tensile Strength 5200 lb.
UPC 096359573449


Diameter 0.38 in
Diameter (Fraction) 3/8 in
Length 4.50 in
Length – Threaded Area 3

Certifications and Compliance

Industry Standard(s) CSA C83.66


Carton Quantity 250 EA
Pallet Quantity 12800