304 Stainless tubing has a tensile strength of 73,200 psi. This is compared to 1020 mild steel at 63,000 psi and 4130 chrome moly at 106,000psi.
Most current sanctioning body specs require a 1.625” OD .095” wall mild steel which would have a rating of 35,700 lbs. We use a 1.75OD .120” wall 304 stainless tubing that has a load rating of 43,015lbs As you can see, our stainless tubing has a slightly higher rating than the typical mild steel product.
clamps and bungs
The TigerClamp and bung components are made from a 304 cast stainless material by an AMERICAN casting foundry.
We have tested the clamp collars to resist over 670 lb. Ft. of rotational torque. We have tested the pivot connection to resist over 250 lb. Ft. of torque.
In car bracketry is all 304 3/16” thick stainless. We use 1020 steel backing plates underneath the car to evenly distribute the load through the oem floorpans and pillars.
The ½-20 thread pivot bolts are rated at 180,000psi tensile strength, which would equal a direct load rating of 25,500 lbs.
The 3/8-24 clamp collar bolts are also rated at 180,000psi tensile strength, which would equal a direct load rating of 15,800 lbs. each.
The fasteners used to attach the bracketry to the vehicle are grade 8 or better, rated at least to 150,000psi, which would provide a direct load rating of approx. 11,600 lbs each.