STRENGTH VS WEIGHT
Traditional thinking believes that in building off-road bumpers must be made of heavy steel–and the more the better. Most bumpers are made of 3/16” hot rolled, A36 grade low carbon steel. Good stuff when used in the right place. In fact, we use it on our tire carriers and in certain key places on our Jeep bumpers. But if you’ve been around the off-road scene long, you come to learn that more is not always better. Fact is there’s a big downside to adding extra weight to your off-road rig. You want the protection of a solid bumper, but the extra weight robs power and may require heavier springs to keep the suspension working like it should. Wilco Off-Road bumpers save weight while increasing strength and durability.
WILCO OFF-ROAD MC2X FRONT BUMPER
Choosing the right material for the job pays off big in the weight loss game. Our front bumper is double the strength and half the weight of competitive off-road bumpers. How do we do it? We combine steel with aluminum–bonding and bolting a tough outer skin of 4130 chromoly steel to a core bumper structure built from 6061 T6 aluminum alloy. It’s called Metal Composite Technology.
Steel is Real. We use 4130 chromoly steel in areas that are likely to make contact with rocks on the trail. Our heat-treated steel resists dents and deformation with a yield strength of 75,000 psi.
WILCO OFF-ROAD MC2X REAR BUMPER
First, the outer wings employ thinner/lighter 8-gauge, A36 carbon sheet steel that is designed and shaped for increased strength and rigidity.
Our bumper mounting plates are laser cut, half-inch thick steel with additional lighting holes.
The center section is a 2-inch diameter steel tube with 1/8-inch wall thickness that ties the outer wings together, increase strength and reduce overall weight.
We use aluminum for the rear bumper step for a 70% reduction n weight over steel. Aluminum is the ideal material choice for this part of the bumper that’s designed to be out of harm’s way and is unlikely to contact rocks or other trail junk.
And here’s the cool part. By bonding and bolting steel to aluminum we achieve a 50 percent increase in strength while significantly reducing weight.
CHECK THE FACTS
THEM – Typical replacement bumpers are made from A36 steel that has a yield strength of 30,000 psi (the stress point in which the material permanently deforms or our case dents or bends)
WILCO – We use heat-treated, 4130 chromoly steel with a yield strength of 75,000 psi that is 2.5 times stronger than standard steel used by others.
WILCO – Our 6061 T6 aluminum alloy has a yield strength of 40,000 psi. Therefore our .125-inch thick aluminum delivers the same strength as .170-inch thick steel at half the weight.