Heavy Duty Aluminum Alloy Truck Axle Shims Width - 3.5"  |  Degree - 2.0°  |  Length - 6.25" These economical over-the-road heavy duty truck axle shims are our lowest cost option. With average compression strength and hardness these shims are available in a large variety of sizes and offer the technician a cost effective means to correct caster on over-the-road trucks and trailers. Note: Ordering one Part Number supplies six shims in a box. When placing order spring pad length and width is needed. On all shims - if you are using "Z Blocks" or other axle spacers you need to spread the load to prevent the shim from crushing. Check out SPC'D Axle Spacer Plate below to solve this common problem. 3" Wide - #10598 |  3.5" Wide - #10698 |  4" Wide - #10798 Maganese Bronze Alloy Shim #10634 |  Zinc Alloy Shim #10633 Specialty Products carries Truck Axle Caster Shims in three different alloys, giving the technician the opportunity to match price point and mechanical requirements to meet their customer'eeds.