Front wheel bearings should be adjusted to 12 ft lbs, backed off to "just loose", tightened by hand grip alone, then backed off to align the cotter pin. Bridgestones are thought by some to ride harder, but they tighten up the steering and stability, and don't have the sidewall failures of the "M" brand. Federal Supply Classification FSC includes all 3920 Material Handling Equipment Nonself-Propelled items such as 31-481-31, 20000810026-012, T-9032879, 101025620000, 132-BB-1399 made by various manufacturers such as Plymouth Industries Inc, Hi Shear Corporation, Boeing Company, Arpa Support Services Inc, Plastiglide Mfg Corp. PLASTIGLIDE.COM - Industrial Casters Wheels, Furniture ... automotive wheel div cad982436412 nichols institute reference laboratory cad073593832 nordskog electric vehicles cad097030993 morris industries inc cad048456941 north american chemical company cad068880657 north american packaging corp. cad982010258 north bay ford l inc merc cad094973195 northern telecom, inc. Plastiglide Conductive Wheels. Proprietary non-marking conductive (anti-static) rubber compound mixed and manufactured in the USA. Combines the mechanical properties of rubber (load capacity, durability, quiet roll) with enhancements to the compound chemistry to produce high electrical conductivity.