Product Info Catalog Hardware Builders Hardware Springs Extension Spring, 1-1/8-In. OD x 8-1/2-In. Extension Spring, 1-1/8-In. OD x 8-1/2-In. Request a Quote UPC: 38594002735 SKU: 681585 Model Number: C-273 1-1/8" OD, Extension Spring, 8-1/2" Length, .148" Wire Diameter, 3.87" Maximum Deflection, 81.1 LB Maximum Safe Load, Bulk With UPC.