Product Info Catalog Hardware Builders Hardware Springs Extension Spring, 1-In. OD x 8-1/2-In. Extension Spring, 1-In. OD x 8-1/2-In. Request a Quote UPC: 38594003374 SKU: 681791 Model Number: C-337 1" OD, Extension Spring, 8-1/2" Length, .120" Wire Diameter, 5.38" Maximum Deflection, 51.0 LB Maximum Safe Load, Bulk With UPC.