Product Info Catalog Hardware Builders Hardware Springs Extension Spring, 1-In. OD x 7-In. Extension Spring, 1-In. OD x 7-In. Request a Quote UPC: 38594002698 SKU: 681569 Model Number: C-269 1" OD, Extension Spring, 7" Length, .135" Wire Diameter, 2.93" Maximum Deflection, 69.9 LB Maximum Safe Load, Bulk With UPC.