Extension Spring Utility Standard Steel Oil End Type Machine Half Loop Overall Length 9-45/64 in Outside Dia 1.130 in Wire Dia 0.150 in Fabric Sleeve Outside Dia 1.29 in Load (Lbs.) 35.50 Deflection @ Load 1.00 in Spring Rate (Lbs./in) 13.5 Meets/Exceeds ASTM A227/A228 and AMS 5112