Compression Spring, Conical, 302 Stainless Steel, Finish Plain, Overall Length 1/2 In, Wire Type Round, Wire Dia 0.063 In, End Type Squared and Not Ground, Large Outside Dia 0.850 In, Small Outside Dia. 0.375 In, LD @ 50% FREE LENGTH 11.09 Lbs, LOAD @ SOLID 16.60 Lbs, Spring Rate 44.33 Lbs/In, Meets/Exceeds ASTM A313