Compression Spring, Conical, 302 Stainless Steel, Finish Plain, Overall Length 5/8 In, Wire Type Round, Wire Dia 0.063 In, End Type Squared and Not Ground, Large Outside Dia 0.850 In, Small Outside Dia. 0.312 In, LD @ 50% FREE LENGTH 12.22 Lbs, LOAD @ SOLID 19.51 Lbs, Spring Rate 39.07 Lbs/In, Meets/Exceeds ASTM A313