Compression Spring, Conical, 302 Stainless Steel, Finish Plain, Overall Length 1/2 In, Wire Type Round, Wire Dia 0.040 In, End Type Squared and Not Ground, Large Outside Dia 0.600 In, Small Outside Dia. 0.250 In, LD @ 50% FREE LENGTH 4.07 Lbs, LOAD @ SOLID 6.83 Lbs, Spring Rate 16.28 Lbs/In, Meets/Exceeds ASTM A313