Extension Spring Ultra Precision 302 Stainless Steel Plain End Type Full Twist Loops Overall Length 5/8 In Outside Dia 0.180 In Wire Dia 0.022 In Load 2.26 Lbs Deflection @ Load 0.39 In Initial Tension 0.17 Lbs Spring Rate 5.47 Lbs/In Meets/Exceeds ASTM A313 and AMS 5688 Package 3