Extension Spring Ultra Precision High Carbon Steel Plain End Type Full Twist Loops Overall Length 5/8 In Outside Dia 0.180 In Wire Dia 0.022 In Load 2.60 Lbs Deflection @ Load 0.39 In Initial Tension 0.20 Lbs Spring Rate 6.3 Lbs/In Meets/Exceeds ASTM A228 and AMS 5112 Package 3