Extension Spring Ultra Precision 302 Stainless Steel Plain End Type Full Twist Loops Overall Length 1 1/2 In Outside Dia 0.300 In Wire Dia 0.055 In Load 18.52 Lbs Deflection @ Load 0.40 In Initial Tension 1.67 Lbs Spring Rate 41.63 Lbs/In Meets/Exceeds ASTM A313 and AMS 5688 Package 3