Extension Spring Ultra Precision 302 Stainless Steel Plain End Type Full Twist Loops Overall Length 1 1/4 In Outside Dia 0.300 In Wire Dia 0.037 In Load 6.26 Lbs Deflection @ Load 0.85 In Initial Tension 0.56 Lbs Spring Rate 6.69 Lbs/In Meets/Exceeds ASTM A313 and AMS 5688 Package 3