Extension Spring Ultra Precision 302 Stainless Steel Plain End Type Full Twist Loops Overall Length 2 3/4 In Outside Dia 0.360 In Wire Dia 0.045 In Load 8.86 Lbs Deflection @ Load 2.27 In Initial Tension 0.78 Lbs Spring Rate 3.56 Lbs/In Meets/Exceeds ASTM A313 and AMS 5688 Package 3