Extension Spring Ultra Precision 302 Stainless Steel Plain End Type Full Twist Loops Overall Length 1 In Outside Dia 0.240 In Wire Dia 0.029 In Load 3.91 Lbs Deflection @ Load 0.74 In Initial Tension 0.35 Lbs Spring Rate 4.78 Lbs/In Meets/Exceeds ASTM A313 and AMS 5688 Package 3