Extension Spring, Ultra Precision, 302 Stainless Steel, Plain, End Type Full Twist Loops, Overall Length 4 In, Outside Dia 0.360 In, Wire Dia 0.055 In, Load 15.29 Lbs, Deflection @ Load 2.10 In, Initial Tension 1.39 Lbs, Spring Rate 6.69 Lbs/In, Meets/Exceeds ASTM A313 and AMS 5688, Package 3