Extension Spring, Ultra Precision, High Carbon Steel, Plain, End Type Full Twist Loops, Overall Length 1 1/2 In, Outside Dia 0.180 In, Wire Dia 0.018 In, Load 1.55 Lbs, Deflection @ Load 2.56 In, Initial Tension 0.14 Lbs, Spring Rate 0.5 Lbs/In, Meets/Exceeds ASTM A228 and AMS 5112, Package 3