Extension Spring, Ultra Precision, 302 Stainless Steel, Plain, End Type Full Twist Loops, Overall Length 5/8 In, Outside Dia 0.180 In, Wire Dia 0.018 In, Load 1.35 Lbs, Deflection @ Load 0.63 In, Initial Tension 0.12 Lbs, Spring Rate 1.91 Lbs/In, Meets/Exceeds ASTM A313 and AMS 5688, Package 3