Extension Spring, Ultra Precision, High Carbon Steel, Plain, End Type Full Twist Loops, Overall Length 5/8 In, Outside Dia 0.180 In, Wire Dia 0.029 In, Load 5.82 Lbs, Deflection @ Load 0.20 In, Initial Tension 0.52 Lbs, Spring Rate 26.5 Lbs/In, Meets/Exceeds ASTM A228 and AMS 5112, Package 3