Extension Spring, Ultra Precision, High Carbon Steel, Plain, End Type Full Twist Loops, Overall Length 2 1/4 In, Outside Dia 0.300 In, Wire Dia 0.055 In, Load 21.31 Lbs, Deflection @ Load 0.70 In, Initial Tension 1.92 Lbs, Spring Rate 27.70 Lbs/In, Meets/Exceeds ASTM A228 and AMS 5112, Package 3