EXTENSION SPRING, ULTRA PRECISION, HIGH CARBON STEEL, PLAIN, END TYPE FULL TWIST LOOPS, OVERALL LENGTH 1 3/8 IN, OUTSIDE DIA 0.360 IN, WIRE DIA 0.055 IN, LOAD 17.60 LBS, DEFLECTION @ LOAD 0.50 IN, INITIAL TENSION 1.60 LBS, SPRING RATE 32.1 LBS/IN, MEETS/EXCEEDS ASTM A228 AND AMS 5112, PACKAGE 3