Each pressure spring for Stearns SABs is color-coded to indicate the torque rating of the brake for example:
56,000 series - green spring is for 1.5 and 3 lb-ft brakes, clear coated (silver) spring is for 6 and 10 lb-ft brakes and the gold spring is for 15, 20 and 25 lb-ft brakes.
87,000 series - Black spring is for 6 and 10 lb-ft brakes, white spring is for 15 lb-ft brakes orange is for 25 and 50 lb-ft brakes and purple is for 35, 75 and 105 lb-ft brakes.
82,000 series brakes green spring is for 125 lb-ft brakes, yellow springs are for 175 and 230 lb-ft brakes and the red spring is for 330 and 440 lb-ft brakes.
All 86,000 series brakes have red springs (500 lb-ft, 750 lb-ft and 1000 lb-ft).