Square Pad Mount Compare Item # Compression Static Load Shear Static Load Shear - Spring Rate KS A B C D Thread Size E F J-5130-1 4130 lbs 18371 N 550 lbs 2447 N 2000 lbs/in 350 N/mm 4.75 in 4.75 in 2.62 in 2.12 in 1/2-20 UNC 5.12 in 0.53 in 13.5 mm J-5130-55 3400 lbs 15124 N 450 lbs 2002 N 1800 lbs/in 315 N/mm 4.75 in 4.75 in 2.62 in 2.12 in 1/2-20 UNC 5.12 in 0.53 in 13.5 mm