'Shoulder Screw, Alloy Steel, Plain Finish, Head Style Knurled, System of Measurement Inch, Thread Size 1/4-20, Hex Socket Drive Type, Drive Size 5/32 In., Shoulder Dia. 5/16 In., Shoulder Length 3/8 In., Thread Length 7/16 In., Head Dia. 7/16 In., Head Height 7/32 In., Screw Head Height 0.209 to 0.219, Shoulder Length Tolerance +/-0.005 In., Screw Head Dia. 0.419 to 0.438, Min. Tensile Strength (PSI) 140, 000, Shear Strength (PSI) 84000, Class 3A, Rockwell Hardness 32 to 43 HRC'