A10-1 REVISED OCTOBER, 2012 © Copyright 2023. All rights reserved. No portion may be copied or reproduced in any manner. SOSMETAL PRODUCTS INC. FASTENERS & HARDWARE A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 HEX HEAD CAP SCREWS THREADS PER INCH TECHNICAL DATA HEX HEAD MARKING AISI, ASTM MATERIAL PHYSICAL PROPERTIES MARKING SPECIFICATION OR SAE No. TYPE AND GRADE FOR PROOF LOAD TENSILE ROCKWELL FASTENER DIA. (PSI) STRENGTH HARDNESS INCHES (MIN. PSI) No Marking C-1010 Low Carbon 1/4 thru 1-1/2 33,000 60,000 B-100 max. GRADE 1 C-1020 Steel No Marking C-1018 Low Carbon 1/4 thru 3/4 55,000 74,000 B-100 max. GRADE 2 C-1020 Steel 7/8 thru 1-1/2 33,000 60,000 3 Radial Lines C-1038 Medium 1/4 thru 1 85,000 120,000 C25-34 GRADE 5 Carbon Steel over 1 to 1-1/2 74,000 105,000 C19-30 Quenched & Tempered (Heat Treated) 6 Radial Lines 8735 Medium Up to 1-1/2 120,000 150,000 C33-39 GRADE 8 8740 Carbon Alloy Steel, Quenched & Tempered 9 Radial Lines SPECIAL Special Carbon Up to 1 145,000 180,000 C38-42 Exceeds Gr.-8 Alloy Steel to Exceeds Specifications Quenched & 200,000 GRADE 8 Ultra Alloy Tempered TENSILE STRENGTH MATERIAL HEAD PLATING ILLUSTRATION 180,000 PSI Special carbon 23% higher Yellow zinc Alloy steel Head for Plating provides For maximum Greater Effective Strength Wrenching Resistance to Corrosion 150,000 PSI Medium Standard Yellow zinc Carbon alloy Plating provides Steel Effective Resistance to Corrosion 120,000 PSI Medium Standard Lusterplated Carbon To resist rust Steel And corrosion DIAMETER 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 USS 20 18 16 14 13 12 11 10 9 8 SAE 28 24 24 20 20 18 18 16 14 14 The formula for determining basic thread length on cap screws is as follows: a. For bolts or screws 6 in. and shorter - twice the diameter plus 1/4 inch. b. For bolts or screws over 6 inches long - twice the diameter plus 1/2 inch. c. When bolts or screws are too short to apply the formula the thread will be extended as close to the head as possible. USS coarse SAE fine
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