All Studbolts are manufactured in accordance with the relevant American and British Petrochemical and Gas Standards as indicated below. Studbolts are produced on the latest continuous thru-rolling principle to ensure greater uniformity of thread form and accuracy of thread pitch.

Production of bar by thread rolling in this manner is also much faster and produces no waste material. This means that manufacturing costs are lower and enables prices to remain competitive.

NACE Standards MR-01-75 This standard covers metallic material requirements for the resistance to Sulphide Stress Cracking (SSC) in equipment to be used on H2S Hydrocarbon Service GRADE OF BOLTING &MARKING SYMBOL B7 L7 Recommended Bolting Temperature Range Min - 460C Max-4000C Min - 1000C Max - 4000C BS Material Specification BS 1506-612A BS 1506-621A BS1510-LT100 Equivalent American Specification ASTM. A193 Grade B7 ASTM. A320 Grade L7 Chemical Analysis B7 L7 Carbon % 0.38 0.38 0.48 0.48 Silcon % 0.20 0.20 0.35 0.35 Manganese % 0.75 0.75 1.00 1.00 Chromium % 0.80 0.80 1.10 1.10 Molybdenum % 0.15 0.15 0.30 0.30 Sulphur % % 0.040 MAX 0.040 MAX Phosphorus 0.040 MAX 0.040 MAX   Mechanical Properties B7 L7 Limiting Ruling Section 2" 4" 2" 4" Brinell Harness Min Max 248 335 223 310 248 335 223 310 Minimum Tensile Strength N/mm2 Ton f/in2 860 56 790 51 860 56 790 51 Minimum Yield Strength  0.02% Proof Stress N/mm2 Ton f/in2 730 47 660 43 730 47 660 43 Minimum Elongation % 14 14 Minimum Izod Impact Value J ft.ibf. 54 40 54 40 Charpy V-Notch Low Temp Impact Value at-1000C. J ft.ibf 20 15