ASTM A193 / A194 · MS / HT / SS Grades
Fasteners & Studs
Complete range of bolts, studs, nuts and washers for industrial piping, pressure vessels, flanges and structural applications. ASTM A193 B7 stud bolts available M6 to M180 (1/4" to 7" diameter).
Grades & Specifications
ASTM A193 Grade B7
Chromium-molybdenum (AISI 4140) alloy steel stud bolts. Min. tensile 125 ksi, yield 105 ksi. Most common for carbon steel flanges. M6 to M180, 1/4" to 7".
ASTM A193 Grade L7
Low-alloy steel for low-temperature service. Used in cryogenic applications, LNG, cold-service pipelines.
ASTM A193 Grade B8 / B8M
Stainless steel stud bolts — B8 (SS 304), B8M (SS 316). For corrosion-resistant applications.
ASTM A194 Grade 2H
Heavy hex nuts for A193 B7 stud bolts. Standard nut pairing for carbon steel piping.
ASTM A194 Grade 7
Heavy hex nuts for A193 L7 stud bolts. Low-temperature service.
ASTM A194 Grade 8 / 8M
Stainless steel nuts for A193 B8/B8M studs — Gr. 8 (SS 304), Gr. 8M (SS 316).
Mild Steel Gr. 4.6 / 5.6
Hex head bolts, nuts & washers for general structural and low-pressure piping applications.
High Tensile Gr. 8.8
Medium carbon steel, quenched and tempered. General engineering and structural use.
High Tensile Gr. 10.9 / 12.9
Alloy steel, high tensile for structural steel connections, machinery and heavy equipment.
SS 304 / 316 / 317 / 321 / 904L
Stainless steel hex bolts, nuts and washers for corrosion-resistant applications.
Fastener Types Available
Surface Coatings
PTFE / Xylan Coated
Superior corrosion resistance, low friction. Used in high-alloy applications.
Zinc Plated (Electroplated)
Cost-effective corrosion protection for mild steel fasteners.
Hot Dip Galvanized (HDG)
Thick zinc coating for outdoor, marine and structural applications.
Black Phosphate
Moderate corrosion resistance with lubricating properties. Common for high-tensile grades.
Cadmium Plated
Excellent corrosion resistance, often used in aerospace and marine industries.