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STANDARD BOLT IDENTIFICATION MARKINGS. Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) Low‐ or Medium‐ Carbon Steel 1/4 THRU 1 ½ 33,000 36,000 Low‐Carbon Steel 1⁄4 thru 4 −− −− SAE J429 Grade 2 Low‐ or Medium‐ Carbon Steel 1⁄4 thru 3⁄4 Over 3⁄4 thru 1 ½ 55,000 33,000 57,000 36,000 74,000 60,000 ...
Learn how to identify hex bolts by grade, mark, specification, description, material and strength. Compare different types of bolts with the strength chart table guide.
Learn how to identify the grades of bolts using the marks on the bolt head and the material, size, strength and hardness of common bolt specifications. See the chart for inch steel bolts with SAE and ASTM standards.
Bolt grades are alphanumeric designations that categorize bolts based on their mechanical properties. They determine the maximum amount of load the bolt can handle as well as the method that can be used for tightening the bolt. In general, the higher the grade number, the stronger the bolt.
Metric Bolts: Head Marking Class and Material Nominal Size Range (mm) Mechanical Properties ; Proof Load (MPa) Min. Yield Strength (MPa) Min. Tensile Strength (MPa) Class 8.8 Medium carbon steel, quenched and tempered All sizes below 16mm: 580: 640. 800. 16mm - 72mm : 600: 660: 830: Class 10.9 Alloy steel, quenched and tempered
Identification Marking Compatible ASTM A194/A194M Heavy Hex Nut ASTM A193/A193M B7 2 1/2 & under 125,000 105,000 C35 Chromium-molybdenum alloy (4140, 4142, 4145, 4140H, 4142H, 4145H) used for high-pressure, high-temperature applications. Over 2 1/2 - 4 115,000 95,000 C35 Over 4 – 7 100,000 75,000 C35 ASTM A193/A193M B7M
General. Fasteners are identified by four or five attributes; Type, Material , Diameter, Length , and Thread Pitch or Count (machine thread fasteners only). This page describes what these attributes represent. Information on how they are written can be found on our How Fastener Measurements Are Notated page.
