Carbon steel stainless 410 stinleSS Adams Industries Inc 3 Bradley International Airport PO Box 291 head marking Torx Products Camcar Division Of Textron Inc Formerly:Indiana Metal For hex head (inch and metric) CONNECTING ROD BOLTS aALL STUDS (THREADED END SHOWN) head delta in indent (bp ot nut) 07 0 FASTENER REFERENCE GUIDEMarking Min. Max. 4.6 Low or medium carbon steel M1.6 - M39 225 240 400 (58,000 PSI) B67 B95 8.8 Medium carbon steel:quenched & tempered M1.6 - M16 580 640 800 (116,000 PSI) C22 C32 M18 - M39 600 660 830 (120,000 PSI) C23 C34 10.9 Alloy steel:quenched & tempered M1.6 - M39 830 940 1040 (150,800 PSI) C32 C39 12.9 Alloy steel:quenched & tempered
Bolts, Screws, Studs Low or Medium Carbon Steel 1/4 thru 1-1/2 33,000 60,000 ASTM A307Grades A&B Low Carbon Steel 1/4 thru 4 SAE J429Grade 2 Low or Medium Carbon Steel 1/4 thru 3/4 Over 3/4 to 1-1/2 55,000 33,000 57,000 36,000 74,000 60,000 No Grade Mark SAE J429Grade 4 Studs Medium Carbon Cold Drawn Steel 1/4 thru 1-1/2 100,000 Hex Bolt Identification, Markings and Strength Chart Table Hex Bolt Identification, Markings and Strength Chart. Additonal information on bolts is located at the bottom of the webpage. Note:Some bolts share identical head identification and have significantly different strengths. Hex Head Bolt Markings - cousesteelThe strength and type of steel used in a bolt is supposed to be indicated by a raised mark on the head of the bolt. The type of mark depends on the standard to which the bolt was manufactured. Most often, bolts used in machinery are made to SAE standard J429, and bolts used in structures are made to various ASTM standards.
Other types of bolts and screws can be marked in the same way, where it is possible to do so and on the head portion only. Additional marking is allowed, provided it does not cause confusion. Fasteners that do not fulfil the tensile or torsional requirements because of the geometry may be marked with the steel grade, but shall not be marked Metric Bolt Grade Markings and Steel Strength Chart Nov 05, 2019 · Head Markings Metric Bolt Class Mechanical Properties Proof Load (MPa) Min Yield (MPa) Min Tensile Strength (MPa) Class 8.8 Medium carbon steel, quenched and tempered 580-600 640-660 800-830 Class 10.9 Alloy Steel, quenched and tempered 830 940 1040 Class 12.9 Alloy Steel, quenched and tempered 970 1100 1220 A2 Stainless Also called 18-8 or type 304 stainless steel* N/A 210 Min. 450 Typical 500 Min. 700 Typical Proof Load:An axial tensile load Stainless steel hex cap screw markings Fasteners, bolts Inch 18-8 , which can be 302, 303 or 304 stainless, refers to 18% chromium and 8% nickel content. 316 is more corrosion resistant than 18-8 because it contains molybdenum, but in inch fasteners both have the same tensile strength. Metric A2 refers to metric 18-8. A4 refers to metric 316. Class 50, 70 
dard fasteners has a head of 0.01 inch (.254mm) in diameter; the largest has a head of 4 feet (1.219m). Specification for Stainless Steel Bolts, Hex Cap Screws and Studs) covers the The markings for stainless steel fas-teners are defined in ASTM Specification A193/193M. The grades of stainlessFastener Head Markings Decoded - Portland BoltDec 04, 2007 · Examples of head markings for 300 series stainless are ASTM A193/A320 B8 (304) or B8M (316) which are marked B8/B8M respectively. There is also ASTM F593 which has many several head markings that all indicate 300 series stainless. Details can be found on our F593 page https://portlandbolt/technical/specifications/astm-f593/.