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Systems of Bolt Grades
Bolts are made of different grades of steel. The bolt grade determines the maximum amount of stress the bolt can handle. Tensile strength is the amount of pull the bolt can withstand before breaking. The method used for tightening the bolt is dependent upon the bolt grade. The grades are indicated on top of the bolts. They show up as raised numbers or dashes. There are three main systems of bolt classification: SAE, Metric and ASTM.
SAE Bolt Grades: The standards for bolt strength grades in the U.S. They are set according to a system developed by the SAE. SAE stands for Society of Automotive Engineers. The SAE marking system uses raised dashes on the bolt head. The dashes are used to indicate strength.
Metric Bolt Grades: Set according to rules set by the ISO. ISO stand for International Standards Organization. The grades consist of two numbers separated by a dot. The property class is expressed in raised or depressed numerals. The numerals are on top or on the side of the bolt head.
ASTM Bolt Grades: Set by the American Society for Testing and Materials. Its strength grades are indicated by the letter A. There are also three numerals stamped on the bolt head.
Bolt Grade Numbers
The most common grading system used for bolts in the U.S. is the SAE system, but you can find metric grading systems as well. There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength. No matter the system used, the higher number means the stronger the bolt. For most home and automotive applications, you won't need anything more than a grade 8 bolt strength or metric class 10.9.
Important metrics to understand:
- Yield Strength: The maximum load at which a material exhibits a specific permanent deformation.
- Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.
Standard: | ANSI/ASME B 18.31.2,DIN975/DIN976 | |||
Diameter: | 1/4"-5",M6-M125 | 1/4"-5",M6-M125 | ||
Length: | ≤9m or 30feet | |||
Material: | Carbon Steel, Alloy Steel, Stainless Steel, Brass | |||
Grade: | Class 4.8, 5.8, 6.8, 8.8, 10.9, 12.9 ASTM A193 / ASTM A193M Grade B5 (AISI 501) ASTM A193 / ASTM A193M Grade B6, B6X (AISI 410) ASTM A193 / ASTM A193M Grade B7, B7M (AISI 4140, AISI 4142, AISI 4145, AISI 4140H, AISI 4142H, AISI 4145H ASTM A193 / ASTM A193M Grade L7,L7M,L43 ASTM A193 / ASTM A193M Grade B16 ASTM A193 /A193M, ASTM A320 /A320M Grade B8, B8A (AISI 304, AISI 304L, AISI 304H) ASTM A193 /A193M, ASTM A320 /A320M Grade B8C, B8CA (AISI 347, AISI 347H) ASTM A193 /A193M, ASTM A320 /A320M Grade B8M, B8MA, B8M2, B8M3 (AISI 316, AISI 316L, AISI 316H) ASTM A193 /A193M, ASTM A320 /A320M Grade B8P, B8PA (AISI 305) ASTM A193 /A193M, ASTM A320 /A320M Grade B8N, B8NA (AISI 304N) ASTM A193 /A193M, ASTM A320 /A320M Grade B8MN, B8MNA (AISI 316N) ASTM A193 /A193M, ASTM A320 /A320M Grade B8MLCuN, B8MLCuNA ASTM A193 /A193M, ASTM A320 /A320M Grade B8T, B8TA (AISI 321, AISI 321H) ASTM A193 /A193M, ASTM A320 /A320M Grade B8A, B8RA ASTM A193 /A193M, ASTM A320 /A320M Grade B8S, B8SA ASTM A193 /A193M, ASTM A320 /A320M Grade B8LN, B8LNA (AISI 304N, AISI 304LN) ASTM A193 /A193M, ASTM A320 /A320M Grade B8MLN, B8MLNA (AISI 316N, AISI 316LN) | |||
Thread: | M,UNC,UNF,UNS,UNR | |||
Finish: | Plain, Zinc Plated(Clear/Blue/Yellow/Black), H.D.G, PTFE,Zinc Nickel,Geomet,Dacromet,Zinteck,Magni | |||
Packing: | Bulk in cartons (25kg Max.)+wood Pallet,woven bag then pallet, according to customer special demand | |||
Application: | Oil&Gas; Structural Steel; Metal Building; Tower&Pole; Wind Energy; Mechanical Machine; Home Decorating | |||
Equipment: | Caliper, Go&No-go gauge, Tensile test machine, Hardness tester, Salt spraying tester, H.D.G thickness tester, 3D detector, Projector, Magnetic flaw detecter, Spectrometer | |||
Supply Ability: | 1000 tons per month | |||
MOQ: | According to customer demand | |||
Trade Term: | FOB/CIF/CFR/CNF/EXW/DDU/DDP | |||
Payment: | T/T, L/C, D/A , D/P ,West Union,Paypal.etc | |||
Market: | Europe/South&north America/East&South East Asia/Middle East/Australia and etc. | |||
Professional: | More than 15 years of experience in the fasteners industry Our Main market is North&South America and proficient in DIN/ASME/ASTM/IFI standard. | |||
Our advantage: | One-stop shopping; High quality; Competitive price; Timely delivery; Technical support; Supply Material and Test Reports; Samples for free | |||
Notice: | Please let's know the Size, quantity, Material or Grade, surface, If it is special and Non-standard products, please supply the Drawing or Photos or Samples to us | |||
