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Definition of the stainless-steel bolts

September 09,2022

T&Y hardware Stainless steel bolts refer to bolts made of stainless steel, including stainless steel SUS201 bolts, stainless steel SUS304 bolts, stainless steel SUS316 bolts, and stainless steel SUS316L bolts. We are China’s professional Stainless steel bolts manufacturer, supplier, company, wholesaler.

T&Y hardware stainless steel bolts grade

Performance grade of  T&Y hardware stainless steel bolts 8.8 refers to the material with a tensile strength limit of 800MPa and a yield limit of 640MPa.

The performance grades of T&Y hardware stainless steel bolts, studs and studs are jointly divided into 10 grades: from 3.6 to 12.9. The number before the decimal point represents 1 / 100 of the tensile strength limit of the material, and after the decimal point represents 10 times the ratio of the yield limit to the tensile strength limit of the material.

The T&Y hardware nuts have seven performance grades, ranging from 4 to 12. Numbers roughly indicate 1 / 100 of the minimum stress guarantee of the stainless-steel nut.

For uniform English thread, there are three kinds of external thread levels: 1A, 2A and 3A, and the internal thread has three grades: 1B, 2B and 3B, all are gap fit. The higher the level number, the tighter the coordination.

Class 1,1A and 1B, very loose tolerance rating for tolerance fit of inner and outer threads.

Class 2,2A and 2B are the most common thread tolerance classes specified in the British series of T&Y hardware mechanical stainless-steel fasteners.

Class 3,3A and 3B, spin to form the closest fit, suitable for the T&Y hardware stainless steel standard parts with tight tolerance, for the safety-critical design.

Metric thread, external thread has three thread grades: 4h, 6h and 6g, internal thread has three thread levels: 5H, 6H and 7H. Thread fit is best combined into H / g, H / h or G / h, for bolts, T&Y hardware stainless steel nuts and other refined fastener threads, 6H / 6g fit is recommended by the standard.

The T&Y hardware stainless steel product strength grade mark consists of two parts separated by “- -” the front symbol “-” in the symbol indicates the material, such as: A2, A4 and other signs “- -” after the strength, such as: A2-70 T&Y hardware carbon steel bolts: Strength grade mark code is given by “?” the two parts of numbers. Mark the code name in the “?” the meaning of the previous number section indicates the nominal tensile strength, such as the” 4 “of the 4.8 level of “4” indicates 1 / 100 of the nominal tensile strength of 400 N/MM2. Mark the code name in the “?” the meaning of the meaning of the number part after the point indicates the yield strength ratio, that is, the ratio of the nominal yield point or nominal yield strength to the nominal tensile strength. For example, the yield point of grade 4.8 product is 320 N/mm2.

Carbon steel: T&Y hardware bolt mechanical performance grade can be divided into: 3.6,4.6,4.8,5.6,5.8,6.8,8.8,9.8,10.9,12.9 a total of 10 performance grades.

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