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This specification covers chemical and mechanical requirements for nine property classes of carbon and alloy steel externally threaded metric fasteners in nominal thread diameters M1.6 through M100 suited for use in general engineering applications. This specification does not cover dimensional requirements for fasteners of any property class. When referencing this specification for procurement purposes, it is mandatory that size, type, style, and any special dimensions of the product be additionally specified. In case of any conflict in requirements, the requirements of the individual product specification shall take precedence over those of this general specification. The purchaser may specify additional requirements which do not negate any of the provisions of this general specification or of the individual product specification. Such additional requirements, the acceptance of which are subject to negotiation with the supplier, must be included in the order information.
Property Class | Nominal Product Diameter, mm | Material and Treatment | Product Analysis Element (% by weight) | Tempering Temperature, °C | |||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | B | P | S | |||||
| Min | Max | Min | Min | Max | Max | Min | |||
| 4.6 | M5-M100 | low or medium carbon steel | … | 0.55 | … | … | 0.048 | 0.058 | … |
| 4.8 | M1.6-M16 | low or medium carbon steel, partially or fully annealed as required | … | 0.55 | … | … | 0.048 | 0.058 | … |
| 5.8 | M5-M24 | low or medium carbon steel,cold worked | 0.13 | 0.55 | … | … | 0.048 | 0.058A | … |
| 8.8 | M20-M80 | medium carbon steel, productis quenched and tempered B | 0.25 | 0.55 | … | … | 0.048 | o.058c | 425 |
| 8.8 | M20-M36 | low carbon martensite steel,productis quenched and temperedD | 0.15 | 0.40 | 0.74 | 0.0005 | 0.048 | 0.058 | 425 |
| 8.8.3 | M20-M36 | atmospheric corrosion resistant steel, productis quenched and tempered | … | … | … | see Table 2 | … | … | 425 |
| 9.8 | M1.6-M16 | medium carbon steel, productis quenched and tempered | 0.25 | 0.55 | … | … | 0.048 | 0.058 | 425 |
| 9.8 | M1.6-M16 | low carbon martensite steel,product is quenched and temperedD | 0.15 | 0.40 | 0.74 | 0.0005 | 0.048 | 0.058 | 425 |
| 10.9 | M5-M20 | medium carbon steel,product is quenched and temperedE,F | 0.25 | 0.55 | … | … | 0.048 | 0.058 | 425 |
| 10.9 | M5-M100 | medium carbon alloy steel, product is quenched and temperedE | 0.20 | 0.55 | … | … | 0.040 | 0.045 | 425 |
| 10.9 | M5-M36 | low carbon martensite steel, product is quenched and tempered E,F | 0.15 | 0.40 | 0.74 | 0.0005 | 0.048 | 0.058 | 340 |
| 10.9.3 | M16-M36 | atmospheric corrosion resistant steel,productis quenched and tempered E | … | … | … | see Table 2 | … | … | 425 |
| 12.9 | M1.6-M100 | alloy steel,productis quenched and temperedE,G | 0.31 | 0.65 | … | … | 0.045 | 0.045 | 380 |
Note:
A. For studs only, sulfur content may be 0.33 %, max.
B. At the manufacturer’s option, medium-carbon-alloy steel may be used for nominal thread diameters over M24.
C. For studs only, sulfur content may be 0.13 %, max.
D. Products made using this material shall be specially identified as specified in Section 15.
E. Steel for Classes 10.9, 10.9.3, and 12.9 products shall be fine grain and have a hardenability that will achieve a structure of approximately 90 % martensite at the center
of a transverse section one diameter from the threaded end of the product after oil quenching.
F. Carbon steel may be used at the option of the manufacturer for products of nominal thread diameters M12 and smaller. When approved by the purchaser, carbon steel
may be used for products of diameters larger than M12 through M20, inclusive.
G. Alloy steel shall be used. Steel is considered to be alloy by the American Iron and Steel Institute when the maximum of the range given for the content of alloying
elements exceeds one or more of the following limits: manganese, 1.65 %; silicon, 0.60 %; copper, 0.60 %; or in which a definite range or a definite minimum quantity of
any of the following elements is specified or required within the limits of the recognized field of constructional alloy steels: aluminum, chromium up to 3.99 %, cobalt,
columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium, or any other alloying elements added to obtain a desired alloying effect.
| Property Class | Nominal Diameter of Product | Full Size Bolts, Screws, and Studs | Machined Test Specimens of Bolts, Screws, and Studs | Surface Hardness | Product Hardness | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Proof LoadA | Tensile Strength, MPaA | Yield Strength, MPaB | Tensile Strength, MPa | Elongation, % | Reduction of Area, % | Rockwell 30N | Rockwell | Vickers | |||||
| Length Measurement Method, MPa | Yield Strength Method, MPa | Min | Min | Min | Min | Min | Max | Min | Max | Min | Max | ||
| 4.6 | MS-M100 | 225 | 240 | 400 | 240c | 400 | 22 | 35 | … | 867 | 895 | 120 | 220 |
| 4.8 | M1.6-M16 | 310 | 340 | 420 | 340 | 420 | 14 | 35 | … | B71 | 895 | 130 | 220 |
| 5.8 | M5-M24D | 380 | 420 | 520 | 420 | 520 | 10 | 35 | … | 882 | 895 | 160 | 220 |
| 8.8 | M20-M80 | 600 | 660 | 830 | 660 | 830 | 12 | 35 | 53 | C23 | C34 | 255 | 336 |
| 8.8.3 | M20-M36 | 600 | 660 | 830 | 660 | 830 | 12 | 35 | 53 | C23 | C34 | 255 | 336 |
| 9.8 | M1.6-M16 | 650 | 720 | 900 | 720 | 900 | 10 | 35 | 56 | C27 | C36 | 280 | 360 |
| 10.9 | MS-M100 | 830 | 940 | 1040 | 940 | 1040 | 9 | 35 | 59 | C33 | C39 | 327 | 382 |
| 10.9.3 | M16-M36 | 830 | 940 | 1040 | 940 | 1040 | 9 | 35 | 59 | C33 | C39 | 327 | 382 |
| 12.9E | M1.6-M100 | 970 | 1100 | 1220 | 1100 | 1220 | 8 | 35 | 63 | C38 | C44 | 372 | 434 |
Note :
A. Proof load and tensile strength values for full size products of each property class.
B. Yield strength is stress at which a permanent set of 0.2 % of gage length occurs.
C. Yield point shall apply instead of yield strength at 0.2 % offset for Class 4.6 products.
D. Class 5.8 applies only to bolts and screws with lengths 150 mm and shorter and to studs of all lengths.
E. Caution is advised when considering the use of Class 12.9 bolts, screws, and studs. Capability of the bolt manufacturer, as well as the anticipated in-use environment,
should be considered. High-strength products of Class 12.9 require rigid control of heat-treating operations and careful monitoring of as-quenched hardness, surface
discontinuities, depth of partial decarburization, and freedom from carburization. Some environments may cause stress corrosion cracking of nonplated as well as
electroplated products.