- Technology Driven, High Performance Fasteners
- Sonipat, Haryana India
- sales@bigboltnut.com
ISO 898-1 Grade 10.9
The Grade 10.9 Bolts, screws, and studs with specified property classes — coarse thread and fine pitch thread
The ISO 898-1:2013 Grade 10.9 specification covers carbon steel bolts and studs ranging from M-6 to M-64 diameter. We use high carbon steel material and high alloy steel raw materials to achieve the required properties of grade 10.9. There are three popular grades in this standard, 8.8, 10.9 and 12.9 which denote material hardness strength and their respective mechanical properties.
| 10.9 |  |
Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines |
|
Property class |
Material and heat treatment |
Chemical composition limit (cast analysis, %)a |
Tempering temperature ⁰C Min. |
||||
|
C |
P |
S |
Bb |
||||
|
min. |
max. |
max. |
max. |
max. |
|||
|
10.9 |
Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered |
0,20e |
0,55 |
0,025 |
0,025 |
0,003 |
425 |
|
Carbon steel quenched and tempered |
0,25 |
0,55 |
0,025 |
0,025 |
|||
|
Alloy steel quenched and temperedg |
0,20 |
0,55 |
0,025 |
0,025 |
|||
|
Mechanical or physical property |
Tensile strength, Rm, MPa |
Stress at 0,2 % non-proportional elongation, Rp0,2, MPa |
Stress under proof load, Spf, MPa |
Proof strength ratio Sp,nom/ReL,min |
Percentage elongation after fracture for machined test pieces, A, % |
Percentage reduction of area after fracture for machined test pieces, Z, % |
Height of non-decarburized thread zone, E, mm |
Depth of complete decarburization in the thread, G, mm |
Reduction of hardness after retempering, HV |
Impact strength, KVij, J |
||
|
nom.c |
min. |
nom.c |
min. |
nom. |
min |
min. |
min. |
min. |
max. |
max. |
min. |
|
|
10.9 |
1000 |
1040 |
900 |
940 |
830 |
0,88 |
9 |
48 |
2/3 H1 |
0,017 |
22 |
27 |
|
Mechanical or physical property |
Vickers hardness, HV F ≥98 N |
Brinell hardness, HBW F = 30 D2 |
Rockwell hardness, HRC |
Surface hardness, HV 0,3 |
|||
|
min. |
max. |
min. |
max. |
min. |
max. |
max. |
|
|
10.9 |
320 |
380 |
316 |
375 |
32 |
39 |
390 |