Number | Designation | |
---|---|---|
0 | Pig iron, ferroalloys, cast iron | |
1 | Steel, cast steel | |
2 | Heavy metals | |
3 | Light metals | |
4-8 | Non-metallic materials | |
9 | Free |
Digit | Designation | |
---|---|---|
2 and 3 | Sort class (e.g. chemically resistant steels) | |
4 and 5 | Count number |
Digit 6 | Steelmaking process | |
---|---|---|
0 | indefinite, without meaning | |
1 | unquenched Thomas steel | |
2 | quenched Thomas steel | |
3 | other type of melting - unquenched | |
4 | other type of melting - quenched | |
5 | unquenched siemens martin steel | |
6 | quenched siemens martin steel | |
7 | unquenched oxygen inflation steel | |
8 | quenched oxygen inflation steel | |
9 | Electric steel |
Digit 7 | Treatment condition | |
---|---|---|
0 | None or any treatment | |
1 | normalized annealed | |
2 | soft annealed | |
3 | heat treated for good machinability | |
4 | tough tempered | |
5 | tempered | |
6 | hard tempered | |
7 | cold tempered | |
8 | feather hard work hardened | |
9 | treated according to special specifications | |
Source: DIN EN 10027-2 - Designation systems for steels; Part 2: Numbering system |
Screw | ||||||||||||||||
50 | 70 | KB | YK | YB | KG | GA | GB | GC | V | VH | VW | S | SD | SB | ||
Nut | 50 | O | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
70 | O | O | - | - | - | - | - | - | - | - | - | - | - | - | - | |
80 | X | X | - | - | - | - | - | - | - | - | - | - | - | - | - | |
KB | - | - | X | - | - | - | - | - | - | - | - | - | - | - | - | |
Y | - | - | - | O | O | O | - | - | - | - | - | - | - | - | - | |
YK | - | - | - | X | X | X | - | - | - | - | - | - | - | - | - | |
YB | - | - | - | O | O | O | - | - | - | - | - | - | - | - | - | |
KG | - | - | - | - | - | O | X | - | - | - | - | - | - | - | - | |
GA | - | - | - | - | - | X | X | X | X | - | - | - | - | - | - | |
GB | - | - | - | - | - | - | O | O | O | - | - | - | - | - | - | |
GC | - | - | - | - | - | - | O | O | O | - | - | - | - | - | - | |
V | - | - | - | - | - | - | - | - | - | O | O | O | - | - | - | |
VH | - | - | - | - | - | - | - | - | - | O | O | O | - | - | - | |
VW | - | - | - | - | - | - | - | - | - | O | O | O | - | - | - | |
S | - | - | - | - | - | - | - | - | - | - | - | - | O | - | - | |
SD | - | - | - | - | - | - | - | - | - | - | - | - | - | O | - | |
SB | - | - | - | - | - | - | - | - | - | - | - | - | - | - | O | |
X O - |
Preferred combination Permitted combination Not recommended |
|||||||||||||||
Source: DIN 267-13 - Mechanical fasteners - Technical delivery conditions - Part 13: Parts for bolted joints with special mechanical properties for use at temperatures from -200 °C to +700 °C |
Marking | Standard | Description | Material | Comparable EN material |
---|---|---|---|---|
No Grade Mark |
SAE J429 | Bolts, Screws, Studs |
Low or Medium Carbon Steel |
--- |
ASTM A307 Grade A & B |
Low Carbon Steel | --- | ||
SAE J429 Grade 2 |
Low or Medium Carbon Steel |
--- | ||
No Grade Mark | SAE J429 Grade 4 |
Studs | Medium Carbon Cold Drawn Steel |
--- |
B5 | ASTM A193 Grade B5 |
Bolts, Screws, Studs for high temperature service Class 1: Carbide solution treated |
AISI 501 | ~1.7362 |
B6 | ASTM A193 Grade B6 |
AISI 410 | ~1.4006 | |
B7 | ASTM A193 Grade B7 |
AISI 4140, 4142, 4105 | ~1.7225 | |
B16 | ASTM A193 Grade B16 |
CrMoVa Alloy Steel |
~1.7711 | |
B8 |
ASTM A193 Grade B8 Class 1 |
AISI 304 |
~1.4301 |
|
B8C |
ASTM A193 Grade B8C Class 1 |
AISI 347 |
~1.4550 |
|
B8M |
ASTM A193 Grade B8M Class 1 |
AISI 316 |
~1.4401 |
|
B8T |
ASTM A193 Grade B8T Class 1 |
AISI 321 |
~1.4541 |
|
B8 |
ASTM A193 Grade B8 Class 2 |
Bolts, Screws, Studs for high temperature service Class 2: Carbide solution treated and strain hardened |
AISI 304 Strain Hardened |
~1.4301 |
B8C |
ASTM A193 Grade B8C Class 2 |
AISI 347 Strain Hardened |
~1.4550 | |
B8M |
ASTM A193 Grade B8M Class 2 |
AISI 316 Strain Hardened |
~1.4401 | |
B8T |
ASTM A193 Grade B8T Class 2 |
AISI 321 Strain Hardened |
~1.4541 | |
L7 | ASTM A320 Grade L7 |
Bolts, Screws, Studs for low temperature service Quenched and tempered |
AISI 4140, 4142, 4145 |
~1.7225 |
L7A | ASTM A320 Grade L7A |
AISI 4037 | --- | |
L7B | ASTM A320 Grade L7B |
AISI 4137 | ~1.7220 | |
L7C | ASTM A320 Grade L7C |
AISI 8740 | ~1.6546 | |
L43 | ASTM A320 Grade L43 |
AISI 4340 | ~1.6580 | |
B8 |
ASTM A320 Grade B8 Class 1 |
Bolts, Screws, Studs for low temperature service Class 1: Carbide solution treated |
AISI 304 |
~1.4301 |
B8C |
ASTM A320 Grade B8C Class 1 |
AISI 347 |
~1.4550 |
|
B8T |
ASTM A320 Grade B8T Class 1 |
AISI 321 |
~1.4541 |
|
B8F |
ASTM A320 Grade B8F Class 1 |
AISI 303 (Se) |
~1.4305 |
|
B8M |
ASTM A320 Grade B8M Class 1 |
AISI 316 |
~1.4401 |
|
B8 |
ASTM A320 Grade B8 Class 2 |
Bolts, Screws, Studs for low temperature service Class 2: Carbide solution treated and strain hardened |
AISI 304 |
~1.4301 |
B8C |
ASTM A320 Grade B8C Class 2 |
AISI 347 |
~1.4550 |
|
B8T |
ASTM A320 Grade B8T Class 2 |
AISI 321 |
~1.4541 |
|
B8F |
ASTM A320 Grade B8F Class 2 |
AISI 303 (Se) |
~1.4305 |
|
B8M |
ASTM A320 Grade B8M Class 2 |
AISI 316 |
~1.4401 |
|
3 Radial Lines 120° |
SAE J429 Grade 5 |
Bolts, Screws, Studs |
Medium Carbon Steel Quenched and Tempered |
--- |
ASTM A449 | ||||
3 Radial Lines 90° |
SAE J429 Grade 5.1 |
Bolts, Screws, Studs |
Low or Medium Carbon Steel Quenched and Tempered |
--- |
3 Radial Lines 60° |
SAE J429 Grade 5.2 |
Bolts, Screws, Studs |
Low Carbon Martensitic Steel Quenched and Tempered |
--- |
A325 | ASTM A325 Type 1 |
High strength structural bolts |
Medium Carbon Steel Quenched and Tempered |
--- |
--- |
ASTM A325 Type 2 (Withdrawn) |
Low Carbon Martensitic Steel Quenched and Tempered |
--- |
|
A325 |
ASTM A325 Type 3 |
Atmospheric Corrosion Resisting Steel Quenched and Tempered |
--- |
|
BD | ASTM A354 Grade BD |
Bolts, Studs |
Alloy Steel Quenched and Tempered |
--- |
BC | ASTM A354 Grade BC |
--- | ||
5 Radial Lines |
SAE J429 Grade 7 |
Bolts, Screws |
Medium Carbon Alloy Steel Quenched and Tempered |
--- |
6 Radial Lines 60° |
SAE J429 Grade 8 |
Bolts, Screws, Studs |
Medium Carbon Alloy Steel Quenched and Tempered |
--- |
No Grade Mark |
SAE J429 Grade 8.1 |
Studs |
Medium Carbon Alloy or SAE 1041 Modified Elevated Quenched and Tempered |
--- |
A490 | ASTM A490 | High strength structural bolts |
Alloy Steel Quenched and Tempered |
--- |
Sources: http://praticalmaintenance.wordpress.com (24.08.2011) |