For Split Cotter Pin — ISO / DIN (Series 102) in Grade 12.9 Steel, the controlling decisions are corrosion, strength and service temperature. This guide summarizes those three for Grade 12.9 Steel Split Cotter Pin — ISO / DIN (Series 102) and lists every size we supply.
Why Choose Grade 12.9 Steel for Split Cotter Pin — ISO / DIN (Series 102)
The highest common strength class, for high-load machine assembly. For split cotter pin — iso / din (series 102), this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating or black-oxide protection |
Galvanic & Galling Considerations
For split cotter pin — iso / din (series 102) in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.
Comparable Grades
For Split Cotter Pin — ISO / DIN (Series 102), class 8.8 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.
Sizes of Split Cotter Pin — ISO / DIN (Series 102) Available in Grade 12.9 Steel
| Nominal diameter (mm) | Length L (mm) | Material | Reference standard |
|---|---|---|---|
| 1.0 | 16 | Carbon steel | ISO 1234 / GB/T 91 |
| 1.2 | 20 | Carbon steel | ISO 1234 / GB/T 91 |
| 1.6 | 25 | Carbon steel | ISO 1234 / GB/T 91 |
| 2.0 | 32 | Carbon steel | ISO 1234 / GB/T 91 |
| 2.5 | 40 | Carbon steel | ISO 1234 / GB/T 91 |
| 3.2 | 50 | Carbon steel | ISO 1234 / GB/T 91 |
| 4.0 | 63 | Carbon steel | ISO 1234 / GB/T 91 |
| 5.0 | 80 | Carbon steel | ISO 1234 / GB/T 91 |
| 6.3 | 100 | Carbon steel | ISO 1234 / GB/T 91 |
| 8.0 | 125 | Carbon steel | ISO 1234 / GB/T 91 |