Grade 12.9 Steel Clevis Pin — ISO / DIN (Series 105) pairs the standard ISO / DIN with a Grade 12.9 Steel base material. The sections below cover why engineers select this grade for clevis pin — iso / din (series 105), its corrosion and temperature behavior, and the sizes available.
Why Choose Grade 12.9 Steel for Clevis Pin — ISO / DIN (Series 105)
The highest common strength class, for high-load machine assembly. For clevis pin — iso / din (series 105), 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 |
Corrosion Behavior in Service
Carbon and alloy steel clevis pin — iso / din (series 105) require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.
Comparable Grades
For Clevis Pin — ISO / DIN (Series 105), 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 Clevis Pin — ISO / DIN (Series 105) Available in Grade 12.9 Steel
| Nominal diameter (mm) | Length L (mm) | Head diameter (mm) | Cotter pin hole (mm) | Material | Reference standard |
|---|---|---|---|---|---|
| 3 | 16 | 5 | 1.0 | Carbon steel | ISO 2341 / GB/T 882 |
| 4 | 20 | 7 | 1.2 | Carbon steel | ISO 2341 / GB/T 882 |
| 5 | 25 | 8 | 1.6 | Carbon steel | ISO 2341 / GB/T 882 |
| 6 | 32 | 10 | 1.6 | Carbon steel | ISO 2341 / GB/T 882 |
| 8 | 40 | 12 | 2.0 | Carbon steel | ISO 2341 / GB/T 882 |
| 10 | 50 | 15 | 2.5 | Carbon steel | ISO 2341 / GB/T 882 |
| 12 | 63 | 18 | 3.2 | Carbon steel | ISO 2341 / GB/T 882 |
| 16 | 80 | 22 | 4.0 | Carbon steel | ISO 2341 / GB/T 882 |
| 20 | 100 | 28 | 4.0 | Carbon steel | ISO 2341 / GB/T 882 |