Specifying E-Clips (External Snap Rings) in Grade 8.8 Steel pairs the dimensional form of E-Clips (External Snap Rings) (DIN 6799) with the engineering properties of Grade 8.8 Steel. This page explains when to choose the grade, how it behaves in service, and which grades to compare it against.
Why Choose Grade 8.8 Steel for E-Clips (External Snap Rings)
The workhorse medium-carbon alloy grade for structural joints. For e-clips (external snap rings), this matters when requires plating (zinc) for corrosion protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 8.8 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating (zinc) for corrosion protection |
Corrosion Behavior in Service
Carbon and alloy steel e-clips (external snap rings) 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 E-Clips (External Snap Rings), class 10.9 or 12.9 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 E-Clips (External Snap Rings) Available in Grade 8.8 Steel
| Groove diameter (mm) | Shaft diameter range (mm) | Outside diameter (mm) | Thickness s (mm) | Reference standard | Notes |
|---|---|---|---|---|---|
| 1.2 | 1.4~2.0 | 3.0 | 0.3 | DIN 6799 | E-clip, radial-fit external retaining |
| 1.5 | 2.0~2.5 | 3.8 | 0.4 | DIN 6799 | E-clip, radial-fit external retaining |
| 1.9 | 2.5~3.2 | 4.8 | 0.4 | DIN 6799 | E-clip, radial-fit external retaining |
| 2.3 | 3.2~4.0 | 6.0 | 0.6 | DIN 6799 | E-clip, radial-fit external retaining |
| 3.2 | 4.0~5.0 | 7.4 | 0.6 | DIN 6799 | E-clip, radial-fit external retaining |
| 4.0 | 5.0~7.0 | 9.0 | 0.7 | DIN 6799 | E-clip, radial-fit external retaining |
| 5.0 | 7.0~9.0 | 11.0 | 0.7 | DIN 6799 | E-clip, radial-fit external retaining |
| 6.0 | 9.0~11.0 | 12.2 | 0.8 | DIN 6799 | E-clip, radial-fit external retaining |
| 7.0 | 11.0~14.0 | 14.3 | 0.9 | DIN 6799 | E-clip, radial-fit external retaining |
| 8.0 | 14.0~18.0 | 16.2 | 1.0 | DIN 6799 | E-clip, radial-fit external retaining |
| 9.0 | 18.0~24.0 | 18.0 | 1.0 | DIN 6799 | E-clip, radial-fit external retaining |
| 10.0 | 24.0~31.0 | 20.2 | 1.2 | DIN 6799 | E-clip, radial-fit external retaining |
| 12.0 | 31.0~38.0 | 23.2 | 1.2 | DIN 6799 | E-clip, radial-fit external retaining |
| 15.0 | 38.0~45.0 | 29.0 | 1.5 | DIN 6799 | E-clip, radial-fit external retaining |
| 19.0 | 45.0~55.0 | 37.0 | 1.75 | DIN 6799 | E-clip, radial-fit external retaining |
| 24.0 | 55.0~70.0 | 44.0 | 2.0 | DIN 6799 | E-clip, radial-fit external retaining |