Material specification page for spring (roll) pin in Grade 8.8 Steel. Covers the grade designation (class 8.8), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO / DIN.
Why Choose Grade 8.8 Steel for Spring (Roll) Pin — ISO / DIN (Series 103)
The workhorse medium-carbon alloy grade for structural joints. For spring (roll) pin — iso / din (series 103), 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 spring (roll) pin — iso / din (series 103) 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 Spring (Roll) Pin — ISO / DIN (Series 103), 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 Spring (Roll) Pin — ISO / DIN (Series 103) Available in Grade 8.8 Steel
| Nominal diameter (mm) | Length L (mm) | Recommended hole (mm) | Material | Reference standard |
|---|---|---|---|---|
| 2 | 12 | 2.0 | Spring steel | ISO 8748 / DIN 1481 |
| 3 | 16 | 3.0 | Spring steel | ISO 8748 / DIN 1481 |
| 4 | 20 | 4.0 | Spring steel | ISO 8748 / DIN 1481 |
| 5 | 25 | 5.0 | Spring steel | ISO 8748 / DIN 1481 |
| 6 | 32 | 6.0 | Spring steel | ISO 8748 / DIN 1481 |
| 8 | 40 | 8.0 | Spring steel | ISO 8748 / DIN 1481 |
| 10 | 50 | 10.0 | Spring steel | ISO 8748 / DIN 1481 |
| 12 | 63 | 12.0 | Spring steel | ISO 8748 / DIN 1481 |
| 16 | 80 | 16.0 | Spring steel | ISO 8748 / DIN 1481 |