A4 Stainless Steel Needle Roller Bearing — ISO / DIN (Series 133) pairs the standard ISO / DIN with a A4 Stainless Steel base material. The sections below cover why engineers select this grade for needle roller bearing — iso / din (series 133), its corrosion and temperature behavior, and the sizes available.
Why Choose A4 Stainless Steel for Needle Roller Bearing — ISO / DIN (Series 133)
Specified for marine, coastal and chemical applications. For needle roller bearing — iso / din (series 133), this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A4-80 (316) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Needle Roller Bearing — ISO / DIN (Series 133) in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Needle Roller Bearing — ISO / DIN (Series 133), the alternative stainless grade is A2 (304). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.
Sizes of Needle Roller Bearing — ISO / DIN (Series 133) Available in A4 Stainless Steel
| Bore d (mm) | Outer diameter D (mm) | Width B (mm) | Dynamic load C (kN) | Reference standard |
|---|---|---|---|---|
| 8 | 15 | 12 | 7.2 | ISO 1206 / GB/T 309 |
| 10 | 17 | 12 | 8.3 | ISO 1206 / GB/T 309 |
| 12 | 19 | 12 | 9.65 | ISO 1206 / GB/T 309 |
| 15 | 23 | 12 | 12.5 | ISO 1206 / GB/T 309 |
| 20 | 28 | 16 | 18.7 | ISO 1206 / GB/T 309 |
| 25 | 33 | 16 | 22.8 | ISO 1206 / GB/T 309 |
| 30 | 40 | 20 | 33.0 | ISO 1206 / GB/T 309 |
| 40 | 50 | 20 | 42.5 | ISO 1206 / GB/T 309 |