ISO 7091 Plain Washer (Grade C)
ISO 7091 Plain Washers — Grade C
Normal Series Washers with Wider Tolerances
ISO 7091 defines Grade C flat washers — similar dimensions to ISO 7089 but with wider manufacturing tolerances. These economical washers are suitable for general-purpose applications where precision tolerances aren't critical.
Quick Specifications
Type
Flat (Plain)
Product Grade
Grade C
Tolerances
Wider
vs ISO 7089
Same Dims, Lower Grade
Grade A vs Grade C
| Feature | ISO 7089 (Grade A) | ISO 7091 (Grade C) |
|---|---|---|
| Flatness Tolerance | Tight | Relaxed |
| Dimensional Tolerance | ±0.1mm typical | ±0.2mm typical |
| Surface Finish | Smoother | Standard |
| Cost | Higher | Lower |
When to Use Grade C
General Assembly
Non-critical joints
Cost-Sensitive
High-volume production
Wood/Soft Materials
Tolerance less critical
Temporary Fastening
Jigs, fixtures