Overview
Washers made from Alloy C-276 (EN 2.4819 or equivalent) are extremely corrosion resistant and protect against aggressive and localised corrosion, so they are well suited to chemical plants.
They resist oxidisers such as ferric and cupric chlorides, hot contaminated organic and inorganic media, wet chlorine gas, acids, hypochlorite and chlorine dioxide. Laser marking: 276.
Specifications
| Product designation | NLss-276, NLspss-276 |
|---|---|
| Material | EN 2.4819 or equivalent, surface hardened |
| Washer hardness | ≥ 520 HV0.05 |
| Corrosion resistance | PREN 68 |
| Temperature | −160 °C to 500 °C |
| Size range | M4 to M20; #8 to 5/8” |
| Laser marking | 276 |
Sizes and dimensions (11 items)
| Metric | UNC | Product designation | Type | Øi (mm) | Øo (mm) | Thickness T (mm) | Approx. weight (kg/100 pairs) | Min. package (pairs) |
|---|---|---|---|---|---|---|---|---|
| M4 | #8 | NL4ss-276 | Regular | 4.4 | 7.6 | 2.3 | 0.053 | 200 |
| M5 | #10 | NL5ss-276 | Regular | 5.4 | 9.0 | 2.3 | 0.072 | 200 |
| M6 | — | NL6ss-276 | Regular | 6.5 | 10.8 | 2.3 | 0.104 | 200 |
| M8 | 5/16” | NL8ss-276 | Regular | 8.7 | 13.5 | 2.3 | 0.151 | 200 |
| M8 | 5/16” | NL8spss-276 | Enlarged Ø (sp) | 8.7 | 16.6 | 2.3 | 0.281 | 200 |
| M10 | — | NL10ss-276 | Regular | 10.7 | 16.6 | 2.3 | 0.228 | 200 |
| M10 | — | NL10spss-276 | Enlarged Ø (sp) | 10.7 | 21.0 | 2.3 | 0.457 | 200 |
| M12 | — | NL12ss-276 | Regular | 13.0 | 19.5 | 2.3 | 0.300 | 200 |
| M12 | — | NL12spss-276 | Enlarged Ø (sp) | 13.0 | 25.4 | 3.0 | 0.962 | 100 |
| M16 | 5/8” | NL16ss-276 | Regular | 17.0 | 25.4 | 3.0 | 0.726 | 100 |
| M20 | — | NL20ss-276 | Regular | 21.4 | 30.7 | 3.0 | 0.989 | 100 |
Tolerances. Øi: ±0.1 mm (NL4ss-276–NL8spss-276), ±0.2 mm (NL10ss-276–NL20ss-276). Øo: ±0.2 mm. T: ±0.4 mm (NL4ss-276–NL12ss-276), ±0.5 mm (NL12spss-276–NL20ss-276). Torque values on request.
Key features
- Regular and enlarged outer diameter (sp)
- Supplied as pre-assembled pairs
- Laser marked for traceability
Applications
Chemical and process plantsEvaporatorsOffshore downhole toolingAcidic environments
Need a size, grade or finish not listed? We also make special and non-standard parts to drawing. Ask us →
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