Overview
Alloy 718 (EN 2.4668 or equivalent) has exceptional yield, tensile and creep-rupture strength at high temperatures, together with good corrosion resistance.
That makes these washers the best choice for high-temperature joints in jet engines, gas turbines, turbochargers, incinerators, nuclear reactors and pumps. Laser marking: 718.
Specifications
| Product designation | NLss-718, NLspss-718 |
|---|---|
| Material | EN 2.4668 or equivalent, surface hardened |
| Washer hardness | ≥ 620 HV0.05 |
| Corrosion resistance | PREN 29 |
| Temperature | −160 °C to 700 °C |
| Size range | M4 to M20; #8 to 3/4” |
| Laser marking | 718 |
Sizes and dimensions (15 items)
| Metric | UNC | Product designation | Type | Øi (mm) | Øo (mm) | Thickness T (mm) | Approx. weight (kg/100 pairs) | Min. package (pairs) |
|---|---|---|---|---|---|---|---|---|
| M4 | #8 | NL4ss-718 | Regular | 4.4 | 7.6 | 2.3 | 0.049 | 200 |
| M5 | #10 | NL5ss-718 | Regular | 5.4 | 9.0 | 2.3 | 0.066 | 200 |
| M6 | — | NL6ss-718 | Regular | 6.5 | 10.8 | 2.3 | 0.095 | 200 |
| — | 1/4” | NL1/4”ss-718 | Regular | 7.2 | 11.5 | 2.3 | 0.103 | 200 |
| M8 | 5/16” | NL8ss-718 | Regular | 8.7 | 13.5 | 2.3 | 0.139 | 200 |
| M8 | 5/16” | NL8spss-718 | Enlarged Ø (sp) | 8.7 | 16.6 | 2.3 | 0.259 | 200 |
| — | 3/8” | NL3/8”ss-718 | Regular | 10.3 | 16.6 | 2.3 | 0.221 | 200 |
| M10 | — | NL10ss-718 | Regular | 10.7 | 16.6 | 2.3 | 0.210 | 200 |
| M10 | — | NL10spss-718 | Enlarged Ø (sp) | 10.7 | 21.0 | 2.3 | 0.421 | 200 |
| M12 | — | NL12ss-718 | Regular | 13.0 | 19.5 | 2.3 | 0.277 | 200 |
| M12 | — | NL12spss-718 | Enlarged Ø (sp) | 13.0 | 25.4 | 3.2 | 0.886 | 100 |
| — | 1/2” | NL1/2”ss-718 | Regular | 13.5 | 19.5 | 2.3 | 0.259 | 200 |
| M16 | 5/8” | NL16ss-718 | Regular | 17.0 | 25.4 | 3.2 | 0.669 | 100 |
| — | 3/4” | NL3/4”ss-718 | Regular | 20.0 | 30.7 | 3.2 | 1.024 | 100 |
| M20 | — | NL20ss-718 | Regular | 21.4 | 30.7 | 3.2 | 0.911 | 100 |
Tolerances. Øi: ±0.1 mm (NL4ss-718–NL8spss-718), ±0.2 mm (NL3/8″ss-718–NL20ss-718). Øo: ±0.2 mm. T: ±0.4 mm (NL4ss-718–NL12ss-718, NL1/2″ss), ±0.5 mm (NL12spss-718–NL20ss-718). Torque values on request.
Key features
- Regular and enlarged outer diameter (sp)
- Supplied as pre-assembled pairs
- Laser marked for traceability
Applications
Gas turbines and jet enginesTurbochargersIncineratorsNuclear and high-temperature pumps
Need a size, grade or finish not listed? We also make special and non-standard parts to drawing. Ask us →
Related products
All products →You may also need
Nord-Lock Original Wedge-Lock WashersA pair of wedge-locking washers that secures bolted joints with tension instead of friction. M3 to M130, five materials.View details →
Nord-Lock Steel Washers (NL / NLsp)Through-hardened steel washers with Delta Protekt® zinc flake coating, M3 to M130, for bolts up to grade 12.9.View details →
Nord-Lock Stainless Steel Washers (NLss / NLspss)Surface-hardened EN 1.4404 (316L) washers, M3 to M80, for stainless bolts up to A4-80.View details →
Nord-Lock 254 SMO® Washers (NLss-254)High-alloy austenitic stainless washers for salt water and high-chloride environments, M3 to M39.View details →