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.
Nord-Lock Wedge-Lock Washers
Nord-Lock Stainless Steel Washers (NLss / NLspss)
Surface-hardened EN 1.4404 (316L) washers, M3 to M80, for stainless bolts up to A4-80.
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Overview
EN 1.4404 (AISI 316L) is a widely used stainless steel with good corrosion resistance in general applications. These washers are the reliable choice where chlorides and acids are not present.
Surface hardened to at least 520 HV0.05 so the serrations bite into stainless bolts and parts. Laser marking: SS. Stainless Nord-Lock washers are standard stock items.
Specifications
| Product designation | NLss (regular), NLspss (enlarged Ø) |
|---|---|
| Material | EN 1.4404 (AISI 316L), surface hardened |
| Washer hardness | ≥ 520 HV0.05 |
| Corrosion resistance | PREN 27 |
| Bolt grades | Up to A4-80 |
| Temperature | −160 °C to 500 °C |
| Size range | M3 to M80; #5 to 3 1/8” |
| Laser marking | SS |
Sizes and dimensions (56 items)
| Metric | UNC | Product designation | Type | Øi (mm) | Øo (mm) | Thickness T (mm) | Approx. weight (kg/100 pairs) | Min. package (pairs) |
|---|---|---|---|---|---|---|---|---|
| M3 | #5 | NL3ss | Regular | 3.4 | 7.0 | 2.2 | 0.04 | 200 |
| M3.5 | #6 | NL3.5ss | Regular | 3.9 | 7.6 | 2.2 | 0.04 | 200 |
| M3.5 | #6 | NL3.5spss | Enlarged Ø (sp) | 3.9 | 9.0 | 2.2 | 0.07 | 200 |
| M4 | #8 | NL4ss | Regular | 4.4 | 7.6 | 2.2 | 0.04 | 200 |
| M4 | #8 | NL4spss | Enlarged Ø (sp) | 4.4 | 9.0 | 2.2 | 0.07 | 200 |
| M5 | #10 | NL5ss | Regular | 5.4 | 9.0 | 2.2 | 0.06 | 200 |
| M5 | #10 | NL5spss | Enlarged Ø (sp) | 5.4 | 10.8 | 2.2 | 0.11 | 200 |
| M6 | — | NL6ss | Regular | 6.5 | 10.8 | 2.2 | 0.09 | 200 |
| M6 | — | NL6spss | Enlarged Ø (sp) | 6.5 | 13.5 | 2.1 | 0.16 | 200 |
| — | 1/4” | NL1/4”ss | Regular | 7.2 | 11.5 | 2.2 | 0.09 | 200 |
| — | 1/4” | NL1/4”spss | Enlarged Ø (sp) | 7.2 | 13.5 | 2.2 | 0.15 | 200 |
| M8 | 5/16” | NL8ss | Regular | 8.7 | 13.5 | 2.0 | 0.12 | 200 |
| M8 | 5/16” | NL8spss | Enlarged Ø (sp) | 8.7 | 16.6 | 2.2 | 0.23 | 200 |
| — | 3/8” | NL3/8”ss | Regular | 10.3 | 16.6 | 2.0 | 0.19 | 200 |
| — | 3/8” | NL3/8”spss | Enlarged Ø (sp) | 10.3 | 21.0 | 2.0 | 0.38 | 200 |
| M10 | — | NL10ss | Regular | 10.7 | 16.6 | 2.0 | 0.18 | 200 |
| M10 | — | NL10spss | Enlarged Ø (sp) | 10.7 | 21.0 | 2.3 | 0.37 | 200 |
| M11 | 7/16” | NL11ss | Regular | 11.4 | 18.5 | 2.2 | 0.26 | 200 |
| M12 | — | NL12ss | Regular | 13.0 | 19.5 | 2.1 | 0.23 | 200 |
| M12 | — | NL12spss | Enlarged Ø (sp) | 13.0 | 25.4 | 3.0 | 0.82 | 100 |
| — | 1/2” | NL1/2”ss | Regular | 13.5 | 19.5 | 2.0 | 0.22 | 200 |
| — | 1/2” | NL1/2”spss | Enlarged Ø (sp) | 13.5 | 25.4 | 3.2 | 0.80 | 100 |
| M14 | 9/16” | NL14ss | Regular | 15.2 | 23.0 | 3.0 | 0.49 | 100 |
| M14 | 9/16” | NL14spss | Enlarged Ø (sp) | 15.2 | 30.7 | 3.2 | 1.31 | 100 |
| M16 | 5/8” | NL16ss | Regular | 17.0 | 25.4 | 3.0 | 0.59 | 100 |
| M16 | 5/8” | NL16spss | Enlarged Ø (sp) | 17.0 | 30.7 | 3.2 | 1.13 | 100 |
| M18 | — | NL18ss | Regular | 19.5 | 29.0 | 3.2 | 0.80 | 100 |
| M18 | — | NL18spss | Enlarged Ø (sp) | 19.5 | 34.5 | 3.2 | 1.56 | 100 |
| — | 3/4” | NL3/4”ss | Regular | 20.0 | 30.7 | 3.2 | 0.96 | 100 |
| — | 3/4” | NL3/4”spss | Enlarged Ø (sp) | 20.0 | 39.0 | 3.2 | 2.10 | 100 |
| M20 | — | NL20ss | Regular | 21.4 | 30.7 | 3.0 | 0.82 | 100 |
| M20 | — | NL20spss | Enlarged Ø (sp) | 21.4 | 39.0 | 3.2 | 2.06 | 100 |
| M22 | 7/8” | NL22ss | Regular | 23.4 | 34.5 | 3.2 | 1.23 | 100 |
| M22 | 7/8” | NL22spss | Enlarged Ø (sp) | 23.4 | 42.0 | 3.2 | 2.22 | 50 |
| M24 | — | NL24ss | Regular | 25.3 | 39.0 | 3.2 | 1.59 | 100 |
| M24 | — | NL24spss | Enlarged Ø (sp) | 25.3 | 48.5 | 4.5 | 4.47 | 50 |
| — | 1” | NL1”ss | Regular | 27.9 | 39.0 | 3.2 | 1.42 | 100 |
| — | 1” | NL1”spss | Enlarged Ø (sp) | 27.9 | 48.5 | 3.2 | 2.79 | 50 |
| M27 | — | NL27ss | Regular | 28.4 | 42.0 | 6.8 | 3.45 | 50 |
| M27 | — | NL27spss | Enlarged Ø (sp) | 28.4 | 48.5 | 6.8 | 5.34 | 25 |
| M30 | 1 1/8” | NL30ss | Regular | 31.4 | 47.0 | 6.8 | 4.49 | 50 |
| M30 | 1 1/8” | NL30spss | Enlarged Ø (sp) | 31.4 | 58.5 | 6.8 | 9.18 | 25 |
| M33 | 1 1/4” | NL33ss | Regular | 34.4 | 48.5 | 6.8 | 4.28 | 25 |
| M36 | 1 3/8” | NL36ss | Regular | 37.4 | 55.0 | 6.8 | 5.96 | 25 |
| M39 | 1 1/2” | NL39ss | Regular | 40.4 | 58.5 | 6.8 | 6.74 | 25 |
| M42 | — | NL42ss | Regular | 43.2 | 63.0 | 6.8 | 7.50 | 25 |
| M45 | 1 3/4” | NL45ss | Regular | 46.2 | 70.0 | 6.8 | 10.20 | 25 |
| M48 | — | NL48ss | Regular | 49.6 | 75.0 | 6.8 | 12.00 | 25 |
| M52 | 2” | NL52ss | Regular | 53.6 | 80.0 | 9.0 | 18.04 | 1 |
| M56 | 2 1/4” | NL56ss | Regular | 59.1 | 85.0 | 9.0 | 21.30 | 1 |
| M60 | — | NL60ss | Regular | 63.1 | 90.0 | 9.0 | 23.50 | 1 |
| M64 | 2 1/2” | NL64ss | Regular | 67.1 | 95.0 | 9.0 | 25.80 | 1 |
| M68 | — | NL68ss | Regular | 71.1 | 100.0 | 9.0 | 28.20 | 1 |
| M72 | — | NL72ss | Regular | 75.1 | 105.0 | 9.0 | 30.70 | 1 |
| M76 | 3” | NL76ss | Regular | 79.1 | 110.0 | 9.0 | 33.30 | 1 |
| M80 | 3 1/8” | NL80ss | Regular | 83.1 | 115.0 | 9.0 | 36.00 | 1 |
Tolerances. Øi: ±0.1 mm (NL3ss–NL8spss), ±0.2 mm (NL3/8″ss–NL42ss), +0.5/−0 mm (NL45ss–NL80ss). Øo: ±0.2 mm (NL3ss–NL1″spss), ±0.3 mm (NL27ss–NL42ss), +0/−2.0 mm (NL45ss–NL80ss). T: ±0.25 mm (NL3ss–NL1″spss), +0/−0.5 mm (NL27ss–NL42ss), ±0.75 mm (NL45ss–NL80ss).
Torque guidelines: stainless steel bolts
Indicative values verified by Nord-Lock in test laboratories, calculated with the Kellerman & Klein formula. GF = preload as % of bolt yield point. µth = thread friction, µh = under-head friction. Cu/C paste = copper/graphite paste (Molykote® 1000); oil = WD-40. Conditions and joint designs vary: ask us for a calculation for your joint. 1 Nm = 0.738 ft-lb.
| A4-70 bolt, Cu/C paste · GF 65%, µ 0.13 | A4-80 bolt, Cu/C paste · GF 65%, µ 0.13 | |||||
|---|---|---|---|---|---|---|
| Bolt size | Washer | Pitch (mm) | Torque (Nm) | Clamp load (kN) | Torque (Nm) | Clamp load (kN) |
| M3 | NL3ss | 0.50 | 0.8 | 1.5 | 1.1 | 2.0 |
| M4 | NL4ss | 0.70 | 1.8 | 2.6 | 2.4 | 3.4 |
| M5 | NL5ss | 0.80 | 3.6 | 4.1 | 4.8 | 5.5 |
| M6 | NL6ss | 1.00 | 6.3 | 5.9 | 8.4 | 7.8 |
| M8 | NL8ss | 1.25 | 15.0 | 11.0 | 20.0 | 14.0 |
| M10 | NL10ss | 1.50 | 30.0 | 17.0 | 39.0 | 23.0 |
| M12 | NL12ss | 1.75 | 51.0 | 25.0 | 68.0 | 33.0 |
| M14 | NL14ss | 2.00 | 81.0 | 34.0 | 108.0 | 45.0 |
| M16 | NL16ss | 2.00 | 124.0 | 46.0 | 165.0 | 61.0 |
| M18 | NL18ss | 2.50 | 173.0 | 56.0 | 231.0 | 75.0 |
| M20 | NL20ss | 2.50 | 243.0 | 72.0 | 323.0 | 95.0 |
| M22 | NL22ss | 2.50 | 330.0 | 89.0 | 440.0 | 118.0 |
| M24 | NL24ss | 3.00 | 418.0 | 103.0 | 557.0 | 137.0 |
| M27 | NL27ss | 3.00 | 609.0 | 134.0 | 812.0 | 179.0 |
| M30 | NL30ss | 3.50 | 831.0 | 164.0 | 1,108.0 | 219.0 |
| M36 | NL36ss | 4.00 | 1,444.0 | 239.0 | 1,925.0 | 319.0 |
Key features
- Regular and enlarged outer diameter (sp)
- Supplied as pre-assembled pairs
- Laser marked for traceability
Applications
Food and pharma machineryWater treatmentArchitectural stainlessGeneral stainless assemblies
Need a size, grade or finish not listed?We also supply special and non-standard parts to drawing.Send enquiry
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