Nord-Lock Wedge Lock Washer System NL10–NL24

Description

1. Product Overview
   The Nord-Lock Wedge Lock Washer System NL10–NL24 is a high-performance mechanical fastening solution comprising paired washers with a unique wedge-locking cam design that secures bolted joints using tension instead of friction. Its primary industrial use is preventing spontaneous loosening of bolted connections exposed to severe vibration, dynamic loads, and extreme operational stress across heavy machinery, construction, and infrastructure sectors. The key value proposition is maximum security: the wedge effect created beneath the bolt head or nut makes unintentional loosening virtually impossible, while maintaining preload even at low pre-tension levels. This product is strategically important in the market because it eliminates the need for retightening, reduces maintenance costs, and provides officially approved reliability in critical sectors like railways and construction.

2. Key Specifications & Technical Characteristics

• Chemical composition or material components: High-strength tempered carbon steel (EN 1.7182) or stainless steel options (EN 1.4404, 254SMO)

• Purity level or grade: Through-hardened steel with hardness ≥ 465 HV1 for standard carbon steel; surface hardness ≥ 520 HV0.05 after Kolsterising® for stainless steel

• Physical characteristics:

  • Form: Paired washers with cam-shaped wedges on one side and radial serrations on the opposite side

  • Nominal sizes: NL10 (M10) through NL24 (M24) metric bolt sizes

  • Inner diameter (d): 10.7mm (NL10) scaling proportionally for larger sizes

  • Outside diameter (D): 16.6mm (NL10)

  • Thickness (T): 2.5mm

  • Finish: Delta Protekt® zinc flake coating providing corrosion resistance

• Packaging options: Sold as paired sets (quantity 10 = 10 sets for 10 bolts); available in packs of 20 units

• Shelf life: Indefinite when stored properly; corrosion resistance rated for minimum 1,000 hours salt spray test (ISO 9227)

• Temperature range: -50°C to 200°C operating temperature

3. Core Industrial Applications

• Primary industries that use this product: Heavy machinery, automotive, construction, wind energy, railways, oil & gas, and aerospace

• Specific operational use cases:

  • Securing bolted joints on heavy machinery exposed to continuous vibration

  • Railway track and vehicle bolt connections requiring official approval

  • Construction structural bolted connections in dynamic load environments

  • Wind turbine bolted assemblies subject to wind-induced vibration

  • Oil & gas pipeline flange bolted connections

• Why this product performs better than alternatives: Nord-Lock uses tension-based locking rather than friction-based methods, making it superior to conventional screw locks and friction-dependent fasteners

• Efficiency, durability, or cost advantages:

  • Maximum security even under strong vibration and dynamic stress

  • No retightening required—connections remain secure permanently

  • Quick assembly and disassembly without special tools

  • Reusable system reduces replacement costs

  • Works with all common bolt grades (4.8, 5.6, 8.8, 10.9, 12.9)

4. Competitive Advantages

• Quality consistency: Laser-marked with Nord-Lock brand name, control number, and type code for complete traceability

• Supply reliability: Officially approved and well-proven in use globally; available in sizes M3–M130 (metric) and #5–3″ (imperial)

• Logistics capability: Standardized paired packaging enables efficient bulk shipping; compatible with flanged bolts and nuts per ISO 4161/4162

• Price competitiveness: High documented success across industries worldwide reduces total cost of ownership through maintenance elimination

• Sustainability or environmental benefits: Environmentally friendly, corrosion-resistant, and reusable system; Delta Protekt® coating provides excellent corrosion protection

• Technical support or documentation availability: Full compliance with DIN 25201 and ISO 16103 standards; documented success in demanding environments

5. Commercial & Supply Information

• Minimum order quantity (MOQ): BULK 20MT

• Loading capacity (MT per container): Standard industrial container loading for 20MT bulk quantity (typically 20–25 MT per 40-foot container for steel fasteners)