Nord-Lock Wedge Lock Washer — NL Series

Description

1. Product Overview

The Nord-Lock Wedge Lock Washer — NL Series is a high-performance, twin-washer bolt locking system engineered to prevent bolt loosening under vibration and dynamic loads in critical industrial applications. Its primary industrial use is securing bolted joints in heavy machinery, infrastructure, automotive, and mining equipment where safety and uptime are non-negotiable. The key value proposition lies in its wedge-locking mechanism based on tension rather than friction, delivering unmatched reliability compared to traditional spring washers or nylon inserts. Strategically, this product is essential for industries facing costly downtime and safety risks from loose fasteners, making it a critical component in global industrial sourcing portfolios.

2. Key Specifications & Technical Characteristics

• Material Components:

  • Standard NL Series: Carbon steel (EN 1.7182)

  • Optional variants: 316 stainless steel (SC-washer for structural steel), 254 SMO® stainless steel (saltwater environments)

• Surface Coating: Zinc flake coating with Delta Protekt® for corrosion protection (>1,000 hours salt spray resistance per ISO 9227)

• Hardness: Through-hardened to ≥465 HV1, ensuring the washer is harder than the bolt and contact surface

• Temperature Range: -50°C to +200°C

• Bolt Compatibility: Works with all common bolt grades: 4.8, 5.6, 8.8, 10.9, 12.9 (metric); #5–3” (imperial)

• Size Range:

  • Metric: M3–M39 (standard OD), M3.5–M36 (enlarged OD)

  • Inner diameter: 3.4 mm – 83.1 mm; Outer diameter: 7 mm – 115 mm

• Packaging: Sold in pairs; standard pack quantity = 10 pairs per pack for small sizes

• Traceability: Laser-marked with Nord-Lock brand name, control number, and type code

• Shelf Life: Indefinite when stored in dry conditions ( Delta Protekt® coating prevents degradation)

3. Core Industrial Applications

Why it performs better: Unlike friction-based locking methods, Nord-Lock uses cam geometry (cam pitch > thread pitch) to create a self-locking wedge effect under tension, making unintentional loosening impossible.

4. Competitive Advantages

• Quality Consistency: Through-hardened manufacturing + laser marking ensures batch-to-batch traceability and uniform hardness ≥465 HV1

• Supply Reliability: Global distributor network (MF Supply, Würth, STS Industrial) maintains stock of sizes M3–M39 and #5–1½”

• Logistics Capability: Standard packaging enables efficient container loading; available in bulk quantities for enterprise sourcing

• Price Competitiveness: Reduces total cost of ownership by eliminating re-torquing, downtime, and failure-related repairs

• Sustainability Benefits: Delta Protekt® coating is environmentally advanced (ROHS-compliant); long service life reduces waste

• Technical Support: Full user manuals, application guides, and CE certification documentation available

This positions the NL Series as a strategic sourcing decision for enterprises prioritizing operational reliability and risk mitigation.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): Flexible — standard packs of 10 pairs for small orders; bulk pricing available for enterprise volumes

• BULK Option: 20MT (metric tons) available for large-scale industrial projects

• Loading Capacity: Approximately 18–20 MT per 40’HC container (depending on size mix and packaging density)