• Preload stability throughout the entire service life
    Maintains and stabilizes the preload despite embedding, creeping, and relaxation processes—not just protection against loosening.
  • Multifunctionality instead of conflicting objectives
    Combines resistance to loosening (elastic resilience) and resistance to unscrewing in a single system—instead of the functional limitations of traditional securing elements.
  • Increased slip resistance and operational reliability
    Improves load transfer and increases protection against slip and the connection coming apart.
  • Predictable and designable in accordance with VDI 2230
    Defined resilience and residual spring force enable a reproducible, standards-compliant design of the bolted joint.
  • Reliable under dynamic and real-world operating conditions
    Secures bolted joints even under vibrations, varying loads, and limit stresses.
  • Assembly- and cost-efficient system design
    Reduces component variety, optimizes material usage, and sustainably lowers total and process costs while increasing operational reliability.

NSK – Multifunctional Safety for Mechanical Screw Connections

1. Lifecycle-Oriented Preload Stability

  • Stabilization of the preload force throughout all phases of the bolted joint
    (Assembly → Embedding → Relaxation → Operation)
  • Reduction of set, creeping, and relaxation losses
  • Prevention of critical preload force drops
  • Ensuring the required clamping force throughout the service life
  • Expansion of the safety approach from purely preventing loosening to systemic preload stability

2. Multifunctional system safety without conflicting objectives

  • Multifunctionality as the central operating principle: Combination of anti-loosening and anti-rotation protection in a single system
  • Simultaneous force-locking, form-locking, and friction-locking effects
  • Resolving the conflict of objectives in conventional locking systems
  • Integration of multiple mechanisms of action instead of focusing on individual principles

3. Increased slip resistance and operational safety

  • Increase in usable frictional locking reserve
  • Increased protection against slip and opening
  • Improved force distribution within the connection
  • Stabilization of overall mechanical function
  • Support for system function, not merely securing against relative rotational movement

4. System flexibility and load distribution

  • Increased resilience of the screw system
  • Improved load distribution between the screw and clamping parts
  • Optimized pressure distribution through radial geometry with two contact points
  • Reduction of screw load
  • Protective effect during short-term overloading through elastic energy absorption
  • Active system support instead of purely passive securing effect

5. Calculability and standard-compliant design (VDI 2230)

  • Defined resilience and residual spring force in accordance with DIN 267-26
  • Incorporation into the design according to VDI 2230
  • Reproducible friction coefficients for reliable assembly processes
  • Technically controllable and designable system behavior
  • Integration into the structural system design rather than purely additive securing elements

6. Functional safety under real operating conditions

  • Proven resistance to loosening under dynamic transverse loads
    (DIN 65151, DIN 25201-4)
  • Effectiveness during embedding, creeping, and relaxation processes
  • Resistance to vibrations and alternating loads
  • Stabilization even at reduced preload levels
  • Comprehensive effectiveness across real operating conditions

7. Assembly and Process Reliability

  • One-piece system → no loss of parts / no mix-ups
  • Simple and secure assembly
  • Reduction of assembly errors
  • High process reliability in production and maintenance
  • System integration reduces interfaces and sources of error

8. Cost-Effectiveness and System Integration

  • Reduction in Total Cost of Ownership
  • Reduction in maintenance and repair costs
  • Minimization of downtime risks
  • Potential for weight and component optimization
  • Multifunctionality reduces the number of components and system complexity

Summary

NSK stands for multifunctionality in screw locking.

  • Expanding beyond traditional anti-loosening protection to achieve systematic preload stability
  • Integration of multiple mechanisms of action into a single fastener
  • Increased functional reliability over the entire life cycle
  • Technically calculable, standards-compliant, and cost-effective

NSK doesn’t just secure screws—NSK secures the function of the connection

  • Maintenance-free & Long-term stability
    Constant contact pressure throughout the lifetime prevents loss of function.
  • System stability rather than mere resistance to loosening
    The combination of resistance to loosening and resistance to unscrewing ensures consistently low transition resistance and stable electrical performance.
  • High energy efficiency & thermal safety
    Low Joule losses reduce heating and increase operational safety.
  • Stable preload force = operational reliability
    Compensation for settlement and relaxation effects ensures a constant preload force under all conditions.
  • Multifunctionality instead of compromises
    Combines locking, contact pressure, preload force, and corrosion protection in a single solution.
  • Robust and cost-effective system solution
    One-piece design, process-reliable, and durable without additional resistors, at reduced costs.

NSK – Securing Electrical Screw Connections

1. Maintenance-free & Long-term stability

  • Stable contact pressure over the entire lifetime
  • Compensation for settlement, creeping, and relaxation effects
  • Prevention of loss of preload and re-tightening
  • Basis for permanently secure and low-maintenance connections

2. System stability instead of mere resistance to loosening

  • Permanently low transition resistance due to stable minimum contact force (FCmin)
  • Ensuring electrical functionality over time
  • Prevention of electrothermal instability (zTEM)

3. Energy efficiency & thermal safety

  • Reduced Joule losses (I²R)
  • Lower heating and increased operational safety
  • Stable operation even at high current densities

4. Stable preload force as the basis for functional safety

  • Increased elastic resilience
  • Compensation for settlement, creeping, and relaxation effects
  • Defined residual spring force (DIN 267-26)
  • Stability over time, temperature, and under dynamic loads

5. Multifunctionality as a system principle (USP)

  • Combines all functionally relevant mechanisms in a single component and resolves the trade-off inherent in conventional fastening systems (loosening vs. unscrewing vs. corrosion):
    → Preload stability
    → Anti-loosening protection
    → Contact pressure protection
    → Corrosion resistance

6. System solution developed specifically for electrical applications

  • Single-piece contact and securing element → minimal interface surfaces
  • Undamaged contact surfaces → stable transition resistance
  • Wide-area, uniform pressure distribution → homogeneous transfer current
  • Defined coefficient of friction → defined contact pressure
  • Active spring effect → stable preload retention with A4 stainless steel
  • Reliable anti-rotation protection → contact pressure maintained under vibration
  • Integrated A4 corrosion protection → permanently stable contact zone
  • All-in-one principle → electrical, mechanical, and corrosion resistance
  • Fastening solution for holes and slotted hole geometries
  • Optimal solution for the use of non-magnetic NIRO fasteners at > 6300 A

Summary

NSK stands for multifunctionality in screw locking.

  • Expanding beyond traditional anti-loosening protection to achieve systematic preload stability
  • Integration of multiple mechanisms of action into a single fastener
  • Increased functional reliability over the entire life cycle
  • Technically calculable, standards-compliant, and cost-effective

NSK doesn’t just secure screws—NSK secures the function of the connection

  • Preload stability throughout the entire service life
    Maintains and stabilizes the preload despite embedding, creeping, and relaxation processes—not just protection against loosening.
  • Multifunctionality instead of conflicting objectives
    Combines resistance to loosening (elastic resilience) and resistance to unscrewing in a single system—instead of the functional limitations of traditional securing elements.
  • Increased slip resistance and operational reliability
    Improves load transfer and increases protection against slip and the connection coming apart.
  • Predictable and designable in accordance with VDI 2230
    Defined resilience and residual spring force enable a reproducible, standards-compliant design of the bolted joint.
  • Reliable under dynamic and real-world operating conditions
    Secures bolted joints even under vibrations, varying loads, and limit stresses.
  • Assembly- and cost-efficient system design
    Reduces component variety, optimizes material usage, and sustainably lowers total and process costs while increasing operational reliability.

NSK Screw Locking Systems

1. Lifecycle-Oriented Preload Stability

  • Stabilization of the preload force throughout all phases of the bolted joint
    (Assembly → Embedding → Relaxation → Operation)
  • Reduction of embedding, creeping, and relaxation losses
  • Prevention of critical preload force drops
  • Ensuring the required clamping force over the service life
  • Expansion of the safety concept from pure anti-loosening protection to systemic preload stability

2. Multifunctional system safety without conflicting objectives

  • Multifunctionality as the central operating principle: Combining protection against loosening and protection against unscrewing in a single system
  • Simultaneous force-locking, form-locking, and friction-locking effects
  • Resolution of the conflict of objectives in classic locking systems
  • Integration of multiple mechanisms of action instead of focusing on individual principles

3. Increased slip resistance and operational safety

  • Increase in usable frictional lock reserve
  • Increased protection against slipping and unfastening
  • Improved force distribution within the connection
  • Stabilization of overall mechanical function
  • Support for system function, not just securing against relative rotational movement

4. System flexibility and load distribution

  • Increased resilience of the screw system
  • Improved load distribution between the screw and clamping parts
  • Optimized pressure distribution through radius geometry with two contact points
  • Reduction of screw load
  • Protective effect during short-term overloading through elastic energy absorption
  • Active system support instead of purely passive locking action

5. Calculability and standard-compliant design (VDI 2230)

  • Defined resilience and residual spring force in accordance with DIN 267-26
  • Incorporation into the design according to VDI 2230
  • Reproducible friction coefficients for reliable assembly processes
  • Technically controllable and designable system behavior
  • Integration into the structural system design rather than purely additive securing elements

6. Functional safety under real-world operating conditions

  • Proven resistance to loosening under dynamic transverse loads
    (DIN 65151, DIN 25201-4)
  • Effectiveness during embedding, creeping, and relaxation processes
  • Resistance to vibrations and alternating loads
  • Stabilization even at reduced preload levels
  • Comprehensive effectiveness across real operating conditions

Summary

NSK stands for multifunctionality in screw locking.

  • Expanding beyond traditional anti-loosening protection to achieve systematic preload stability
  • Integration of multiple mechanisms of action into a single fastener
  • Increased functional reliability over the entire life cycle
  • Technically calculable, standards-compliant, and cost-effective

NSK doesn’t just secure screws—NSK secures the function of the connection

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