NSA5149-5

WASHER
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About this product
The NSA5149-5 is a precision flat washer intended for aerospace fastening use. It spreads clamp load, protects mating surfaces and helps maintain consistent preload in bolted assemblies. Manufactured to aviation quality standards and supplied with traceable CofC paperwork, it’s suitable for use wherever a reliable, low-profile bearing is required in aircraft structures and systems.
NSA5149-5 Datasheet
Lead Time: Stock
Certification: MANF COFC
UOM: EA
8130/EASA Eligible: Yes
Hazardous Item: Non-Hazardous Item
PRODUCT DESCRIPTION

NSA5149-5

  • Flat bearing face: Provides even load distribution under nuts and bolt heads.

  • Precision thickness: Manufactured to tight tolerances for predictable clamp behavior.

  • Corrosion-resistant finish: Protective coating or treatment extends service life in aircraft environments.

  • Smooth edges: Prevents cutting or damage to panels, hoses or wiring under the fastener.


  • Under bolt heads on thin sheet panels to prevent pull-through during assembly and flight.

  • Beneath nuts on structural splice joints to spread clamp load over a wider area.

  • In avionics racks under mounting screws are used to protect circuit-card trays from deformation.

  • On hydraulic manifold covers to ensure even sealing pressure around gaskets.


  • What is the primary purpose of this washer?

To distribute clamp load and protect the mating surface under a nut or bolt head.

  • What material is the washer made from?

It is supplied from aviation-grade material and finished for corrosion resistance.

  • How should I inspect the washer before installation?

Check for flatness, intact finish, clean bore and no burrs or cracks.


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