S-92538A183 0.14" ID x 0.5" OD Finishing Washers

Finishing Washers

1278FA00009 Finishing Washers
1278FA00009 Finishing Washers

Image may differ from product. See technical specification for details.

Part No.
Part No. 1278FA00009
Equivalent to mcmaster :
92538A183

Basic Information

System of Measurement Inch
Washer Type Countersunk

Dimension Parameters

ID 0.14"
OD 0.5"
Thickness 0.094-0.114"

Material & Strength Parameters

Material 18-8 Stainless Steel
Hardness Rockwell B83

Installation & Application Parameters

For Screw Size No. 5

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) Compliant
REACH REACH (EC 1907/2006) (01/17/2023, 233 SVHC) Compliant

Geometric Parameters

Countersink Angle 82°
Technical Drawings No drawings available at the moment, will be launched soon
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Key Features & Benefits at a Glance

  • Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
  • Precise 82° countersink angle ensures a flush, professional finish with flat-head screws, reducing snagging and improving safety.
  • Optimized for No. 5 screws with a 0.14" ID for secure fit and a 0.5" OD for excellent load distribution, preventing surface damage.
  • Exceptional durability from Rockwell B83 hardness, providing high resistance to wear and deformation under pressure.
  • Full RoHS 3 & REACH compliance guarantees safe, environmentally responsible use in regulated industries.
  • Consistent dimensional accuracy with thickness ranging 0.094-0.114", ensuring reliable performance in repetitive assembly.
  • Versatile inch system compatibility for seamless integration with standard industrial equipment and fasteners.

Professional Applications & Engineering Value

This 82° countersunk washer is engineered to solve common industrial challenges, such as fastener loosening and material degradation. Made from 18-8 stainless steel, it offers excellent corrosion resistance, making it suitable for demanding applications in marine, chemical processing, and outdoor equipment. The precise countersunk design allows for a smooth, flush surface, reducing aerodynamic drag in machinery and minimizing injury risks in high-traffic areas. Its robust construction and Rockwell B83 hardness ensure it maintains integrity under vibration and load, providing reliable fastening in automotive assemblies, electronic enclosures, and structural frameworks. By using inch system specifications, it integrates effortlessly with existing components, streamlining maintenance and reducing downtime.

Specification Summary & Compliance

This washer features an ID of 0.14", OD of 0.5", and thickness of 0.094-0.114", designed for No. 5 screw size with an 82° countersink angle. Manufactured from 18-8 stainless steel with a hardness of Rockwell B83, it adheres to standard inch measurement tolerances for consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety standards for industrial use.

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