S-92538A841 0.281" ID x 1.25" OD Finishing Washers

Finishing Washers

1278FA00020 Finishing Washers
1278FA00020 Finishing Washers

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

Part No.
Part No. 1278FA00020
Equivalent to mcmaster :
92538A841

Basic Information

System of Measurement Inch
Washer Type Countersunk

Dimension Parameters

ID 0.281"
OD 1.25"
Thickness 0.271-0.291"

Material & Strength Parameters

Material 18-8 Stainless Steel
Hardness Rockwell B83

Installation & Application Parameters

For Screw Size 1/4"

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 100°
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 with 18-8 stainless steel construction, ideal for harsh environments and extending service life.
  • Precise 100° countersink angle ensures a flush, secure fit with matching screw heads, reducing snagging and improving safety.
  • Optimized dimensions (1.25" OD, 0.281" ID) provide reliable load distribution for 1/4" screws, minimizing surface damage.
  • Enhanced durability from Rockwell B83 hardness, offering excellent wear resistance and deformation prevention under stress.
  • Strict compliance with RoHS 3 and REACH regulations, ensuring safe, environmentally responsible use in global markets.
  • Consistent thickness (0.271-0.291") guarantees uniform performance and ease of installation in repetitive assemblies.
  • Versatile inch system compatibility for seamless integration with standard industrial equipment and fastening systems.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 100° countersunk washer tackles common challenges like vibration loosening and surface indentation. The 18-8 stainless steel material delivers exceptional corrosion resistance, crucial for outdoor, marine, or chemical-exposed applications where rust compromises integrity. Its precise countersink angle and 1.25" OD work together to distribute clamp load evenly, preventing sinkage into soft materials and maintaining a smooth finish. Ideal for machinery, automotive, and structural assemblies, this washer ensures long-term reliability by resisting wear and environmental degradation, reducing maintenance costs and downtime.

Specification Summary & Compliance

This washer features inch-based dimensions with an ID of 0.281", OD of 1.25", and thickness range of 0.271-0.291", designed for 1/4" screw size and manufactured to standard inch system tolerances. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its safety and environmental adherence. The Rockwell B83 hardness ensures consistent performance, supporting reliable use in precision industrial applications.

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