S-92856A120 0.156" ID x 0.75" OD Dished Washers

Dished Washers

1290FA00007 Dished Washers
1290FA00007 Dished Washers

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

Part No.
Part No. 1290FA00007
Equivalent to mcmaster :
92856A120

Basic Information

System of Measurement Inch
Washer Type Cup for Oversized Holes

Dimension Parameters

ID 0.156"
OD 0.75"
Thickness 0.030-0.065"
Overall Height 0.167"
Diameter (A) 0.3"
Diameter (B) 0.468"

Material & Strength Parameters

Material Zinc-Plated Steel
Hardness Rockwell B75

Installation & Application Parameters

For Screw Size No. 6

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
  • Reliable oversized hole compensation with 0.156" ID and 0.75" OD, preventing screw pull-through and improving joint integrity
  • Enhanced load distribution from the cup design, reducing surface pressure and material deformation under stress
  • Consistent performance ensured by Rockwell B75 hardness, maintaining dimensional stability under vibration and torque
  • Environmental compliance with RoHS 3 standards, meeting global regulatory requirements for hazardous substance restrictions
  • Precision fit for No. 6 screws in inch system applications, streamlining assembly processes and reducing installation errors
  • Durable thickness range (0.030-0.065") providing flexibility for varying gap and compression needs in mechanical assemblies

Professional Applications & Engineering Value

This zinc-plated steel cup washer is engineered to address common challenges in oversized hole applications, where standard washers fail to provide adequate bearing surface. The cup design encapsulates the screw head, distributing clamp load evenly and preventing sinkage into soft materials or sheet metal. Its Rockwell B75 hardness ensures the washer resists deformation under high torque, maintaining seal integrity in vibratory environments like automotive chassis, electrical enclosures, and machinery frames. The zinc plating offers a sacrificial layer against oxidation, crucial for outdoor or humid settings, while the precise 0.156" ID and 0.75" OD dimensions cater to No. 6 screws in inch-based assemblies, reducing rework and enhancing production efficiency.

Specification Summary & Compliance

This cup washer adheres to inch system dimensional standards, with an inner diameter of 0.156" and outer diameter of 0.75" for compatibility with No. 6 screw sizes. The thickness range of 0.030-0.065" and overall height of 0.167" ensure precise fit in varied gap conditions. Manufactured from zinc-plated steel with a Rockwell B75 hardness rating, it meets general industrial strength requirements. The product is fully RoHS 3 (2015/863/EU) compliant, confirming absence of restricted hazardous substances, and is suitable for applications demanding corrosion resistance and durability.

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