S-98370A017 0.344" ID x 0.688" OD Oversized Washers

Oversized Washers

1248FA00705 Oversized Washers
1248FA00705 Oversized Washers

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

Part No.
Part No. 1248FA00705
Equivalent to mcmaster :
98370A017

Basic Information

System of Measurement Inch
Washer Type Flat

Dimension Parameters

ID 0.344"
OD 0.688"
Thickness 0.105-0.130"

Material & Strength Parameters

Material 18-8 Stainless Steel
Hardness Rockwell B83

Installation & Application Parameters

For Screw Size 5/16"

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) Compliant
REACH REACH (EC 1907/2006) (01/17/2023, 233 SVHC) Compliant
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 material, ideal for harsh industrial environments and extending service life.
  • Exceptional mechanical strength due to Rockwell B83 hardness, preventing deformation under high load conditions.
  • Precise dimensional fit with 0.344" ID and 0.688" OD, ensuring reliable performance for 5/16" screw applications.
  • Consistent thickness control between 0.105" and 0.130", providing uniform load distribution and vibration resistance.
  • Full regulatory compliance with RoHS 3 and REACH standards, guaranteeing safety and environmental responsibility.
  • Durable long-term performance in demanding applications, reducing maintenance needs and replacement costs.
  • Broad industrial compatibility with inch system specifications, facilitating easy integration into existing assemblies.

Professional Applications & Engineering Value

This 18-8 stainless steel flat washer delivers critical engineering value by addressing common industrial challenges like corrosion-induced failure and load instability. Its high corrosion resistance makes it suitable for outdoor, marine, or chemical-exposed settings, while the Rockwell B83 hardness ensures it maintains integrity under repetitive stress. The precise 0.344" ID and 0.688" OD dimensions, combined with controlled thickness, provide optimal surface contact and prevent loosening in 5/16" screw size applications. These features make it an essential component in machinery, construction, and automotive assemblies, where reliability and compliance with industrial safety standards are paramount.

Specification Summary & Compliance

This flat washer adheres to inch system measurements with an inner diameter of 0.344", outer diameter of 0.688", and thickness ranging from 0.105" to 0.130". It is designed for 5/16" screw size applications and manufactured from 18-8 stainless steel with a hardness of Rockwell B83. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety requirements for industrial use.

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