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  • Industrial Flat Washer SAE Plain Finish

USA SAE Flat Washer Thru Hardened with Plain Finish

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If you're looking for a washer that delivers consistent performance under load, the USA-made SAE thru hardened flat washer with a plain finish is an excellent choice. Designed and manufactured to strict SAE standards, these washers offer reliable load distribution and enhanced strength for high-performance bolted connections in industrial, automotive, and heavy machinery applications.

Made from medium carbon steel, each washer is thru hardened—not just surface-treated—to ensure uniform hardness and strength throughout. This heat treatment improves resistance to deformation, embedding, and galling, even under the most demanding torque and pressure conditions.

Material & Finish:

  • Material: Medium carbon steel (SAE J429 compatible)

  • Finish: Plain, uncoated steel – ideal for indoor applications or when a natural metal appearance is required

Dimensions & Tolerances:

  • Outside Diameters: Sized per SAE standard – smaller OD compared to USS washers for a tighter fit around the fastener

  • Inner Diameters: Designed to snugly accommodate SAE bolt sizes

  • Tolerances: Tight manufacturing tolerances for consistent performance and alignment

Mechanical Properties:

  • Hardness: Heat treated to ensure strength and prevent washer crushing under high loads

  • Performance: Maintains bolt preload and clamping force without deformation

Standard Compliance:

  • Manufactured to SAE J995 standards for dimensional and mechanical consistency

  • Made in the USA – supporting domestic quality and manufacturing reliability

Applications:

  • Automotive and truck assemblies

  • Machinery and equipment fabrication

  • Steel framing and industrial maintenance

  • Bolted joints requiring high clamp loads

USA SAE thru hardened washers with a plain finish deliver strength and reliability where it counts. For secure, long-lasting fastening solutions, these washers are an industry favorite. Need guidance on compatibility or sizing? Contact our fastener team—we’re here to help you get the right washer for your application.