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Description
xThese Extra Thick Flat Washers are designed to meet the demanding needs of heavy-duty applications. Manufactured from Grade 8 steel, these washers are thru-hardened to deliver exceptional strength and durability, resisting deformation under extreme loads. The yellow zinc plating provides superior corrosion resistance, making them ideal for both indoor and outdoor applications. Conforming to USS (United States Standard) dimensions, these washers have a larger outside diameter than SAE-type washers, distributing load more effectively over a wider surface area.
These washers are extra thick, providing a greater bearing surface and spacing than standard washers, reducing galling and surface damage. Ideal for use in high-strength bolted assemblies, machinery, structural joints, heavy equipment, and other industrial applications.
✅ Key Features:
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Material: Medium carbon steel, Grade 8
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Hardness: Thru-hardened (typically Rockwell C38–45)
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Finish: Yellow Zinc Plated for corrosion resistance
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Standard: USS (larger OD than SAE)
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Applications: Structural, heavy equipment, automotive, construction
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Compliance: SAE J429 Grade 8, ASTM F436 (material spec)
| Washer Size | Inner Diameter (ID) | Outer Diameter (OD) | Thickness (Extra Thick) | Material Hardness | Tensile Strength | Finish |
|---|---|---|---|---|---|---|
| 1/4" | 9/32" (0.281") | 5/8" (0.625") | 0.125" – 0.135" | HRC 38–45 | ≥150 ksi | Yellow Zinc (Zinc Chromate) |
| 5/16" | 11/32" (0.344") | 11/16" (0.688") | 0.135" – 0.145" | HRC 38–45 | ≥150 ksi | Yellow Zinc |
| 3/8" | 13/32" (0.406") | 7/8" (0.875") | 0.150" – 0.165" | HRC 38–45 | ≥150 ksi | Yellow Zinc |
| 1/2" | 17/32" (0.531") | 1-1/4" (1.250") | 0.170" – 0.200" | HRC 38–45 | ≥150 ksi | Yellow Zinc |
| 5/8" | 11/16" (0.688") | 1-1/2" (1.500") | 0.200" – 0.220" | HRC 38–45 | ≥150 ksi | Yellow Zinc |
| 3/4" | 13/16" (0.813") | 1-3/4" (1.750") | 0.220" – 0.250" | HRC 38–45 | ≥150 ksi | Yellow Zinc |
| 1" | 1-1/16" (1.062") | 2-1/2" (2.500") | 0.250" – 0.300" | HRC 38–45 | ≥150 ksi | Yellow Zinc |
Note: Exact thickness may vary slightly depending on manufacturer tolerances.
🛠️ Applications:
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Heavy machinery assembly
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Structural steel fastening
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Industrial equipment
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Agricultural machinery
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Automotive frames and suspensions
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