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ONOKATSU SUS304 Stainless Steel Extra Thick Flat Washer Japan Quality
Japan Quality Manufacturing
Produced by a Japanese washer manufacturer using high-grade SUS304 stainless steel. Precision-made and highly reliable. Product Overview
ONOKATSU Extra Thick Flat Washers are heavy-duty SUS304 stainless steel washers built for high-load applications. When a high-strength bolt is tightened to high torque, a standard-thickness washer can be undersized for the load at the bearing surface — this washer\'s added thickness increases rigidity and improves the stability and durability of the fastened joint. It also works well as a precision spacer for fine height adjustment when assembling machine parts.
About ONOKATSU
Key Benefits High-Load Bearing Support Reinforces the bearing surface when high-strength bolts are tightened to high torque, where standard-thickness washers fall short. Added Rigidity & Stability The extra-thick cross-section increases joint rigidity, improving long-term stability and durability. Precision Spacer Use Also usable as a spacer for fine height adjustment when assembling machine parts. Made Entirely in Japan Manufactured from Japanese steel and processed by Japanese washer manufacturers for consistent quality. Genuine SUS304 Material Fully compliant, standard-grade stainless steel — not an equivalent substitute. Available Sizes (Variation Options)
Select your preferred size from the variation menu above.
Size Variation Reference (inch) M6(1/4):ID6.5mm×OD13mm×T2.0mmID 0.26\" × OD 0.51\" × T 0.08\" M6(1/4):ID6.5mm×OD13mm×T3.0mmID 0.26\" × OD 0.51\" × T 0.12\" M8(5/16):ID8.5mm×OD18mm×T3.0mmID 0.33\" × OD 0.71\" × T 0.12\" M8(5/16):ID8.5mm×OD18mm×T4.0mmID 0.33\" × OD 0.71\" × T 0.16\" M8(5/16):ID8.5mm×OD18mm×T5.0mmID 0.33\" × OD 0.71\" × T 0.20\" M10(3/8):ID10.5mm×OD22mm×T2.5mmID 0.41\" × OD 0.87\" × T 0.10\" M10(3/8):ID10.5mm×OD22mm×T3.0mmID 0.41\" × OD 0.87\" × T 0.12\" M10(3/8):ID10.5mm×OD22mm×T4.0mmID 0.41\" × OD 0.87\" × T 0.16\" M12(1/2):ID12.5mm×OD26mm×T3.0mmID 0.49\" × OD 1.02\" × T 0.12\" M12(1/2):ID12.5mm×OD26mm×T4.0mmID 0.49\" × OD 1.02\" × T 0.16\" M12(1/2):ID12.5mm×OD26mm×T5.0mmID 0.49\" × OD 1.02\" × T 0.20\" M16(5/8):ID17.0mm×OD32mm×T4.0mmID 0.67\" × OD 1.26\" × T 0.16\" M20(3/4):ID21.0mm×OD40mm×T4.0mmID 0.83\" × OD 1.57\" × T 0.16\" M20(3/4):ID21.0mm×OD40mm×T5.0mmID 0.83\" × OD 1.57\" × T 0.20\" Spec Sheet Tap to enlarge × Related Products < > M3/M4/M5 Fender Washer < > M6/M8 Fender Washer < > M10/M12/M16 Fender Washer Notes
- Please confirm the dimensions before purchase.
- Because this washer is manufactured by precision punching press, the cross-section has a slight taper; see the reference values in the specification table.
- Finish: Barrel polished (dry).
- Product photos are representative images.
- All items ship from Osaka, Japan with tracking.
ONOKATSU Japanese Quality Fasteners | Shipped from Osaka, Japan
