Grade 8 Thru-Hardened Yellow Zinc USS Flat Washers
What are Grade 8 thru-hardened yellow zinc USS washers? Grade 8 thru-hardened yellow zinc USS flat washers are high-strength, heat-treated wide-pattern washers with a yellow zinc plating. The thru-hardening lets them resist the concentrated load of Grade 8 bolts without deforming, while the wide USS pattern spreads that load over a broad surface.
Why use a thru-hardened washer with Grade 8 bolts?
High-strength Grade 8 bolts generate high clamping force that can dent, dish, or embed an ordinary soft washer, which loses preload and weakens the joint. A thru-hardened washer is heat-treated all the way through so it resists that deformation, spreading the load properly and holding tension. The wide USS pattern adds a broad bearing surface, and the yellow zinc plating gives corrosion resistance while signaling the higher-strength grade. Always pair a Grade 8 washer with Grade 8 bolts so the whole joint is balanced.
Why choose Grade 8 thru-hardened yellow zinc USS washers
- High strength: thru-hardened to resist deformation under Grade 8 bolts.
- Preserves preload: will not dish and lose clamping force.
- Wide bearing: USS pattern spreads load over a broad surface.
- Yellow zinc: corrosion resistance and a high-strength cue.
Common applications for Grade 8 thru-hardened USS washers
- Grade 8 high-strength bolted joints
- Heavy machinery and equipment
- Structural and high-load connections
- Automotive and trailer suspension work
For a plain finish, see Grade 8 thru-hardened plain steel USS flat washers, and browse every option on the main flat washers category.
Grade 8 Thru-Hardened Yellow Zinc USS Washers FAQ
What does thru-hardened mean?
The washer is heat-treated all the way through, not just on the surface, so it resists deformation under the high clamping load of Grade 8 bolts.
Why not use a standard washer under a Grade 8 bolt?
A soft washer can dish or embed under the high force, losing preload and weakening the joint. A thru-hardened washer holds up.
Why is the zinc yellow?
Yellow zinc plating offers more corrosion resistance than clear zinc and commonly signals a higher-strength grade, making Grade 8 washers easy to identify.