HILLMAN Anti-Turn Washer - 1/2-Inch - Silver
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This guide is for anyone needing to secure fasteners against rotation, offering a reliable solution for preventing loosening under vibration or stress. The primary benefit is enhanced joint security. A potential consideration is the specific application suitability for its anti-turn mechanism. The HILLMAN Anti-Turn Washer is designed with inward and/or outward radial serrations that grip the bearing surface, ensuring it stays in place once installed. It is made of high-strength steel and features a mechanically galvanized finish for durability, adhering to ASTM A153 standards.
All features
| Colour | Silver |
|---|---|
| Model Part Number | 290303 |
| Brand | HILLMAN |
Extended Product Information
FAQs
What does 'anti-turn' mean for a washer?
'Anti-turn' refers to the washer's ability to resist rotation. This is achieved through serrations on its surface that grip the material it's placed against, preventing the fastener from loosening due to vibration or stress.
What is the benefit of the serrations?
The serrations dig into the bearing surface (the material the bolt passes through) and the underside of the fastener head, creating a mechanical lock that prevents the fastener from backing out or rotating.
What does ASTM A153 conformance signify?
ASTM A153 is a standard specification for hot-dip zinc coating (galvanizing) on iron and steel hardware. Conformance indicates the washer has met specific quality and coating requirements for corrosion protection.
Can this washer be used on wood surfaces?
Yes, it can be used on wood, but it is most effective on harder materials where the serrations can bite securely. On very soft wood, the serrations might not engage as deeply, potentially reducing their effectiveness compared to metal surfaces.
How do I choose the right size?
The size, such as 1/2-inch, typically refers to the intended bolt or screw diameter it is designed to be used with. Ensure the hole diameter is also compatible. It should fit snugly around the fastener.
Is this washer reusable?
While it can be removed, the serrations may cause damage to the surfaces they bite into. For critical applications where a secure lock is essential, using new washers for reassembly is often recommended to ensure full effectiveness.
What does 'mechanically galvanized' mean compared to hot-dip galvanizing?
Mechanically galvanizing involves applying a zinc coating through mechanical means (like tumbling parts in a solution). It often results in a more uniform coating and less risk of hydrogen embrittlement compared to hot-dip galvanizing, especially for smaller fasteners.
Troubleshooting
Washer appears loose after installation
Ensure the fastener was tightened sufficiently for the serrations to engage. Check that the mating surfaces are not excessively soft or uneven, which could prevent proper biting. Verify the washer is the correct size for the fastener and hole.
Difficulty removing fastener
This is an intended function of the anti-turn mechanism. Apply steady, firm torque with the appropriate tool. If resistance is extreme, the serrations have performed their job effectively. Ensure you are using the correct size wrench or socket.
Corrosion observed on washer
While mechanically galvanized, prolonged exposure to harsh environments can still lead to corrosion. Clean the affected area gently with a wire brush and consider applying a rust inhibitor if the washer is still functional but showing minor surface rust.
Pros and Cons
Pros
- Effectively prevents fastener rotation and loosening.
- Constructed from high-strength steel for durability.
- Mechanically galvanized finish provides good corrosion resistance.
- Conforms to ASTM A153 standards, ensuring quality.
- Easy to install, requiring no special tools.
Cons
- May not be suitable for all material types or very soft surfaces where deep biting is not desired.
- Specific size (1/2-inch) limits application to compatible bolt and hole sizes.
- Once installed and tightened, removal might require more force due to the biting action.
Setup, Compatibility & Care
Setup:
- Select the appropriate washer size (1/2-inch in this case) that matches your bolt or screw diameter and the hole size.
- Place the anti-turn washer onto the bolt or screw before insertion.
- Tighten the fastener as usual. The serrations will engage with the surfaces to prevent rotation.
Compatibility:
- Compatible with standard 1/2-inch bolts and screws.
- Suitable for use with various materials, though most effective on harder surfaces like metal or dense wood where the serrations can bite.
- Ensure the mating surfaces are clean for optimal grip.
Care:
- The mechanically galvanized finish offers good corrosion resistance.
- For long-term outdoor use, periodic inspection for rust or damage is recommended.
- Clean with a dry or slightly damp cloth if dust accumulates. Avoid abrasive cleaners.