Stud – M12 – Industrial Knurl
Price
$2.75 Inc.GST
Shipping
M12 x 1.5 Industrial Knurl Wheel Stud – 51mm Length (Gold Zinc Plated)
Featuring a premium gold zinc-plated finish and an aggressive 15.5mm industrial-strength knurl, this 51mm press-in replacement stud delivers exceptional corrosion resistance and a rock-solid mechanical lock inside the hub flange to eliminate spinning.
Product Overview
Built for maximum durability and effortless integration, this 51mm high-tensile alloy steel stud is ideal for demanding 1.5-tonne trailer applications, marine setups, and 4WD configurations. The specialised gold zinc plating functions as a robust sacrificial barrier, insulating the core high-tensile metal against rust, moisture, and corrosive road salts. This makes it an ideal upgrade for harsh environments where standard bare-metal studs quickly fail.
The defining feature of this high-performance stud is its deep, aggressive industrial knurl. By providing an enlarged contact area within the hub flange, it creates a permanent interference fit that bites directly into the hub material. This prevents the stud from breaking loose or spinning inside the seat when applying extreme torque during wheel changes. Designed with a standard metric M12 x 1.5 thread pitch, it seamlessly matches the vast majority of modern trailer lug nuts and passenger vehicle wheels.
Purchase & Support Links
Browse Hub Wheel Studs at Couplemate Trailer Parts
Visit the official AL-KO Australia Hub Component Support
Key Features
- Premium Gold Zinc Finish: Delivers advanced corrosion protection, making it perfect for marine boat trailers and high-end chassis.
- Industrial Knurl Design: The 15.5mm knurl provides an extended interference fit area to eliminate spinning stud errors.
- High-Tensile Strength: Forged from premium alloy steel to handle severe shear loads and clamping pressures.
- Standard Metric Thread: Precise M12 x 1.5 thread design ensures compatibility with standard wheels and nuts.
Technical Specifications
| Measurement Property | Technical Parameter Details |
|---|---|
| Thread Size & Pitch | M12 x 1.5 (Metric Thread) |
| Total Length | 51 mm |
| Knurl Length | 15.5 mm |
| Surface Finish | Premium Gold Zinc Plated |
| Material Composition | High-Tensile Alloy Steel |
| Fitment Design | Interference Fit / Press-in Style |
| Load Application | Up to 1.5-Tonne & Heavy-Duty 4WD Hub Assemblies |
Frequently Asked Questions
Q: Why is a longer 15.5mm knurl length important for trailer hubs?
A: The extended 15.5mm knurl length maximises the contact surface area inside the hub flange wall. This distribution of physical friction prevents the stud from stripping out the inner hub hole and spinning during high-torque tightening cycles.
Q: Can I use this stud for standard marine boat trailer setups?
A: Yes. The specialised gold zinc plating provides an enhanced rust barrier that easily outperforms standard black oxide or raw steel studs when regularly exposed to moisture and boat ramp conditions.
Q: What should I do if my existing hub hole is worn out or loose?
A: If the hole inside your hub has been enlarged or rounded out by a spinning stud, a standard press-in stud may not secure properly. For safety, the hub should be structurally assessed or replaced entirely to guarantee a reliable interference lock.
Australian Roadway Engineering & Safety Compliance
Trailer wheels, hubs, and safety fasteners must conform to strict roadworthiness criteria in Australia. Ensure your trailer assembly complies with all current regulatory frameworks before hitches meet public roads:
- Review critical component safety requirements via the federal Australian Vehicle Standards Bulletin 1 (VSB1).
- Consult general heavy vehicle equipment safety mandates via the National Heavy Vehicle Regulator (NHVR).
- Access state-specific compliance resources at the Transport for NSW Caravan and Light Trailer Hub or the VicRoads Safe Towing Guidelines.
There are no FAQs for this product.
Additional information
| Weight | 0.1 kg |
|---|---|
| Dimensions | 1 × 5 × 1 cm |
Our Service Lifetime Warranty
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
Couplemate™ is a manufacturer and vendor of high-quality towing, trailer, and caravan components. Couplemate™ Core Goods and Custom Work are guaranteed to be free of defects for the service lifetime of the product when used as intended.
Warranties are non-transferrable and Couplemate™ requires satisfactory proof of purchase prior to issuing a remedy. The full Couplemate™ Warranty Policy can be found in the Terms & Conditions: Section 8 – Consumer Guarantees & Warranty.
Warranties are in addition to your rights under the Australian Consumer Law. If something is wrong with your order, please contact our team.
60-Day Returns
After 60 years of experience, we know that life has its unpredictable moments.
All Couplemate™ orders (online, over the phone, or in-store) have a 60 day period for change-of-mind returns and exchanges. There are some items that can’t be returned and some returns may incur a 15% restocking fee.
You can view our full policy for change-of-mind returns here.
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