AL-KO Genuine 3T Slotted Axle Castle Nut

Name: AL-KO Genuine 3T Slotted Axle Castle Nut | 1.25" UNF 12 TPI
Brand: Couplemate
SKU: NUT-1.25-inch-UNF-CASTLE-12
Price: 18.57 AUD
Availability: InStock

SKU: NUT-1.25-inch-UNF-CASTLE-12 Category: Axles Tag: 3t axle nut Brand: Couplemate

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$18.57 Inc.GST

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AL-KO Genuine 3T Slotted Axle Castle Nut – 1.25″ x 12 TPI (UNF)

SKU / Part Number: 190008 (Fits Kit 192300)

The AL-KO 1.25-inch 12 TPI Slotted Axle Nut is a heavy-duty, genuine replacement component designed exclusively for 3-tonne (3T) caravan and trailer axle machinings. Engineered from premium, high-tensile steel, this castellated nut ensures a positive locking connection when paired with a heavy-duty split pin, securing your entire hub assembly under severe highway and off-road towing stresses.

Available Purchase Options

Standalone Component: View the official range via the
AL-KO Axle Support Parts Component Directory.
Complete Kit Option: Purchase the full assembly (including this 1.25″ nut, split pin, and custom spacer washer) as a pre-packaged bundle from
Total Trailer Parts (AL-KO Kit 192300).

Detailed Description

When managing heavy-duty haulage up to 3 tonnes, components cannot compromise on security. The AL-KO 1.25″ Slotted Axle Nut is precision-machined with a 1 1/4″ Unified Fine Thread (UNF) profile running at 12 Threads Per Inch (TPI). This engineering standard offers optimized thread engagement to handle intense lateral forces.As a crucial element of the AL-KO 3T axle machining assembly, its castellated design features deep-cut slots along the outer rim. These slots allow precise torque tuning before inserting an AL-KO 6.3mm split pin through the axle stub. This mechanism provides a failsafe positive lock, physically preventing structural back-off during continuous wheel rotation or sharp braking intervals.

Key Features & Technical Specifications

Specification Metric	Product Data Value
Brand / Manufacturer	AL-KO Vehicle Technology
Manufacturer Part Number	190008 (Nut Only) / 192300 (Full Kit)
Thread Diameter	1.25 inches (1 1/4″ / 31.75mm)
Thread Pitch	12 TPI (UNF – Unified National Fine)
Profile Design	Slotted / Castellated (Castle Nut)
Load Rating Capacity	Suits 3,000kg (3 Tonne) Axle Machinings
Companion Components	Requires 6.3mm x 50mm Split Pin (PN: 190006) & 3/16″ Washer (PN: 190020)

Frequently Asked Questions (FAQ)

Will this axle nut fit standard 1.5T or 2T AL-KO axles?

No. Standard AL-KO 1.5-tonne, Parallel, and 2-tonne axle configurations use a smaller 1-inch UNS 14 TPI thread profile (Part Number 190007). This 1.25-inch 12 TPI nut is engineered exclusively for heavy-duty 3-tonne configurations.

Do I need to replace this nut every time I service my wheel bearings?

While the heavy-duty cast steel nut can be cleaned and reused if the threads show no deformation or stripping, the companion split pin must always be discarded and replaced with a fresh pin during reassembly to ensure safety.

Can I install an off-the-shelf industrial washer with this nut?

It is strongly discouraged. The 3T machining setup requires AL-KO’s proprietary heavy-duty washer (Part 190020) featuring dimensions of 1 1/4″ I.D. x 2 3/8″ O.D. x 3/16″ thickness to seat the assembly accurately against the bearing hub.

Regulatory & Compliance Reference Standards

When performing maintenance or altering your heavy trailer running gear within Australia, ensuring structural compliance with commercial safety frames is legally required. Review the statutory regulations below:

Verify maximum vehicle and axle safety thresholds by consulting the national
Australian Department of Infrastructure (Vehicle Regulation Standards).
Ensure compliance with structural trailer component maintenance rules and towing safety guidelines detailed directly inside the
National Transport Commission (Heavy Vehicle National Law) framework.

There are no FAQs for this product.

Additional information

Weight	0.25 kg
Dimensions	50 × 50 × 30 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.