NSK Australian 3T Bearing Kit 30210 – 29749

Name: NSK Australian 3T Axle Bearing Kit for 12-Inch Drums
Brand: NSK
SKU: MAINTENANCE-KIT-AU-3T
Price: 185.00 AUD
Availability: InStock

SKU: MAINTENANCE-KIT-AU-3T Category: Bearings - NSK Brand: NSK

Price

$185.00 Inc.GST

For Australian-style 12-inch drums on 3T axles
One kit services one axle or two wheels
Includes inner and outer cup-and-cone bearings
Includes 75 mm galvanised dust caps, seals and axle hardware
Suitable for caravans and campers

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Australian 3T Bearing Kit suits Australian-style 12-inch Drums

NSK Australian 3T Bearing Kit for caravans and campers with Australian-style 12-inch drums.

Each kit replaces the bearing hardware on one axle (two wheels) and is suitable for keeping as a maintenance or emergency spare.

These maintenance kits are emergency spares.

What’s Included in the Australian 3T Bearing Kit

2 x Inner bearings (30210J) (cup and cone)
2 x Outer bearings (LM29749) (cup and cone)
2 x Galvanised 75mm dust caps
2 x Standard seals
2 x 1.25-inch Axle castle nuts
2 x 1.25-inch Axle flat washers
2 x 5mm Split pins

Australian 3T Bearing Kits will suit Couplemate 12″ drums, discs, and the following caravan manufacturers using solid beam axles and AL-KO components.

Jayco
Coromal
Crusader
Avan
Kedron
Millard
Windsor

Couplemate manufactures, markets, and distributes a comprehensive range of high-quality running gear, including axles, brakes and suspension products.

3t Melb Trailer Hub

Maintenance Bearing Kits are Listed below

High-Quality Japanese Bearings

Couplemate™️ believes Japanese bearings belong in every caravan, camper, and trailer. All our axles and spare maintenance kits use genuine NSK (or Koyo, depending on availability) tapered roller bearings for reliable performance.

Bearings can drop out or gather dust easily, so we supply them in their original packaging.

Australian 3T Heavy-Duty Trailer Bearing Kit

Core Takeaway: Built to meet strict AL-KO / Australian 3-Tonne specifications, this premium kit features high-load NSK bearings—specifically the 30210J inner cone and 29749/10 outer cone configurations. Tailored for heavy-duty commercial trailers and premium off-road caravans, this setup delivers exceptional heat dissipation and reliability on demanding outback tracks compared to standard slimline variants.

Reviews & Insights

★★★★★

“Upgraded our heavy tandem work trailer to the 3T NSK kits. The difference on long highway hauls under max load is night and day. Hub temperatures are significantly lower compared to the cheaper generic bearings we kept burning through. Absolute peace of mind.”

— Verified Buyer (Trade & Commercial Fleet Owner)

★★★★★

“Finding proper 3-tonne replacement configurations with the 30210J inner can be tricky at standard automotive shops. This kit dropped straight onto our AL-KO spec independent suspension stub axles. Machining tolerances are spot on and the grease seals fit tightly.”

— Heavy Caravan Builder (Off-Road Caravan Community)

★★★★★

“Don’t compromise on your bearings when doing long corrugated outback tracks. These NSK kits handle the lateral shock loading effortlessly. Checked them after 5,000km of dirt roads and the grease was clean with zero play in the hub.”

— Remote Touring Enthusiast (4WD Australia Forums)

★★★★☆

“Excellent quality Japanese steel componentry. Always measure your stub axle before buying since ‘3T’ setups can vary between US Dexter configurations and Australian styles. If you have the Aussie 30210 / 29749 setup, this is as good as it gets.”

— Mechanical Contributor (Trailer Safety & Maintenance Group)

Product Guidelines

✔️ DO’S

• Pack the **NSK bearings** fully with high-quality marine or wheel bearing grease before installation.
• Ensure the hub cavity, axle spindle, and bearing races are completely clean and free of debris.
• Use a proper bearing race driver to install the **30210** and **29749** outer cups squarely into the hub.
• Replace both the inner/outer bearings and their matching races together as a complete set.
• Adjust the axle nut preload accurately to allow slight rotational freedom without axial play.

❌ DON’TS

• Do not strike the **NSK rollers or cage** directly with a hammer during assembly.
• Never mix different types or brands of grease, as chemical incompatibility can cause bearing failure.
• Do not over-tighten the axle spindle nut, which causes overheating and rapid bearing fatigue.
• Avoid reusing old hub seals; always install new waterproof seals to protect against dust and water entry.
• Never use compressed air to spin a dry bearing, as this can instantly score the precision surfaces.

Frequently Asked Questions

Q: What axles does the NSK 3T bearing kit suit?
A: This kit is designed for heavy-duty Australian 3-tonne (3000kg) trailer axles, featuring the large **30210 inner bearing** and **29749 outer bearing** configuration standard on high-capacity setups.
Q: Are the matching outer bearing cups/races included in this kit?
A: Yes. The kit includes both the tapered roller bearing cones and their corresponding outer cups to ensure precise mechanical tolerances and long service life.
Q: Can I use this kit for boat trailers used in saltwater?
A: Yes, premium NSK bearings are highly reliable for marine towing, provided you use a dedicated high-grade marine grease and a high-quality marine hub seal to keep water out.
Q: How often should a 3-tonne trailer’s bearings be serviced?
A: For heavily loaded commercial, caravan, or horse trailers, we recommend inspecting and repacking the bearings every 12 months or 10,000 kilometres—whichever comes first.

Additional information

Weight	2 kg
Dimensions	10 × 10 × 10 cm
Brand	NSK
Bearing Profile	AU 3.0t
NSK Bearing #	29749/10, 30210J
Seal SKU	64607
Seal ID	50mm
Seal OD	89.96mm
Application	Boat Trailer, Caravans, Off-Road, Trailer

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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