# 1616 Dunbier Axle 50 Square Hydraulic Brake 2170mm (85.5") | Marine Trailer Part

🔧 Product Description

  

Dunbier 50mm Square Hydraulic-Brake Axle 2170mm (85.5") - Part Number: 1616

  

A 50mm square straight boat-trailer axle configured for hydraulic disc brakes braking and an overall length of approximately 2170mm / 85.5". The assembly combines the axle beam, bearing journals and the appropriate disc/hub and brake hardware for the specified system.

  

⚙️ Key Features

  

• 50mm square axle construction

• Straight axle geometry

• Overall axle length approximately 2170mm / 85.5"

• Configured for hydraulic disc brakes

• Designed for galvanised marine-trailer suspension and hub systems

• Ford five-stud disc/hub pattern where fitted

• Complete brake configuration should be matched to the trailer coupling and actuation system

  

📏 Specifications

  

• Beam section: 50mm square

• Overall length: Approximately 2170mm / 85.5"

• Indicative chassis/spring-centre width: Approximately approximately 1725mm

• Brake or hub configuration: hydraulic disc brakes

• Wheel/hub pattern: Ford five-stud disc/hub pattern where fitted

• Slimline bearing family: Inner L68149 cone with L68110 cup

• Slimline bearing family: Outer LM12749 cone with LM12710 cup

• Standard rear seal commonly catalogued as Dunbier 1706

• Marine seal alternative commonly catalogued as Dunbier 1716 where the hub and journal suit

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 1616

• Ford-pattern hub and wheel hardware is commonly used on these Dunbier brake axles; verify the installed PCD and stud thread

• Use Dunbier LM or Slimline bearing kits only according to the axle journal size

• Hub, bearing, seal, brake and spring components must be selected by axle journal and installed configuration

• Comparable axles from AL-KO, Mackay, Trojan or other manufacturers are not direct replacements unless beam length, spring centres, journal size, brake offset and wheel track all match

  

🚤 Trailer Compatibility & Application

  

• Suitable for compatible Dunbier marine trailers using the stated beam size, overall length and spring-centre geometry

• Measure the existing axle from hub face or axle end using the same method as the replacement catalogue before ordering

• Confirm wheel offset, tyre clearance, mudguard clearance and boat-hull clearance

• Axle capacity is determined by the complete axle, bearings, hubs, springs, tyres, brakes and trailer certification—not beam size alone

  

🔌 Function

  

Supports the trailer load between the suspension and wheel hubs while maintaining wheel track, bearing alignment and brake mounting geometry. The hydraulic disc system converts brake-fluid pressure into caliper clamping force.

  

Common signs of wear or replacement:

  

• Axle beam is bent, twisted or visibly cracked

• Tyres wear unevenly because wheel alignment or camber has changed

• Bearing journals are scored, undersize, corroded or heat-discoloured

• Spring seats, brake flanges or welds are cracked

• Persistent bearing looseness remains after correct adjustment

• Brake discs are below minimum thickness or heavily corroded

• Calipers seize, leak or apply unevenly

  

🛠️ Installation & Safety

  

• Axle replacement and brake setup should be completed by a competent trailer technician

• Support the trailer on rated stands before removing suspension or hub components

• Align spring centres and axle orientation before tightening U-bolts

• Fit new bearing seals, correctly pack bearings and set bearing end float

• Verify wheel-nut torque, brake operation and tyre clearance before road use

• Bleed hydraulic systems or adjust mechanical cables as required

• Road-test progressively and recheck wheel-bearing adjustment and wheel-nut torque

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one complete brake axle assembly as currently packaged

• Supplied in original or equivalent packaging

## Details

- **Price:** 1600.5 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1600.50 AUD | In stock |

## Images

- 1616 Dunbier Axle 50 Square Hydraulic Brake 2170mm (85.5") | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1616-dunbier-axle-50-square-hydraulic-brake-2170mm-85-5)
> Updated: 2026-08-05