45mm Square Hydraulic Disc Brake Axle

45mm square hydraulic disc bake axle kits are for use on boat trailers due to the anti-corrosive characteristics. The 45mm square hydraulic axle assembly is our most popular seller.

This axle group is rated

• 1450kg for Slimline Bearings
• 1600kg for parallel bearings
• Review 2t Axle groups here

Boat trailers use hydraulic disc brakes due to the anti-corrosive characteristics of galvanised disc braking system.

• All Couplemate marine disc braked axles are Australian made and galvanised.
• Did you know Couplemate Trailer Parts have a lifetime warranty against faulty craftsmanship?
• Yes, it is true, however, this warranty does not cover consumables such as bearings and disc pads.

This Hydraulic Disc Brake Axle Kit includes:

• 45mm Square Axle rated @ 1450kg - 1600kg
• 1 x Pair Hydraulic Brake Calipers
• 1 x Pair of Anchor Plates welded to the axle
• 2 x 7/16" Caliper Bolts + Washer
• Pair of Galvanised Disc Rotors
• 2 x Japanese Slimline Bearings Sets
• Galvanised axle is an optional extra and available upon request

Couplemate has disc braked axles to suit the following wheel stud patterns

• Ford SL
• HT Holden SL
• HQ Holden SL
• Commodore SL
• 5 Stud Landcruiser SL
• 6 Stud Landcruiser SL
• 5 Stud Landcruiser Parallel
• 6 Stud Landcruiser Parallel

Purchase 2t American Stainless Rotor and Caliper setups here.

Calculating The Correct Axle Measurements

1. Measure the offset wheel. The wheel offset is the distance between the inside of the hub and the outside of the rubber.
2. Add 50 mm to the offset. Alternatively, choose your own distance between the rubber and the chassis.
3. Multiply by 2 for both sides. Add your chassis width to the above number.

Still unsure of what measurements to take? Check out this handy guide below:

[P] - Check material specifications. What size and profile is the axle (for example, 45mm Square)
[T] - Overall axle length (tip to tip)
[F] - Hub face to hub face measurement
[A] - Chassis width
[C] - Tyre clearance
[B] - Back offset
[H] - Tyre to chassis
[G] - Axle pad centres

Identifying Bearing Combinations

You will also need to identify your bearing combination which can be done by pulling off a hub and bearings, and locating the number laser engraved onto the bearing. You will require both the inner and the outer bearing number.

Review axle kit with various braking systems here

• 40mm Square Hydraulic Drum Brake Kit – 1000kg
• 40mm Square Mechanical Drum Brake Kit – 1000kg
• Round Mechanical Disc Braked 45mm Axle
• 45mm Round Hydraulic Drum Brake Kit – 1450kg
• 45mm Round Mechanical Drum Brake Kit – 1450kg