65mm Round x 16mm U-Bolt Kit – 200mm Long

Part No: CM605 Category: Tag:


113 in stock

The Couplemate™️ 65mm Round U-Bolt Kit (M16) provides a strong and secure connection. Perfect for trailers and caravans up to 4500kg ATM and is suitable for salt water application.

 Strong steel u-bolts and plates.
 Electro-plated for corrosion resistance.
 Includes galvanised nyloc nuts and zinc washers.

113 in stock

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65mm Round Heavy-Duty U-Bolt Kit – Medium & Heavy-Duty Trailers

The Couplemate™ CM605 is a Spring U-bolt kit for 65mm round axles. Designed to secure leaf springs to the axle safely, Couplemate™️ calls these the “heavy-duty” kits because they have thicker U-bolts and fish plates. 

Product Specifications

  • Internal U-Bolt Width: 65mm
  • Internal U-Bolt Leg Length: 200mm
  • Thread Type: M16x2
  • Coating: Electro-Plated

Couplemate™️ often supplies Heavy-Duty u-bolt kits with trailer axle rebuilds over 1600kg (and up to 4500kg ATM).

This kit is supplied with:

  • 4 x U-Bolts
  • 8 x Washers
  • 8 x Nyloc nuts
  • 2 x Fish Plates
  • 2 x Axle Pads/Spacers

16mm Individual U-Bolts

Installation (User Guide)

Couplemate™️ 65mm Round U-Bolt Kits are easy for trailer spring maintenance.

  • Place U-shaped curve over axle beam.
  • Align the centre spring bolt and U-bolt legs with the fish plate holes.
  • Secure fish plate to leaf spring through supplied washers and nylock nuts. Tighten nuts to 100Nm with a socket.

Important: Check U-bolts and re-tighten nuts after the first trip and every 250 km thereafter.

Safety Precautions

Do not re-use nyloc nuts. Nyloc nuts are often less effective after the first use. This is because the nylon material (the key component of a nyloc nut) has already once conformed to the thread profile. 

Do not use a rattle gun to tighten. Rattle guns often tighten u-bolts too fast, too tight, and uneven. This can cause nylon overheat and risks undue wear. 

Ensure the axle has welded axle pads. If not, use the axle pads supplied with the spring U-bolt kit.

Additional information

Weight6 kg
Dimensions20 × 10 × 5 cm
Internal Length


Internal Width






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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