45mm x 710mm Galvanised Slipper Leaf Spring
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Price range: $92.00 through $126.80 Inc.GST
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Heavy Duty Boat Trailer Slipper Spring 710mm Long 5 Leaf
Heavy-duty boat trailer slipper spring 710mm long. 710mm is a durable highway spring designed to withstand the rigours that high speed can inflict on boat trailer suspension.
This boat trailer slipper spring 710mm long is a good option for boat trailers, caravans, and other trailers that need a heavy-duty suspension. It is also a good choice for trailers used in harsh conditions, such as off-road trailers.
This spring style has a traditional eye and a tail that slides into a keeper or hanger welded to the trailer’s chassis.
Specifications: Boat Trailer Slipper Spring 710mm Long
- 710mm Eye to Tail
- 45mm wide x 8mm thick per leaf
- 9/16″ x 7/8″ x 45mm bush
- 45mm wide
- Free camber of 110 mm
- Eye-to-centre bolt: 350 mm
- Durable and rust-resistant
- Suitable for boat trailers, caravans, and other trailers
- Good choice for trailers that will be used in harsh conditions
The price is for one spring; 8mm leaf spring ratings are as follows
- Five leaf – 675kg
- Six leaf – 750kg
- Seven leaf – 850kg
For example, a tandem trailer weighing 2,000kg x 120@ = 2,400kg
Axles, springs and associated equipment must rate a total of 2,400kg
Usually, using 2 x 40mm Square axles on a 2000kg trailer with slipper springs is generally standard practice. Wrong.
Heavy-duty galvanised slipper springs do not load-share or transfer load between both axles.
For example, each wheel in the above example carries 2,000kg (4 wheels), or 500kg per wheel.
Drive your trailer onto a gutter using only one wheel, and you will find the wheel on the same side is lifted off the ground.
The wheel OFF the ground is carrying zero kg.
The wheel on the ground carries 1,000kg, while the other two wheels on the ground carry 1,000 kg.
The axle with the wheels on the ground carries 1,500kg.
For a smooth ride, use shackle or rocker roller springs.
I noticed the shock loading from roadside potholes on the trailer was not as severe.
Although 8mm galvanised slipper springs are an excellent low-budget solution, if your budget allows, go to shackle or rocker roller springs,
Finally, if your 710 mm boat trailer slipper spring is aging prematurely, you may suffer vibration fatigue. Spring fatigue occurs when your axle is undersized, causing the vibrations to travel into your spring suspension.
Click here to read more about vibration fatigue.
More variations of the slipper and independent coil springs below
- 6mm x 45mm Trailer Slipper Spring – 765mm Long.
- 60mm AL-KO Slipper Spring
- Coil Springs to suit Independent Suspension.
Frequently Asked Questions
- What are the exact dimensions of this slipper spring? This leaf spring is 45mm wide and measures 710mm from the centre of the front bolt eye to the absolute tip of the rear slipper tail.
- Are these springs suitable for boat trailers? Yes, the hot-dip galvanised coating provides excellent corrosion protection, making them ideal for boat trailers and marine environments.
- Does this spring come with the front bush? Yes, this genuine slipper spring comes pre-fitted with a high-durability nylon or polyurethane bush in the front eye, ready for immediate installation.
- How do I know if I need a slipper spring or an eye-to-eye spring? Slipper springs have a round front eye and a flat, open tail that slides freely into a rear hanger. Eye-to-eye springs have mounting eyes on both ends.
Installation & Maintenance: Do’s & Don’ts
Properly handling and maintaining your leaf springs prevents premature wear and keeps towing safe. Follow these essential guidelines:
✅ What to Do
- ✔️ Do replace your leaf springs in pairs across the same axle to maintain balanced suspension height and performance.
- ✔️ Do apply a thin coat of marine grease inside the rear hanger to allow the slipper tail to slide smoothly.
- ✔️ Do check your U-bolts after your first few trips, as brand-new springs can settle and require re-torquing.
- ✔️ Do rinse the springs thoroughly with fresh water after every boat ramp launch to prolong the galvanised life.
❌ What to Avoid
- ❌ Don’t ever weld or apply direct torch heat to the spring leaves, as this completely ruins the steel’s tempered strength.
- ❌ Don’t force a 45mm spring into a narrower hanger block; it must have standard side clearance to prevent binding.
- ❌ Don’t exceed the stated weight capacity of the springs, as overloading causes flat-spotting and cracking.
- ❌ Don’t over-tighten the main shackle eye bolt; the front eye bush must be able to pivot slightly as the trailer moves.
Additional information
| Weight | N/A |
|---|---|
| Dimensions | 93 × 15 × 10 cm |
| Spring Leaf # | 5 Leaf, 6 Leaf, 7 Leaf |
| Spring Leaf Rating | 5 Leaf – 650kg, 6 Leaf – 650kg, 7 Leaf – 800kg |
| Spring Width | 45mm Wide |
| Spring Type | Slipper Spring |
| Spring Length | 710mm |
| Coating | Galvanised |
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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