39mm Galvanised U-Bolt Kit 5" with Fish Plates for Boat Trailer Axles

PRODUCT OVERVIEW

This 39mm round galvanised U-bolt kit is designed for securing trailer axles and springs, particularly in marine and boat trailer applications. The U-bolts include nyloc nuts and flat washers for a secure clamp and feature a hot-dip galvanised finish for corrosion resistance and long service life.

KEY FEATURES

• 39mm (1 1/2") round U-bolts, also commonly known as 40mm round
• Rated at 375kg per U-bolt (1500kg per set of four on a single axle)
• Hot-dip galvanised steel construction to resist corrosion
• Includes nyloc nuts and flat washers for a strong, secure clamp
• Suitable for 45mm wide trailer springs
• Ideal for boat trailers and marine environments

SPECIFICATIONS

• Suits: 39mm (1 1/2") round axles (also referred to as 40mm round)
• Overall U-bolt length: 125mm (5")
• Material diameter: 1/2"
• Thread length: 55mm
• Thread type: 1/2" BSW
• Finish: Galvanised steel
• Fasteners: Nyloc nuts and flat washers included

KIT CONTENTS

• 4 x 39mm (1 1/2") x 125mm (5") round galvanised U-bolts with nyloc nuts and flat washers
• 2 x galvanised slotted fish plates, 88mm x 100mm x 8mm
• 2 x galvanised axle pads, 40mm x 40mm x 8mm

U-BOLT SIZE FITTING GUIDE

The following chart provides a general guide for selecting U-bolt length based on axle size and spring leaf count:

• Axle: 39mm round, Spring: 3 leaf — Recommended U-bolt: 39mm x 100mm (4")
• Axle: 39mm round, Spring: 4 leaf — Recommended U-bolt: 39mm x 115mm (4 1/2")
• Axle: 39mm round, Spring: 5 leaf — Recommended U-bolt: 39mm x 125mm (5")

HOW TO MEASURE U-BOLTS

• Measure the inside width of the U-bolt to match the axle, drawbar or chassis rail size.
• Example: 75mm U-bolts fit 75mm drawbars or chassis rails.
• Measure the length from the inside of the U-bolt (from the inside of the bend to the end of the legs).