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Galvanised ElectroGal® Trailer Parts

by | Jun 20, 2019 | Couplemate Core | 0 comments

Galvanised Trailer Parts are being phased out!

Many Chinese manufacturers are phasing out galvanised trailer parts. The Government has imposed a galvanising tax. It’s as simple as that!

While still very popular, hot-dipped galvanising parts are being replaced by ElectroGal® or a Mechanical Galvanising process.

Technology evolution is paving the way for the ElectroGal® process to replace hot-dipped galvanising completely.

Vibration fatigue is often blamed on hot-dipped galvanising and the stresses in the process.

Hot Dipped Galvanising

The following processes can loosely summarise hot-dipped galvanising:

  • The product was cleaned by dipping in an acid bath to remove rust and debris.
  • The basket containing products is then washed to remove the acid.
  • Pickling, rinsing, fluxing solution.
  • A hot tub of galvanised zinc is prepared, into which a basket of product is dipped.
  • The parts undergo inspection while hot with any slag removed.
  • Parts are sometimes put into a cooling oven to de-embrittle over several hours.

galvanised trailer

Hot-dip galvanisation is a form of galvanisation. It is the process of coating iron, steel or aluminium with a layer of zinc by immersing the metal in a bath of molten zinc at a temperature of around 860 °F (460 °C).

When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen (O2) to form zinc oxide (ZnO). As a result, it further reacts with carbon dioxide (CO2) to form zinc carbonate (ZnCO3.

The result is a dull grey, relatively durable material that stops further corrosion in many circumstances.

This hot-dipped process is cumbersome, but the only method of rustproofing that has been available until ElectroGal®.

ElectroGal Video

ElectroGal is a multi mechanical plating process that bonds several coatings onto any product. Bonding allows bolt and nut threads to be better coated.

Couplemate uses the ElectroGal® for u-bolts, nylocks and washers.  We found fewer problems with nuts fitting the thread using the ElectroGal® process.

Examples of Galvanised trailer parts are:

  • Single Axle Trailers.
  • Tandem Trailers.
  • Tie-down rails.
  • Galvanised box trailers.
  • Camper Trailers.
  • Tradesman Trailers.
  • Cage Trailers.
  • Tandem boxes.
  • Flat Top trailers.
  • Hot dipped galvanised trailers.

Technical Aspects of ElectroGal

The next video explains the technical aspect of ElectroGal® bolts and nuts versus hot-dipped galvanised nuts and bolts.

We have learnt that the hot-dipped process adds a thicker, uncontrolled coating to the thread and the inside of the nuts.

The inside of the nuts is re-machined to remove the zinc. This enables the nut to be tight on the thread without stripping the thread. Nevertheless, no matter how careful operators are, bad threading remains a problem.

Watch the video for other problems.

Caravan and Trailer Problems

The video shows how badly galvanised nuts and bolts will not tension correctly.

Image a rough road and vibration fatigue. What is the effect on u-bolts?

  1. Why U-bolts may be the Major Cause of Accidents
  2. Caravanning Problems caused by Stretching U-Bolts

How good is cold gal paint?

Finally, I hope this series of videos and new technology helps explain the variety of available products.

In conclusion, purchase them here if you think about replacing your boat trailer standard and heavy-duty u-bolts.

galvanised trailer

Couplemate U-Bolts

Round U-Bolts


Square U-Bolts





Part Number
1 ½” (39mm)½” (13mm)4″ (100mm)U39R4GH
1 ½” (39mm)½” (13mm)4½” (112mm)U39R45GH
1 ½” (39mm)½” (13mm)5″ (125mm)U39R5GH
1 ½” (39mm)½” (13mm)5½” (137mm)U39R55GH
1 ¾” (45mm)½” (13mm)4″ (100mm)U45R4GH
1 ¾” (45mm)½” (13mm)4½” (112mm)U45R45GH
1 ¾” (45mm)½” (13mm)5″ (125mm)U45R5GH
1 ¾” (45mm)½” (13mm)5½” (137mm)U45R55GH
1 ¾” (45mm)½” (13mm)6″ (150mm)U45R6GH
1 ¾” (45mm)½” (13mm)6½”(162mm)U45R65GH
2″ (50mm)½” (13mm)4″ (100mm)U50R4GH
2″ (50mm)½” (13mm)4½” (112mm)U50R45GH
2″ (50mm)½” (13mm)5″ (125mm)U50R5GH
2″ (50mm)½” (13mm)5½” (137mm)U50R55GH
2″ (50mm)½” (13mm)6″ (150mm)U50R6GH
2″ (50mm)½” (13mm)6½”(162mm)U50R65GH
2″ (50mm)½” (13mm)7″ (175mm)U50R7GH
1 ½” (40mm)½” (13mm)4″ (100mm)U40S4GH
1 ½” (40mm)½” (13mm)4½” (112mm)U40S45GH
1 ½” (40mm)½” (13mm)5″ (125mm)U40S5GH
1 ½” (40mm)½” (13mm)5½” (137mm)U40S55GH
1 ½” (40mm)½” (13mm)6″ (150mm)U40S6GH
1 ¾” (45mm)½” (13mm)4″ (100mm)U45S4GH
1 ¾” (45mm)½” (13mm)4½” (112mm)U45S45GH
1 ¾” (45mm)½” (13mm)5″ (125mm)U45S5GH
1 ¾” (45mm)½” (13mm)5½” (137mm)U45S55GH
1 ¾” (45mm)½” (13mm)6″ (150mm)U45S6GH
1 ¾” (45mm)½” (13mm)6½”(165mm)U45S65GH
1 ¾” (45mm)½” (13mm)7″ (175mm)U45S7GH
2″ (50mm)½” (13mm)3″ (75mm)U50S3GH
2″ (50mm)½” (13mm)4″ (100mm)U50S4GH
2″ (50mm)½” (13mm)4½” (112mm)U50S45GH
2″ (50mm)½” (13mm)5″ (125mm)U50S5GH
2″ (50mm)½” (13mm)5½” (137mm)U50S55GH
2″ (50mm)½” (13mm)6″ (150mm)U50S6GH
2″ (50mm)½” (13mm)6½”(165mm)U50S65GH
2″ (50mm)½” (13mm)7″ (175mm)U50S7GH
2″ (50mm)½” (13mm)8″ (200mm)U50S8GH
2″ (50mm)½” (13mm)10″ (250mm)U50S10GH
2 ¼” (56mm)½” (13mm)4½” (112mm)U56S45GH
2 ¼” (56mm)½” (13mm)5″ (125mm)U56S5GH
2 ¼” (56mm)½” (13mm)5½” (137mm)U56S55GH
2 ¼” (56mm)½” (13mm)6½”(165mm)U56S65GH
3″ (75mm)½” (13mm)3″ (75mm)U75S75GH
3″ (75mm)½” (13mm)4″ (100mm)U75S100GH
3″ (75mm)½” (13mm)5″ (125mm)U75S125GH
3″ (75mm)½” (13mm)6″ (150mm)U75S150GH
3″ (75mm)½” (13mm)7″ (175mm)U75S175GH
3 ¼” (82mm)½” (13mm)4 ¾” (120mm)U80S120GH
4″ (100mm)½” (13mm)3″ (75mm)U100S75GH
4″ (100mm)½” (13mm)4″ (100mm)U100S100GH
4″ (100mm)½” (13mm)5″ (125mm)U100S125GH
4″ (100mm)½” (13mm)8″ (200mm)U100S200GH
1 ¾” (45mm)(16mm)6″ (150mm)CM600GH
2″ (50mm)(16mm)6″ (150mm)CM602GH
2 ⅓” (60mm)(16mm)7″ (175mm)CM604GH
1 ¾” (45mm)(16mm)6″ (150mm)CM601GH
2″ (50mm)(16mm)7″ (175mm)CM603GH
65mm(16mm)7″ (175mm)CM605GH


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