Mate if you go to Trailerparts, tell them your axle size eg 50mm square,they will be able to sort you out

if you remove the original bearings, clean them up, and then take them to a trailer parts or bearing shop (CBC or statewide bearings). then they can check the part numbers, or correctly size the old ones.

i know you want to get them beforehand, but at least this way, you can guarantee you'll only be doin the one trip to the shop.

yeah there are too many sorts out there including slimlines that suit a ford hub .. (they are the high pressure ones) so you are going to have to get the numbers off the side of the bearing ... just pop off the dust covers or bearing buddies and write it down.

Axel sizes wont mean much. It depends on what bearings the ends have been machined to take.

As mentioned before. Take a hub off and record the bearing numbers on the sides of the bearings. Then pay a visit to a bearing or trailer parts retailer.

Avoid cheap bearings....... Go for timkin if you have a choice, or any other reputable brand.

mate measure tip to tip across your stud pattern like u do them up measure from center to center on two studs then take that measurement with you and they can determine holden/ford hubs are slighlty bigger on the fords

or you could buy both Ford and Holden sets and return the set you didn't need.

Have done heaps of bearing changes before , but as its first change on this trailer was wondering if anyone had same trailer to save me hassle of taking everything off to find out what they are.

yes im sure i had ford bearings on my dunbar trailer mate. My traily is a 2005 model as well.

confirm that dunbier has ford bearings well atleast every set i have done but hub measurement takes out guess work

HT and HQ. mmm the plot thickens. The part no. is the go.

bearings are the same  though

you cant find out what bearings you have got by measuring your hubs because you can get ht or hq or commodore hubs that run ford slimline bearings or vice versa the only way to tell is to take them out!!!!!!!!!!!!!!!!!!!

in a standard boat trailer hub?? come on bud,its towing a boat not racing cars at the lights

read my comment a bit closer there are 2 many variations of bearing types to go on by just measuring the hub for example just because you have a ford doesnt always mean you have ford slimline bearings behind it you may have holden bearings that is what im trying to say ring trailer parts and ask them if you dont believe me its got nothing to do with racing

beg to differ as a marine mechanic apprentice, now qualified, i have done more bearings than u probably have had hot dinners and measuring hubs is how u get parts in for tomorows jobs without having to get dirty and cant ever remember calling a holden hub and needing ford bearings or vice versa, anyway jmo enough said

and have the same broblem with different bearings on different trailers.

The boat trailer has HQ rims with Ford bearings and the box trailer has HQ rims with Holden bearings.

Can remember being told years ago that the size and shape of the axle determines the type of bearing. (As Rick mentioned)

From memory something along the lines of:

39mm Round and 40mm Square axles = Holden bearings

45mm Square axle = Ford slimline bearings.

Don't hold me to it as being gospel as there could be other axles made elsewhere other than trailer fabricators and parts suppliers that do not follow a standard.

As most have said "Get ya hands dirty and check the existing bearing numbers"

Cheers,

David

i didnt think the apprentice was going to believe me if he phoned up trailer parts he would find out that information I suppose just being a apprentice he hasnt come across the odd ones before but im sure he will in time ps dont take it the wrong way stilly im only going off my own experience

Almost certain it was from martins trailer parts that I was told about the axle size etc. Experience is the best way to learn. Have been in the mechanical trade (not automotive) for 30+ years and still learning the hard way at times.

PS Stilly.... Not having a go at you either

well you blokes obviously have some odd ball hubs/bearings, enough said may come across one but i reckon i could win lotto first ;)

Stilly,

They are all standard hubs. Don't want to sound like a smart a$$ but if you have a look at the links below I don't like your chances of winning lotto

Galvinised hubs

For example click on the following ranges:

FH150G Range - Ford hubs with holden bearings

CDF150G - Commodore rims with ford bearings

HTF150G - HT Holden hubs with ford bearings

Bearings

BK32 Set - Holden bearings suit 39mm round and 40mm square axles.

BK35 Set - Ford bearings suit 45mm square axles.