47-55.1 Drum screw

[87gn]

My 55.1 - 3/4 ton brake drum has 2 flush screws that gently hold the drum to the axle. I am looking to buy 2. Also, I need 1 castle head bolt, this bolt is 1 of 8 that hold the axle to the hub.

[Rickysnickers]

At this point, I'm going to assume you are looking to purchase from a website and you asking for help in that regard. Asking for someone to buy from is against the board rules. So, for the time being this post will stay.

[Hcb3200]

for the castle head bolt looks like that is a more modern rear end maybe a 99-04 Ford F250 F350 SRW Sterling 10.5 Rear Axle Shaft Flange Bolt OEM is what you are looking for. Without more detail hard to tell

one on ebay https://www.ebay.com/itm/1775735632....SABEgLy3_D_BwE


for the drum holding screw. just pull the one you have and take to local auto or hardware store and find its match.

[leegreen]

the screws are probably just 1/4-20 flathead machine screws you can buy anywhere.

those bolts are self locking bolts, the shape of the head allows it to deform as it is tightened. They are used in high vibration stuff like flywheels, flex plates. figure out what thread they are and you can probably google some up.

[mr48chev]

The screw while no longer necessary as it only served to keep the drum on the axle during transportation before the truck was assembled can be found at your local hardware store but you don't want a very long one. 1/2 inch of threads is more than plenty. Put anti seize on the threads on those screws so you can get them out later. The old ones were probably destroyed taking them out.

The matching axle shaft retaining bolt you will have to find on another axle or in someone's junk bolt bin. Those aren't sold aftermarket and it isn't a castle bolt that is the manufactures mark and grade indicator. I'd put that on my "I'll find one someday" list of things to look for when you are out scrounging .

[leegreen]

that shape of drum is one where I'd probably put the screws in. The hat shape cross section is bad for falling off the edge of the flange while you are trying to get the wheel on, then you end up rocking the big, heavy wheel back and forth to line the drum up again. Even worse if it is duals.

those slots are not a grade mark, the slots plus hole are special head type that make it self locking. The bolt shaft tries to pull the head down into the hole and those void areas let the head give enough that it flexes and locks in place. Some kinda physics magic.

[mr48chev]

It is a lot easier to put the wheels back on those if the drum stays in place. Good info on that style of bolt head. I think they were used on that style of Eaton Axle all though production so they shouldn't be hard to find.

[dsraven]

for the bolts you might try a heavy equipment parts place, like caterpillar. take a sample with you. if the parts guy needs a vin off a machine then slip around to the shop and ask a mechanic or service truck operator if he has seen somehing like that

[leegreen]

Call up a fastener supplier and ask for a 'self locking Place bolt' of the required thread and length, most will be able to help. But you may have to buy a box going that route. Fastenall would be a good bet, I think they exist in US as well as Canada

If you don't care about the non matching head, just use some thread locker on the regular bolt.
If you care about restoration points you may need to find a similar axle to liberate a bolt from. These bolts only came into use in the mid 50s and there are a few variations. Finding a new match may be tricky