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What part is a Three Hole Cap Screw Nut for automatic hubs - AKA Drag Shoe Nut?
Wiki User
∙ 12y ago
It's a special nut found more commonly on early model Fords, Jeeps, IHs & very few GM trucks as it is only found on "external" hubs. The nut system contains 4 parts:
- Keyed washer
- Wheel bearing nut
- Keyed, index (with holes or slots) washer
- Drag Shoe Nut
There's two types of Drag Shoe Nuts
- Smaller diameter - Auto-Matic hubs
- Larger diameter - Lock-O-Matic hubs
Each uses the same keyed washer (#1) & wheel bearing nut (#2)
The Auto-Matic hub's DSN has four 1/8" diameter holes in its face, two of which are threaded, each of which contain a full dog point set screw that receives either a 1/16" hex bit or allen wrench. This uses an index washer that has holes in it. To lock the nut in place, one hole must completely receive a set screw.
The Lock-O-Matic hub's DSN has five 1/8" diameter holes in its face, three of which are threaded, each of which contain a full dog point set screw that receives either a 1/16" hex bit or allen wrench. This uses an index washer with slots in it. To lock the nut in place, at least two slots must completely receive a set screw.
The unthreaded two holes in either nut, receive a pinned spanner wrench/tool. The tool is used to tighten/loosen the nut. These nuts had a short life due to people being ignorant to their design & beating on the nut with a chisel and hammer, while the set screws were still seated. Sometimes the set screws' holes have been found to be marred so badly, that a 1/16" allen wrench can't be used to even feel around to see if there's still a set screw in the hole!
When uninstalling, you unthread the set screws completely and thread them back in three or four threads so you don't accidentally use the threaded holes with the tool... which is hard to do considering the threaded holes are the only two that are a perfect 180° apart. Then you spin the nut off... if you don't have the $175 tool, or the $10 tool that came with the hubs/service kit, you can make one out of a set of channel locks or a Cressent Wrench. Drill 1/8" holes in the head of the pliers or wrench and insert a 1/8" needle, roller bearing in each hole. Open pliers/wrench to the correct size and there you have it.
Upon Installation, the keyed washer is installed, then the wheel bearing nut (torqued to specs - usually 40 foot pounds) and then the index washer, flat side out. The set screws are threaded into the beveled face of the DSN until the dog points are almost flush with the interior face (flat) of the nut. Then the DSN is threaded on and torqued to specs.
Wiki User
∙ 12y ago
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