DDS Seals · Longmont, Colorado
From the frozen-drink machine at the corner store to the next rocket headed for the Moon.
Wherever a shaft turns, a seal keeps the oil in and the dirt out. DDS stocks more than 9,000 of them, in metric and inch sizes.
The shaft turns, the seal stays put in the housing. Its lip rides on a thin film of oil, and that film is the actual seal.
Where our seals work
Same job everywhere: oil in, dirt out.
Three stops, from the machine you walk past every day to the machinery that launches rockets. Each one shows where the seal sits and which type does the work.
Corner store
The frozen-drink machine
A small gearmotor turns the auger that keeps the slush moving, all day, every day. Where the auger shaft leaves the gearbox, a seal keeps the gear oil in and the sticky syrup and wash water out.
- Type
- TC, rubber O.D. with dust lip
- Material
- Nitrile (NBR)
- Where
- Gearbox output shaft
Highway
Car and EV drivetrains
A car has a shaft seal at every point where a turning shaft leaves an oil-filled housing: crankshaft, transmission, axles and wheel hubs. In an electric drive unit the motor shaft spins fast and runs hot, which is where Fluoro (FKM) earns its place.
- Type
- TC and TCV
- Material
- Nitrile (NBR) and Fluoro (FKM)
- Where
- Motor, gearbox and axle shafts
Launch pad
The machinery that sends rockets up
Before liftoff, pumps move propellant and water around the pad, and gearboxes drive the equipment that moves and services the rocket. Their shafts are sealed with heavy-duty metal-O.D. seals, sized to the shaft and the job.
- Type
- SA and TA, metal O.D. with inner case
- Material
- Nitrile (NBR) or Fluoro (FKM)
- Where
- Pump and gearbox shafts
Product lines
Standard sealing in Nitrile (NBR) and Fluoro (FKM). Silicone, Polyacrylate and special types made to order.
Where to buy DDS seals
Any quantity
Buy from a distributor
Order with your existing account and pricing. Every part page links to it at each distributor.
- Grainger
- Zoro
- MSC
- Fastenal
100+ pieces per part number
Buy direct from DDS
For volume orders, custom seals and our Stock & Store program: we hold your inventory and ship on your schedule against one blanket order.
Resell DDS seals? Become a distributor.
Engineering resources
Specifications for choosing and installing a rotary seal, based on DIN 3760 and ISO 6194-1.
Need a seal that isn’t listed?
Custom sizes, Silicone and Polyacrylate compounds, and special lip designs. Minimum 100 pieces per part number.