Cartridge Mechanical Seals
Pre-assembled, pre-set single and double cartridge seals to API 682 — supplied to spec so they drop in without field measurement.
API 682 Type A/B/C · single & double · SiC / Carbon / TC · OEM-compatible · Custom-machined
We are the manufacturer, not a reseller — so we set and test every cartridge before it ships, build it in-house, and supply it at quantities that work for a distributor, an OEM or a maintenance department. Here is how we approach cartridge sealing.
Pre-set
spacing locked at the factory, not on the bench
API 682
Type A, B and C cartridge configurations
Drop-in fit
built to your shaft and stuffing-box dimensions
Why a cartridge instead of a component seal
- No setting height to get wrong — a component seal has to be measured and set on the shaft by hand; a cartridge arrives pre-set, so the most common installation error simply cannot happen.
- Faster changeouts, less downtime — the whole unit slides on as one assembly. A millwright swaps it in minutes instead of lapping and setting faces in the field.
- Repeatable across a fleet — every cartridge of a given part number is identical, so reliability does not depend on who happened to install it.
- Cleaner upgrade path — converting a packed pump or an old component seal to a cartridge is the single easiest reliability win on most stuffing boxes.
New to the trade-off? Read component vs cartridge mechanical seals for the full comparison.
What we supply
Single and double cartridge units, OEM-compatible or fully custom — at the quantities your operation actually orders.
Single cartridge seals
Balanced single cartridges in SiC, carbon or tungsten-carbide faces for clean and lightly contaminated duty on water, utility and general process pumps.
Double cartridge seals
Pressurized and unpressurized double cartridge seals with barrier or buffer fluid for hazardous, toxic or volatile service.
OEM-compatible & custom
Drop-in equivalents to common cartridge designs, or fully custom units machined from a drawing or a sample for obsolete and non-standard pumps.
Match the cartridge to the duty
Face pair, arrangement and flush plan are set by the service — not by what a catalogue stocks. The table is a starting point; send us the duty and we confirm it.
| Service | Face pair | Arrangement | Typical flush |
|---|---|---|---|
| Clean water / utilities | Carbon / SiC | Single cartridge | Plan 11 |
| General chemical | SiC / SiC | Single, well-flushed | Plan 11 / 21 |
| Hazardous / toxic | SiC / SiC | Double cartridge + barrier | Plan 53A/B |
| Abrasive slurry | SiC / SiC | Double cartridge | Plan 32 / 54 |
Go deeper: Component vs cartridge seals · Double seal arrangements.
Cartridge Mechanical Seal FAQ
Component or cartridge — which do I need?
Cartridges win wherever installation skill varies or downtime is expensive — they remove the setting-height error entirely. Component seals can still make sense for very small pumps or tight cost targets. The full trade-off is in our component vs cartridge comparison.
Will a cartridge fit my pump?
We build to your shaft diameter and stuffing-box dimensions, and to common ANSI B73.1 and ISO envelopes. Send the pump make and model, a seal drawing, or a sample of the old seal and we confirm the fit before quoting.
Single or double cartridge?
Single cartridges suit clean and lightly contaminated duty. Hazardous, toxic, volatile or abrasive media should run a double cartridge with a barrier or buffer fluid so the process never sees atmosphere.
Do you build to API 682?
Yes. We supply API 682 Type A, B and C cartridge seals to the standard’s arrangement and piping-plan requirements, sized to your pump and service.
Source Cartridge Mechanical Seals At Scale
OEM-compatible, custom-machined and private-label cartridge seals built in-house to your spec, at low minimums. Send a pump model, a duty sheet or a sample and we’ll quote.