Short answer
Camlock type letters describe whether the coupling is an adapter or a coupler and whether the other end is threaded or has a hose shank. In addition to the type letter, the size, thread standard, material, seal and application must also be written.
Source: S028
Technical explanation
In common nomenclature, A, E and F denote adapter forms; B, C and D denote coupler forms. The letters alone are not a code for pressure, temperature or chemical suitability. The manufacturer's coding and dimension drawing must be verified. Dust protection parts such as DC and DP are not accepted as blanking elements under pressure without an explicit manufacturer declaration. Parts with different thread standards may carry the same type letter.
Source: S028
Topic-specific checkpoints
| Item | Description |
|---|---|
| A / B | Adapter + female thread / coupler + male thread |
| C / D | Coupler + hose shank / coupler + female thread |
| E / F | Adapter + hose shank / adapter + male thread |
| DC / DP | Dust cap / dust plug; pressure function verified separately |
Source: S028
How is it assessed in practice?
Do not end the order line with 'type C'; add the nominal connection size, hose shank size, body material and seal. For threaded types, specify the male/female gender and the standard, such as BSP/NPT. If the old sample is unclear, describe the function of both ends and share a photo instead of guessing the letter. An unsuitable shank or clamp does not turn a correctly selected Camlock body into a safe assembly; make the hose side part of the order as well.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
Does the same type letter mean the same thread standard?
No. The thread standard and size must be specified separately; the type letter defines the form of the connection.
Source: S028
Source coverage
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S028
A Look Into Dixon Cam and Groove Couplings Dixon · accessed 2026-10-19 Functionality; warning; gasket code note