SAE flanges and flange adapters
Where flow and pressure outgrow a threaded connection, the industry switches to a bolted flange. Two series, one dimension difference, and they do not interchange.
Code 61 vs Code 62
| Code 61 | Code 62 | |
|---|---|---|
| Standard | SAE J518-1, 3000 psi class | SAE J518-2, 6000 psi class |
| Flange head thickness | Thinner | Thicker |
| Bolt pattern | Same nominal size, different head | Same nominal size, different head |
| Interchangeable? | No. The flange head and the clamp depth differ. Substituting one for the other will not seat correctly. | |
| Typical duty | Return and medium-pressure lines | Main pressure lines on large machines |
Components we supply
- Flange adapters — flange head to JIC, to ORFS, to BSP, to NPT, to metric
- Split flange halves — the two-piece clamp that bolts the flange head down
- Flange clamps — one-piece and two-piece styles
- O-rings and O-ring kits — the sealing element; sized per flange
- Bolt kits — usually grade 8.8 or 10.9, with the correct length per flange thickness
- Hose ends with flange heads — Code 61 and Code 62
Sizes
Nominal sizes from 1/2" up through 2" and beyond, corresponding to dash -08 through -32. The flange size, the port size and the tube or hose bore are three separate numbers — quote all three.
The most common flange mistake
Mixing a Code 61 flange head with a Code 62 clamp (or the reverse). They bolt up,
they look right, and they leak at the O-ring because the clamp does not sit at the correct depth. If a
flange assembly leaks immediately after rebuild, check the code marked on both halves before looking
anywhere else.
Pressure and confirmation
The code class gives the series pressure class; the actual working pressure of the assembly also depends on the flange material, the bolts and the O-ring compound, and it is defined by SAE J518. We confirm the rating for the exact parts on the order rather than quoting a generic number.