Newport Scientific, Inc.

M Series high pressure fittings and tubing have a maximum working pressure ranging from 125,000 psi (5M) up to 200,000 psi (3M). M Series tubing is bendable and easy to work, making it a suitable choice for any high pressure work with relatively moderate volume. For lower pressure rated small-volume tubing and fittings see L series. For larger volume 200,000 psi needs refer to 12H series.

Information for M Series crosses, tees, elbows, and basic connections are given below. For reference, here are the pressure ratings for these particular fittings:
2M: 150,000 psi
3M: 200,000 psi
5M: 125,000 psi
6M: 150,000 psi

See the high pressure tubing page for details on Harwood’s M Series tubing.