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Threads in diving equipment

Dive gear threads

Any corrections or additions to the list are very welcome (tommi (dot) salminen (at) iki (dot) fi).


Threads
ApplicationThread
Apeks (etc.) 2nd stage hose connector 9/16 UNF (= 9/16-18)
Poseidon Cyklon 2nd stage hose connector 14x1.25mm
Poseidon Jetstream 2nd stage hose connector M31x1.5mm
Apeks, Aqualung (etc) the bigger LP hose connector on 1st stage 1/2 UNF (= 1/2-20)
Regulator 1st stage LP port 3/8 UNF (= 3/8-24)
Compressor HP fittings G1/4(BSP)
Regulator 1st stage HP port and pressure gauge hose connector 7/16 UNF (= 7/16-20)
DIN regulator 1st stage to cylinder valve fitting R5/8 (= G5/8 = 5/8-14), not 25x2!
DIN regulator 1st stage to cylinder valve fitting for NITROX M26x2 ISO
Valve to Cylinder fitting (Europe) M25x2 ISO
Valve to Cylinder fitting (United States) 3/4 NPS (also 7/8 UNF is used)
Ikelite case-to-tray threads (at the bottom of the case) 12-24 (= 7/32UNC)
Ikelite case-to-port thread pitch (on compact camera cases, e.g. #6154.xx)16TPI
Sea & Sea Lens caddy bolt 10-32 (= 3/16UNF)
Sea & Sea SeaArmIV telescope arm locking 10-32 (= 3/16UNF)
Camera tripod mount 1/4" BSW (UNC1/4" x 20 works fine also)


Thread angles:
ISO and NPT threads have 60dec angle. BSW has 55dec angle.

Abbreviations:
NPT American Standard Pipe Taper Thread
NPSC American Standard Straight Coupling Pipe Thread
NPTR American Standard Taper Railing Pipe Thread
NPSM American Standard Straight Mechanical Pipe Thread
NPSL American Standard Straight Locknut Pipe Thread
NPTF American Standard Pipe Thread Tapered (Dryseal)
BSPP British Standard Pipe Thread Parallel
BSPT British Standard Pipe Thread Tapered
BSW British Standard Whitworth
UNF Unified Fine Thread
UNC Unified Coarse Thread

Inch number sizes:
First number is the size, second number is the thread count per inch.
eg. 10-32 means size 10 with 32 threads per inch (which means UNC thread on this size)
eg. 10-24 means size 10 with 24 threads per inch (which means UNF thread on this size)






























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