THREADING 


1. Thread sealant is required to seal the thrads on Thread Seal connections, except for NPTG as noted below.
2. NPTF threads do not require sealant for initial use, when used with mating NPTF threads. once NPTF are used, they require sealing compound for future use.
3. An NPSM or NPSH ball seat female requires a matching internal bevel on the NPSM, NPSH, or NPT male.


NOTE: Compatibility of thread type does not ensure compatibility of the fittings, due to sealing design and thread lengths. Always use mating fittings of the same type. 



BSPP

British Standard Pip Parallel

Washer Seal

Male BSPP-Female BSPP
Female BSPP- ale SOPP

BSPT

British Standard Pipe Tapered

Thread Seal or
Washer Seal 

Male BSPT- Female BSPT, BSPP
Female BSPT

CHT

American Standard Fire Hose
Coupling Thread (1" Natinal Hose
Thread is Chemical Hose Thread,
and is also knon as Booster Hose Thread)

Washer Seal

1" Male NH (NST)- 1" Femae lNH (NST)
1" Femael NH (NST)- 1" Male NH (NST)
Not compatible with other systems.
The 1" Thread is used on both 3/4" and 1" hose

GHT

Garden Hose Thread

Washer Seal

Male GHT- Female GHT
Female GHT- Male GHT
Not compatible with other systems

ISP
(NPS, SIPT)

Iron Pipe Straight Thread

Washer Seal

Generic name for Straight Thread Pipe

IPT

Iron Pipe Thread

 

Generic name for All Pipe Thread (NPSH)
More information is needed.

JIC (37o)

Joint International Committee

Mechanical Seal,
Metal to Metal,
or O-Ring Seal

Used with other JIC threads

NH or NST

American Standard Fire Hose Coupling 
Thread (National Hose Thread is also known
as National Standard Thread)

Washer Seal

Male NH (NST)- Female NH (NST)
Female NH (NST) - Male NH (NST)
Not compatible with other systems.
Thread pitch and diameters of fire thread
may vary according to local and municipal
regulations. Consult with us.

NPT

American Standard Taper Pipe Thread
(National Standard Tapered)

Thrad Seal or
Washer Seal

Male NPT- Female NPT, NPTF, NPSM, NPSH
Female NPT- Male NPT, NPTF

NPTF

American Standard Taper Pipe Thread
(National Pipe Tapered Fine)

Thread Seal or
Washer Seal

Male NPTF- Femae NPTF, NPT, NPSM, NPSH
Female NPTF- Male NPTF, NPT

NPSH

American Standard Straight Pipe for Hose
Couplings (National Pipe Straight Hose)

Washer Seal

Male NPSH- Female NPSH, NPSM
Female NPSH- Male NPSM, NPT,NPTF

NPSM

American Standard Straight Mechanical 
Joints (National Pipe Straight Mechanical)

Washer Seal,
Mechanical Seal,
Metal to Metal, 
or O-Ring Seal

Male NPSM- Female NPSM
Female NPSM- Male NPSM, NPT, NPF
Both mating fittings must be of the same type.

TIPT

Tapered Iron Pipe Thread

Thread Seal

Generic name for Tapered Pipe Thread (NPT)