Parker Pipe Fittings | Reducers, Expanders & Conversion

This Section contains adapters with thread types including NPT, NPTF, BSPT, BSPP, SAE UN/UNF, and Metric. All the threads in this section are made to industry specifications with conformance shown in the table on the right.
Thread Standard

NPT

ANSI B1.20.1, FED-STD-H28/7

NPTF

SAE J476, ANSI B1.20.3, FED-STD-H28/8

BSPT

BS 21, ISO 7/1

BSPP

BS 2779, ISO 228/1

Metric

ISO 261, ANSI B1.13M, FED-STD-H28/21

UN/UNF*

ANSI B1.1, FED-STD-H28/2

*Class 2A or 2B

Parker Pipe Reducer, Expander, & Conversion Configurations

Straight Thread Reducer Expander

Straight Thread Reducers/Expanders

Part Number:  F5OG5
Manufacturer: Parker


Female Pipe Adapter

Female Pipe Adapters

Part Number:  F5OG
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F5OHG8
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F5OHG4
Manufacturer: Parker


Female Straight Thread Adapter

Female Straight Thread Adapters

Part Number:  FHG5
Manufacturer: Parker


Expander Adapter

Expander Adapters

Part Number:  FG
Manufacturer: Parker


Pipe Thread Reducer

Pipe Thread Reducers

Part Number:  PTR
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  FHG8
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  FHG4
Manufacturer: Parker


Reducer Expander

Reducer Expanders

Part Number:  F87OHG87M
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F8OHG5
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F8OHG
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F4OHG5
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F4OHG
Manufacturer: Parker


BSPT Reducing Adapter

BSPT Reducing Adapters

Part Number:  PTR34M
Manufacturer: Parker


BSPP Reducing Adapter Expander

BSPP Reducing Adapter Expanders

Part Number:  RI-ED
Manufacturer: Parker


BSPP Reducing Adapter Expander

BSPP Reducing Adapter Expanders

Part Number:  RI
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F3HG
Manufacturer: Parker


Conversion Adapter

Conversion Adapters

Part Number:  F3HG5
Manufacturer: Parker


Parker Fittings & Port Adapters

Parker Pipe Fittings

Parker pipe fitting shaped products (elbows, tees and crosses) are hot forged and machined. Parker straight pipe fittings are manufactured from cold drawn barstock. Where applicable, the fittings are made in conformance with SAE J514, J530. All Parker steel pipe fittings are zinc plated with silver chromate (zinc chromium 6 free). Stainless steel pipe fittings are passivated.

Application Guidelines
for Tapered Threads

Straight Connectors with NPT/NTPF Threads
3/4-14 and Smaller

Straight connectors with 3/4-14 NPT/NPTF and smaller male pipe threads have very high pressure holding capability and seal reliability when used in applications without need for disconnecting and reconnecting the fittings such as maintenance connections. They are also well suited for low cycle non-pulsating (static) applications with pressures in excess of 6,000 psi.

Straight Connectors with NPT/NPTF Threads Above 3/4 -14 and
All Shaped Connectors with NPT/NPTF Threads

It is difficult to always tighten shapes with pipe threads to an optimum tightness level because of orientation requirements.

Also, all connectors in with pipe threads have low reliability for leak free operation in dynamic applications. Therefore, they are not preferred where a leak free joint is required.

All NPTF Connectors

Pipe thread connections can be disassembled and reassembled in low-pressure systems, but they are not intended to be a frequently assembled and disassembled. For connections in higher pressure systems requiring frequent disassembly and reassembly, use connections with an elastomeric seal, such as SAE straight thread port (SAE J1926/ISO11926), SAE four bolt split flange (SAE J518/ISO 6162), or ISO 6149. For applications where elastomeric seals can’t be used, please contact our customer service.

BSPT & Metric Taper Connections

BSPT and metric taper connections are similar to the NPT/NPTF connections. Follow the same guidelines.


All tapered thread connections have the following limitations:

  • Poor dynamic sealing
  • Possible expansion/cracking of the port
  • Orientation is a concern with shaped connectors
  • Larger threads are more prone to leakage (more potential leak points)
  • System contamination by thread sealants
  • Prone to galling, especially in stainless steel
  • Limited remakeability