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Reducing Coupling 1" × 1 1/2" BSP Class 3000 ASTM A105
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Description
Reducing Coupling 1" × 1 1/2" BSP Class 3000 ASTM A105
- Female threads: G 1" × 1 1/2"
- Thread type: BSP (also known as G, Rp, parallel pipe thread)
- Pressure class: Class 3000 (206 bar)
- Material: ASTM A105 carbon steel (equivalent to P245GH / P285GH)
- Excellent weldability
- Dimension D: 64 mm
- Dimension W: 79 mm
- Manufactured according to ANSI B16.11
- 3.1 material certificate available on request (free of charge)
- Applications: High-performance installations, boilers, high-pressure systems, high-temperature installations, refineries, marine industry
- Origin: European Union

Alternative Name
Reducing Coupling 1" × 1 1/2" BSP Class 3000 ASTM A105, High-Pressure BSP Reducing Coupling, Female Threaded Coupling, Carbon Steel Coupling, BSP Female Adapter, Forged Steel Coupling
Information
The 1" × 1 1/2" BSP Class 3000 ASTM A105 Reducing Coupling belongs to the group of high-pressure threaded fittings. It is designed for joining pipes with different thread sizes in demanding pressure piping systems. The fitting is manufactured from forged ASTM A105 carbon steel and provides a durable and leak-tight threaded connection.
Reducing couplings are available in a full range of inch sizes. Each fitting is permanently marked with its size, material grade, heat number, and pressure class, ensuring full traceability and compliance with industry standards. All threaded fittings are available with a 3.1 material certificate.
Material
ASTM A105 is a forged carbon steel widely used for pressure piping components and fittings operating at ambient and elevated temperatures. It offers excellent mechanical strength, good machinability, and outstanding weldability.
Advantages
- BSP female threads
- Pressure class: Class 3000 (206 bar)
- High mechanical strength
- Excellent weldability
- Reliable threaded connection
- Manufactured according to ANSI B16.11
- 3.1 material certificate available on request
Marking
Each coupling is permanently marked with:
- Size
- Material grade
- Heat number
- Pressure class
- Thread type (where applicable)
All markings comply with the applicable industry standards.
Available Material Grades
Threaded fittings are available in:
- ASTM A105
- ASTM A350 LF2
- 304
- 316
- A106
- API 5L
- A182
- A312
- A333
- A335
- A350
- A420
- A403
- A694
- F304
- F304L
- F316L
- F321
- TP304
- TP304L
- TP316
- TP316L
- TP321
- LF2 CL.1
- 1.4404
- 1.4401
- 1.4301
- S355J2
- P355NL1
- P355NH
- P355QH
- L360NB
- 1.0566
- 1.0562
- A420-WPL6
- A333 Grade 6
- StE355
Advantages
- Easy selection of thread type and material grade
Limitations
- Not available with metric threads
Certification
Impact-tested material certificates are available.
We also offer reducing couplings in many other sizes. If you have any questions, please contact us. Call +48 63 261 42 02 or email biuro@polberis.pl.
Learn more about our threaded fittings here >>
Technical data
| Coupling Type | Reducing Coupling |
| Material | Carbon Steel |
| Pressure | Pressure Range 101–250 bar |
| Connection 1 | 1 1/2'' |
| Thread Type – Connection 1 | BSP / G / Rp / Rc Thread |
| Connection 2 | 1'' |
| Thread Type – Connection 2 | BSP / G / Rp / Rc Thread |
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-
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