Threaded Bushing
Threaded Bushing : Specifications | Materials | Dimensions | Weight Chart | Tolerances | FAQ
ASME B16.11 Threaded Bushings – Hex Head, Square Head & Reducing Bushing Manufacturer | Stainless Steel, Carbon Steel, Alloy Steel & High Nickel Alloys | Export to UK, Canada, Saudi Arabia, Singapore & South American Countries
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Midland Forge and Fittings Pvt. Ltd. is a trusted manufacturer and supplier of high-quality forged fittings, catering to global industries with a focus on reliability and precision. With advanced manufacturing facilities and strict quality assurance practices.
we specialize in producing forged Thredaed Bushing that meet international standards. Our commitment to innovation, timely delivery, and customer satisfaction has earned us a strong reputation in the oil & gas, petrochemical, power generation, and marine sectors.
A threaded bushing is a forged fitting designed to connect pipes of different sizes by reducing the bore, while maintaining a secure, leak-proof connection. Manufactured in compliance with ASME B16.11, these bushings are available in pressure classes 3000# and 6000# and are used in high-pressure piping systems. They feature internal and external threads, allowing easy installation without welding. Threaded bushings are ideal for applications where frequent disassembly, adjustment, or maintenance is required, making them suitable for refineries, chemical plants, offshore platforms, and hydraulic systems.
At Midland Forge, our ASME B16.11 Threaded Bushings are engineered from premium materials such as stainless steel, carbon steel, alloy steel, and high nickel alloys to withstand extreme pressure and temperature conditions. Each bushing is precisely machined to ensure accurate threading, superior strength, and long service life. Designed for efficiency and safety, our threaded bushings provide dependable performance in demanding industrial environments, reducing downtime and ensuring smooth fluid or gas flow across diverse piping systems.
Threaded Bushing Specifications
Forged Threaded Bushing – Materials, Grades & Standards
| Material Category | Grade | Standards (ASTM / ASME) | Typical Use / Application |
|---|---|---|---|
| Stainless Steel | 304 / 304L / 304H | ASTM A182 F304 / F304L / F304H | General purpose, corrosion resistance |
| 316 / 316L / 316H | ASTM A182 F316 / F316L / F316H | Marine, chemical, and food processing | |
| 317 / 317L | ASTM A182 F317 / F317L | High corrosion resistance | |
| 321 / 321H | ASTM A182 F321 / F321H | High temperature, stabilized service | |
| 347 / 347H | ASTM A182 F347 / F347H | High-temp, pressure systems | |
| 904L | ASTM A182 F904L | Acid handling, sulfuric environments | |
| 254 SMO | ASTM A182 F44 | High chloride & seawater applications | |
| Carbon Steel | A105 | ASTM A105 | Pressure piping & general industries |
| A350 LF2 | ASTM A350 LF2 | Low temperature services | |
| A694 F42 / F46 / F52 / F56 / F60 / F65 / F70 | ASTM A694 | High-pressure pipelines, oil & gas | |
| Alloy Steel | F1 / F5 / F9 | ASTM A182 F1 / F5 / F9 | High-temp & pressure pipelines |
| F11 / F22 | ASTM A182 F11 / F22 | Steam lines & refineries | |
| F91 | ASTM A182 F91 | Power generation, high performance | |
| Duplex Steel | UNS S31803 / S32205 | ASTM A182 F51 / F60 | Corrosion resistance, high strength |
| Super Duplex Steel | UNS S32750 / S32760 | ASTM A182 F53 / F55 | Offshore, seawater applications |
| Nickel Alloys | Nickel 200 / 201 | ASTM B564 | Alkali & chemical processing |
| Inconel 600 / 625 / 718 | ASTM B564 | Heat exchangers, aerospace | |
| Incoloy 800 / 825 | ASTM B564 | Petrochemical & chemical processing | |
| Hastelloy C22 / C276 | ASTM B564 | Severe corrosion resistance | |
| Monel 400 / K500 | ASTM B564 | Seawater, marine engineering | |
| Alloy 20 | ASTM B564 | Sulfuric acid services | |
| Nimonic 75 / 80A | ASTM B564 / B637 | High-temp aerospace & turbines | |
| Copper Nickel | Cu-Ni 90/10 / 70/30 | ASTM B151 / B467 | Marine systems, seawater service |
| Titanium | Grade 2 / Grade 5 | ASTM B381 | Lightweight, corrosion resistance |
| Aluminium | 6061 / 5083 | ASTM B247 | Low-pressure, non-corrosive piping |
Dimensions of ASME B16.11 Threaded Bushing
| NPS (Large End) | NPS (Small End) | Outside Hex (Across Flats) | Minimum Length (F) | Class 3000# | Class 6000# |
|---|---|---|---|---|---|
| ½” | ¼” | 28.6 | 19.0 | ✔ | ✔ |
| ¾” | ½” | 34.9 | 22.0 | ✔ | ✔ |
| 1″ | ½” | 41.3 | 24.0 | ✔ | ✔ |
| 1″ | ¾” | 41.3 | 24.0 | ✔ | ✔ |
| 1 ¼” | ½” | 47.6 | 27.0 | ✔ | ✔ |
| 1 ½” | ¾” | 53.9 | 28.5 | ✔ | ✔ |
| 2″ | 1″ | 66.7 | 32.0 | ✔ | ✔ |
| 2 ½” | 1 ½” | 82.6 | 38.0 | ✔ | ✔ |
| 3″ | 2″ | 98.4 | 41.0 | ✔ | ✔ |
| 4″ | 3″ | 127.0 | 48.0 | ✔ | ✔ |
Weight Chart: ASME B16.11 Forged Bushing
| Nominal Pipe Size (NPS) | 3000# (kg) | 6000# (kg) |
|---|---|---|
| 1/8″ × 1/16″ | 0.01 | 0.02 |
| 1/4″ × 1/8″ | 0.02 | 0.03 |
| 3/8″ × 1/4″ | 0.03 | 0.04 |
| 1/2″ × 1/4″ | 0.05 | 0.07 |
| 1/2″ × 3/8″ | 0.06 | 0.08 |
| 3/4″ × 1/2″ | 0.10 | 0.12 |
| 1″ × 1/2″ | 0.15 | 0.18 |
| 1″ × 3/4″ | 0.20 | 0.24 |
| 1-1/4″ × 1/2″ | 0.25 | 0.30 |
| 1-1/4″ × 1″ | 0.30 | 0.36 |
| 1-1/2″ × 1″ | 0.40 | 0.48 |
| 2″ × 1″ | 0.55 | 0.70 |
| 2″ × 1-1/2″ | 0.65 | 0.82 |
| 2-1/2″ × 2″ | 0.80 | 1.05 |
| 3″ × 2″ | 1.20 | 1.50 |
| 3″ × 2-1/2″ | 1.40 | 1.80 |
| 4″ × 3″ | 2.00 | 2.60 |
Forged Threaded Bushing Tolerances as per ASME B16.11
| Parameter | Tolerance |
|---|---|
| Overall Length (End-to-End) | ± 1.5 mm (± 0.06 in) |
| Outside Diameter across Hex / Round | ± 1.5% or ± 1.5 mm (whichever is greater) |
| Thread Dimensions | As per ASME B1.20.1 (NPT) |
| Thread Engagement Length | Hand-tight engagement + 2–3 turns with wrench |
| Taper of Threads | 1:16 (¾ in per foot) |
| Wall Thickness | No negative tolerance permitted (minimum as per design) |
| Concentricity (Bore to OD) | Max. 0.03 in per in (0.8 mm per 25 mm) of OD |
How to select the right threaded bushing for an application?
- Pipe Size & Reduction Required (NPS sizes must match)
- Pressure Class (3000#, 6000#, 9000#)
- Material Compatibility (corrosion, temperature, pressure)
- Thread Type (NPT as per ASME B1.20.1)
- Standards Compliance (ASME B16.11 mandatory for forged bushings)
📌 For example:
- For steam at 500°C, Alloy Steel F22 or F91 (6000# / 9000#) is selected.
- For seawater applications, Duplex or Super Duplex is preferred.
- For general water/gas piping, Carbon Steel A105 (3000#) is sufficient.
Can threaded bushings be reused?
Yes, Threaded Bushings can be reused provided:
- Threads are not worn, stripped, or damaged.
- Sealing integrity is intact (no galling or cracking).
- They pass visual inspection and gauge tests.
What is the difference between a threaded bushing and a threaded reducer?
- Threaded Bushing: Has male and female threads for size reduction. Compact and suitable for confined spaces.
- Threaded Reducer: Has two different-sized female threads only (no male threads). It is longer and provides smoother flow transition. 👉 Engineers select bushings when space-saving and high strength are required, whereas reducers are used when better flow characteristics are needed.