Carbon Steel Swage Nipple — Factory Direct Supplier | Huaxia-Steel

Huaxia-Steel manufactures and supplies high-quality carbon steel swage nipples for pipeline size reduction applications. Our swage nipples conform to ASTM A105, ASTM A234 WPB, and MSS-SP-95 standards, serving oil and gas, petrochemical, power generation, and water treatment industries worldwide.

Fig 1

Product Overview

A swage nipple is a forged or seamless pipe fitting used to connect pipes of different diameters. Unlike reducers, swage nipples feature straight parallel threads or plain ends suitable for welding, making them ideal for instrument connections, sample points, and threaded pipeline reductions.

Huaxia-Steel produces both concentric swage nipples (common centerline) and eccentric swage nipples (offset centerline) to match your piping layout requirements.

Specifications and Dimensions

Parameter	Specification
Size Range	1/8″ to 8″ (DN6 to DN200)
End Connections	NPT, BSPT, BSPP, plain (BE), threaded both ends (TBE), plain both ends (PBE)
Pressure Class	2000#, 3000#, 6000#, 9000#
Types	Concentric, Eccentric
Length	Standard 100-300mm; custom lengths available
Tolerance	±0.5mm diameter, ±1mm length

Dimensional Reference (Concentric — NPT Ends)

Size (Large × Small)	Large OD (mm)	Small OD (mm)	Overall Length (mm)	Wall Thickness (mm)
1/2″ × 1/4″	21.3	13.7	48	3.73
3/4″ × 1/2″	26.7	21.3	51	3.91
1″ × 1/2″	33.4	21.3	60	4.55
1″ × 3/4″	33.4	26.7	60	4.55
1-1/2″ × 1″	48.3	33.4	67	5.08
2″ × 1″	60.3	33.4	76	5.54
2″ × 1-1/2″	60.3	48.3	76	5.54
3″ × 2″	88.9	60.3	86	7.62
4″ × 3″	114.3	88.9	102	8.56

Custom dimensions and reducing combinations available on request. Contact us for full dimensional charts.

Fig 2

Material Grades and Standards

Grade	Standard	Application	Max Temp
ASTM A105	ASME B16.11	General piping, forged carbon steel	538°C
ASTM A234 WPB	ASME B16.9	Welded construction, seamless/welded	595°C
ASTM A350 LF2	ASME B16.11	Low-temperature service	-46°C
ASTM A106 Gr.B	ASME B36.10M	Seamless construction	595°C
API 5L Gr.B	API 5L	Line pipe connections	82°C (sour service limits)

Chemical Composition (ASTM A105)

Element	Composition (%)
Carbon (C)	≤0.35
Manganese (Mn)	0.60-1.05
Phosphorus (P)	≤0.035
Sulfur (S)	≤0.040
Silicon (Si)	0.10-0.35
Copper (Cu)	≤0.40
Nickel (Ni)	≤0.40
Chromium (Cr)	≤0.30
Molybdenum (Mo)	≤0.12
Vanadium (V)	≤0.08

Manufacturing Process

Huaxia-Steel swage nipples are produced through controlled manufacturing processes ensuring dimensional accuracy and mechanical integrity:

Raw material selection: Seamless pipe or forged bar stock from certified mills
Heat treatment: Normalizing at 850-920°C for grain refinement
Forming: Hot forging or cold forming to swage geometry
Machining: CNC turning for precise thread profiles (NPT, BSPT per ASME B1.20.1)
Surface finishing: Shot blasting, phosphating, or black oxide coating
Inspection: Dimensional CMM, thread gauge check, hydrostatic test (if required)
Marking and certification: Size, grade, heat number, standard compliance

Fig 3

Applications

Oil and gas pipelines: Size reduction at valve stations, meter runs
Petrochemical plants: Instrument connections, sample probes
Power generation: Steam and condensate line transitions
Water treatment: Pump suction and discharge connections
Shipbuilding: Bilge, ballast, and fuel line size changes
HVAC systems: Refrigerant and compressed air lines

Quality Assurance

Material certificates: EN 10204 3.1 mill test certificates standard; 3.2 available
Dimensional inspection: CMM verification against ASME B16.11
Thread inspection: Go/no-go ring and plug gauges per ASME B1.20.1
Surface examination: Visual inspection per MSS-SP-55
Hydrostatic testing: Available on request (1.5× design pressure)
Third-party inspection: SGS, BV, TUV, DNV coordination available

Packaging and Shipping

Individual PE bag or bubble wrap protection
Wooden cases or plywood pallets for export
Thread protectors (plastic or steel) on all threaded ends
Marking: Size, grade, heat number, standard, quantity per bundle
Net weight, gross weight, and cubic measurement on packing list
Container loading: 20’GP or 40’HQ optimized for weight and volume

Ordering Information

When requesting a quotation, please specify:

Large end size and small end size
Type (concentric or eccentric)
End connection (NPT, BSPT, plain, or combination)
Pressure class (2000#, 3000#, 6000#)
Material grade (A105, A234 WPB, A350 LF2)
Quantity and delivery terms
Special requirements (coating, testing, certification)

Ready to order carbon steel swage nipples? Request a quote with your specifications and quantity. Our engineering team confirms compatibility with your piping system and delivers competitive pricing with 2-4 week lead times.