Thread Adapter Fittings
NPT, BSPP, BSPT, metric, UNF/UN thread conversions and custom thread combinations.
SWISS TURNED
Precision Adapter Fittings
Swiss CNC Machined Adapter Fittings for Fluid, Pneumatic & Precision Connection Systems
Custom precision adapter fittings, thread converters, reducing fittings and connection components manufactured to your drawings. Built for thread accuracy, sealing reliability and repeat production.
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OVERVIEW
Small diameter. Thread precision. Consistent production.
Ø3–32 mmTypical bar diameter
Up to 300 mmTypical machining length
±0.005 mmDrawing-dependent tolerance
Ra 0.4–1.6 μmTypical surface roughness
Parts We Manufacture
Each part is made to customer drawings, not from a standard catalog.
Reducer & Reducing Fittings
Diameter transition fittings for tube and hose connections with sealing features.
Compression Fitting Components
Ferrules, glands and compression fitting bodies for leak-free tube connections.
Flare Fitting Components
Flare nuts, flare bodies and 45°/37° flare fitting components.
Connector & Coupling Adapters
Male-female adapters, coupling nuts and quick-connect fitting components.
Custom Adapter Fittings
Special adapter fittings with non-standard threads or integrated features.
Applications
Our products serve industries that demand precision, reliability and repeat production.
Hydraulics & Pneumatics
Thread adapters, pressure fittings and connection components
Fluid Handling
Reducer fittings and transition components for fluid systems
Electronics & Connectors
Small precision adapters and coupling components
Automotive
Sensor fittings, fuel system adapters and positioning components
Industrial Equipment
Custom adapter fittings and precision connection hardware
Materials & Surface Finishes
Material selection is driven by application requirements, environment and performance needs.
Materials
Stainless Steel303 / 304 / 316
Aluminum6061 / 7075
Brass & CopperC3604 / C110 / custom brass alloys
Carbon & Alloy Steel12L14 / 1045 / 4140
Engineering PlasticsPOM / PEEK / Nylon
Surface Finishes
- Passivation (stainless steel)
- Anodizing (aluminum)
- Electroplating — nickel / zinc / tin
- Black Oxide
- Mechanical Polishing
- Heat Treatment
- Thread Coating & Locking Patch
- Degreasing & Cleaning
Available to drawing requirements through in-house and qualified partner processes.
Not sure which material or finish fits your application?
Talk to an EngineerManufacturing Capability
Our equipment is optimized for the requirements of this product family.
- Bar Diameter
- Ø3–32 mm
- Machining Length
- Up to 300 mm
- Typical Tolerance
- Down to ±0.005 mm*
- Surface Roughness
- Ra 0.4–1.6 μm*
- Thread Standards
- NPT · BSPP · BSPT · Metric · UNF/UN
- Production Volume
- Prototype to repeat production
- Equipment
- 50+ Swiss-type CNC machines
- Secondary Operations
- Cross-drilling · Milling · Tapping
* Final values are confirmed against the drawing, material, geometry and inspection plan during RFQ review.
View CapabilitiesWhy Buyers Choose Zhuocheng
Dedicated equipment for small-diameter precision fittings with complex thread features.
Experience with NPT, BSPP, BSPT, metric, UNF/UN thread standards and sealing-critical geometries.
Drawings reviewed for manufacturability, thread standards, tolerances and sealing requirements.
Support sample validation, pilot batches and long-term production programs.
Quality & Inspection Process
IncomingMaterial & certificate check
First ArticleThread & dimensional verification
In-ProcessCritical feature & thread control
FinalInspection before shipment
Typical Features
Representative parts from our production.
Thread Adapter
Reducer Fitting
Compression Ferrule
Flare Nut
Coupling Adapter
Male-Female Adapter
Miniature Fitting
Custom Adapter
Frequently Asked Questions
Can you manufacture adapter fittings to my drawing?
Yes. All adapter fittings are made to customer drawings and specifications. Send your drawing with thread standards, material and quantity.
What thread standards can you machine?
We routinely machine NPT, BSPP (G), BSPT (R), metric (M), UNF, UNC, UN and custom thread combinations.
Can you support pressure-tight and sealing-critical fittings?
Yes. For sealing-critical fittings, we pay special attention to thread geometry, sealing surface finish and concentricity.
What is the typical MOQ for precision adapter fittings?
For standard brass or stainless fittings, MOQ is usually 500–1,000 pcs. Prototype quantities can be discussed.
NEXT STEPHave an Adapter Fitting Drawing?
Send us your drawing, thread specification, material and quantity. Our engineering team will review the part and recommend the appropriate Swiss CNC process.