CNC Machined Connectors
Connector materials with exact grades: 6061-T6 aluminum, 303 & 316L stainless, 4140 steel, C36000 brass, Grade 5 titanium
CNC turning and turn-milling with live tools for threads, cross holes and hex forms
±0.005 mm on critical dimensions; NPT, BSPP, BSPT, metric and UN thread accuracy with tight sealing seats
Passivation, electroless nickel, zinc plating, anodizing and tarnish-resistant finishes
We manufacture custom CNC machined connectors from customer drawings and CAD files, including threaded pipe connectors, hydraulic hose connectors and adapters, pneumatic couplings, compression tube fittings, cable glands, electrical connector shells and contacts, RF and coaxial connector bodies, feedthrough connectors, quick-disconnect couplings, banjo fittings and grounding connectors. Our CNC turning, turn-milling and thread-cutting capabilities produce leak-tight, accurately threaded connectors for hydraulics, pneumatics, instrumentation, electrical and electronics applications.
A connector joins lines, components or circuits, so thread class and pitch, sealing-seat geometry, bore concentricity, cross-hole position and surface finish decide whether it seals, torques correctly and holds pressure. We machine connectors from aluminum (6061-T6, 6082-T6, 7075-T6), stainless steel (303, 304, 316L, 17-4 PH), carbon and alloy steel (1045, 4140, 4340), brass (C36000, C46400), copper (C10100, C11000) and titanium (Grade 2, Grade 5), machined from solid bar - so threads and seats are cut precisely to the drawing for prototypes and low-volume production. Parts are manufactured to specified dimensions, tolerances, materials and finishing requirements, with material certificates available on request.
Types of CNC Machined Connectors We Manufacture
We machine a wide range of connector types. Below are the most common; if your drawing shows a different configuration, send it for review.
Threaded Pipe Connectors
NPT, BSPP, BSPT and metric-thread pipe connectors.
Materials: C36000 · 303 · 316L · 4140
Hydraulic Hose Connectors
Hose ends, stems and adapters for hydraulic circuits.
Materials: 4140 · 4340 · 316L · 1045
Pneumatic Couplings
Push-in and threaded couplings for air systems.
Materials: C36000 · 6061-T6 · 303 · 304
Compression Tube Fittings
Ferrule seats and fitting bodies for instrumentation tubing.
Materials: 316L · 304 · C36000 · 4140
Cable Glands
Sealed entry bodies and locknuts for cables.
Materials: C36000 · 303 · 316L · 6061-T6
Electrical Connector Shells
Connector bodies, shells and back shells for wiring.
Materials: 6061-T6 · C36000 · C11000 · 303
RF & Coaxial Connector Bodies
Precision bodies for coaxial and RF assemblies.
Materials: C36000 · C10100 · C11000 · Grade 5 titanium
Feedthrough Connectors
Pressure and vacuum feedthrough bodies for vessels.
Materials: 316L · 304 · 17-4 PH · C36000
Quick-Disconnect Couplings
Half-coupling bodies for fast line connections.
Materials: C36000 · 316L · 4140 · 6061-T6
Banjo & Elbow Connectors
Banjo bolts, elbows and tees with cross flow holes.
Materials: C36000 · 4140 · 303 · 316L
Grounding & Busbar Connectors
Conductive clamps and lugs for earth and power links.
Materials: C11000 · C10100 · C36000 · 6061-T6
Custom Machined Connectors
One-off adapters and connectors from solid bar.
Materials: 17-4 PH · 7075-T6 · Grade 5 titanium · 4340
Have a Custom Connector? Send Your Drawing
CNC Machining Processes for Connectors
CNC Turning
Best for: ODs · bores · noses · faces
The primary process for round connector bodies and seats in one setup.
Live-Tool Turn-Milling
Best for: Cross holes · flats · slots
Machines cross drilled holes, hex flats and banjo passages without re-fixturing.
Thread Turning & Cutting
Best for: NPT · BSPP · metric threads
Single-point threads with correct class, taper and lead for seal integrity.
Thread Milling & Tapping
Best for: Internal threads · blind holes
Accurate internal threads including oversized and special profiles.
Boring & Reaming
Best for: Precision bores · ferrule seats
Fitting bores held to H7 concentric with threads and sealing faces.
Deburring & Edge Finishing
Best for: Thread run-outs · flow passages
Burr-free threads and internal passages so seals seat and fluid flows clean.
CNC Connector Materials
For connectors, material selection depends on fluid or circuit type, pressure, corrosion environment, conductivity and thread wear. We machine connectors from the metal materials listed below - aluminum, stainless steel, carbon and alloy steel, brass, copper and titanium.
| Material | Common Grades | Typical Connector Applications | Key Advantages |
|---|---|---|---|
| Aluminum | 6061-T6 · 6082-T6 · 7075-T6 | Pneumatic couplings, electrical shells, lightweight adapters | Light weight with good strength; anodizes for wear-resistant threads |
| Stainless Steel | 303 · 304 · 316L · 17-4 PH | Instrumentation fittings, hygienic and marine connectors | Corrosion resistance; 316L suits chloride environments; 17-4 PH adds strength |
| Carbon & Alloy Steel | 1045 · 4140 · 4340 | Hydraulic hose connectors and high-pressure adapters | High strength for pressure, torque and thread durability |
| Brass | C36000 free-cutting brass · C46400 naval brass | Pipe connectors, cable glands, pneumatic couplings | Excellent machinability, corrosion resistance, reliable threads |
| Copper | C10100 (OFHC) · C11000 electrolytic copper | Grounding connectors, busbar links, conductive bodies | High electrical and thermal conductivity |
| Titanium | Grade 2 (CP) · Grade 5 (Ti-6Al-4V) | Marine, chemical and lightweight corrosion-critical connectors | Outstanding corrosion resistance with the best strength-to-weight |
Our material scope. We machine connectors from aluminum, stainless steel, carbon and alloy steel, brass, copper and titanium, machined from solid bar. For a special grade, send your drawing for review.
Connector Threads, Sealing Seats & Geometry
A connector is defined by its threads and sealing features. The items below decide whether it torques, seals and holds pressure. We machine them to drawing, and tighter on request.
| Feature | Typical Capability | Why It Matters for Connectors |
|---|---|---|
| Parallel Threads (BSPP, UN, Metric) | ISO 6g / 6H class or per drawing | Correct torque and thread engagement with mate parts |
| Tapered Threads (NPT, BSPT) | Hand-tight and wrench flats per standard | Seal on thread flanks when torqued with sealant |
| Sealing Seat / Cone (24°, 60°) | Angle ±0.1°; surface Ra 0.8–1.6 μm | Metal-to-metal seats seal without leakage |
| O-Ring Grooves | Profile and depth ±0.05 mm | Repeatable seal compression on port faces |
| Bore Diameter | H8 (precision to H7); ±0.01–0.02 mm | Correct flow area and tube fit |
| Concentricity Thread to Bore | 0.02–0.05 mm TIR (precision to 0.01 mm) | Lines align and seals seat square |
| Cross-Hole Position | ±0.05–0.1 mm | Banjo and cross passages align with mating ports |
| Hex / Wrench Forms | Across-flats ±0.1–0.2 mm | Correct assembly torque with standard tools |
| Surface Roughness | Ra 0.8–3.2 μm; Ra 0.4–0.8 μm on request | Sealing seats and threads seal cleanly |
| Critical Dimensions | ±0.01 mm (precision to ±0.005 mm) | Gauge-quality and alignment features |
Critical Features We Control
Thread Accuracy - NPT, BSPP, BSPT, metric ISO 261 and UN/UNF threads cut to class with correct taper, lead and finish.
Sealing Seats - cones, seats and O-ring grooves machined to angle, depth and low roughness for metal-to-metal or O-ring seals.
Concentricity - threads, bores and seats turned in one setup so lines align and seals seat square.
Cross Passages - banjo and cross holes drilled and deburred so flow paths intersect cleanly.
Hex & Torque Forms - hex flats, wrench flats and slots cut to dimension for correct assembly torque.
Identification - part numbers or laser marking on request for traceability and assembly.
Heat Treatment & Stress Relief for CNC Connectors
High-pressure steel connectors are heat treated as specified by the drawing. Stress relief before thread finishing keeps accuracy in finished parts.
| Heat Treatment | Applicable Grades | Typical Connector Parts | Benefit |
|---|---|---|---|
| Quench & Temper | 1045 · 4140 · 4340 | Hydraulic connectors and adapters | Higher strength for pressure and torque loading |
| Solution + Aging | 17-4 PH · 7075-T6 | High-strength stainless and aluminum connectors | Strength with corrosion resistance |
| Stress Relieving | All steel grades · 6061-T6 | Long adapters before thread finishing | Improves concentricity and dimensional stability |
| Normalizing | Carbon steel bar | General-purpose connectors | Uniform structure and machinability |
Surface Finishes for CNC Connectors
Surface finish protects connectors and improves thread and seat corrosion behavior - while keeping sealing surfaces machined to standard roughness.
| Surface Finish | Applicable Materials | Typical Connector Parts | Main Benefit |
|---|---|---|---|
| Electroless Nickel Plating | 4140 · 4340 · 1045 · C36000 · Aluminum | Hydraulic and high-pressure connectors | Uniform corrosion protection; consistent torque |
| Zinc Plating (Clear / Yellow) | 1045 · 4140 · 4340 | General-purpose steel connectors | Economical corrosion protection |
| Passivation | 303 · 304 · 316L · 17-4 PH | Instrumentation and marine connectors | Removes free iron, improves corrosion resistance |
| Anodizing (Type II / Hard III) | 6061-T6 · 6082-T6 · 7075-T6 | Aluminum couplings and shells | Wear-resistant threads; color options |
| Chemical Conversion (Chromate) | Aluminum grades | Electrical connector shells | Conductive corrosion protection |
| Tin / Silver Plating | C36000 · C11000 · C10100 | Electrical and RF connector bodies | Solderability and low contact resistance |
| Black Oxide | 1045 · 4140 · 4340 | Industrial machinery connectors | Economical corrosion protection; low buildup |
| Polishing | 304 · 316L · Brass | Decorative and clean-service connectors | Smooth, bright, easy-to-clean surface |
Connector Quality Control
We inspect threads, sealing seats, concentricity and cross passages throughout production to ensure connectors meet the drawing and seal correctly. For documented projects, we can supply material certificates and inspection records to support your incoming inspection.
| Inspection Item | Equipment / Method | Typical Connector Parts |
|---|---|---|
| Thread Inspection | Go/No-Go Thread Gauges · Thread Micrometer | NPT, BSPP, BSPT, metric threads |
| Sealing Seat Angle & Finish | Profile Projector · Roughness Tester | Cone seats, port faces |
| O-Ring Groove Profile | Profile Gauge · CMM | Sealed port faces |
| Bore & Concentricity | Bore Gauge · Indicator · CMM | Fitting bodies and hose stems |
| Cross-Hole Position | CMM · Height Gauge | Banjo fittings and cross passages |
| Hex Dimensions | Caliper · Micrometer | Hex bodies and wrench flats |
| Surface Roughness | Roughness Tester | Sealing seats and threads |
| Pressure Spot Check | Pressure Test (on request) | Hydraulic connector batches |
| Material Verification | Spectrometer + Material Certificate | Incoming raw material (EN 10204 3.1 available) |
| Final Inspection | CMM + Inspection Report | Final dimensional acceptance |
Need documented quality control? Send us your drawings and inspection requirements.
Prototype & Low-Volume Connector Machining
Connector projects often start with prototypes - new port layouts, thread or seat fit checks, or replacements for obsolete parts that must be tested before production. Machining from solid bar avoids tooling lead times, so prototypes and low volumes are practical. We support prototype and low-volume CNC machining from single samples to repeat small-batch orders.
Prototype Machining
For new designs, validation and fit checks.
Typical Quantity: 1–10 pcs
Low-Volume Production
For pilot systems and initial production runs.
Typical Quantity: 10–1,000+ pcs
Repeat Production
For spare connectors and recurring orders with established designs.
Typical Quantity: Based on project requirements
Suitable for
Threaded pipe connectors and adapters
Hydraulic hose connectors and couplings
Pneumatic couplings and compression tube fittings
Cable glands and electrical connector shells
RF, coaxial and feedthrough connector bodies
Banjo, elbow, grounding and custom connectors
Packaging & Lead Time for CNC Machined Connectors
Packaging
Surface Protection: PE bags and protective film on plated and polished seats
Corrosion Protection: VCI paper for steel connectors in overseas transit
Thread Protection: Plastic thread protectors on request
Mixed Orders: Sorted by part number with labels and quantity checklists
Custom Packaging: Customer-specific packing requirements supported
Typical Lead Time
| Order Type | Typical Lead Time |
|---|---|
| Prototype | 5–10 working days |
| Low-Volume Order | 10–20 working days |
| Production Order | 15–30 working days |
| Repeat Order | 10–25 working days |
FAQ
Q: 1. What CNC machined connectors can you manufacture?
A: We manufacture custom threaded pipe connectors, hydraulic hose connectors and adapters, pneumatic couplings, compression tube fittings, cable glands, electrical connector shells, RF and coaxial connector bodies, feedthrough connectors, quick-disconnect couplings, banjo fittings and grounding connectors from customer drawings.
Q: 2. What materials do you machine connectors from?
A: We machine connectors from aluminum (6061-T6, 6082-T6, 7075-T6), stainless steel (303, 304, 316L, 17-4 PH), carbon and alloy steel (1045, 4140, 4340), brass (C36000, C46400), copper (C10100, C11000) and titanium (Grade 2, Grade 5).
Q: 3. Do you machine connectors from solid material?
A: Yes. We machine connectors from solid bar, so threads, seats and passages are cut directly to the drawing - practical for prototypes and low volume without forging or casting tooling.
Q: 4. What thread standards can you machine?
A: We machine NPT, BSPP, BSPT, metric ISO 261 and UN/UNF threads to ISO 6g / 6H class or per drawing, including tapered and parallel forms.
Q: 5. What tolerances can you achieve on threads and seats?
A: We hold ISO 6g / 6H thread classes, sealing-seat angles to ±0.1° with Ra 0.8–1.6 μm, concentricity of 0.02–0.05 mm TIR (precision to 0.01 mm), and ±0.01 mm (precision to ±0.005 mm) on critical dimensions.
Q: 6. Can you machine O-ring grooves and metal-to-metal seats?
A: Yes. We cut O-ring grooves to profile and depth (±0.05 mm) and machine 24° / 60° cones and flat seats to angle and finish for leak-tight connections.
Q: 7. Can you machine cross-drilled passages such as banjo fittings?
A: Yes. Our live-tool turn-milling drills and deburbs cross passages, banjo holes and flats in one setup, with positions held to ±0.05–0.1 mm.
Q: 8. Can you machine connectors for marine or corrosive environments?
A: Yes. 316L stainless steel, C46400 naval brass and titanium (Grade 2, Grade 5) connectors provide excellent corrosion resistance for marine and chemical service.
Q: 9. What surface finishes do you offer for connectors?
A: Electroless nickel, zinc plating, passivation, anodizing (Type II / Hard III), chemical conversion coating, tin / silver plating, black oxide and polished surfaces.
Q: 10. Can you pressure test connectors?
A: Yes. Pressure spot checks on production batches are available on request for hydraulic and pneumatic connectors.
Q: 11. Can you supply material certificates and inspection reports?
A: Yes. We can provide material certificates (EN 10204 3.1), dimensional inspection reports, CMM reports and thread-gauge records on request.
Q: 12. Do you accept 2D drawings and CAD files?
A: We can work from common STEP, STP, IGES, IGS, SolidWorks, DXF and 2D drawing files.
Q: 13. What is the typical lead time for CNC machined connectors?
A: Typical lead times are 5–10 working days for prototypes, 10–20 working days for low-volume orders, and 15–30 working days for production orders, depending on complexity, quantity, material and finishing.
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