Custom Titanium Fittings: Threads, Sealing Surfaces and CNC Machining Requirements

Titanium fittings are connection components used to join tubes, pipes, valves, housings and other mechanical parts. Depending on the application, a fitting may include external or internal threads, a precision bore, a shoulder, a sealing face, a taper, a groove or a custom connection profile.

Sunrise Industrial manufactures custom titanium fittings according to customer drawings, samples and project requirements, supporting CNC turning, turn-mill machining, milling, finishing and dimensional inspection for prototype and OEM production.

Threaded Connections Internal & external threads
Precision Bores Tube & mating fit
Sealing Features Faces, shoulders & seats
OEM Supply Samples to repeat batches

What Is a Custom Titanium Fitting?

A titanium fitting is a machined connection component used to join, adapt, redirect or terminate another part. Some fittings are simple threaded connectors, while others combine different diameters, bores, shoulders, sealing areas or side features in one component.

The final design depends on the connected parts, the required flow or mechanical interface, the installation method and the operating environment.

Fitting Feature Manufacturing Focus
External or Internal Thread Thread size, pitch, fit and burr control
Bore or Passage Inside diameter, concentricity and surface condition
Shoulder or Step Axial location and mating depth
Sealing Face Flatness, finish and dimensional control
Side Hole or Flat Indexed position and secondary machining

Why Titanium Is Used for Fittings

Titanium may be selected for fittings where corrosion resistance, reduced weight and mechanical performance are important. This can be useful in chemical, marine, vacuum, medical-related, energy and other specialized systems, depending on the design and operating conditions.

The correct titanium grade should be confirmed from the customer's engineering specification. Commercially pure titanium and Grade 5 Ti-6Al-4V may be selected for different functional requirements.

The Mating Parts Define the Fitting

A fitting should not be designed or quoted only from its outside shape. The connected tube, pipe, valve, housing, hose, shaft or threaded part determines the critical interface dimensions.

For example, an external-thread fitting may need to match an internal thread with a defined class and engagement length, while a tube connector may need a controlled bore, shoulder or sealing surface.

Design Point

Always provide the mating-part information when possible. Thread standard, tube size, sealing method and assembly direction can affect the fitting design more than the outside profile alone.

CNC Turning of Titanium Fittings

Most fittings contain rotational features, making CNC turning the main starting process. Turning can produce outside diameters, bores, shoulders, tapers, grooves, chamfers and many external or internal threads.

Stable workholding and suitable cutting conditions are important because titanium fittings may combine thin walls, deep bores and multiple precision surfaces in a relatively small part.

CNC turning a custom titanium threaded fitting

Thread Standards and Thread Fit

Threaded fittings may use metric, imperial, pipe or other project-specific thread standards. The drawing should identify the thread form, nominal size, pitch, tolerance or class and the intended mating component.

A thread can be dimensionally correct and still be unsuitable if the mating standard is different. It is therefore important to confirm whether the fitting is intended for a threaded tube, valve body, nut, housing or another custom component.

Thread gauges and functional mating checks can be used according to the drawing and inspection requirements.

Bores, Shoulders and Internal Features

A fitting's internal bore may control flow, locate a tube, receive another component or create a specific wall thickness. Internal shoulders and steps can define insertion depth or provide a sealing location.

Deep bores and narrow internal features may require special tooling and careful chip evacuation. These details should be reviewed together with the required tolerance and surface finish.

Sealing Faces and Surface Finish

Where a fitting seals against a gasket, O-ring, metal face or another precision surface, flatness, roughness and edge condition can be functionally important.

The drawing should identify the actual sealing area and its requirements rather than applying one general surface-finish value to every surface. This helps keep the manufacturing process practical while protecting the critical interface.

Turn-Mill Features on Complex Fittings

Some fittings combine turned diameters with flats, side holes, slots, indexed holes or other non-rotational details. For these parts, turn-mill machining or secondary milling may be used to control the relationship between the round and milled features.

Keeping related features within a coordinated process flow can reduce repeated handling and help maintain angular or positional accuracy.

Wall Thickness and Material Removal

Thin-wall fittings can be more sensitive to distortion and vibration than solid or heavy-wall designs. Large differences between raw material diameter and finished geometry may also increase material removal and machining time.

Reviewing wall thickness, bore depth and raw-material size before production can help balance strength, weight, machining time and cost.

Inspection of Titanium Fittings

Inspection may include outside diameter, bore size, thread acceptance, shoulder position, sealing-face dimensions, hole location and surface finish.

Calipers, micrometers, bore gauges, thread gauges and other precision tools can be used for routine checks. More complex feature relationships may require optical inspection or CMM measurement according to the drawing.

Functional mating checks are especially useful when the fitting must connect directly to an existing tube, valve, housing or threaded part.

Thread and dimensional inspection of a CNC machined titanium fitting

Common RFQ Details That Affect Cost

Requirement Possible Manufacturing Effect
Deep or narrow bore Special tooling and additional machining time
Fine thread or tight thread fit More controlled machining and inspection
Thin wall or delicate sealing area Greater sensitivity to distortion and handling
Side holes or flats Secondary milling or turn-mill operations
Special documentation or testing Additional inspection and reporting work

Prototype Before Repeat Production

A prototype or small trial batch can help confirm thread engagement, sealing performance, insertion depth and fit with the customer's existing assembly.

After the design and inspection method are approved, the same machining process can support repeat OEM orders and replacement-part supply.

What to Include in a Titanium Fitting RFQ

  • 2D drawing with dimensions and tolerances
  • STEP or other 3D model when available
  • Titanium grade and material specification
  • Thread standard, size, pitch and fit requirement
  • Bore, tube or mating-part dimensions
  • Sealing method and critical sealing surfaces
  • Surface-finish and deburring requirements
  • Prototype quantity
  • Expected repeat quantity

Custom Titanium Fittings from Sunrise Industrial

Sunrise Industrial manufactures custom titanium fittings, threaded connectors, adapters and other mixed-feature components according to customer drawings and samples. Our capabilities include CNC turning, turn-mill machining, milling, grinding, surface finishing and dimensional inspection.

We support prototypes, small batches and repeat OEM production in titanium as well as stainless steel, aluminum, copper, engineering plastics and other specified materials.

Need Custom Titanium Fittings?

Send us your drawing, thread standard, mating-part details, titanium grade, quantity and sealing requirements. We can review the fitting geometry, machining process and inspection method before quotation.

Request a Quote

About Sunrise Industrial

Sunrise Industrial is an ISO 9001:2015 precision CNC machining and custom component manufacturer specializing in titanium machining. We manufacture prosthetic components, titanium dental discs, sputtering targets, titanium anodes, fasteners, fittings and other custom CNC machined parts according to customer drawings and specifications.