Precision Brass Flow Control Adapters

Precision brass flow control adapters, turn-mill machined in one setup: coaxiality 0.008 mm, orifice plus or minus 0.005 mm, leak tested. Quote in 24 hours, no MOQ.

Brass flow control adapter, thread and seal groove side

Semiconductor & Optics

KGL machines precision brass flow control adapters from C3604 / H59-1 bar in a single turn-mill setup: thread, seal groove, and center orifice cut in one clamping, coaxiality 0.008 mm, orifice tolerance plus or minus 0.005 mm, every adapter leak tested before shipment.

Custom to drawing±0.005 mm standard toleranceQuote in 24 hNo MOQISO 9001 · ISO 13485 · AS9100D

Request a Quote for This Part

Or email drawings to kgl@kglmfc.com

Relevant Capabilities

Turn-Mill Machining CNC Turning

Materials

Brass & Copper Alloys Surface Treatment/Passivation

Key Specifications

Parameter	KGL Capability
Material	Free-cutting brass C3604 / H59-1 / HPb59-1, RoHS compliant
Condition	Machined finish, stress relieved
Process	Swiss turning / turn-mill in one setup; step turning; thread and seal groove cutting; center orifice and nozzle steps; ultrasonic cleaning; passivation or anti-oxidation
Size	Per drawing, typically 15 to 35 mm outer diameter
Coaxiality	0.008 mm max on steps and threads
Orifice Tolerance	Plus or minus 0.005 mm on center throttle bore
Surface Roughness	Ra 0.8 to 1.6 um; Ra 0.4 on sealing steps and journals
Standard Tolerance	Plus or minus 0.005 mm on machined features
Inspection	Leak test, thread go / no-go gauges, vision measuring system or tool microscope
MOQ	No MOQ; 1-piece prototypes supported
Tolerance	±0.005 mm standard on metals, engineering plastics, and carbon fiber composite
Certifications	ISO 9001:2015, ISO 13485:2016, AS9100D
Capacity	100+ CNC machines including 11 five-axis centers
Quote	Within 24 hours for complete 2D/3D files

About This Part

The flow control adapter meters gas or liquid through a central orifice and a fine external thread seat. It looks simple on a drawing and punishes loose process control in service: if the thread, the seal groove, and the orifice do not run true to a common axis, the assembly weeps or hunts. KGL machines each adapter from free-cutting brass bar (C3604 / H59-1 / HPb59-1, RoHS compliant) chosen for clean chip formation and uniform, seal-ready surfaces.

The route is built around single-setup discipline. Swiss turning or turn-mill work completes the outer diameters and stepped shoulders in one clamping. The external thread and seal groove are cut next, still without moving the part, so runout between thread and shoulder stays inside 0.008 mm. The axial center orifice and nozzle steps are drilled and chamfered in the same setup, holding the orifice diameter to plus or minus 0.005 mm for repeatable throttling. After machining, every adapter is ultrasonic cleaned, then passivated or given an anti-oxidation treatment per drawing.

Adapters are leak tested with air under water or on a pressure decay bench, threads are checked with go and no-go gauges, and orifice and step dimensions are verified on a vision measuring system or tool microscope. Material certificates travel with each order. Send your drawing for DFM feedback and a quotation within 24 hours.

This part family supports the Semiconductor Parts industry. Read how KGL machines parts for that sector, then send your drawing for a quote.

Why Machine It at KGL

Five-Axis Fleet

100+ CNC machines including 11 five-axis centers run complex geometry in single setups, so tolerances do not stack up across refixturing.

Verified Accuracy

±0.005 mm standard on metals, plastics, and carbon fiber composite, verified on Hexagon and Zeiss CMMs (0.0015 mm accuracy).

Fast Prototypes

Engineering feedback with every quotation; prototype parts typically machined in 15 to 25 days.

One Supplier, End to End

Material sourcing, machining, heat treatment coordination, finishing, CMM inspection and export packaging under one roof.

Part-Specific Advantages

Free-machining brass with uniform sealing faces: airtight and watertight joints without secondary lapping.
Center orifice held to plus or minus 0.005 mm for stable throttling and repeatable flow.
External thread, seal groove, and locating steps cut in one clamping, coaxiality within 0.008 mm.
Stress relieved bar stock, so threads and shoulders hold geometry after unloading.
Ultrasonic cleaned and passivated or anti-oxidation finished; RoHS compliant material with certificates.

Typical Applications

Fittings for flow control, proportional, and pneumatic valves
Nozzle bases and metering adapters for industrial spray and dosing equipment
Connectors for gas analyzers, pressure regulators, and HVAC control valves
Replacement adapters for fluid and heating system control assemblies

Commercial Terms

Commercial	Detail
MOQ	No MOQ; 1-piece prototype supported
Quote	Within 24 hours for complete 2D/3D files
Terms	EXW / FOB Shenzhen
Certifications	ISO 9001:2015
Packaging	Individual bubble wrap, export carton or wooden case

Common Questions

Why brass for flow control adapters?

Free-cutting brass such as C3604 machines into sharp thread forms and smooth seal grooves at low cost, and its uniform structure seals well against elastomer or metal seats. It also resists corrosion in water and air service, especially after passivation.

How do you keep the thread and orifice on a common axis?

Everything runs in one clamping on a Swiss-type or turn-mill center. The thread, seal groove, and orifice are cut without re-chucking, so runout between features is a machine accuracy question rather than a setup error question, and stays within 0.008 mm.

Can you match an existing adapter?

Yes. Send the 2D drawing or a sample for reverse engineering. We confirm thread form, seal groove dimensions, and orifice diameter in a first-article report before batch production.

How do you verify sealing performance?

Every adapter is leak tested with air under water or on a pressure decay bench at the pressure stated on the drawing, and threads are checked with go and no-go gauges before packing.

What files do you need for a quote?

A 2D drawing with thread, seal groove, and orifice details, plus a 3D model in STEP or IGES if available. You get engineering feedback with the quotation, within 24 hours.