6H Thread Fit Hex Threaded Adapter with Cross Port Position ±0.05 mm by Turn-Mill Combined Machining

Hex Adapter — Flats, Cross Port and Thread Relief in One Turn-Mill Setup

An adapter with hex flats and a cross port performs three jobs at once: it seals on a thread at each end, gives a wrench something to grip without crushing the thread, and lets fluid or air out through the side. Each function lives in a different machining operation, and each one can spoil the others — flats milled after threading can burr the thread crest; a cross port drilled after passivation drags chips into the bore; a relief groove cut too shallow stops the mating part before the seal seats.

We cut the threads with a proper relief groove, mill the hex and cross port with live tooling on the same lathe while the part is still held on its axis, and deburr the port intersection from inside before the part is released. The hex is measured across flats, the port position and clocking are checked on the CMM, and the assembly is pressure tested where the customer requests it.

ISO 9001:2015  •  SS303 / 304 / 316L, brass C36000  •  Pressure test on request  •  Exporting since 2008

• Material: SS303 for fine threads and free machining; SS304 and 316L for corrosion resistance; brass C36000 for potable water and instrumentation; 17-4PH where strength matters.
• Threads: metric, UN/UNF, NPT, NPTF, BSPP, BSPT, in any combination at the two ends.
• Bodies: hex, double hex, round with spanner flats, knurled, flanged, reducing or enlarging, elbow and banjo style.
• Ports: single cross port, twin opposing ports, angled port, port with restrictor, port with sintered insert pocket.
• Sealing: O-ring groove, bonded washer face, taper seat, flat gasket land, PTFE-lined thread.
• Size: thread M5 to M42 / 1/8 to 1-1/4 inch, length 15 mm to 150 mm.
• Input: drawing, 3D model, or a sample adapter we measure and re-model.

An adapter drawing reveals circuit layout, port sizes and test pressures — enough to describe a system, not just a fitting. We sign a mutual NDA before the file is opened, in English or Chinese or on your own form, and return a countersigned copy before work starts. Only the project engineer, the turn-mill programmer and the cell supervisor can access the file, which is held in a restricted folder rather than on the shop network. No photographs of customer parts are taken for our catalogue or website, customer parts are never displayed or reused as samples, subcontracting requires your written approval, and at program close files and inspection data are deleted or returned with written confirmation.

Dongguan Changxinda Precision Technology Co., Ltd has been machining custom parts since 2008: 15+ years, 90 to 100 staff, 50–60% exported to North America and Europe, 200+ customers served, turnover in the RMB 10–20 million band. The plant runs turn-mill combined centres with live tooling, CNC lathes, and 4-axis / 5-axis machining centres under an ISO 9001:2015 quality system, serving medical, robotics, automotive, aerospace, automation, laser, LED, lithium battery and precision instrument programs. Turning, hex milling, cross porting, passivation coordination and pressure testing are handled in our own plant in Dongguan.

Adapters and turned fittings from this plant ship into ten industries. Each line is a category we machine regularly, with the parts customers actually order.

All ten sectors run through the same plant and the same ISO 9001:2015 inspection discipline — only the material, finish and documentation package change.

• Prototype: 3–7 working days after drawing approval including passivation and gauging; 8–10 days with a pressure test package.
• Small batch 10–100 pcs: 7–14 working days.
• Repeat orders: run from archived programs, collets and thread tool lists — hex clocking and thread class repeat to the same values.
• Capacity: 10,000 pieces per month across the plant.
• Visibility: a dated progress note with photographs of your actual adapters at turning, porting and gauging.
• Shipping: threads capped, ports plugged, parts bagged, foam-lined export carton, express or air and sea per your forwarder.
• Rush: overtime slots and an express passivation line held weekly; tell us the deadline and we confirm before you order.