0.01mm Coaxiality Locking Sleeve Body with 1.0mm Thin Wall and 6g Gauged Thread for Laser Connector Assembly

This sleeve body screws into the connector housing and carries the ferrule on its bore. Because it is threaded on the outside and bored on the inside, the two axes have to be the same axis: if the thread runs 0.03 mm off the bore, the sleeve tightens at an angle and the fiber tip tilts by the same amount times the length. There is no adjustment for that after assembly, so the coaxiality has to be built in.

We turn the OD, chase the thread, bore and ream the inside, mill the anti-rotation flats and cut the groove in one clamping on a turn-mill centre. With a 1.0 mm wall, that is the only reliable way to keep thread and bore on the same centreline and the bore still round when the part leaves the chuck.

1. Drawing and thread review. We confirm thread size and class, pitch diameter limits, bore fit, wall thickness and flat positions, then quote within one working day.
2. Material verification. 316L or 304 bar is checked against the mill certificate. 316L is specified where the part sees coolant or cleaning chemicals.
3. Cut, face and centre. Bar is sawn oversize, faced and centred, so the first pass runs true to the bar axis.
4. Rough turning. OD and bore are roughed with 0.3 mm of stock, then the part is allowed to cool before finishing so thermal growth does not close the bore.
5. Threading. The external thread is cut with a full-form insert or a thread mill at a controlled depth, with the pitch diameter checked against a ring gauge during the run rather than only at the end.
6. Bore finishing. The bore is drilled, bored and reamed in the same clamping as the thread, which is what holds coaxiality at 0.01 mm instead of the 0.03 to 0.05 mm typical of a second operation.
7. Flats, groove and chamfers. Anti-rotation flats and the retention groove are milled with live tooling, clocked to a datum so the flat orientation repeats from part to part.
8. Passivation and inspection. Passivation, then ring and plug gauges for the thread, CMM for the thread axis against the bore axis, roundness check on the bore, and a first article report with the batch.

Most coaxiality failures are not cutting errors; they are re-chucking errors. When a sleeve is turned on the OD in one operation and bored in a second, the second operation locates on a surface that has just been machined, and the runout of the chuck becomes the coaxiality of the part. On a 1.0 mm wall, chuck pressure also closes the bore into a three-lobed shape that reads fine on a two-point micrometer.

The fix is boring and threading in the same clamping on a turn-mill centre, with the part held in a collet or on a machined expanding mandrel rather than in hard jaws. We also cut the thread before the final bore pass, so the bore is finished last on a part that has already been stressed by threading. That order alone accounts for most of the difference between a sleeve that assembles smoothly and one that cross-threads.

Thread size and class, bore fit, wall thickness, groove profile, flat orientation, material grade, passivation and surface finish are all built to your drawing. One piece is a normal order with no tooling charge and no setup fee, and the prototype goes through the same gauge and CMM plan as production. If a thread and groove combination leaves too little wall, our engineer flags it before the bar is cut.

• NDA before files. Mutual non-disclosure is signed before drawings or samples are released.
• No public reference. Confidential sleeve bodies never appear in samples, catalogues, website photos or trade fairs.
• Separated cell. Sensitive work runs with named operators and project-coded programmes.
• Partner control. Passivation suppliers receive process specifications only, never assembly drawings.

Dongguan Changxinda Precision Technology Co., Ltd has produced turned and milled parts since 2008. Equipment includes CNC lathes with live tooling, turn-mill centres, four-axis and five-axis machining centres, with 90 to 102 employees working under ISO 9001:2015. More than 200 customers are served, 50 to 60 percent of output is exported, and annual sales are between USD 10 million and 20 million.

• Confirmed dates. Prototypes 4 to 7 working days, batch orders 14 to 22 working days after drawing approval.
• Repeat orders skip setup. Programmes, collets and gauges stay on file.
• Bar stock on hand. Common stainless diameters are stocked to shorten lead time.
• Early warning. If material, threading tools or passivation threaten the date, you hear it before the date is missed.
• Dispatch evidence. Photos, inspection report and packing list before shipment.

• ✅ Consumer Electronics: phone, tablet and laptop housings, heat sinks, camera brackets, VR/AR headset structural parts, smart wearable shells
• ✅ Automation & Industrial Equipment: automation fixtures, jigs, module frames, transmission sliders, motor mounts, sensor housings, conveyor line parts
• ✅ Semiconductor & Vacuum Equipment: vacuum chambers, vacuum fittings, precision equipment bases, thermal isolation and insulation parts, inspection fixtures
• ✅ Medical Devices: surgical instrument bases, diagnostic instrument housings, endoscope components, aesthetic device structural parts (medical-grade aluminum and stainless steel)
• ✅ Automotive: new energy motor housings, battery end plates, sensor brackets, lamp structural parts, tuning parts, hydraulic valve blocks
• ✅ Aerospace & UAV: aircraft structural parts, drone frames, landing gear parts, avionics instrument housings (lightweight precision parts)
• ✅ Optics & Photonics: optical lens barrels, lens mounts, light source heat sinks, camera module brackets, inspection optical benches
• ✅ Communications: 5G heat dissipation cavities, filter parts, signal adapter structural parts, telecom equipment housings
• ✅ Robotics: robot arm joint parts, robot bases, reducer housings, AGV structural parts
• ✅ Instrumentation: test equipment housings, precision gauge bases, flow meter parts, laboratory equipment accessories

Each sleeve body is bagged, seated in a foam tray with the thread protected, then sealed in a moisture barrier bag with desiccant. Trays fit a five-layer export carton marked with part number, quantity and batch code. Sea freight ships on fumigation-free plywood pallets; neutral cartons are available.