Hardened Sleeve with 1.283-16 UN External Thread and 6 Key Internal Spline
Alloy steel sleeve with 1.283-16 UN 2A external thread, 6 key internal spline at 180 degree symmetry, full length coaxiality 0.015 mm, 4X M4 and 2X Ø4 dowels on the flange. Quote in 24 hours.
General Industrial Components
A multi step Ø44.9 by 80 mm sleeve combining a large lead external thread, an internal six key spline bore, and a flanged end with symmetric threads and dowels. One setup turn milling and precision grinding keep every axis aligned.
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Key Specifications
| Parameter | KGL Capability |
|---|---|
| Material | Alloy steel 40Cr, surface hardened |
| Process | Turn mill one setup, spline broaching or 5 axis milling, heat treatment, precision grinding on mandrels |
| Dimensions | Ø44.9 mm x 80 mm approx |
| External thread | 1.283-16 UN, class 2A |
| Internal spline | 6 keys, 180 degrees apart |
| Coaxiality | Ø0.015 mm full length |
| Flange holes | 4X M4 x 0.7 6H, 2X Ø4.0 mm dowel |
| Inspection | UN ring gauge, spline plug gauge, CMM on coaxiality, PCD, and dowel position |
| 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 |
| MOQ | No MOQ; 1-piece prototypes supported |
| Quote | Within 24 hours for complete 2D/3D files |
About This Part
Sleeves that couple torque and location at the same time are all about shared axes. This one stacks a 1.283-16 UN special external thread on the nose, an internal six key spline through the bore with the keyways 180 degrees apart, and a flange end carrying 4X M4 x 0.7 6H threads and 2X Ø4.0 mm dowel holes. Everything shares one axis, held to 0.015 mm or better over the full 80 mm length.
The part runs on a turn mill center in one clamping: outer steps, thread, relief grooves, and center bore first, then the spline profile broached or milled, then the flange holes. Hardening follows, and the bearing diameters are finish ground on precision mandrels so the thread, steps, and spline never drift off axis.
The 180 degree keyway symmetry is phase locked to the flange hole pattern, so the dowels land where the mating assembly expects them. Inspection uses a 1.283-16 UN ring gauge on the thread, a dedicated spline plug gauge on the bore, and the CMM on full length coaxiality, bolt circle, and dowel position.
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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
- 1.283-16 UN 2A external thread, gauge checked 100 percent
- Internal 6 key spline, keyways 180 degrees apart, plug gauge verified
- Full length coaxiality 0.015 mm after hardening and grinding
- 4X M4 x 0.7 6H and 2X Ø4.0 mm dowels phase locked to the spline
- Hardened and finish ground bearing diameters
Typical Applications
- Torque coupling sleeves in industrial automation shafts
- Threaded spline adapters for drive and actuator assemblies
- Position critical stepped sleeves with flange mounting
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 |
| Lead Time | Prototypes 7 to 15 days; production scheduled by volume |
Common Questions
Why a special 1.283-16 UN thread?
It is the mating standard on the customer drive line. We cut it to class 2A and check every part with a ring gauge rather than sampling, because a single oversize thread fails the whole assembly.
How does the spline stay aligned with the thread after hardening?
The bearing diameters are ground on a precision mandrel after heat treatment, which resets every diameter to the shared axis established in the first setup.
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