304 Stainless Bayonet Air Cylinder Adapter, CNC Turned
304 stainless bayonet air cylinder adapter: Ø1.25 in head, Ø0.625 in +0.003/0 stem, 0.938 in hex, 1/2-20 UNC-2B thread, bayonet U slots, RoHS. Quote within 24 hours, no MOQ.
Semiconductor & Optics
A bayonet style quick connect adapter for air cylinders, turned from 304 stainless: Ø1.25 in head, Ø0.625 in stem held +0.003/0, 0.938 in across flats hex, 1/2-20 UNC-2B thread, and milled U bayonet slots, delivered bright machined and RoHS compliant.
Or email drawings to kgl@kglmfc.com
Key Specifications
| Parameter | KGL Capability |
|---|---|
| Material | Stainless steel S/S 304 (06Cr19Ni10), solution annealed |
| Process | CNC turning of head, stem, and hex; drilling and tapping 1/2-20 UNC; milling of U bayonet slots and R0.09 grooves; chamfering 0.05/0.06 x 45 degrees; deburring |
| Key dimensions | Head Ø1.25 in (about Ø31.75 mm); stem Ø0.625 +0.003/0 in; hex 0.938 ±0.003 in across flats; section lengths 1.88 / 1.38 / 0.50 / 0.38 / 0.88 / 0.81 in |
| Thread | 1/2-20 UNC, Class 2 |
| Radii and grooves | 2×R0.09 grooves, 2×R0.03 radii, R0.19 corner |
| Surface finish | 63 CLA machined; 32 Ra on unmachined callouts |
| Compliance | RoHS |
| Inspection | Micrometer on diameters and hex; thread plug gauge; bayonet slot gauges |
| 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
Air cylinder tooling changes fast on automation lines, and the bayonet interface is what makes that safe: push in, twist, locked. This adapter is the stainless half of that joint, turned from 304 bar with the head, stem, and hex in one lathe flow, then milled for the U shaped bayonet slots and R0.09 grooves that lock the mating collar.
The stem that slides into the cylinder is held at Ø0.625 +0.003/0 in, a one sided band that keeps the fit snug without binding. The hex is 0.938 ±0.003 in across flats for wrench assembly, and the 1/2-20 UNC-2B threaded hole carries the pull load with Class 2 fit.
Surfaces run at 63 CLA machined finish with 32 Ra on unmachined callouts, chamfers at 0.05 and 0.06 by 45 degrees, and 304 stainless keeps the adapter corrosion free through years of shop air and coolant mist. Every piece is micrometer checked on the diameters and hex, plug gauged on the thread, and gauge checked on the bayonet slots before packing.
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
- Bayonet U slots and R0.09 grooves for fast, locked tool changes
- Stem at Ø0.625 +0.003/0 in for a snug sliding fit into the cylinder
- 1/2-20 UNC-2B threaded hole, Class 2, carrying the pull load
- 0.938 ±0.003 in hex across flats for wrench assembly
- 304 stainless, bright machined finish, corrosion resistant, RoHS compliant
- Micrometer, thread plug, and slot gauge inspection on every piece
Typical Applications
- Quick change adapters for air cylinders on automation equipment
- Bayonet connectors in pneumatic circuits
- Pneumatic source interfaces on semiconductor and assembly machines
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 304 for a pneumatic adapter?
Shop air carries moisture, and lines near coolant mist see worse. 304 resists both, keeps the bayonet surfaces bright so they stay easy to twist, and costs less than higher alloys.
What controls the bayonet lock feel?
The U slot geometry and the R0.09 locking grooves. Both are gauge checked piece by piece so every adapter locks with the same quarter turn feel.
Can you make this in 316 or with a vent hole?
Yes. Same route, different material or one more drilling op; send the revision and we quote within 24 hours.
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