Product Overview
SMC KQ2H01-07A One-Touch In-Line Pneumatic Reducer Union 1/8 to 1/4 Inch Tube
Condition
Unused new old stock (NOS). Fitting bodies and orange collet release rings show clean, uninstalled surfaces. Label markings: KQ2H01-07A, (KQH1-29B), SMC FITTINGS, MADE IN SINGAPORE.
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Product Overview
SMC KQ2H01-07A is a KQ2 series different-diameter straight union fitting engineered to couple 1/8 inch OD pneumatic tubing directly to 1/4 inch OD tubing in a compact, in-line footprint. Featuring SMC one-touch push-in collet connections on both ends with distinct orange release rings, this push-to-connect reducer eliminates threaded step-down adapters and reduces potential leak paths across industrial pneumatic lines and automated machinery.
Key Features
- Fitting type: In-line different-diameter push-to-connect straight union reducer
- Port 1 connection: 1/8 inch outer diameter (OD) tubing push-in
- Port 2 connection: 1/4 inch outer diameter (OD) tubing push-in
- Operating pressure range: -14.5 psi to 145 psi (-100 kPa to 1.0 MPa)
- Proof pressure: 3.0 MPa
- Operating temperature: -5°C to 60°C
- Body construction: Lightweight polybutylene terephthalate (PBT)
- Release rings: Polyoxymethylene (POM), orange
- Fluid service: Compressed air, inert gases, water
Applications
- Stepping down pneumatic manifold feed lines to smaller actuator pilot circuits on assembly machines
- Plumbing 1/8 inch lines from compact miniature solenoid valves into 1/4 inch plant air drops
- Adapting pneumatic logic lines for DIY CNC router air blasts, benchtop dispensers, and maker automation rigs
Frequently Asked Questions
What tubing outer diameters does this union connect?
This fitting connects 1/8 inch OD tubing on one side to 1/4 inch OD tubing on the other.
Can this union handle vacuum service?
Yes. The operating pressure range extends down to -14.5 psi (-100 kPa), making it suitable for standard industrial vacuum and pick-and-place lines.
What is the difference between KQ2H01-07A and KQH1-29B?
KQ2H01-07A is the primary modern SMC part number, while KQH1-29B is SMC's legacy model cross-reference printed on the factory label for the identical fitting.
Nothing cleans up a rat's nest of pneumatic lines quite like stepping tube sizes down right where the run needs it. Push the tubing home and move on to wiring.
