Product features
- Equal-size tube-to-tube connection
- Straight union geometry
- No threaded pipe port
EOAT & Factory Automation ComponentsSelection · Sourcing · RFQ Support
Pneumatics
APU Equal Straight Union Fittings
APU unions join two pneumatic tubes of the same outside diameter in a straight line. Metric and inch sizes are listed separately.
Series
APU
Listed models
12
Configuration
Push-in connection
Selection
Catalog order codes
Model, PN and application context confirmed during inquiry.
Overview
Understand the APU product family
APU unions join two pneumatic tubes of the same outside diameter in a straight line. Metric and inch sizes are listed separately.
Selection approach
Match both tube outside diameters to the same listed size. Review overall length and the connection drawing before specifying the fitting.
All values shown below are traceable to the reviewed Catalog source. Missing information is not inferred.
Applications
Pneumatic tube connectionsAir-line routingVacuum-line connections
Product Selection Tool
Compare APU Models
Match both tube outside diameters to the same listed size. Review overall length and the connection drawing before specifying the fitting.
| Model | PN | D | A | X | Status |
|---|---|---|---|---|---|
| APU04 | Confirm by material / quotation | 4 mm | 32.8 | 9.9 | Confirmed |
| APU06 | Confirm by material / quotation | 6 mm | 35.6 | 11.9 | Confirmed |
| APU08 | Confirm by material / quotation | 8 mm | 39.1 | 13.9 | Confirmed |
| APU10 | Confirm by material / quotation | 10 mm | 47.8 | 16.9 | Confirmed |
| APU12 | Confirm by material / quotation | 12 mm | 48.8 | 19.9 | Confirmed |
| APU14 | Confirm by material / quotation | 14 mm | 49 | 21.8 | Confirmed |
| APU16 | Confirm by material / quotation | 16 mm | 50.4 | 23.9 | Confirmed |
| APU5/32 | Confirm by material / quotation | 5/32 in | 32.8 | 9.9 | Confirmed |
| APU1/4 | Confirm by material / quotation | 1/4 in | 34.9 | 11.9 | Confirmed |
| APU5/16 | Confirm by material / quotation | 5/16 in | 38.4 | 13.9 | Confirmed |
| APU3/8 | Confirm by material / quotation | 3/8 in | 47.8 | 16.9 | Confirmed |
| APU1/2 | Confirm by material / quotation | 1/2 in | 49.4 | 19.9 | Confirmed |
Continue to Engineering Reference to verify drawings, dimensions and technical notes before quotation.
Engineering Reference
Technical Data & Dimensions
Review the engineering sheets for the selected model. Confirm dimensions, connections and the applicable configuration before quotation.
Dimensions & Drawings
Model / PN Reference
Technical Notes
Applicability
Pneumatic Fittings 2025, printed page 17: APU04, APU06, APU08, APU10, APU12, APU14, APU16, APU5/32, APU1/4, APU5/16, APU3/8, APU1/2
Pneumatic Fittings 2025, printed page 01: APU04, APU06, APU08, APU10, APU12, APU14, APU16, APU5/32, APU1/4, APU5/16, APU3/8, APU1/2
Technical specifications
| Fluid | Air and vacuum |
|---|---|
| Operating pressure | 0–1.0 MPa |
| Negative pressure | -100 kPa |
| Catalog maximum pressure | 1.5 MPa; separate from the operating range, not a burst-pressure rating |
| Operating temperature | 0–60°C |
| Applicable tube | Polyurethane and nylon |
| Materials reference | The family structure drawing identifies PBT, brass, NBR, POM, zinc and SUS at individual components; use the drawing for component locations. |
APU — Models & Engineering Reference
Listed models, selection data and applicable dimensional reference. · Pneumatic Fittings 2025, printed page 17
High-resolution web preview · Pneumatic Fittings 2025, printed page 17
Plastic Push-in Fittings — Operating Conditions & Structure
Common family reference; apply the product-specific notes and model tables. · Pneumatic Fittings 2025, printed page 01
High-resolution web preview · Pneumatic Fittings 2025, printed page 01
Technical confirmation notes
- Operating pressure and the catalog maximum pressure are separate values. Choose tubing and connections for the actual operating conditions.
- Tube outside diameters are marked in mm or inches. Interpret the remaining dimension symbols using the engineering drawing; an inch tube size does not make every drawing dimension an inch value.
Product Inquiry
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