Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 165mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50
The AirTAC SAIJ125X165-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a highly versatile 115-165 mm usable travel window, enabling precise end-position tuning at commissioning without swapping out the physical actuator. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This variant is configured with a SUS420J2 stainless steel rod (material code A) for enhanced durability against surface corrosion and utilizes PT tapered port threads. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible switch mounting. While the rear adjuster screw sets the travel end and the variable air cushions handle deceleration, neither component can hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 165 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×165 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50 Is Used
Variable End-Stop Forming
Dial in the exact 115 to 165 mm retract position for metal forming or stamping operations where material thickness or bend angles dictate a changing stroke endpoint.
Product Changeover Automation
Rapidly reconfigure packaging or palletizing lines for different box sizes by adjusting the rear stopper screw, eliminating the need to physically swap out cylinders.
Commissioning Stroke Tuning
Fine-tune the final end-position during initial machine setup to perfectly align heavy fixtures, compensating for mechanical tolerances without adding external shock absorbers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50 the Right Cylinder?
Selecting this 125 mm bore actuator provides 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks. If your application requires less force, stepping down to a 100 mm bore yields 3927 N of push force, whereas moving up to a 160 mm bore provides 10053 N. You would specifically choose this adjustable-stroke SAIJ model over a fixed-stroke SAI when a machine requires variable end-stops to accommodate product-size changeovers without bolting on external stops.
For load-holding applications without continuous air pressure, this cylinder is insufficient as the rear adjuster acts strictly as a travel stop, not a locking mechanism; consider an AirTAC SAIL or BSAI series instead. To achieve a true ISO 15552 replacement match, verify the 125 mm bore, 165 mm nominal stroke, 50 mm adjustment range, PT G1/2 port, and your required mounting style. The SAIJ series supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, deliberately omitting FB, CA, CB, and CR options.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It operates at a speed range of 30-500 mm/s.
The rear adjuster screw allows you to shorten the nominal 165 mm stroke by up to 50 mm, creating a usable travel window of 115 to 165 mm. This stopper only limits the travel end and does not lock the load without live air pressure.
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