Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-75S
The AirTAC SAIJ125X150-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, providing 6136N of pull force and 8590N of push force at 0.7 MPa. The integrated -S magnet enables position detection with AirTAC CMSE reed or DMSE electronic solid-state sensors housed in the dual-side extruded barrel grooves. A PT tapered port thread and carbon steel rod come standard on this 125mm bore unit.
This specific SKU features a 150mm nominal stroke paired with a 75mm adjustment range, creating a highly flexible 75-150mm usable travel window. This vast tuning capability allows operators to dial in exact retract end positions during commissioning or product changeovers without swapping the cylinder or adding external stops. The rear screw acts purely as a travel stop for deceleration alongside the variable air cushions, meaning it will not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125X150-75S Is Used
Variable End-Stop Positioning
Ideal for diverter gates or forming presses where the retract distance must be tuned on the fly across a 75-150mm window to accommodate different material thicknesses.
Machine Changeover
Speeds up product family changeovers on packaging lines by allowing operators to dial in the exact stroke end position via the rear screw rather than swapping tooling.
High-Force Clamping Setup
Provides up to 6136N of pull force for heavy-duty clamping tasks, with the 75mm adjustment allowing precise control over the clamping depth during initial commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-75S the Right Cylinder?
Choose this 125mm bore model when an application demands high force alongside extreme stroke variability; stepping down to a 100mm bore drops the 0.5MPa push force to 3927N, which may be insufficient for heavy positioning tasks. The 75mm adjustment window is ideal for machines processing multiple product sizes on a single line, replacing the need to inventory several fixed-stroke SAI cylinders. For load-holding without continuous air pressure, this standard adjuster cannot function as a lock—consider an SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
When replacing an ISO 15552 cylinder, verify the 125mm bore, 150mm stroke, 75mm adjustment range, PT port thread, and -S magnet requirement. Although the 150mm stroke is relatively short for this bore, the robust 32mm rod and M27x2 rod thread handle high side loads well, though any long unsupported tooling should still utilize an external guide. Mounting is limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125X150-75S FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 75mm. This creates a usable travel window of 75-150mm from the 150mm nominal stroke, letting you fine-tune the retract end position without external stops.
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N. The maximum rated force is 1251 kgf at 1.0 MPa.
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