Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40S
The AirTAC SAIJ125X135-40-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, delivering 8590 N of push force at 0.7 MPa. By turning the rear stopper screw, you can fine-tune the effective travel down from the 135 mm nominal stroke, creating a 95-135 mm usable window. This on-machine tuning allows you to dial in exact end positions during commissioning or product changeovers without swapping out the entire actuator.
This model features a SUS420J2 stainless steel piston rod (material code A) for enhanced durability against moisture, paired with a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides, and because this is an -S variant, it accepts AirTAC CMSE reed and DMSE solid-state switches for precise position feedback. The SAIJ mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125AX135-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125AX135-40S Is Used
Product Changeover
Quickly dial in the 95-135 mm stroke window when switching a packaging line to a different carton size, using the rear adjuster instead of re-shimming the actuator.
Press End-Tuning
Fine-tune the retraction end-position during machine commissioning to hit a precise 120 mm stop, ensuring accurate pressing depth without adding external mechanical stops.
Variable Stops
Set up multiple retraction endpoints on an automated assembly station, taking advantage of the 40 mm adjustment range to handle different sub-assembly heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 3518 N at 0.5 MPa) cannot move your load, but you want to avoid stepping up to a 160 mm body (14074 N at 0.5 MPa) to save space. The adjustable stroke is ideal for machinery that requires variable end-stops for different sized parts, unlike a fixed-stroke SAI cylinder. Remember that the rear adjuster is a travel stop, not a lock; if the machine loses air pressure, the load will not hold. For true fail-safe load holding without live air, specify an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX135-40S FAQ
At a 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 8590 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear stopper screw lets you shorten the 135 mm nominal stroke by up to 40 mm, creating a 95-135 mm usable travel window. The adjuster acts as a mechanical stop to set the end position, but it does not lock the load if air pressure is lost.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.