Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30 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 SAIJ125X135-30
The AirTAC SAIJ125X135-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 135 mm nominal stroke by up to 30 mm. This yields a usable travel window of 105-135 mm, perfect for fine-tuning end positions during machine commissioning without swapping hardware. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This model features a 32 mm carbon steel rod with an M27x2 thread, paired with 40 mm variable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides; adding a -S magnet later enables tracking with AirTAC CMSE reed or DMSE electronic sensors. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30 |
|---|---|
| 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 SAIJ125X135-30
| 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 SAIJ125X135-30 Is Used
Product Changeovers
Dial in the 105-135 mm travel window on the fly when switching between product sizes on a packaging line, avoiding the need to physically swap cylinders.
End-Position Tuning
Fine-tune the retract stroke during machine commissioning to perfect a pressing or forming operation without adding external mechanical stops.
Heavy Material Handling
Leverage the 6136 N push force to move heavy pallets or fixtures, relying on the 40 mm cushions to absorb the impact at the end of travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-30 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (providing 3927 N push at 0.5 MPa) lacks the necessary power, but you want to avoid stepping up to a 160 mm unit that outputs 10053 N. The adjustable rear stopper is ideal for product-size changeovers on a line, offering variable end stops instead of machining fixed external stops. The operating speed range is 30-500 mm/s.
For an exact ISO 15552 replacement, match the 125 mm bore, 135 mm stroke, 30 mm adjustment, PT tapered port thread, and your required mounting bracket. Because the stroke is 135 mm, side-load stress is moderate, but always ensure external guiding for heavy loads. Remember that the rear adjuster is a travel stop, not a lock; if you need to hold a load without live air pressure, specify an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125X135-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At a maximum 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster acts as an external stopper that allows you to shorten the effective stroke from its 135 mm nominal length down to 105 mm. It sets the travel end and relies on the air cushion for deceleration, but it does not lock or hold the load without continuous air pressure.
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