Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50S
The AirTAC SAIJ125X120-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers robust performance with a 125 mm bore, providing 6136 N of push force at 0.5 MPa. The -50 adjustment code allows you to trim the 120 mm nominal stroke back by up to 50 mm, creating a precise 70 to 120 mm usable travel window for exact end-position tuning during commissioning.
This model includes a SUS420J2 stainless steel rod for superior corrosion resistance and an integrated magnet (-S) compatible with AirTAC CMSE reed and DMSE electronic sensors. It uses PT tapered ports sized at G1/2 and achieves a standard speed range of 30-500 mm/s. The mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 configurations, omitting FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-50S Is Used
Product Changeover
Dial in the 70-120 mm stroke window on the fly when switching between product sizes on a packaging line, bypassing mechanical cylinder swaps.
End-Position Tuning
Fine-tune the retract end-point at machine commissioning without adding external physical stops or shims to the fixture.
Heavy Clamping
Leverage the 6136 N push force to securely hold heavy workpieces, using the adjustable stop to set the exact clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-50S the Right Cylinder?
Choose this 125 mm bore adjustable cylinder when an application requires heavy force (6136 N at 0.5 MPa) alongside variable end-stops, avoiding the need to swap physical cylinders during product changeovers. If your setup demands less force, stepping down to an 80 mm bore yields 2513 N, whereas moving up to a 160 mm bore provides 10053 N. The rear adjuster screw acts purely as a mechanical stop to fine-tune the retract position; it does not lock or hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 120 mm stroke, 50 mm adjustment range, PT G1/2 port, and the -S magnet. Because the stroke is 120 mm, side-load is minimal, but always ensure proper mounting alignment to maximize the seal and cushion lifespan.
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 SAIJ125AX120-50S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N. The operating speed range is 30-500 mm/s.
The rear adjusting screw allows you to mechanically shorten the 120 mm nominal stroke by up to 50 mm, providing a usable travel window of 70 to 120 mm. This stopper fine-tunes the end position but does not hold the load without live air pressure.
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