Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 100mm 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
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-50S
The AirTAC SAIJ125X100-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, generating 6136N push and 5734N pull force at 0.5 MPa, peaking at 1251 kgf at 1.0 MPa. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic switches.
This specific SKU features a 100mm nominal stroke paired with a 50mm adjustment range, creating a highly versatile 50-100mm usable travel window. You can fine-tune the retract end-position at commissioning without swapping hardware. The extruded aluminum barrel includes sensor grooves on both sides, and it utilizes a robust 32mm carbon steel rod with an M27x2 thread to handle demanding loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAIJ125X100-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SAIJ125X100-50S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 50mm and 100mm during machine setup to accommodate different material thicknesses without external stopper blocks.
Heavy-Duty Forming
Leverage the 6136N push force at 0.5 MPa for pressing or clamping operations where the final end-position requires mechanical fine-tuning.
Product Size Changeover
Quickly reconfigure automated lines for new product dimensions by adjusting the rear stopper screw, reducing downtime between production runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X100-50S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder lacks thrust, as the 80mm yields 2513N push at 0.5 MPa compared to 6136N here. The adjustable stroke is ideal for product-size changeovers on a line, letting you dial in the exact 50-100mm end-stop mechanically rather than adding external stops. For a fixed travel setup, a standard SAI cylinder suffices. To replace this unit, match the 125mm bore, 100mm stroke, 50mm adjustment, PT tapered port thread, and -S magnet.
Because the stroke is 100mm, side-loading is minimal, but always ensure the M27x2 rod thread is properly aligned. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air; for true pneumatic locking without pressure, consider the AirTAC SAIL or BSAI series. Mounting options are restricted to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
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 SAIJ125X100-50S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At its maximum operating pressure of 1.0 MPa, it delivers a peak push force of 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to trim the effective travel. For this SAIJ125X100-50-S model, the 100mm nominal stroke can be reduced by up to 50mm, creating a usable travel window of 50-100mm. It is a travel stop, not a lock, and cannot hold the load without continuous air pressure.
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