Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75S
The AirTAC SAIJ125X950-75-S is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical adjuster, enabling you to dial back the 950mm nominal stroke by up to 75mm. This yields a usable travel window of 875-950mm, letting you fine-tune the retract end-position during commissioning or product changeover without swapping the barrel or bolting on external stops. It delivers robust thrust, pushing 6136N and pulling 5734N at 0.5MPa, making it well-suited for heavy actuation tasks.
This SKU features a carbon steel piston rod and a PT tapered port thread. It includes a built-in magnet (-S) for position sensing, operating seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches mounted in the dual-side sensor grooves. The rear screw acts purely as a travel stop to set the end-position and relies on the internal air cushion for deceleration; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 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 SAIJ125X950-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | 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 SAIJ125X950-75S Is Used
Variable End-Stop Forming
Dial in the exact retract distance for multi-size metal forming operations, using the 875-950mm window to accommodate different blank lengths on the same press.
Machine Changeover
Rapidly adjust the end-of-stroke position during product family changeovers without disassembling the cylinder or adding spacer shims to the tooling.
Heavy Assembly Line Actuation
Leverage the 6136N push force at 0.5MPa to shift heavy pallets or fixtures, relying on the 125mm bore for high-thrust automated assembly tasks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-75S the Right Cylinder?
Choose this 125mm bore when your application requires significantly more force than an 80mm bore provides (which yields 2513N push at 0.5MPa), but without stepping up to the massive 160mm class. The adjustable stroke is ideal for machinery that processes varying product sizes, allowing operators to set variable end-stops on the fly. For load-holding requirements without continuous air pressure, this cylinder is not a lock; you should instead select an AirTAC SAIL (pneumatic lock) or BSAI (clamp-lock) cylinder.
Because the 950mm stroke is substantial, the 32mm diameter carbon steel rod and M27x2 rod thread will carry high side loads, but an external guide rail is still recommended to prevent rod binding over this long unsupported travel. As a dimensionally interchangeable ISO 15552 unit, it matches standard mounting footprints using the Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessory set, omitting FB, CA, CB, and CR options.
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 SAIJ125X950-75S FAQ
The rear adjuster acts as a mechanical stopper that lets you shorten the 950mm nominal stroke by up to 75mm, providing an 875-950mm usable travel window. It sets the end position and relies on the air cushion for deceleration, but it is not a lock and will not hold the load without live air pressure.
At a 0.5MPa operating pressure, the SAIJ125X950-75-S provides 6136N of push force and 5734N of pull force. It can achieve up to 11045N push force at 0.9MPa.
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