Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 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 SAIJ125X120-40
The AirTAC SAIJ125X120-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5MPa. It features a 125mm bore, a 120mm nominal stroke, and a PT-tapered G1/2 port. The integrated rear adjusting screw allows you to shorten the effective travel by up to 40mm, creating a precise 80-120mm usable stroke window without changing the cylinder itself.
This fine end-position tuning is ideal for machine setup and product changeovers, eliminating the need for external stops. The extruded aluminum barrel includes sensor grooves on both sides, though this configuration omits the magnet, meaning CMSE or DMSE electronic switches cannot be used without adding the -S option. The carbon steel rod and M27x2 thread provide robust durability for heavy loads, while the standard variable air cushions at both ends manage deceleration across the 30-500mm/s speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 |
|---|---|
| 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 SAIJ125X120-40
| 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 SAIJ125X120-40 Is Used
Product Changeover
Dial in the 80-120mm stroke window during format changes on packaging lines, avoiding the need to physically swap cylinders for different package sizes.
Heavy Clamping
Leverage the 6136N push force at 0.5MPa to securely clamp heavy workpieces, using the rear stopper to fine-tune the exact clamping depth.
Machine Setup
Precisely set the retract end-position at commissioning without bolting on external mechanical stops, streamlining the machine build process.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X120-40 the Right Cylinder?
Choose this 125mm bore cylinder when your application requires substantial thrust—such as the 6136N push force at 0.5MPa—combined with variable end-stop positioning. If you need less force, stepping down to a 100mm bore yields 3927N; if you need more, a 160mm bore provides 10053N. The SAIJ125X120-40 is selected over a fixed-stroke SAI specifically when commissioning requires dialing in the exact retract distance within its 80-120mm window.
Because the nominal stroke is 120mm, an external guide is not strictly required for side-load support, but the robust M27x2 thread helps manage torsional stress. Remember that the rear adjuster acts only as a travel stop, not a lock; the cylinder will not hold its load without live air. For load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder. When replacing an ISO 15552 unit, match the 125mm bore, 120mm stroke, 40mm adjustment, G1/2 port, and mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
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 SAIJ125X120-40 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw allows you to shorten the 120mm nominal stroke by up to 40mm, providing an adjustable travel window of 80-120mm. The adjuster acts as a travel stop and does not lock the load without live air pressure.
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