Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30
The AirTAC SAIJ125X70-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a substantial 6136N push force at 0.5 MPa, utilizing a 32mm carbon steel rod and a PT G1/2 tapered port to handle high-flow pneumatic demands. An external adjusting screw allows you to shorten the effective travel from its 70mm nominal length down to a 40mm minimum, creating a precise 40-70mm usable window without changing the cylinder itself.
This built-in stopper is designed for fine-tuning the retract end-position during commissioning or product changeover, completely bypassing the need to bolt on external stops. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed and DMSE electronic switches, though this specific SKU omits the -S magnet. Remember that the rear adjuster acts strictly as a travel stop and deceleration point; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125X70-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SAIJ125X70-30 Is Used
Variable End-Stop Forming
Dial in the exact 40-70mm retract position for pressing or forming different material thicknesses without swapping out the entire cylinder.
Machine Changeover
Speed up product line changeovers by turning the rear screw to instantly match the new stroke requirements, eliminating external stop hardware.
Heavy-Duty Clamping
Leverage the 6136N push force to secure large workpieces, using the adjustable travel to compensate for varying part dimensions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X70-30 the Right Cylinder?
Select this 125mm bore when your application requires heavy thrust in the 6000N range but demands variable end-stops for rapid machine setup. If your force requirements are lower, stepping down to an 80mm bore yields 2513N at 0.5 MPa, whereas a 160mm bore provides 10053N for larger loads. The adjustable 40-70mm travel window is ideal for product-size changes on a line, offering flexibility that a fixed-stroke SAI cylinder cannot match.
Because the 70mm stroke is relatively short, side-load stress is minimal, but the 32mm rod and M27x2 thread provide excellent rigidity for offset loads. Mounting options include the reduced SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. For applications needing true position holding without live air, consider the SAIL lock or BSAI clamp-lock cylinders instead of relying on the adjuster.
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 SAIJ125X70-30 FAQ
The rear adjuster allows you to trim the 70mm nominal stroke back by up to 30mm. This provides a usable travel window of 40-70mm, letting you fine-tune the exact retract end-position at commissioning without adding external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure.
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