Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-30S
The AirTAC SAIJ125X750-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to fine-tune the retract end position during commissioning. With a 750 mm nominal stroke and a 30 mm adjustment screw, it provides a usable travel window of 720 to 750 mm without requiring external stops or hardware swaps. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This model features a standard carbon steel rod and a -S magnet that integrates directly with AirTAC CMSE reed and DMSE electronic solid-state sensors via the dual-side barrel grooves. The PT tapered port threads ensure a high-pressure pneumatic seal. Because the stroke reaches 750 mm on a 32 mm diameter rod, an external guide rail is strongly recommended to prevent excessive side-loading and premature seal wear.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 750 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 SAIJ125X750-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×750 | 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 SAIJ125X750-30S Is Used
Product Size Changeovers
Dial in the 720-750 mm travel window during packaging line format changes to accommodate varying carton lengths without replacing hardware.
Machine Setup Fine-Tuning
Use the 30 mm rear stopper to precisely set the retract end position during initial commissioning, avoiding the need to bolt on external physical stops.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or tooling fixtures, relying on the 40 mm cushioning to soften the impact at both ends.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X750-30S the Right Cylinder?
Selecting this adjustable-stroke cylinder over a fixed-stroke SAI model is ideal for production lines that require variable end-stops or frequent product-size changeovers, as the 30 mm rear screw allows precise end-position tuning without swapping the cylinder. If your application requires less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa; if you need more holding power, a 160 mm bore provides 10053 N. When replacing an ISO 15552 cylinder, match the 125 mm bore, 750 mm stroke, 30 mm adjustment range, G3/8 PT port, and the -S magnet option. The mounting footprint supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessories.
Remember that the rear adjuster functions strictly as a travel stop and cannot hold a load without live air pressure. The built-in variable air cushions only decelerate the piston; they do not act as a mechanical brake. For applications that require true fail-safe load holding without continuous air supply, consider the AirTAC SAIL pneumatic lock or BSAI clamp-lock series instead.
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 SAIJ125X750-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum rated pressure of 1.0 MPa, it can deliver up to 1251 kgf of push force.
The rear adjuster screw allows you to shorten the effective stroke by up to 30 mm, creating a usable travel window of 720 to 750 mm. This stopper sets the end position but does not lock the load without live air pressure.
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