Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100
The AirTAC SAIJ125X250-100 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a usable travel window of 150 to 250 mm, allowing you to dial back the 250 mm nominal stroke by up to 100 mm. This bore size delivers substantial thrust, pushing 6136 N and pulling 5734 N at a 0.5 MPa operating pressure.
It features a 32 mm carbon steel piston rod with an M27x2 thread, designed to handle high side-load stresses during heavy actuation. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches, though a magnet is not specified for this configuration. The rear adjuster acts purely as a mechanical stop to fine-tune the end position and must not be confused with a locking mechanism.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125X250-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125X250-100 Is Used
Product Changeover
Dial in the exact end position for new part sizes on a machining line by adjusting the rear stopper up to 100 mm without swapping hardware.
Machine Commissioning
Fine-tune the travel window to 150-250 mm during initial setup to perfectly time the stroke sequence with existing machine logic.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures, using the adjustable stop to prevent overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-100 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder's 2513 N push force at 0.5 MPa is insufficient for moving heavy jigs, but a 160 mm bore providing 10053 N would be excessive overkill. The 100 mm adjustment range is ideal for production lines running mixed product sizes, allowing operators to reposition the end stop during changeovers without physically swapping the cylinder or adding external shims.
Because the 250 mm stroke is under the 300 mm side-load threshold, external guide support is less critical than with longer strokes, though the heavy mass still warrants careful mounting. This SAIJ configuration uses a PT tapered port thread and supports the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting the FB, CA, CB, and CR brackets. Remember that the air cushion and rear stopper do not hold loads without live air pressure; for true load-holding, select an SAIL or BSAI series cylinder.
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 SAIJ125X250-100 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers 1251 kgf.
The rear adjuster screw lets you mechanically shorten the 250 mm nominal stroke down to 150 mm. This creates a 150-250 mm usable travel window for fine-tuning end positions at commissioning, but it functions only as a stop and does not lock the load without live air.
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