Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30S 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 SAIJ125X250-30S
The AirTAC SAIJ125X250-30-S is a double-acting ISO 15552 profile cylinder with a single rod and a rear stroke adjuster. It features a 125 mm bore generating 6136 N of push thrust and 5734 N of pull thrust at 0.5 MPa. A carbon steel rod and M27x2 rod thread provide robust load connectivity for heavy-duty operations. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated -S magnet enables position detection with AirTAC CMSE reed or DMSE solid-state switches.
Equipped with a 30 mm rear adjustment screw, this model allows you to fine-tune the effective travel window down from a 250 mm nominal stroke to a precise 220-250 mm range. This built-in adjuster acts purely as a mechanical end-stop to trim the retract position at commissioning without adding external stops. The cylinder operates at 30-500 mm/s with PT tapered G1/2 ports and variable air cushions at both ends.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30S |
|---|---|
| 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 SAIJ125X250-30S
| 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 SAIJ125X250-30S Is Used
Machine Setup & Changeover
Dial in the 220-250 mm travel window during product family changeovers to set new retract end-stops rapidly without replacing the cylinder.
Heavy Pressing Operations
Leverage the 6136 N push force at 0.5 MPa for heavy assembly or pressing tasks, using the 30 mm adjuster to fine-tune the final contact position.
Variable End-Stop Positioning
Adjust the rear mechanical stopper to trim the effective stroke on the fly, perfect for testing multiple end-of-stroke positions during machine commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30S the Right Cylinder?
Select this 125 mm bore adjustable cylinder when an application requires heavy forces between the 50 mm class (982 N push at 0.5 MPa) and the 160 mm class (10053 N push). The 30 mm adjustment range is ideal for product-size changeovers on a line, letting you dial in the exact retract end-position without physically swapping the cylinder or fabricating new external stopper blocks. It provides a true ISO 15552 mounting interface, ensuring dimensional interchangeability with other ISO 15552 cylinders.
When matching a replacement, verify the 125 mm bore, 250 mm stroke, 30 mm adjuster, PT G1/2 port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the nominal stroke is 250 mm, an external guide rail is recommended to prevent excessive rod side-loading. Remember that the rear adjuster is a travel stop, not a lock; for load-holding without live air pressure, specify an AirTAC 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 SAIJ125X250-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum thrust of 1251 kgf at 1.0 MPa.
The rear adjuster screw acts as a mechanical stop that allows you to shorten the 250 mm nominal stroke by up to 30 mm, creating a usable travel window of 220-250 mm. It is a travel stop, not a lock, meaning it cannot hold the load without continuous live air pressure.
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