Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30 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 SAIJ125X250-30
The AirTAC SAIJ125X250-30 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 220-250mm usable travel window, allowing you to trim the effective stroke by up to 30mm. This built-in adjustability enables precise end-position tuning at commissioning without swapping out the entire cylinder.
The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. It uses a PT tapered port thread and a robust 32mm carbon steel rod with an M27x2 thread to handle high side loads. The rear stopper screw sets the retract end position, but it acts strictly as a travel stop, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30 |
|---|---|
| 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 SAIJ125X250-30
| 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 SAIJ125X250-30 Is Used
Machine Changeover
Dial in the 220-250mm travel window during product size changes without adding external mechanical stops to the fixture.
End-Position Tuning
Fine-tune the retract stroke by up to 30mm during commissioning to perfectly time the machine sequence.
Heavy Forming Press
Leverage 6136N of push force at 0.5MPa for high-thrust operations while trimming the stroke to protect tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when your application requires 6136N push force at 0.5MPa and variable end-stops. If you need less force, stepping down to a 100mm bore yields 3927N push force. If your machine requires true position holding without live air pressure, a plain SAIJ is insufficient; you should look at the SAIL or BSAI locking cylinder series instead.
When replacing an ISO 15552 cylinder, match the 125mm bore, 250mm nominal stroke, 30mm adjustment range, PT port thread, and mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since the 250mm stroke is below the 300mm side-load threshold, standard mounting is generally sufficient, though external guides are recommended for heavy lateral loads.
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 SAIJ125X250-30 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 250mm nominal stroke by up to 30mm, creating a 220-250mm usable travel window. This stopper sets the end position but does not hold the load without continuous air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-30
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.