Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40 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 SAIJ125X250-40
The AirTAC SAIJ125X250-40 is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, allowing the effective travel to be dialed back by up to 40 mm. This creates a usable 210-250 mm stroke window for precise end-position tuning at commissioning without swapping the unit. In the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE and DMSE switches, though this specific configuration omits the internal magnet. It features a 32 mm carbon steel rod with an M27x2 thread, paired with 40 mm variable air cushions at both ends. The rear adjuster acts purely as a mechanical stop to set the retract position and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40 |
|---|---|
| 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 SAIJ125X250-40
| 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 SAIJ125X250-40 Is Used
Product Size Changeovers
Quickly dial in the 210-250 mm retract window during packaging line format changes to accommodate different carton lengths without changing hardware.
Machine Setup Tuning
Fine-tune the end-of-stroke position during initial commissioning to dial out mechanical interference and set exact clamping distances.
Heavy Material Pushing
Leverage the 6136 N push force at 0.5 MPa to shift heavy workpieces or index sturdy conveyors, using the rear stop to set precise indexing limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) lacks the thrust for moving heavy pallets, but a 160 mm bore (10053 N push) would be physically oversized. The integrated 40 mm adjuster is ideal for product-size changeovers on a line, letting operators fine-tune the retract distance rather than machining external stop collars. For true load-holding without continuous air, step up to the SAIL or BSAI series, as the SAIJ adjuster is not a lock.
To replace an ISO 15552 cylinder, match the 125 mm bore, 250 mm stroke, 40 mm adjustment, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 250 mm stroke is below the 300 mm threshold, side-load risks are moderate, but the robust 32 mm rod helps manage deflection better than smaller bores.
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 SAIJ125X250-40 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If operated at 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you mechanically shorten the nominal 250 mm stroke by up to 40 mm, creating a 210-250 mm usable travel window. It acts as a physical stop for end-position tuning and is not a locking device.
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 SAIJ125X250-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.