Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100S
The AirTAC SAIJ125X400-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stopper, allowing you to dial back the nominal 400 mm stroke by up to 100 mm. This yields a usable travel window of 300 to 400 mm, providing exact end-position tuning during commissioning without physically swapping the barrel or adding external stops. It features a carbon steel piston rod and a PT tapered port thread.
Delivering a robust 6136 N push force at 0.5 MPa and up to 11045 N at 0.9 MPa, this 125 mm bore actuator handles heavy loads. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed and DMSE electronic switches, both fully supported by the integrated -S magnet. The SAIJ mounting set omits FB, CA, CB and CR options, utilizing Basic, FA, LB, TC, FTC, TCM1 and TCM2 interfaces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125X400-100S Is Used
Variable End Stops
Dial in the exact retract position within a 300 to 400 mm window for multi-format packaging lines without changing the cylinder.
Machine Changeover
Quickly reset the stroke limit during product family transitions on heavy-duty conveyors using the rear adjustment screw.
Heavy Pressing
Leverage 11045 N of force at 0.9 MPa for pressing operations while fine-tuning the final approach distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100S the Right Cylinder?
Select this 125 mm bore when your application requires higher thrust than the 80 mm class (2513 N at 0.5 MPa) but does not need the full 10053 N output of the 160 mm bore. The 100 mm adjustment range is ideal for machinery that undergoes frequent product size changeovers, allowing operators to set variable end stops on the fly. For holding loads without live air pressure, note that the rear adjuster is strictly a travel stop, not a lock; you must use a SAIL or BSAI cylinder, or an external pilot-operated check valve.
Because the 400 mm stroke is relatively long, the 32 mm rod diameter should not be relied upon to absorb high side loads; always guide the load externally to prevent rod binding and premature seal wear. To match this ISO 15552 replacement exactly, specify: 125 mm bore, 400 mm stroke, 100 mm adjustment, PT G1/2 ports, the required mounting subset, and the -S magnet for CMSE/DMSE sensor compatibility.
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 SAIJ125X400-100S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa the push force increases to 11045 N.
A rear stopper screw lets you mechanically shorten the 400 mm stroke by up to 100 mm, creating a usable travel window of 300 to 400 mm. The adjuster only sets the end position and does not hold the load without 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 SAIJ125X400-100S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.