Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30 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 SAIJ125X400-30
The AirTAC SAIJ125X400-30 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a 400mm nominal stroke that can be fine-tuned down by up to 30mm, creating a precise 370-400mm usable travel window. This built-in adjustability allows operators to dial in exact end positions during commissioning without adding external stops.
This bore size utilizes a 32mm carbon steel rod with an M27x2 thread, paired with 40mm variable air cushions at both ends to manage heavy kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides for tracking position. Because this SKU lacks a magnet, adding position detection later requires ordering a -S variant to host CMSE reed or DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30 |
|---|---|
| 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 SAIJ125X400-30
| 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 SAIJ125X400-30 Is Used
Product Changeovers
Quickly shift the 370-400mm travel window when switching machinery between different product lengths without changing the cylinder.
End-Stop Tuning
Fine-tune the retract position during initial setup to achieve exact alignment of heavy 125mm bore tooling.
Heavy Assembly Lines
Leverage the 6136N push force to move substantial pallets or fixtures while dialing in the exact stopping point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-30 the Right Cylinder?
Choose this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5 MPa) cannot move the load, but a 160mm bore (10053N) would be physically oversized. The 30mm adjustment range is ideal for production lines running mixed product sizes, letting you shift the retract end-stop on the fly instead of physically swapping out a fixed-stroke SAI cylinder. With a 400mm stroke, the extended 32mm rod is highly susceptible to side-loading; always support the load with an external guide rail to prevent premature seal wear.
To match this ISO 15552 footprint, specify the 125mm bore, 400mm stroke, 30mm adjustment, PT tapered port thread, and your required mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster acts only as a travel stop and does not hold the load without live air—use a SAIL or BSAI cylinder if pilot-operated locking is required.
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 SAIJ125X400-30 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw acts as a mechanical stop that shortens the 400mm nominal stroke by up to 30mm, yielding a usable travel window of 370-400mm. It sets the end position but does not lock the load without continuous air pressure.
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