Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20S
The AirTAC SAIJ125X350-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125 mm bore and a 350 mm nominal stroke that can be fine-tuned down by up to 20 mm, yielding a usable travel window of 330-350 mm. This built-in adjustability allows you to dial in exact end positions at commissioning without adding external stops. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, scaling up to 8590 N push at 0.7 MPa.
This variant includes a magnet for position sensing and is compatible with AirTAC CMSE reed and DMSE electronic sensors. It uses a PT tapered G1/2 port and a carbon steel rod with an M27x2 thread. The extruded aluminum barrel includes sensor grooves on both sides. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster acts as a travel stop for end-position tuning, not a load-holding lock; for fail-safe load holding without live air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125X350-20S Is Used
Product Size Changeover
Dial the rear stopper back by 20 mm instantly when a production line switches to a shorter variant of a product, avoiding cylinder swaps or mechanical shimming.
Press Fit Tuning
Fine-tune the 330-350 mm travel window during machine commissioning to set precise pressing depths for large bearings without reprogramming the motion controller.
Heavy Material Handling
Push heavy pallets or fixtures using 6136 N of thrust at 0.5 MPa, relying on the adjustable end-stop to accommodate varying pallet widths on the conveyor.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-20S the Right Cylinder?
Choose this 125 mm bore when your application requires over 6000 N of thrust at 0.5 MPa but does not necessitate stepping up to the 160 mm bore, which provides 10053 N at the same pressure. The adjustable 330-350 mm travel window is ideal for product changeovers on a line where exact end-of-stroke positions vary slightly between parts, saving you from swapping out a fixed-stroke SAI cylinder. Because the total stroke is 350 mm, the M27x2 carbon steel rod will experience leverage forces under side loads; for optimal seal life and guide bearing longevity, always pair this long stroke with an external linear guide to prevent rod bending.
To replace an ISO 15552 cylinder of the same footprint, match the 125 mm bore, 350 mm stroke, PT G1/2 port, and the desired mounting bracket from the SAIJ subset. Select the -S magnet option if you need to trigger CMSE or DMSE switches. Remember that the rear adjuster and the variable air cushions at both ends only manage deceleration and end-position tuning; they do not hold the load pneumatically without continuous air pressure.
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 SAIJ125X350-20S FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 20 mm. This creates a usable stroke window of 330 to 350 mm, letting you set the exact retract end-position at commissioning without changing the cylinder or adding external mechanical stops.
At an operating pressure of 0.5 MPa, this double-acting cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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 SAIJ125X350-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.