Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-100S
The AirTAC SAIJ125X375-100-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 275 to 375 mm, letting you dial back the nominal 375 mm stroke by up to 100 mm during commissioning.
This bore uses a PT tapered G1/2 port and a 32mm carbon steel rod. The integrated magnet works with CMSE reed and DMSE electronic sensors fitted into the dual-side barrel grooves. The rear screw acts purely as a travel stop for end-position tuning, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125X375-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125X375-100S Is Used
Variable End-Stop Tuning
Dial in the exact end position within the 275-375 mm window during machine setup without replacing the cylinder or adding external mechanical stops.
Product Size Changeover
Quickly adjust the travel distance on automated lines when processing different product sizes, leveraging the 100mm trim range for fast format changes.
Long-Stroke Positioning
Move heavy loads over a 375 mm nominal distance with 6136N of thrust, using the rear screw to fine-tune the final resting position to precise tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-100S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5 MPa) lacks the necessary thrust, but a 160mm bore (10053N) would be overkill. The 100mm adjustment range is perfect for product changeovers on a line, allowing variable end-stops without swapping the cylinder or bolting on external stops. Because the 375mm stroke is relatively long, an external guide rail is recommended to handle side-loading and prevent rod wear.
For load-holding without live air pressure, this cylinder is insufficient because the adjuster and air cushions only decelerate travel. You would need an external rod lock or a related type like the BSAI clamp-lock or SAIL air-released lock. This SAIJ model uses the reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
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 SAIJ125X375-100S FAQ
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective stroke by up to 100 mm. This creates a usable travel window of 275 to 375 mm, allowing you to fine-tune the retract end position without swapping the cylinder.
At an operating pressure of 0.5 MPa, it provides 6136N of push force and 5734N of pull force. The maximum operating pressure is 1.0 MPa, where the push force reaches 1251 kgf.
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Standard models usually ship in 3-4 days.
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