Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50S
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X135-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50S
The AirTAC SAIJ125X135-50-S is a double-acting ISO 15552 profile cylinder with a rear stroke adjuster, engineered to fine-tune the retract end-position during commissioning. It provides a usable travel window of 85-135 mm, allowing you to dial back the 135 mm nominal stroke by up to 50 mm without swapping the cylinder or adding external stops.
This variant features a standard carbon steel rod and a built-in magnet (-S) for position sensing with AirTAC CMSE reed or DMSE electronic solid-state switches. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It uses a PT tapered G1/2 port and supports a speed range of 30-500 mm/s, while the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125X135-50S Is Used
Product Changeover
Dial in the exact end-stop position for different product sizes on a packaging line using the 50 mm adjustment range, avoiding physical hardware swaps.
Machine Setup
Simplify initial commissioning by trimming the 135 mm stroke back to the exact required travel distance, ensuring perfect mechanical alignment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50S the Right Cylinder?
Select this 125 mm bore when your application requires high thrust forces up to 6136 N at 0.5 MPa, but still needs the flexibility of a variable end-stop for product changeovers. The 50 mm adjustment window is ideal for adapting to varying part sizes on a single line.
Because the stroke is 135 mm, an external guide is recommended to manage side loads, despite the robust 32 mm rod diameter and M27x2 thread. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. For applications requiring true load-holding without continuous air pressure, consider the SAIL or BSAI series, as the SAIJ rear adjuster is not a lock.
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 SAIJ125X135-50S FAQ
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke by up to 50 mm. For this SAIJ125X135-50-S model, this creates a usable travel window of 85 to 135 mm. The adjuster only sets the travel end and does not lock or hold the load without live air pressure.
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