Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20S
The AirTAC SAIJ125X155-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 135-155 mm usable travel window, allowing you to dial back the 155 mm nominal stroke by up to 20 mm during commissioning. This bore delivers 6136 N pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This unit includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and uses PT tapered ports. The extruded aluminum barrel features sensor grooves on both sides, and the -S magnet enables position detection with AirTAC CMSE reed or DMSE solid-state switches. The rear adjuster acts purely as a travel stop, not a lock, so live air is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125AX155-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125AX155-20S Is Used
Press Tonnage Calibration
Fine-tune the 135-155 mm travel window during machine setup to perfectly position heavy 6136 N press fixtures without external spacers.
Heavy Product Changeover
Rapidly adjust the retract end-stop on a packaging line when switching between different large product sizes, saving setup time.
Actuator End-Position Tuning
Dial in the exact end position during commissioning using the rear screw, avoiding the need to swap out the entire ISO 15552 cylinder.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20S the Right Cylinder?
Select this 125 mm bore when 80 mm (2268 N pull at 0.5 MPa) is too weak but 160 mm is oversized. The adjustable stroke is ideal for product changeovers where exact end-of-travel tuning is needed without adding external stops. For load-holding without air pressure, choose a SAIL or BSAI cylinder instead, as the SAIJ adjuster is a stop, not a brake.
When specifying a replacement, match the 125 mm bore, 155 mm nominal stroke, 20 mm adjuster, PT port thread, and -S magnet. With a 155 mm stroke, side-load is moderate, but always guide the load to prevent rod binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX155-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N pull force and 8590 N push force at 0.7 MPa. It operates at speeds between 30-500 mm/s.
The rear adjuster screw lets you shorten the 155 mm nominal stroke by up to 20 mm, creating a 135-155 mm usable travel window. It acts as a mechanical stop and does not lock the load without live air.
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