Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-20S 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
- 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 SAIJ125BX155-20S
The AirTAC SAIJ125X155-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 155 mm stroke that can be dialed back by up to 20 mm, yielding a precise 135-155 mm usable travel window for commissioning flexibility without external stops. In the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This variant features a SUS304 stainless steel rod (option B) for superior corrosion resistance and a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet (-S) directly supports AirTAC CMSE reed and DMSE electronic solid-state switches for exact end-position detection. The rear adjuster acts purely as a travel stop to fine-tune the end position and is not a locking mechanism.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-20S |
|---|---|
| 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 SAIJ125BX155-20S
| 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 SAIJ125BX155-20S Is Used
Product Changeover
Dial in the 135-155 mm travel window during line changeovers to accommodate different product lengths without physically swapping the cylinder.
Machine Setup
Fine-tune the exact end-stop position at commissioning using the rear screw, eliminating the need to bolt on external mechanical stops.
Heavy Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or tooling fixtures reliably within precision assembly cells.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX155-20S the Right Cylinder?
Selecting this 125 mm bore over a smaller 100 mm bore steps the thrust up from 3927 N to 6136 N at 0.5 MPa, while moving to a 160 mm bore would push that output to 10053 N. The adjustable stroke is chosen over a fixed SAI cylinder when a machine setup requires variable end-stops or fine-tuning during product changeovers. To match this ISO 15552 interchangeable cylinder, specify: 125 mm bore, 155 mm stroke, 20 mm adjustment, PT ports, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and the -S magnet.
Because the stroke is under 300 mm, side-load concerns are moderate, though the 32 mm rod and M27x2 thread handle higher bending loads well. Remember that the rear adjuster only sets the travel end and does not hold the load without live air; for true load-holding without pressure, use an external rod lock, a pilot-operated check valve, or an AirTAC SAIL or BSAI cylinder.
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 SAIJ125BX155-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the 155 mm nominal stroke by up to 20 mm, creating a 135-155 mm usable travel window. This stopper fine-tunes the end position during setup but does not lock the load without live air pressure.
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