Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 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 SAIJ125BX40-20
The AirTAC SAIJ125X40-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 20 to 40 mm by trimming the nominal 40 mm stroke up to 20 mm via the external stopper screw. This allows precise end-position tuning during commissioning without swapping the cylinder or adding external stops. The 125 mm bore delivers 8590 N push force at 0.7 MPa, making it ideal for heavy-duty positioning.
This variant uses a SUS304 stainless steel rod (option B) for superior corrosion resistance and includes PT tapered port threads. It operates at speeds of 30-500 mm/s and features variable air cushions at both ends to decelerate the load. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE electronic switches if a magnet is specified later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125BX40-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125BX40-20 Is Used
Press Stroke Calibration
Dial in the exact 20-40 mm travel window during machine commissioning to accommodate varying material thicknesses without changing hardware.
Heavy Product Changeover
Quickly adjust the rear stopper on the production line to handle different product sizes, leveraging the 8590 N push force for robust actuation.
Corrosive Environment Actuation
Utilize the SUS304 stainless steel rod for reliable performance in washdown or corrosive manufacturing settings where carbon steel would fail.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX40-20 the Right Cylinder?
Select this 125 mm bore when an application requires high thrust that smaller bores cannot provide; stepping down to a 100 mm bore reduces the push force to 5497 N at 0.7 MPa. The adjustable stroke is perfect for machine setups requiring variable end stops or product-size changeovers. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI cylinder series.
To match this ISO 15552 replacement exactly, verify the 125 mm bore, 40 mm nominal stroke, 20 mm adjustment range, PT port threads, SUS304 (B) rod material, and no magnet. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR foot and pivot brackets. Since the 40 mm stroke is short, side-load risks are minimal, but always ensure rigid mounting to handle the 6136 N pull force at 0.5 MPa.
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 SAIJ125BX40-20 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 8056 N of pull force. It can deliver a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that trims the effective travel. For the SAIJ125X40-20, you can shorten the 40 mm nominal stroke by up to 20 mm, creating a usable 20 to 40 mm travel window. It is a travel stop, not a lock, and does not hold the load without air pressure.
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