Airtac SAIJ50 Adjustable Cylinder SAIJ50BX40-40
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX40-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 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 SAIJ50 Adjustable Cylinder SAIJ50BX40-40
The AirTAC SAIJ50X40-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel anywhere in a 0-40 mm window. This fine-tuning capability is ideal for machine changeovers, letting you dial in the exact end position without swapping hardware or adding external stops. It delivers a robust 982 N push force at 0.5 MPa, making it well-suited for moderate-duty positioning tasks.
This unit is configured with a SUS304 stainless steel piston rod (option B) for superior corrosion resistance in washdown or chemically active environments. It uses PT tapered port threads and lacks a standard magnet, meaning position sensing via CMSE or DMSE switches is not supported out of the box. The rear adjuster acts purely as a mechanical stop to set the travel endpoint, so it cannot hold a load if air pressure is removed.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX40-40 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX40-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50BX40-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | 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 SAIJ50 Adjustable Cylinder SAIJ50BX40-40 Is Used
Machine Changeover
Quickly reset the cylinder's end-stop from 0 to 40 mm when switching a packaging line to a different carton size, eliminating the need to physically swap cylinders.
Fixture Positioning
Fine-tune the clamping travel to exactly 35 mm to accommodate part tolerances during initial setup, ensuring consistent clamping without adding external spacers.
Short-Stroke Ejection
Use the 982 N push force at 0.5 MPa to eject parts from a machine bed, with the adjuster limiting the stroke to prevent the rod from hitting the conveyor guide.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX40-40 the Right Cylinder?
Choose this 50 mm bore when your application requires more force than a 40 mm bore provides (528 N pull at 0.5 MPa) but does not need the bulk of a 63 mm cylinder (1402 N pull). The adjustable stroke is highly advantageous over a fixed SAI cylinder when you need to compensate for mechanical tolerances during commissioning or frequently alter the end-stop for different product sizes. Because the stroke is only 40 mm, side-load stress is minimal, though the 20 mm rod diameter handles standard loads well.
For ISO 15552 replacement matching, specify a 50 mm bore, 40 mm stroke, 40 mm adjustment range, PT port threads, and no magnet. It supports the SAIJ mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Remember that the rear adjuster is a travel stop, not a locking device; for load-holding without live air pressure, consider the SAIL or BSAI series instead.
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 SAIJ50 Adjustable Cylinder SAIJ50BX40-40 FAQ
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 1374 N.
The rear adjuster screw lets you mechanically shorten the nominal 40 mm stroke down to 0 mm. This allows you to set the exact end-position at commissioning without changing the cylinder, but it functions only as a travel stop and does not lock the load without air pressure.
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