Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 210mm 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.
- BoreØ40 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50
The AirTAC SAIJ40X210-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This yields a usable positioning window of 160 to 210 mm, letting you dial in the exact retract end-stop during commissioning without swapping out the barrel or adding external stops. Built with a SUS304 stainless steel rod and tapered PT ports, it provides a push force of 879 N at 0.7 MPa.
Because the rear adjuster functions strictly as a mechanical stop and not a lock, the cylinder cannot hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic sensors if you add a magnet later. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 210 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×210 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX210-50 Is Used
Product Changeovers
Quickly shift the retract end-stop by up to 50 mm to accommodate varying package sizes on a packaging line without replacing the cylinder.
Commissioning Calibration
Fine-tune the 160 to 210 mm travel window during machine setup to perfectly strike a part without relying on external spacers.
Adjustable Diverter
Set the exact push-off distance for items moving down a belt, allowing on-the-fly adjustments for different product widths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50 the Right Cylinder?
Choose this 40 mm bore when you need 879 N of push force at 0.7 MPa, which is a notable step up from the 32 mm bore's 563 N, yet more compact than the 50 mm bore's 1374 N. The 50 mm adjustment range is ideal for machines handling frequent product size changeovers, allowing operators to reposition the retract end-stop on the fly rather than machining new hard stops. When replacing an ISO 15552 cylinder, match the 40 mm bore, 210 mm stroke, PT port threads, and the chosen mounting hardware.
With a 210 mm stroke, the M12x1.25 rod is long enough that side-loading becomes a concern. Ensure proper alignment and use an external guide rail to prevent premature seal wear. If your application requires the piston to hold position without continuous air pressure, note that the SAIJ adjuster only sets the travel end and you must look to a SAIL pneumatic lock or external rod lock for fail-safe holding.
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 SAIJ40 Adjustable Cylinder SAIJ40BX210-50 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 210 mm nominal stroke by up to 50 mm. This creates a usable travel window of 160 to 210 mm, which is set mechanically at commissioning rather than via pneumatic pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.