Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40
The AirTAC SAIJ40X75-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 35 to 75 mm, allowing you to dial back the 75 mm nominal stroke by up to 40 mm during commissioning without swapping out the unit. In the 40 mm bore class, it delivers 628 N of push thrust and 528 N of pull thrust at 0.5 MPa operating pressure.
This model incorporates a SUS304 stainless steel rod (option B) for superior corrosion resistance in harsh environments. It uses PT tapered port threads (G1/4) and relies on a 30 mm variable air cushion at both ends to decelerate the piston. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE solid-state switches if a magnet is specified later.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAIJ40BX75-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SAIJ40BX75-40 Is Used
Machine Changeover
Quickly fine-tune the retract end position within the 35-75 mm window when switching product sizes on a packaging line.
Press Fit Tuning
Dial in the exact 40 mm stroke reduction needed for delicate pressing operations without adding external stopper blocks.
Assembly Station Setup
Establish precise end-stops for automated assembly tools during initial commissioning or fixture retooling.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-40 the Right Cylinder?
Choose this 40 mm bore adjustable cylinder when you need precise end-position tuning for product changeovers, avoiding the need to bolt on external physical stops. If your application requires less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa; conversely, stepping up to a 50 mm bore provides 982 N. Because the 75 mm stroke is relatively short, side-loading risks are minimal, but an external guide is recommended for any unsupported loads.
The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider an AirTAC SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external pilot-operated check valve. To match this ISO 15552 dimensionally interchangeable cylinder, specify the 40 mm bore, 75 mm stroke, 40 mm adjustment, PT G1/4 port, and the SUS304 (B) rod material.
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 SAIJ40BX75-40 FAQ
The 40 mm bore provides 628 N of push force and 528 N of pull force at 0.5 MPa. It operates at speeds between 30 and 800 mm/s.
A rear screw stopper lets you shorten the 75 mm nominal stroke by up to 40 mm, creating a 35-75 mm usable travel window. The adjuster sets the end position but does not lock the load without live air.
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