Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20
The AirTAC SAIJ40X275-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 255 to 275 mm, allowing you to dial back the nominal 275 mm stroke by up to 20 mm during commissioning. Equipped with a 16 mm SUS304 stainless steel rod and a PT tapered port, it delivers 879 N of push force at 0.7 MPa.
This adjustable-stroke design eliminates the need to swap out the entire cylinder or add external stops when fine-tuning the retract end position. The extruded aluminum barrel includes sensor grooves on both sides, and the SAIJ mounting set supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments. The rear adjuster functions strictly as a travel stop, not a lock, so it cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 275 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 SAIJ40BX275-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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 SAIJ40BX275-20 Is Used
End-Position Tuning
Dial in the exact retract distance within the 255-275 mm window during machine commissioning without adding external stops.
Product Changeover
Quickly adapt the end-stop for different product sizes on a conveyor line by turning the rear adjuster screw.
Assembly Calibration
Fine-tune the stroke on automated assembly equipment to ensure precise positioning of the 16 mm stainless steel rod.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-20 the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust, such as 628 N push at 0.5 MPa, but does not need the higher 982 N output of the 50 mm bore. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, whereas a fixed-stroke SAI cylinder is better for repetitive single-position tasks. Because the 275 mm stroke exceeds 300 mm is not the case here, but long unsupported strokes still benefit from an external guide to manage side-load on the M12x1.25 rod thread. For true load-holding without continuous air, select a SAIL or BSAI cylinder instead of relying on the adjuster. Replacement requires matching the 40 mm bore, 275 mm stroke, 20 mm adjustment, PT port, and the correct mounting hardware.
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 SAIJ40BX275-20 FAQ
At 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It operates at speeds of 30-800 mm/s.
The rear adjuster acts as a travel stop that lets you shorten the effective stroke from 275 mm down to 255 mm. It is not a locking mechanism, so live air is still required to hold the load.
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 SAIJ40BX275-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.