Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 65mm 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
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20S
The AirTAC SAIJ40X65-20-S 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 20 mm, creating a precise 45-65 mm usable window for commissioning without external stops. Built with a SUS304 stainless steel rod, it provides excellent corrosion resistance for demanding environments. Delivering 879 N of push force at 0.7 MPa, it uses a G1/4 port and PT tapered threads for a secure pneumatic connection.
This model includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state sensors housed in the dual-side extruded barrel grooves. The rear adjuster functions strictly as a travel stop for end-position tuning and relies on the variable air cushions for deceleration; it does not lock or hold the load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 65 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 SAIJ40BX65-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 SAIJ40BX65-20S Is Used
Changeover Calibration
Fine-tune the 45-65 mm travel window during product size changeovers to perfectly position parts without swapping out the entire cylinder assembly.
End-Stop Trimming
Dial in the exact retract position during machine commissioning, using the rear adjuster to compensate for mechanical tolerances on the fly.
Corrosive Positioning
Leverage the SUS304 stainless steel rod for precise pushing tasks in washdown or mildly corrosive environments where standard carbon rods fail.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX65-20S the Right Cylinder?
Choose this 40 mm bore when you need more thrust than the 32 mm version (563 N push at 0.7 MPa) but want a more compact footprint than the 50 mm option (1374 N push at 0.7 MPa). The adjustable stroke is ideal for machine setups requiring variable end-stops or frequent product changeovers, whereas a fixed SAI cylinder is better for static, unchanging strokes. For load-holding without live air, select a SAIL or BSAI cylinder instead.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 65 mm nominal stroke, 20 mm adjustment range, G1/4 port with PT threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. The 16 mm rod and M12x1.25 thread handle side loads well, though external guides are recommended for any unsupported loads.
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 SAIJ40BX65-20S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 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 acts as a mechanical stop that lets you shorten the 65 mm nominal stroke by up to 20 mm, providing a usable travel range of 45 to 65 mm. It only sets the end position and does not hold the load without live air.
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