Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40 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 SAIJ40BX210-40
The AirTAC SAIJ40X210-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a 0.7 MPa push force of 879 N and features a 16 mm carbon steel rod with an M12x1.25 thread. By turning the rear adjustment screw, you can trim the nominal 210 mm travel back by up to 40 mm, creating a precise 170-210 mm usable window. This built-in stopper allows you to dial in the exact retract end-position at commissioning without adding external physical stops.
This model features a SUS304 stainless steel rod (option B) for superior corrosion resistance in humid or washdown environments. Unlike a fixed-stroke SAI cylinder, the SAIJ variant lets you accommodate minor product size changes on the fly. The rear adjuster acts purely as a travel stop to decelerate the load alongside the standard air cushions; it does not lock or hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40 |
|---|---|
| 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 SAIJ40BX210-40
| 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 SAIJ40BX210-40 Is Used
Machine Changeover
Dial in the exact 170-210 mm retract position during product size changeovers without swapping the entire cylinder or adding external stops.
End-Position Tuning
Fine-tune the final resting position of tooling at commissioning using the built-in rear screw, ensuring precise alignment on the assembly line.
Corrosive Environments
Leverage the SUS304 stainless steel rod to reliably drive equipment in humid or washdown manufacturing areas without compromising the 879 N push force.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40 the Right Cylinder?
Choose this 40 mm bore when an application requires 879 N of push force at 0.7 MPa, which is a noticeable step up from the 32 mm bore's 563 N output, yet more compact than the 50 mm bore's 1374 N. The adjustable 170-210 mm travel window is ideal for machine setups requiring variable end-stops during product changeovers. When specifying an ISO 15552 replacement, match the 40 mm bore, 210 mm stroke, 40 mm adjustment range, PT tapered port threads, and the SUS304 rod material. Since this cylinder lacks a magnet, it will not work with CMSE or DMSE sensors; add an -S suffix if position feedback is needed. Additionally, the 210 mm stroke is well within standard limits, so no external side-load guide is required.
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 SAIJ40BX210-40 FAQ
At an operating pressure of 0.7 MPa, this 40 mm bore cylinder generates a push force of 879 N and a pull force of 528 N. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 210 mm stroke by up to 40 mm. This provides a usable travel window of 170-210 mm, allowing you to set the exact retract end-position without replacing the cylinder.
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