Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30S 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 SAIJ40BX210-30S
The AirTAC SAIJ40X210-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window between 180 and 210 mm without adding external stops. It delivers 879 N of push force at 0.7 MPa, making it well-suited for mid-range actuation tasks where exact end-position setting is critical during machine commissioning.
This variant includes a SUS304 stainless steel rod for corrosion resistance and a built-in magnet compatible with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel provides dual-side sensor grooves, and the unit omits FB, CA, CB, and CR mounts, utilizing a focused set of ISO 15552 interfaces: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30S |
|---|---|
| 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 SAIJ40BX210-30S
| 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 SAIJ40BX210-30S Is Used
Machine Changeover
Dial in the exact 180 to 210 mm retract position when switching between product sizes on a packaging line, using the rear stopper for rapid mechanical adjustment.
End-Position Tuning
Eliminate mechanical tolerance stack-up at commissioning by trimming up to 30 mm off the nominal stroke directly at the cylinder, rather than shimming external stops.
Sensor-Ready Actuation
Leverage the built-in magnet and dual-side barrel grooves to mount DMSE solid-state sensors for precise positioning feedback in automated assembly cells.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-30S the Right Cylinder?
Choose this 40 mm bore when you need precise retract-end tuning at setup or during product changeovers, avoiding the hassle of swapping a fixed-stroke SAI cylinder. If your application requires less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa; if you need more clamping power, a 50 mm bore provides 1374 N. The PT tapered port threads ensure a tight, mechanical seal on this model.
Because the stroke is 210 mm, you should verify guiding on longer travels to prevent side-loading damage to the M12x1.25 rod thread. Remember that the rear adjuster acts only as a travel stop for deceleration alongside the air cushions—it does not hold the load without live air. For true fail-safe load holding, consider an SAIL or BSAI cylinder instead.
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 SAIJ40BX210-30S FAQ
At an operating pressure of 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 30 mm from the 210 mm nominal length, creating a usable travel window of 180 to 210 mm. It sets the end position but does not lock the load without continuous air pressure.
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