Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30S
The AirTAC SAIJ40X280-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel. With a 280 mm nominal stroke and a 30 mm adjustment range, you get a usable travel window of 250-280 mm to dial in exact end positions at commissioning. This 40 mm bore model delivers 879 N of push force at 0.7 MPa and uses a G1/4 port.
Built with a SUS304 stainless steel rod (code B) for corrosion resistance, it includes a magnet (-S) for position sensing with AirTAC CMSE reed or DMSE electronic switches. The extruded aluminum barrel provides sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 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 SAIJ40BX280-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 SAIJ40BX280-30S Is Used
Variable End-Stop Tuning
Dial the rear adjuster back by up to 30 mm to perfectly set the 250-280 mm travel window during machine commissioning without adding external stops.
Product Size Changeover
Quickly adapt the cylinder stroke on packaging lines when switching between different product lengths, saving time on physical reconfiguration.
Corrosion-Resistant Actuation
Ideal for manufacturing environments requiring consistent positioning, utilizing the SUS304 stainless steel rod and CMSE/DMSE sensor compatibility.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-30S the Right Cylinder?
Choose this 40 mm bore when you need precise variable end-stops during machine setup or product changeover, stepping up from a 32 mm bore (402 N push at 0.5 MPa) for higher force. The rear adjuster acts purely as a mechanical stop to decelerate travel; it does not hold the load without live air. For load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder.
For ISO 15552 replacement matching, specify the 40 mm bore, 280 mm stroke, 30 mm adjustment, PT tapered port, and the -S magnet. Because the stroke is 280 mm, the 16 mm rod and M12x1.25 thread carry side loads well, but long unsupported travel still requires an external guide to prevent binding.
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 SAIJ40BX280-30S FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It operates efficiently at speeds between 30 and 800 mm/s.
The rear adjuster screw lets you shorten the 280 mm nominal stroke by up to 30 mm, creating a usable travel window of 250-280 mm. This stop fine-tunes the retract end position but does not lock the load without live air pressure.
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