Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30
The AirTAC SAIJ40X155-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 155 mm travel by up to 30 mm. This creates a usable 125-155 mm end-position window, letting you fine-tune machine stops during commissioning without adding external physical stops or swapping the actuator. It delivers a 628 N push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
This model uses a PT tapered G1/4 port and includes variable air cushions at both ends to manage deceleration. The extruded aluminum barrel carries sensor grooves on both sides for flexible switch placement. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air pressure; for true pneumatic locking, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 155 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 SAIJ40BX155-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×155 | 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 SAIJ40BX155-30 Is Used
Machine Setup Calibration
Dial in the exact 125-155 mm retract position during initial commissioning to perfectly align tooling without machining custom spacer blocks.
Product Changeover
Quickly adapt the stroke stop for different package sizes on a packaging line, using the 30 mm adjustment window to handle size variations.
Assembly Station Indexing
Precisely set the end-of-stroke stop for an assembly press, ensuring components are seated correctly without over-traveling.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-30 the Right Cylinder?
Choose this 40 mm bore actuator when you need the 628 N push force at 0.5 MPa (or 879 N at 0.7 MPa) and require on-the-fly end-position adjustments. If your application requires less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa. The adjustable stroke is ideal for product changeovers on a packaging line where the exact stop position varies by a few millimeters. Unlike a fixed-stroke SAI cylinder, this SAIJ model lets you trim the retract end without mechanical modifications. When replacing an ISO 15552 cylinder, match the 40 mm bore, 155 mm stroke, 30 mm adjustment, PT G1/4 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
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 SAIJ40BX155-30 FAQ
It features a rear adjusting screw that physically limits the piston's retract travel. For this model, you can shorten the 155 mm nominal stroke by up to 30 mm, giving you an adjustable travel window of 125 to 155 mm to fine-tune the end position.
At a standard 0.5 MPa operating pressure, the SAIJ40X155-30 provides a push force of 628 N and a pull force of 528 N. At 0.7 MPa, the push force increases to 879 N.
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