Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-50S 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 SAIJ40BX155-50S
The AirTAC SAIJ40X155-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, utilizing a PT G1/4 port and a 16mm piston rod. Because this specific SKU includes a 50mm adjustment range, you can dial the effective travel back to anywhere within a 105-155mm window during commissioning without swapping out the physical cylinder.
This model features a SUS304 stainless steel rod (option B) for superior corrosion resistance and carries the -S magnet option for seamless integration with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting hardware supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-50S |
|---|---|
| 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 SAIJ40BX155-50S
| 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 SAIJ40BX155-50S Is Used
Product Changeovers
Quickly adapt the cylinder's end-stop from 155mm down to 105mm on packaging lines when switching to a different carton or product size.
Machine Setup
Fine-tune the retraction end position during initial commissioning to dial in exact clamping or pressing depths without mechanical rework.
Variable End Stops
Provide a customizable physical stop for diverter gates or pushing mechanisms where the required travel distance varies between production runs.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-50S the Right Cylinder?
Select this 40mm bore when an application requires precise end-position tuning on the fly; the rear stopper screw allows you to shorten the stroke by up to 50mm, which is far more efficient than machining external stops or buying a new cylinder for every product size change. If your setup needs less force, stepping down to a 32mm bore yields 402N at 0.5 MPa, while moving up to a 50mm bore provides 982N for heavier loads. Keep in mind the rear adjuster acts only as a travel stop and does not hold the load without live air—if you need true load-holding without pressure, consider an AirTAC SAIL or BSAI series cylinder. To match this exact ISO 15552 replacement, specify: 40mm bore, 155mm stroke, 50mm adjustment, PT G1/4 port, SUS304 rod, and the -S magnet.
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 SAIJ40BX155-50S FAQ
At a standard operating pressure of 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At its maximum pressure of 1.0 MPa, it can deliver up to 1130N of push force.
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 155mm stroke by up to 50mm, providing an effective usable travel window of 105-155mm. Note that this adjuster only sets the end position; it does not lock or hold the load without continuous air pressure.
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