Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-50
The AirTAC SAIJ40X145-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 50 mm. This creates a usable 95-145 mm stroke window, enabling precise end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers a robust 879 N push force at 0.7 MPa, making it well-suited for moderate-load industrial tasks.
Built with a SUS304 stainless steel rod for superior corrosion resistance, this 40 mm bore unit uses PT tapered ports and includes adjustable air cushions at both ends to manage end-of-stroke impact. The extruded aluminum barrel features sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic sensors if a magnet is added later. It supports a 30-800 mm/s speed range and accepts a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAIJ40BX145-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SAIJ40BX145-50 Is Used
Machine Setup & Changeover
Quickly fine-tune the 95-145 mm travel window during product size changes without physically swapping the cylinder or bolting on external stoppers.
Variable End-Stop Positioning
Ideal for assembly stations needing precise retraction limits, using the rear adjuster to set exact end positions for varying component heights.
Corrosive Environment Handling
The SUS304 stainless steel rod withstands washdown and corrosive factory settings while delivering 879 N of push force at 0.7 MPa.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-50 the Right Cylinder?
Select this 40 mm bore model when your application requires 879 N of push force at 0.7 MPa and a highly flexible end-stop. The 50 mm adjustment range is ideal for product changeovers on a line, letting you dial in the exact 95 to 145 mm travel window on the fly. If you need less force, the 32 mm bore offers 563 N at 0.7 MPa; if your load is heavier, stepping up to the 50 mm bore provides 1374 N. Remember that the rear adjuster acts only as a travel stop and the air cushion provides deceleration—neither will hold a load without live air pressure. For true load-holding, consider the SAIL or BSAI series.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 145 mm nominal stroke, 50 mm adjustment code, PT port thread, and the specific mounting style. Because the stroke is 145 mm, the 16 mm rod and M12x1.25 thread handle standard loads well, but any application approaching the 1200 mm max standard stroke limit will require an external guide to prevent rod side-loading damage.
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 SAIJ40BX145-50 FAQ
The rear adjuster screw allows you to shorten the nominal 145 mm stroke by up to 50 mm, creating a usable travel window of 95 to 145 mm. This lets you set the exact end position during commissioning without changing the cylinder.
At an operating pressure of 0.7 MPa, the SAIJ40X145-50 provides 879 N of push force and 724 N of pull force. It can deliver up to 1130 N push force at 0.9 MPa.
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