Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20S
The AirTAC SAIJ40X425-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from a 425 mm nominal stroke to a 405 mm minimum. This creates a highly usable 405-425 mm adjustable window, letting you dial in exact end positions during commissioning without relying on 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 model includes a magnet for position sensing. The extruded aluminum barrel features sensor grooves on both sides to accept AirTAC CMSE reed and DMSE electronic solid-state switches. It utilizes PT tapered ports and offers adjustable air cushions at both ends to manage deceleration, though the rear adjuster acts strictly as a travel stop rather than a load-holding lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 425 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 SAIJ40BX425-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×425 | 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 SAIJ40BX425-20S Is Used
Product Changeover
Dial in the 405-425 mm travel window during line changeovers to accommodate different product lengths without swapping the entire cylinder.
Commissioning Tuning
Use the rear stroke stopper to fine-tune the exact end-of-stroke position during initial machine setup, eliminating the need for external shims.
Variable End Stops
Adjust the retract position on the fly for conveyor diverters or gating mechanisms that require precise, repeatable endpoint control.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-20S the Right Cylinder?
Select this 40 mm bore when you need more thrust than the 32 mm variant (which provides 563 N push at 0.7 MPa) but want to avoid the larger footprint of a 50 mm cylinder. An adjustable stroke is ideal for machine setups requiring variable end-stops or frequent product changeovers, providing setup flexibility that a fixed-stroke SAI cylinder cannot match. To replace an ISO 15552 cylinder, match the 40 mm bore, 425 mm stroke, PT port, and -S magnet.
Because the 425 mm stroke is relatively long, the 16 mm rod requires external guidance to prevent excessive side-loading and premature seal wear. Remember that the rear adjuster and air cushions only manage travel endpoints; this cylinder will not hold a load without live air pressure, so consider a SAIL or BSAI model if true locking is required.
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 SAIJ40BX425-20S FAQ
The rear adjuster acts as a mechanical stop that shortens the effective travel. For this model, you can trim the nominal 425 mm stroke back by up to 20 mm, creating an adjustable travel window between 405 and 425 mm.
At a 0.7 MPa operating pressure, the SAIJ40X425-20-S provides a push force of 879 N and a pull force of 528 N. It can deliver up to 1130 N push force at 0.9 MPa.
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