Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20S
The AirTAC SAIJ40X500-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position. With a 500 mm nominal stroke and a 20 mm adjustment range, it provides a usable travel window of 480-500 mm. It delivers 628 N of pull force at 0.5 MPa and utilizes a PT tapered G1/4 port. This configuration includes a SUS304 stainless steel rod and an integrated magnet for CMSE reed and DMSE electronic sensors.
The rear adjuster acts purely as a mechanical stop to dial in the exact retract distance during commissioning or product changeover, without needing external stops. It is important to note that this adjuster and the variable air cushions decelerate the travel end but do not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting options span Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAIJ40BX500-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SAIJ40BX500-20S Is Used
Machine Setup Changeover
Quickly dial in the 480-500 mm retract position during product size changeovers without replacing the cylinder or adding external mechanical stops.
Variable End-Stop Diverter
Fine-tune the stroke end-position on a sorting line to handle different package dimensions on the fly using the rear adjustment screw.
Adjustable Clamping Depth
Set the exact travel window for clamping operations where material thickness varies, relying on the 628 N pull force at 0.5 MPa.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-20S the Right Cylinder?
Choose this 40 mm bore when you need 628 N pull force at 0.5 MPa and require precise retract tuning on a 500 mm stroke. If your application demands less force, stepping down to a 32 mm bore yields 345 N pull, while stepping up to a 50 mm bore provides 825 N pull. The adjustable stroke is ideal for machine setups requiring variable end-stops without swapping cylinders, unlike a fixed-stroke SAI model. Because the 500 mm stroke is substantial, the 16 mm rod and M12x1.25 thread handle moderate side loads, but an external guide is recommended for long unsupported travel.
This SAIJ40X500-20-S is dimensionally interchangeable per ISO 15552. It features PT tapered ports, the specified mounting set, a SUS304 rod, and a -S magnet for position sensing. It operates at speeds of 30-800 mm/s. Remember that the rear adjuster is a travel stop, not a lock; maintain live air for position holding.
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 SAIJ40BX500-20S FAQ
The rear adjuster allows you to shorten the effective stroke by up to 20 mm, creating a usable travel window of 480-500 mm. It acts as a mechanical stop for fine-tuning end positions at commissioning, but it is not a lock and requires live air to hold the load.
At 0.5 MPa, it provides 628 N of pull force and 879 N of push force at 0.7 MPa. The -S suffix indicates an integrated magnet, allowing you to use AirTAC CMSE reed switches or DMSE electronic solid-state sensors in the dual-side barrel grooves.
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