Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40 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 SAIJ40BX500-40
The AirTAC SAIJ40X500-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 460 to 500 mm. Delivering 628 N of push force at 0.5 MPa, it utilizes a 16 mm SUS304 stainless steel rod (code B) for superior corrosion resistance. The barrel is an extruded aluminum profile with sensor grooves on both sides, ready for CMSE or DMSE switches if a magnet is added later.
This model uses a PT tapered G1/4 port and includes variable air cushions at both ends to decelerate the payload smoothly. The rear adjustment screw functions purely as a travel stop for fine-tuning end positions during commissioning; it does not lock or hold the load without live air pressure. The mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40 |
|---|---|
| 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 SAIJ40BX500-40
| 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 SAIJ40BX500-40 Is Used
Variable End-Stop Setup
Dial in the 460-500 mm travel window during machine commissioning to perfectly position parts without machining new hard stops.
Product Changeover
Quickly adjust the retract end-position on a packaging line when switching to a different product size, saving setup time.
Fine-Tune Assembly
Use the 40 mm rear adjuster to fine-tune the pressing depth of a 628 N assembly operation directly at the fixture.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX500-40 the Right Cylinder?
Choose this 40 mm bore cylinder when you need 628 N of push force at 0.5 MPa, which is a step up from the 32 mm bore (402 N) but lighter than the 50 mm bore (982 N). An adjustable stroke is ideal for machine setups requiring variable end-stops or product changeovers, allowing you to dial in the exact 460-500 mm travel without swapping out a fixed-stroke SAI cylinder or adding external stops.
Because the stroke is 500 mm, the 16 mm rod requires an external guide to prevent excessive side-loading and premature seal wear. For load-holding applications without live air pressure, this cylinder will not suffice; consider the SAIL series with an air-released lock or the BSAI clamp-lock variant. This SAIJ40X500-40 is dimensionally interchangeable per ISO 15552, features a PT port, and lacks a standard 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 SAIJ40BX500-40 FAQ
The nominal stroke is 500 mm, but the rear adjuster allows you to shorten the effective travel by up to 40 mm, providing a usable window of 460 to 500 mm.
No, the SAIJ40X500-40 is double-acting and its rear screw is only a travel stop, not a lock. For load-holding without live air, use a SAIL or BSAI cylinder.
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