Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30S
The AirTAC SAIJ40X400-30-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster that permits up to 30 mm of end-position tuning. This specific SKU yields a usable travel window of 370-400 mm, allowing you to dial in the exact retract distance during commissioning without adding external stops or swapping the cylinder. It delivers a 0.5 MPa push force of 628 N and a pull force of 528 N, fitting a robust mid-range force class. The extruded aluminum barrel integrates dual sensor grooves compatible with CMSE reed and DMSE electronic switches, while the SUS304 stainless steel rod provides excellent corrosion resistance.
Because the nominal 400 mm stroke is substantial for a 40 mm bore, the 16 mm diameter rod and M12x1.25 thread provide rigidity, but an external guide is still recommended to prevent side-loading damage over the extended travel. The rear adjuster functions strictly as a travel stop to set deceleration, not as a load-holding lock; for fail-safe load holding without live air pressure, consider the SAIL or BSAI variants. This SAIJ model uses a PT tapered port thread and omits the FB, CA, CB, and CR mounting options, utilizing a reduced interface set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAIJ40BX400-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SAIJ40BX400-30S Is Used
Product Changeover
Dial in the 370-400 mm travel window during product size transitions on a packaging line without physically swapping out the actuator.
Machine Setup
Use the rear stopper to fine-tune the retract end-position during initial commissioning, eliminating the need to machine custom external spacers.
Variable End Stops
Adjust the effective stroke on the fly to accommodate multiple fixture heights within the same automated work cell.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-30S the Right Cylinder?
Select this 40 mm bore adjustable-stroke cylinder when your machine setup requires precise variable end-stops rather than a fixed 400 mm travel. If your application needs less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa, whereas stepping up to a 50 mm bore provides 982 N. The 30 mm adjustment window is ideal for product-size changeovers on a line, letting you fine-tune the retract position in minutes. When matching this for an ISO 15552 replacement, verify the 400 mm stroke, 30 mm adjustment, PT port, and the desired mounting bracket. For strokes of 400 mm or more, always support the load with an external guide to manage side loads. If you need to hold a load mid-stroke without constant air pressure, the SAIJ adjuster will not act as a brake; you must use a SAIL lock or an external pilot-operated check valve.
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 SAIJ40BX400-30S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. The 30 mm rear adjuster creates a usable travel window of 370 to 400 mm.
No, the rear adjuster acts only as a travel stop and cannot hold a load without live air. For fail-safe load holding, use an AirTAC SAIL or BSAI cylinder, or add an external rod lock.
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