Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100S
The AirTAC SAIJ40X250-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. By dialing back the nominal 250 mm stroke by up to 100 mm, you gain a highly flexible 150-250 mm usable travel window for fine-tuning end positions during machine setup. It delivers 628 N of push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
This adjustable-stroke model omits the FB, CA, CB, and CR mounting interfaces, retaining a focused set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts. The integrated -S magnet pairs directly with AirTAC CMSE reed and DMSE solid-state sensors fitted into the dual-side barrel grooves, while the PT tapered ports ensure a tight pneumatic seal.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 SAIJ40BX250-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SAIJ40BX250-100S Is Used
Machine Changeover
Dial in the 150-250 mm travel window during product size transitions without physically swapping out the entire cylinder.
End-Position Tuning
Fine-tune the retract end position at commissioning using the rear stopper, avoiding the need to add external hard stops.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod and 628 N force for reliable actuation in washdown or mildly corrosive manufacturing environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-100S the Right Cylinder?
Choose this 40 mm bore when an application requires precise variable end-stops and a 628 N push force at 0.5 MPa, stepping down from a 50 mm bore (982 N push) to save space, or up from a 32 mm bore (402 N push) for higher load capacity. The rear adjuster screw is a travel stop, not a locking mechanism; it will not hold the load without live air, so consider a SAIL or BSAI cylinder if true fail-safe holding is required.
Because the 250 mm stroke is substantial for a 40 mm bore, the 16 mm rod and M12x1.25 thread will experience amplified side-load stresses if the piston is unsupported. Always guide the load externally to prevent rod binding. To match this ISO 15552 replacement exactly, specify the 40 mm bore, 250 mm stroke, 100 mm adjustment, PT port thread, SUS304 (B) rod material, and the -S magnet option.
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 SAIJ40BX250-100S FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.7 MPa.
The rear adjusting screw acts as a mechanical stop that shortens the effective travel. For this SAIJ40X250-100-S model, it creates a usable stroke window ranging from 150 mm to 250 mm without changing the cylinder mount.
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