Airtac SAIJ40 Adjustable Cylinder SAIJ40X250-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40X250-40 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40X250-40
The AirTAC SAIJ40X250-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 250mm stroke that can be mechanically trimmed back by up to 40mm, creating a usable travel window of 210-250mm. This allows precise end-position tuning at commissioning without external stops. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
Within its 40mm bore, it generates 628N of push force and 528N of pull force at 0.5MPa using a 16mm carbon steel rod and M12x1.25 thread. The integrated variable air cushions at both ends manage deceleration across its 30-800mm/s speed range. The rear adjuster acts strictly as a travel stop to set the retract position and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X250-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40X250-40 |
|---|---|
| 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 SAIJ40X250-40
| 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 SAIJ40X250-40 Is Used
Machine Changeover
Dial in the 210-250mm travel window during product size changes without swapping cylinders or repositioning external hard stops.
End-Position Tuning
Fine-tune the retract end-stop during commissioning to absorb mechanical tolerance stack-ups in the fixture.
Variable Diverter
Adjust the actuation length on a sorting diverter to accommodate different package sizes on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40X250-40 the Right Cylinder?
Choose this 40mm bore adjustable-stroke cylinder when your application requires 628N of thrust at 0.5MPa but needs on-the-fly end-position tweaking during product changeovers. If your process demands less force, stepping down to a 32mm bore yields 402N; for heavier loads, a 50mm bore provides 982N. The SAIJ40X250-40 is selected over a fixed SAI cylinder when you need a variable end-stop rather than a rigid hard stop.
Because the 250mm stroke exceeds 300mm is not met here, but long unsupported strokes still benefit from an external guide to prevent rod side-loading. This SKU uses a PT tapered port thread and supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). For position holding without live air, explore the SAIL or BSAI series instead.
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 SAIJ40X250-40 FAQ
At 0.5MPa operating pressure, this 40mm bore cylinder generates 628N of push force and 528N of pull force. It can reach up to 1130N push force at 0.9MPa.
A rear external screw acts as a mechanical stopper, allowing you to shorten the effective stroke from 250mm down to 210mm. This stopper sets the travel end and relies on the air cushion for deceleration, but it does not lock the load without continuous air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40X250-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.