Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-40S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-40S
The AirTAC SAIJ80X250-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end position. With a 250mm nominal stroke and a 40mm adjustment range, it provides a usable travel window of 210-250mm. This enables precise end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers 2513N of pull force at 0.5 MPa and 3518N of push force at 0.7 MPa.
This variant includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and an integrated magnet (-S) for position sensing. It works seamlessly with AirTAC CMSE reed switches and DMSE solid-state electronic sensors fitted into the dual-side sensor grooves. The standard variable air cushions at both ends decelerate the load, but note that the rear adjuster and cushions act as travel stops and deceleration devices, not a load-holding lock.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-40S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max stroke | Up to 1500 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | 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 SAIJ80 Adjustable Cylinder SAIJ80AX250-40S Is Used
Machine Changeovers
Dial in the 210-250mm travel window during product size changeovers to set new retract stops without disassembling the line.
End-Position Tuning
Fine-tune the retract end position at commissioning using the rear adjuster to perfect tooling alignment without external stops.
Variable Diverter Stops
Adjust the stroke on the fly for conveyor diverters handling different package sizes, relying on the 2513N pull force to move loads.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-40S the Right Cylinder?
Choose this 80mm bore when an application requires more force than a 63mm cylinder (which provides 1402N pull at 0.5 MPa) but without stepping up to the larger 100mm bore (3681N pull). The adjustable 210-250mm travel window is ideal for machine setups requiring variable end-stops or frequent product-size changeovers, offering flexibility that a fixed-stroke SAI cylinder cannot match. To replace an ISO 15552 cylinder, match the 80mm bore, 250mm stroke, 40mm adjustment, PT G3/8 port, and the -S magnet requirement. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the stroke is 250mm, the 25mm rod and M20x1.5 thread handle side loads well, but an external guide is recommended for unsupported loads. For load-holding without live air pressure, use a SAIL or BSAI cylinder 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 SAIJ80 Adjustable Cylinder SAIJ80AX250-40S FAQ
At 0.5 MPa, this 80mm bore cylinder provides 2513N of pull force and 2513N of push force. At 0.7 MPa, the push force increases to 3518N.
The rear adjuster acts as a mechanical stop that lets you shorten the 250mm nominal stroke by up to 40mm, creating a usable travel window of 210-250mm. It sets the end position but does not hold the load without live air.
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