Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-20S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 290mm 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.
- BoreØ50 mm
- Stroke290 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-20S
The AirTAC SAIJ50X290-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a SUS420J2 stainless steel rod and a built-in magnet for position sensing. The rear adjustment screw allows you to trim the effective travel back by up to 20 mm, creating a precise 270 to 290 mm usable stroke window. This fine-tuning capability is ideal for dialing in exact end positions during machine commissioning or product changeovers without adding external stops.
Delivering 982 N of push force and 825 N of pull force at 0.5 MPa, this 50 mm bore cylinder handles robust actuation tasks. It uses PT tapered G1/4 ports and includes variable air cushions at both ends to manage deceleration. The extruded aluminum barrel features sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic switches exactly where needed. Because the stroke is 290 mm, the 20 mm diameter rod still requires external guidance if the load imposes significant lateral stress.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-20S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 290 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×290 | 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 SAIJ50 Adjustable Cylinder SAIJ50AX290-20S Is Used
Machine Commissioning
Dial in the exact end-of-stroke position within the 270-290 mm window during initial setup without swapping physical cylinders or adding shims.
Product Changeover
Quickly adjust the retract stopper on a packaging line to handle different carton lengths, reducing downtime between production runs.
Variable End Stops
Set precise retract positions for multiple tooling heads on an automated fixture, using the 20 mm adjustment range to fine-tune operations.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX290-20S the Right Cylinder?
Selecting this 50 bore over a 40 mm bore gives you a substantial force jump from 628 N to 982 N at 0.5 MPa, whereas stepping up to a 63 mm bore would yield 1559 N. The adjustable stroke is chosen when a fixed-stroke SAI cylinder cannot accommodate minor dimensional variances on an assembly line. Instead of machining custom spacers, you simply turn the rear stopper to shift the 270-290 mm travel window. Remember that the rear adjuster acts only as a travel stop; it does not lock the load. If you need true fail-safe load holding without live air pressure, use an SAIL pneumatic lock, a BSAI clamp-lock, or an external pilot-operated check valve.
To replace an ISO 15552 cylinder, match the 50 mm bore, 290 mm nominal stroke, 20 mm adjustment range, PT G1/4 port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, but omits FB, CA, CB, and CR brackets. With a 290 mm stroke, you must use an external guide rail to prevent side-load damage to the rod seals.
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 SAIJ50 Adjustable Cylinder SAIJ50AX290-20S FAQ
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 200 kgf.
A rear external stopper screw lets you shorten the 290 mm nominal stroke by up to 20 mm, giving a usable travel window of 270 to 290 mm. This stopper only sets the end position; it does not lock the load without live air pressure.
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