This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-50STC, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X75-50STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X75-50STC
- 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 SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC
The AirTAC SIJ50X75-50STC is a discontinued double-acting, double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 25-75 mm extend window from the 75 mm nominal maximum. This SIJ model is discontinued; the direct replacement is the SAIJ50X75-50STC, matching the ISO 15552 interface, force, and TC mounting.
The SAIJ upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and longer life. Because the stop screw only sets the end position and is not a load lock, you must add an external rod lock for hold. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-50STC |
| Bore size | Ø50 mm |
| Stroke | 75 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 standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ50X75-50STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAIJ50X75-50STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC Is Used
Diverter Gate Actuation
Conveyor sorting gates requiring precise field-tuned extend stops to route packages accurately without re-mounting hardware.
Variable Depth Carton Sealing
Packaging lines processing multiple carton sizes use the 50 mm adjust window to set exact flap contact on the fly.
Adjustable Forming Press
Light assembly presses needing a 25-75 mm working stroke to accommodate different material heights or stack thicknesses.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC with the SAIJ50X75-50STC
To replace the discontinued SIJ50X75-50STC, order the direct replacement SAIJ50X75-50STC, which retains the 50 mm bore, 75 mm nominal stroke, 50 mm adjust window, G1/4 port, and TC mounting interface. Choose the 50 mm adjust window if your application requires field tuning the extend stroke down to 25 mm. The included TC mount allows center-trunnion pivoting. The -S magnet supports legacy CS1-B/DS1-B switches. For stroke lengths >=300 mm, verify side-load limits to prevent guide bushing wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-50STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-50STC FAQ
Yes, the SIJ50X75-50STC is discontinued. The direct replacement is the SAIJ50X75-50STC. It shares the same ISO 15552 interface, 50 mm bore, 75 mm stroke, 50 mm adjust window, G1/4 port, and TC mounting. The SAIJ upgrade features a two-piece Y-shaped piston seal for lower start-up pressure and longer life.
The external stop screw provides a 50 mm adjust window, allowing the 75 mm nominal extend stroke to be shortened to a minimum of 25 mm on-site. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-50STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-50STC replacement — usually within 7-8 hours.