This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-30S, 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 SIJ50X75-30S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-30S 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 SAIJ50X75-30S, 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 → SAIJ50X75-30S
- 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 SIJ50X75-30S
The AirTAC SIJ50X75-30S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued and replaced by the SAIJ50X75-30S. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, giving a usable 45-75 mm extension out of the 75 mm nominal maximum.
The SAIJ direct maintains the exact ISO 15552 mounting interface, force, and adjust window, but upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. The stop screw sets end position but is not a load lock; use SAIL or BSAI for held loads.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-30S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-30S |
| 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 SAIJ50X75-30S 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 SAIJ50X75-30S 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 SIJ50X75-30S
| 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 SIJ50X75-30S Is Used
Adjustable End-Stop Forming
Sheet metal bending operations needing precise, field-tunable extend endpoints within a 45-75 mm window to accommodate different material thicknesses without swapping cylinders.
Variable-Length Diverter
Package sorting lines where the diverter arm stroke must be trimmed on-site by up to 30 mm to handle varying box sizes while maintaining a standard ISO 15552 mounting footprint.
Tunable Sealing Head
Carton sealing machinery requiring exact downward travel adjustment to crush boxes lightly without damage, relying on the 825 N pull force at 0.5 MPa for smooth retraction.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-30S with the SAIJ50X75-30S
To replace the discontinued SIJ50X75-30S, order the direct replacement SAIJ50X75-30S, keeping the 75 mm maximum stroke and 30 mm adjust window. Choose the 30 mm adjust window if your application requires on-site tuning of the extend stroke within a 45-75 mm range. Mounting options include FA, LB, and TC brackets. The -S suffix indicates a built-in magnet for legacy CS1-B/DS1-B switches (the SAIJ uses current AirTAC switches). Because the nominal stroke is under 300 mm, side-load risks are minimal, but always verify guide alignment. The external stop sets end position and is not a lock; for load holding without live air, specify an external rod lock or the SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-30S
- ✓ 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 SIJ50X75-30S FAQ
Yes, the SIJ50X75-30S is discontinued. The direct replacement is the SAIJ50X75-30S.
The external stop screw allows trimming the extend stroke by up to 30 mm on-site, yielding a usable 45-75 mm extension. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-30S replacement — usually within 7-8 hours.