This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-20, 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 SIJ50X75-20
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20 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 SAIJ50X75-20, 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 → SAIJ50X75-20
- 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 SIJ50X75-20
The AirTAC SIJ50X75-20 is a discontinued double-acting double-rod adjustable-stroke ISO 15552 cylinder. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, giving a usable 55-75 mm range from the 75 mm nominal maximum. As this SKU lacks a -S magnet, it cannot accept a magnetic switch.
This SIJ model is discontinued and replaced by the SAIJ50X75-20 direct: identical ISO 15552 mounting interface, bore, stroke, force, and port. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop screw sets end position only; it is not a load lock, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-20 |
| 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 SAIJ50X75-20 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 SAIJ50X75-20 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 SIJ50X75-20
| 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 SIJ50X75-20 Is Used
Press Fit Tuning
Dial in the exact 55-75 mm extend position for inserting inserts into castings without machining hard stops.
Divert Arm Stroke
Shorten the extend stroke by up to 20 mm on-site to adapt a diverting gate to varying package widths.
Sealing Head Adjust
Trim the extend end position to set precise contact pressure on carton sealing flaps of different heights.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-20 with the SAIJ50X75-20
To replace the discontinued SIJ50X75-20, order the SAIJ50X75-20 direct, which preserves the G1/4 port, 75 mm nominal stroke, 20 mm adjust window, and ISO 15552 mounting. Choose the 20 mm adjust window when you need on-site extend tuning between 55 and 75 mm. Reuse FA, LB, or TC mounts. Because this SKU has no -S magnet, it cannot take a sensor; add -S for legacy CS1-B/DS1-B switch accuracy. The external stop sets end position but is not a lock. For stroke lengths over 300 mm, verify side-load limits.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-20
- ✓ 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 SIJ50X75-20 FAQ
Yes, the SIJ50X75-20 is discontinued. The direct replacement is the SAIJ50X75-20, sharing the same ISO 15552 interface, 50 mm bore, 75 mm stroke, 20 mm adjust window, G1/4 port, and mounting.
The external stop screw window is 20 mm, allowing you to trim the extend stroke from the 75 mm maximum down to 55 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-20 replacement — usually within 7-8 hours.