This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-75, 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 SIJ50X75-75
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75 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 SAIJ50X75-75, 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 → SAIJ50X75-75
- 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 SIJ50X75-75
The AirTAC SIJ50X75-75 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 75mm on-site, giving a usable extend range of 0-75mm. Because this SKU lacks a -S magnet, it cannot accept a magnetic switch for position sensing.
As the SIJ line is end-of-life, the direct replacement is the SAIJ50X75-75, retaining the same interface, 75mm maximum stroke, force, and mounting. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note the stop screw sets end position only; it is not a load lock.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-75 |
| 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 SAIJ50X75-75 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 SAIJ50X75-75 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 SIJ50X75-75
| 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 SIJ50X75-75 Is Used
Variable Depth Drilling Jig
Needs field stroke tuning to set precise drilling depths on-site without swapping cylinders, trimming the extend stroke within the 75mm window.
Adjustable Carton Flap Folder
Requires adapting to varying carton sizes on the fly, using the external stop screw to shorten the extend stroke for different flap heights.
Variable Position Diverter Gate
Demands exact end-position adjustment for sorting different product widths, utilizing the 0-75mm adjustable extend range to fine-tune the gate.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-75 with the SAIJ50X75-75
To replace the discontinued SIJ50X75-75, order the direct replacement SAIJ50X75-75, matching the 50mm bore, 75mm nominal stroke, 75mm adjust window, and G1/4 port. Choose the 75mm adjust window when you need maximum flexibility to trim the extend stroke down to zero on-site. Mounting reuses ISO 15552 interface dimensions including FA, LB, and TC styles. Because this SKU has no -S suffix, it cannot take a magnetic switch. For stroke lengths of 300mm or more, verify the rod-end side-load limits to prevent guide wear. The stop screw sets end position but is not a lock; for held loads use an external rod lock or the SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-75
- ✓ 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 SIJ50X75-75 FAQ
Yes, the SIJ50X75-75 is discontinued. The direct replacement is the SAIJ50X75-75, which shares the same ISO 15552 interface, 50mm bore, 75mm stroke, 75mm adjust window, and G1/4 port. The SAIJ family also features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw window is 75mm, allowing you to trim the extend stroke by up to 75mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-75 replacement — usually within 7-8 hours.