This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-40, 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 SIJ50X75-40
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40 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 SAIJ50X75-40, 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 → SAIJ50X75-40
- 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 SIJ50X75-40
The AirTAC SIJ50X75-40 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 50 mm bore and 75 mm maximum extend stroke. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, giving a usable 35-75 mm end position. The G1/4 port and M16x1.5 rod end thread are fixed by the bore. Because this SKU lacks a -S magnet, it cannot accept a magnetic switch for position sensing.
The direct replacement is the SAIJ50X75-40, matching the interface, force, port, and mounting. The SAIJ family uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note 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 SIJ50X75-40 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-40 |
| 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 SAIJ50X75-40 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 SAIJ50X75-40 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 SIJ50X75-40
| 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 SIJ50X75-40 Is Used
Press Fit Depth Tuning
Dial in exact 35-75 mm insertion depths for bearing or pin press fits without machining custom spacers, using the 40 mm external stop screw to set the final end position.
Variable Format Carton Forming
Adapt a carton erecting station on the fly for different box heights, shortening the extend stroke on-site to accommodate varied packaging formats quickly.
Adjustable Transfer Pusher
Set precise ejection distances for parts of varying lengths leaving a belt, relying on the external stop to tune the pusher stroke within the 40 mm window.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40 with the SAIJ50X75-40
To replace the discontinued SIJ50X75-40, order the direct replacement SAIJ50X75-40, reusing your existing FA, LB, or TC ISO 15552 mounts. Choose the 40 mm adjust window if you need on-site tuning of the extend end position within the 35-75 mm range. This non-magnetic SKU cannot take a sensor; if you need position detection, select a -S magnet model (legacy CS1-B/DS1-B accuracy). For strokes of 300 mm or longer, verify side-load limits to prevent guide wear. The stop screw only trims travel; it does not lock the load on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-40
- ✓ 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 SIJ50X75-40 FAQ
Yes, the SIJ50X75-40 is discontinued. The direct replacement is the SAIJ50X75-40, which shares the same ISO 15552 interface, 50 mm bore, 75 mm stroke, 40 mm adjust window, G1/4 port, and mounting options.
This 50 mm bore cylinder has a 40 mm adjust window (usable extend stroke 35-75 mm). The external stop sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-40 replacement — usually within 7-8 hours.