This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X80-40S, 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 SIJ50X80-40S
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X80-40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X80-40S
- 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 SIJ50X80-40S
The AirTAC SIJ50X80-40S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, giving a usable 40-80 mm extend range from the 80 mm nominal maximum.
This SIJ model is discontinued; the direct replacement is the SAIJ50X80-40S, matching the ISO 15552 interface, bore, stroke, force, and mounting. The SAIJ upgrade uses 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 SIJ50X80-40S Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X80-40S |
| Bore size | Ø50 mm |
| Stroke | 80 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 SAIJ50X80-40S 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 SAIJ50X80-40S 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 SIJ50X80-40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SIJ50X80-40S Is Used
Diverter Gate Positioning
Allows field tuning of the extend stroke by up to 40 mm to precisely set the resting position of a diverter gate without machining new hard stops.
Product Pusher Stroke Trim
Adjusts the extend distance on-site to accommodate varying package widths on a conveyor line, ensuring positive contact without overtravel.
Sealing Head Height
Provides a 40 mm adjustment window to dial in the exact extend position of a packaging sealing head, compensating for material thickness variations.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X80-40S with the SAIJ50X80-40S
To replace the discontinued SIJ50X80-40S, order the direct replacement SAIJ50X80-40S (insert A after the leading S), keeping the 50 mm bore, 80 mm stroke, 40 mm adjust window, G1/4 port, and -S magnet for legacy CS1-B/DS1-B switches. Choose the 40 mm adjust window if your extend stroke needs on-site tuning between 40 and 80 mm. Mounting interfaces (Basic, FA, LB, TC) are reusable ISO 15552 attachments. Because the 80 mm stroke is under 300 mm, side-load leverage is minimal. The stop screw sets end position but does not hold load on air loss; for held loads use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X80-40S
- ✓ 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 SIJ50X80-40S FAQ
Yes, the SIJ50X80-40S is discontinued. The direct replacement is the SAIJ50X80-40S. It shares the same ISO 15552 interface, 50 mm bore, 80 mm stroke, 40 mm adjust window, G1/4 port, and mounting options, but adds an upgraded two Y-shaped one-way piston seal.
The external stop screw provides a 40 mm adjust window, allowing the 80 mm nominal extend stroke to be shortened to a minimum of 40 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X80-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X80-40S replacement — usually within 7-8 hours.