This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X75-40SN, 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 SIJ50X75-40SN
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40SN 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 SAIJ50X75-40SN, 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 → SAIJ50X75-40SN
- 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 SIJ50X75-40SN
The AirTAC SIJ50X75-40SN 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 40 mm on-site, giving a usable 35-75 mm window from the 75 mm nominal maximum. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches, while -N denotes NBR seals rated for -20 to +70 C.
The direct replacement is the SAIJ50X75-40SN, matching the ISO 15552 mounting interface, bore, stroke, force, and port. The SAIJ family introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer 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 SIJ50X75-40SN Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X75-40SN |
| 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 SAIJ50X75-40SN 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 SAIJ50X75-40SN 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 SIJ50X75-40SN
| 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 SIJ50X75-40SN Is Used
Variable Depth Spot Facing
Machine operators trim the extend stroke by up to 40 mm on-site to hit changing facing depths without swapping the entire ISO 15552 cylinder body.
Adjustable Carton Flap Folding
An external stop screw sets precise flap contact positions for varying box heights, using the 35-75 mm usable window to prevent crushing.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X75-40SN with the SAIJ50X75-40SN
To replace the discontinued SIJ50X75-40SN, order the direct replacement SAIJ50X75-40SN, reusing your existing FA, LB, or TC ISO 15552 mounts. The 40 mm adjust window lets you tune the extend stroke down to 35 mm on-site. Retain the -S magnet for current AirTAC switches and -N NBR seals. Because the 75 mm stroke is under 300 mm, side-load rod deflection is minimal. Remember the stop screw is not a lock; for load holding on air loss, specify a SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X75-40SN
- ✓ 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 SIJ50X75-40SN FAQ
Yes, the SIJ50X75-40SN is discontinued. The direct replacement is the SAIJ50X75-40SN, offering the same ISO 15552 interface, 75 mm stroke, 40 mm adjust window, G1/4 port, and force. The SAIJ upgrade features a two Y-shaped one-way piston seal for longer life.
The external stop screw trims the extend stroke by up to 40 mm on-site, yielding a 35-75 mm usable window. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X75-40SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X75-40SN replacement — usually within 7-8 hours.