This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ50X40-30, 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 SIJ50X40-30
The AirTAC SIJ50 Double Rod Adjustable Cylinder SIJ50X40-30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ50X40-30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ50X40-30
- 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 SIJ50X40-30
The AirTAC SIJ50X40-30 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 50 mm bore and 40 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, giving a usable extend range of 10-40 mm. The stop screw sets the end position but is not a load lock.
The direct replacement is the SAIJ50X40-30, sharing the same ISO 15552 interface, force, 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 this SKU lacks a magnet (-S) and cannot take a sensor; for held loads use SAIL or BSAI.
Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X40-30 Technical Specifications
| Model | Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X40-30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ50X40-30 |
| Bore size | Ø50 mm |
| Stroke | 40 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 SAIJ50X40-30 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 SAIJ50X40-30 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 SIJ50X40-30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 SIJ50X40-30 Is Used
Diverter Gate Positioning
Allows operators to manually tune the extend stroke by up to 30 mm on-site to perfectly seat a diverter flap without machining new hard stops.
Light Transfer Stops
Provides an adjustable physical end-stop for lightweight product routing, letting the 10-40 mm window compensate for varying package widths.
Replacing the Airtac SIJ50 Double Rod Adjustable Cylinder SIJ50X40-30 with the SAIJ50X40-30
To replace the discontinued SIJ50X40-30, order the SAIJ50X40-30 direct, reusing your existing FA, LB, or TC ISO 15552 mounts. The 30 mm adjust window is ideal if your end-stop needs field tuning between 10 and 40 mm. Because this SKU has no -S magnet, it cannot accept a position sensor; add an external switch bracket if sensing is required. Since the 40 mm stroke is under 300 mm, side-load rod deflection is minimal. Remember the adjust stop sets position only; it is not a lock, so for load-holding without live air specify a SAIL or BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ50X40-30
- ✓ 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 SIJ50X40-30 FAQ
Yes, the SIJ50X40-30 is discontinued. The direct replacement is the SAIJ50X40-30. It shares the same ISO 15552 interface, 50 mm bore, 40 mm stroke, 30 mm adjust window, G1/4 port, and mounting options. The SAIJ upgrade also features a two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 30 mm adjust window, allowing you to trim the 40 mm nominal extend stroke down to 10 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ50X40-30
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ50X40-30 replacement — usually within 7-8 hours.