This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ100X50-20S, 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 SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S
The AirTAC SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ100X50-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAIJ100X50-20S
- 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 SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S
The AirTAC SIJ100X50-20S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 20mm on-site, yielding a usable 30-50mm extend window from the 50mm nominal maximum. The stop screw sets the end position; it is not a load lock.
This SIJ model is discontinued. The direct replacement is the SAIJ100X50-20S, matching the ISO 15552 mounting interface, bore, stroke, force, and adjust window. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. A plain cylinder drifts on air loss; for held loads use an external rod lock or SAIL/BSAI variant.
Airtac SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S Technical Specifications
| Model | Airtac SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ100X50-20S |
| Bore size | Ø100 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ100X50-20S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAIJ100X50-20S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×50 | 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 SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S Is Used
Press Fit Tuning
Dial in the exact 30-50mm insertion depth for bearings on an assembly line without machining custom spacers.
Variable Length Diverter
Adjust the extend stroke on-site to deflect different package sizes accurately without swapping the cylinder.
Adjustable End Stop
Set precise end positions for palletizing probes in the field, allowing rapid 20mm retraction for format changes.
Replacing the Airtac SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S with the SAIJ100X50-20S
To replace the discontinued SIJ100X50-20S, order the direct replacement SAIJ100X50-20S, which preserves the G1/2 port, M20x1.5 rod thread, and 36mm adjustable cushion. Choose the 20mm adjust window if your fixture needs field tuning between 30mm and 50mm extend; this integrated stop beats a fixed SAI plus external stop by saving build space. Mounting options include FA, LB, and TC brackets. The -S suffix provides a piston magnet for switch sensing. For strokes at or above 300mm, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ100X50-20S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ100 Double Rod Adjustable Cylinder SIJ100X50-20S FAQ
Yes, the SIJ100X50-20S is discontinued. The direct replacement is the SAIJ100X50-20S. It shares the identical ISO 15552 interface, 100mm bore, 50mm stroke, 20mm adjust window, G1/2 port, and mounting dimensions. The SAIJ family also adds upgraded piston seals and lock variants like SAIL and BSAI.
The external stop screw allows you to trim the extend stroke by up to 20mm on-site, giving a usable 30-50mm stroke. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ100X50-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ100X50-20S replacement — usually within 7-8 hours.