This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X15, 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 SI50 Standard Cylinder SI50X15
The AirTAC Airtac SI50 Standard Cylinder SI50X15 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X15, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X15
- 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 SI50 Standard Cylinder SI50X15
The AirTAC SI50X15 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 15mm stroke, delivering 982N push force at 0.5MPa through a G1/4 port. Because this legacy unit is end-of-life, AirTAC mandates the SAI50X15 as the direct successor. It retains the same interface, bore, stroke, output force, and mounting dimensions, dropping cleanly into existing fixtures.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. For load retention, note that a standard cylinder drifts on air loss since cushions only decelerate; use a pilot check valve or the SAIL lock variant for holding. This no-magnet SKU cannot accept a sensor.
Airtac SI50 Standard Cylinder SI50X15 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X15 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X15 |
| Bore size | Ø50 mm |
| Stroke | 15 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 SAI50X15 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 SAI50X15 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X15
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×15 | 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 SI50 Standard Cylinder SI50X15 Is Used
Short-Stroke Clamping
Ideal for holding parts during machining with a firm 982N push force at 0.5 MPa over a rapid 15mm travel distance.
Ejector Mechanisms
Provides fast 30-800 mm/s ejection of finished components from fixtures, utilizing the adjustable 30mm air cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X15 with the SAI50X15
To replace the discontinued SI50X15, order the SAI50X15. Verify your ISO 15552 mounting interface, G1/4 port thread (PT/G/NPT), and M16x1.5 rod-end thread. Because this specific SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B switches; if position sensing is required, select an SAI50X15S instead. Sizing both ways: the 50mm bore yields 982N push at 0.5MPa, while the neighboring 40mm bore offers 628N. For applications needing integrated load holding on air loss, specify the SAIL air-released lock or BSAI clamp-lock variant, as standard cushions only decelerate. The 15mm stroke is well within limits, so no side-load guide concerns apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X15
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X15 FAQ
Yes, the AirTAC SI50X15 is discontinued. The direct replacement is the SAI50X15. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 15mm stroke, 982N force, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port and M16x1.5 rod thread. It delivers 982N push and 825N pull at 0.5 MPa, 1374N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X15
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X15 replacement — usually within 7-8 hours.