This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX5, 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 SI50BX5
The AirTAC Airtac SI50 Standard Cylinder SI50BX5 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 5mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX5, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke5 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX5
- 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 SI50BX5
The AirTAC SI50BX5 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 5 mm stroke. It delivers 982 N push force at 0.5 MPa. The direct replacement is the SAI50BX5, which shares the exact ISO 15552 mounting interface, G1/4 port, and 200 kgf max force. Note this 5 mm stroke is nonstandard (below the typical 25 mm minimum), requiring a custom rod.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet (-S) and cannot take a sensor. The -B rod is SUS304 stainless; Viton H seals allow 0-150 C heat.
Airtac SI50 Standard Cylinder SI50BX5 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX5 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX5 |
| Bore size | Ø50 mm |
| Stroke | 5 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 SAI50BX5 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 SAI50BX5 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 SI50BX5
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×5 | 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 SI50BX5 Is Used
Short-Stroke Clamping
Ideal for tight clamping tasks in machining fixtures where a 5 mm travel securely holds parts without consuming valuable tooling space.
Ejector Pins
Provides rapid 5 mm ejection of small components from molds or assembly nests, operating at speeds up to 800 mm/s.
Valve Actuation
Suitable for toggling small process valves or diverters, delivering 982 N push force at 0.5 MPa within a compact footprint.
Replacing the Airtac SI50 Standard Cylinder SI50BX5 with the SAI50BX5
To replace this SI50BX5, order the SAI50BX5. Confirm the ISO 15552 mounting interface, the 50 mm bore, the 5 mm custom stroke, the G1/4 port, and the SUS304 (-B) rod. Because this is a nonstandard 5 mm stroke, verify the rod-end M16x1.5 thread and cushion dimensions with engineering. If you need more force, the neighbouring 63 mm bore yields 1559 N push at 0.5 MPa; if less is required, the 40 mm bore offers 628 N. This plain cylinder drifts on air loss—the 30 mm cushion only decelerates—so use a pilot check valve or the SAIL/BSAI lock variant to hold loads. Without a -S magnet, this SKU cannot accept CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX5
- ✓ 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 SI50BX5 FAQ
Yes, the AirTAC SI50BX5 is discontinued. The direct replacement is the SAI50BX5. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 5 mm stroke, G1/4 port, and mounting interface.
The G1/4 port is fixed by the 50 mm bore. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI50BX5
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX5 replacement — usually within 7-8 hours.