This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX95, 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 SI50BX95
The AirTAC Airtac SI50 Standard Cylinder SI50BX95 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 95mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX95, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke95 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX95
- 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 SI50BX95
The AirTAC SI50BX95 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 95mm stroke. It delivers 982N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50BX95, a direct sharing the exact ISO 15552 mounting interface, stroke and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU has no magnet, so it cannot accept a CS1-B/DS1-B sensor.
The SAI family introduces variants the SI lacked, including the SAIL air-released lock, SAIF built-in valve and BSAI clamp-lock. The rod is SUS304 stainless (-B option) instead of carbon steel, and Viton H seals raise the temperature limit to 150C.
Airtac SI50 Standard Cylinder SI50BX95 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX95 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX95 |
| Bore size | Ø50 mm |
| Stroke | 95 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 SAI50BX95 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 SAI50BX95 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 SI50BX95
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×95 | 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 SI50BX95 Is Used
Package Diversion
Drives routing gates on packaging lines where the 982N push force at 0.5MPa easily deflects medium-weight cartons.
Stopper Arms
Raises and lowers pneumatic stoppers at assembly stations, utilizing the 30mm adjustable cushion for smooth end-of-stroke deceleration.
Replacing the Airtac SI50 Standard Cylinder SI50BX95 with the SAI50BX95
To replace the discontinued SI50BX95, order the SAI50BX95. It drops into existing fixtures using the same ISO 15552 mounting interface, 50mm bore, 95mm stroke, G1/4 port and M16x1.5 rod thread. Because this specific SKU lacks the -S magnet, it cannot support position sensing; if you need switches, select an SAI50BX95S and use current AirTAC sensors. If you need more force, the neighbouring 63mm bore provides 1559N push at 0.5MPa; if less is required, the 40mm bore offers 628N. Note that a standard cylinder drifts on air loss—the cushion only decelerates—so for load holding consider the SAIL lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX95
- ✓ 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 SI50BX95 FAQ
Yes, the SI50BX95 is discontinued. The direct replacement is the SAI50BX95. It shares the identical ISO 15552 mounting interface, 50mm bore, 95mm stroke, G1/4 port and output force, so it fits existing fixtures without modification.
This double-acting cylinder has a G1/4 air port. The thrust ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Request a Quote for the SAI50BX95
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX95 replacement — usually within 7-8 hours.