This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX95S, 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 SI50BX95S
The AirTAC Airtac SI50 Standard Cylinder SI50BX95S 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 SAI50BX95S, 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 → SAI50BX95S
- 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 SI50BX95S
The AirTAC SI50BX95S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 95mm stroke, and a SUS304 stainless piston rod. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this with the SAI50BX95S, a direct sharing the exact ISO 15552 mounting interface, stroke, and force.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp variants the SI lacked.
Airtac SI50 Standard Cylinder SI50BX95S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX95S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX95S |
| 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 SAI50BX95S 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 SAI50BX95S 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 SI50BX95S
| 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 SI50BX95S Is Used
Stainless Rod Clamping
Ideal for packaging machines requiring corrosion resistance, using the SUS304 rod to clamp materials with a 982N push force at 0.5 MPa.
95mm Transfer Divert
The nonstandard 95mm stroke precisely indexes products between conveyor lanes without overshooting, fitting tight fixture spacing.
Replacing the Airtac SI50 Standard Cylinder SI50BX95S with the SAI50BX95S
To replace the SI50BX95S, order the SAI50BX95S keeping the exact 50mm bore, 95mm stroke, SUS304 rod, and -S magnet. Verify your ISO 15552 mounting accessory (LB, FA, TC) and G1/4 port. Sizing both ways: a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. Note that 95mm is a nonstandard stroke. Because plain cylinders drift on air loss, use an external rod lock or pilot check valve for held loads; consider SAIL or BSAI lock variants. For 95mm stroke, guide external rods to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX95S
- ✓ 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 SI50BX95S FAQ
Yes, the SI50BX95S is discontinued. The direct replacement is the SAI50BX95S. It shares the identical ISO 15552 mounting interface, 50mm bore, 95mm stroke, output force, G1/4 port, and mounting accessories, fitting existing fixtures perfectly.
This 50mm bore cylinder uses a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. It features a 30mm adjustable air cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX95S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX95S replacement — usually within 7-8 hours.