This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X245, 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 SI50X245
The AirTAC Airtac SI50 Standard Cylinder SI50X245 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 245mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X245, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke245 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X245
- 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 SI50X245
The AirTAC SI50X245 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 245 mm stroke, delivering 982 N push force at 0.5 MPa. It features a Ø20 mm rod, M16x1.5 thread, 30 mm cushions and a G1/4 port. The direct replacement is the SAI50X245, matching the interface, bore, stroke, force and mounting.
Because this SKU lacks the -S magnet, it cannot accept position switches like the legacy CS1-B/DS1-B sensors. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note the air cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X245 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X245 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X245 |
| Bore size | Ø50 mm |
| Stroke | 245 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 SAI50X245 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 SAI50X245 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 SI50X245
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×245 | 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 SI50X245 Is Used
Package Diverting
Actuates routing gates on packaging lines using the 245 mm stroke to shift parcels cleanly between adjacent belts.
Vertical Lift Stops
Raises and lowers pallet stops in low-force material handling tasks, safely moving loads up to 50 kg.
Clamp Actuation
Drives mid-force clamping mechanisms on machining fixtures where a 982 N thrust secures the workpiece.
Replacing the Airtac SI50 Standard Cylinder SI50X245 with the SAI50X245
To replace the SI50X245, order the SAI50X245 direct cylinder, confirming the ISO 15552 mounting interface, 245 mm stroke, G1/4 port (PT/G/NPT thread) and your specific mounting accessory (LB, FA, TC, etc.). This non-magnetic SKU cannot take sensors, so if position detection is needed, specify the SAI50X245S with a magnet to use current AirTAC switches. Sizing both ways: the 50 mm bore yields 982 N push at 0.5 MPa, while the neighbouring 40 mm bore provides 628 N. For suspended loads, a plain cylinder drifts on air loss—the cushion only decelerates—so specify the SAIL lock or BSAI clamp-lock variant, or add an external rod lock. The SAI family also offers the SAIF self-valve option (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X245
- ✓ 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 SI50X245 FAQ
Yes, the AirTAC SI50X245 is discontinued. The direct replacement is the SAI50X245. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the exact 50 mm bore, 245 mm stroke, 982 N force, G1/4 port and mounting fixtures.
The 50 mm bore cylinder uses a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 30 mm adjustable cushion at each end.
Request a Quote for the SAI50X245
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X245 replacement — usually within 7-8 hours.