This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX30, 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 SI50BX30
The AirTAC Airtac SI50 Standard Cylinder SI50BX30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 30mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX30
- 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 SI50BX30
The AirTAC SI50BX30 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 30mm stroke. It delivers 982N push and 825N pull at 0.5MPa, utilizing a G1/4 port and M16x1.5 rod thread. AirTAC replaced this legacy unit with the SAI50BX30, a direct sharing the exact ISO 15552 mounting interface, force, and dimensions.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet, so it cannot accept a CS1-B/DS1-B sensor. The -B rod option uses SUS304 stainless steel for corrosion resistance, while Viton H seals raise heat limits to 150C.
Airtac SI50 Standard Cylinder SI50BX30 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX30 |
| Bore size | Ø50 mm |
| Stroke | 30 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 SAI50BX30 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 SAI50BX30 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 SI50BX30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SI50BX30 Is Used
Short-Stroke Clamping
Ideal for holding parts during machining, using the 982N push force at 0.5MPa to secure components firmly within a compact 30mm travel.
Package Diverting
Provides rapid 30mm actuation for routing small to medium packages on a line, operating at speeds of 30-800 mm/s without complex linkages.
Part Ejection
Delivers fast, repeatable ejection of finished parts from press beds or molds, where the 825N pull force easily retracts the mechanism.
Replacing the Airtac SI50 Standard Cylinder SI50BX30 with the SAI50BX30
To replace the SI50BX30, order the SAI50BX30 to retain the 50mm bore, 30mm stroke, G1/4 port, and ISO 15552 mounting. Confirm your thread type (PT/G/NPT) and accessory (LB, FA, TC). Because this SKU has no magnet, you cannot mount switches; add the -S suffix on the SAI if you need CS1-B/DS1-B sensing. Sizing both ways: a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for held loads. The 30mm stroke is short, minimizing rod-bending side-load risks.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX30
- ✓ 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 SI50BX30 FAQ
Yes, the AirTAC SI50BX30 is discontinued. The direct replacement is the SAI50BX30. It shares the identical ISO 15552 mounting interface, 50mm bore, 30mm stroke, 982N force, and G1/4 port, fitting directly into existing fixtures.
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 maximum of 200kgf at 1.0MPa. It operates at speeds between 30 and 800 mm/s.
Request a Quote for the SAI50BX30
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX30 replacement — usually within 7-8 hours.