This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX75, 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 SI50BX75
The AirTAC Airtac SI50 Standard Cylinder SI50BX75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX75
- 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 SI50BX75
The AirTAC SI50BX75 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982 N push force at 0.5 MPa and features a G1/4 air port. As an end-of-line product, it is replaced by the SAI50BX75, a direct upgrade retaining the exact same interface, bore, stroke, force, port and mounting.
The SAI upgrade introduces an advanced piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SKU lacks a magnet and cannot accept position sensors.
Airtac SI50 Standard Cylinder SI50BX75 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX75 |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAI50BX75 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 SAI50BX75 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 SI50BX75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50BX75 Is Used
Package Diverting
Actuates diverters on packaging lines where 982 N push force easily redirects standard cartons at speeds up to 800 mm/s.
Clamp Actuation
Provides reliable clamping pressure for mid-weight machining fixtures, utilizing the 825 N pull force at 0.5 MPa.
Replacing the Airtac SI50 Standard Cylinder SI50BX75 with the SAI50BX75
To replace the SI50BX75, order the SAI50BX75. Verify that your fixture uses the ISO 15552 mounting interface (LB, FA, TC, etc.) and the G1/4 port. Because this SKU lacks a magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, you must select an SAI model with the -S magnet option. Sizing both ways: the 50mm bore yields 982 N push at 0.5 MPa, while the neighbouring 40mm bore yields 628 N. If your application requires load holding on air loss, note that the standard cushion only decelerates the piston and does not lock it; you should use an external pilot check valve or choose the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX75
- ✓ 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 SI50BX75 FAQ
Yes, the SI50BX75 is discontinued. The direct replacement is the SAI50BX75. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 75mm stroke, G1/4 port, and mounting interface, so it drops directly into existing fixtures.
This double-acting cylinder operates at 30-800 mm/s with a G1/4 port and M16x1.5 rod thread. The force ratings are: 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.
Request a Quote for the SAI50BX75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX75 replacement — usually within 7-8 hours.