This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX100S, 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 SI50BX100S
The AirTAC SI50 Standard Cylinder SI50BX100S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX100S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX100S
- 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 SI50BX100S
The AirTAC SI50BX100S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 100mm stroke. It features a SUS304 stainless piston rod (-B) and a built-in magnet (-S) for legacy CS1-B/DS1-B switches. Delivering 982 N push force at 0.5 MPa, the direct replacement is the SAI50BX100S, sharing the same G1/4 port, M16x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. Note that a plain cylinder drifts without live air; use a pilot check valve for load holding.
Airtac SI50 Standard Cylinder SI50BX100S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX100S |
| Bore size | Ø50 mm |
| Stroke | 100 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 SAI50BX100S 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 SAI50BX100S 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 SI50BX100S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×100 | 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 SI50BX100S Is Used
Stainless Rod Diverters
Ideal for food or washdown conveyor lines where the SUS304 rod resists moisture while pushing 982 N packages at 0.5 MPa.
Pneumatic Clamping Arms
Holds workpieces securely in machining fixtures, relying on the 30mm adjustable air cushions to decelerate the 50mm bore at stroke ends.
Replacing the Airtac SI50 Standard Cylinder SI50BX100S with the SAI50BX100S
To replace the SI50BX100S, order the SAI50BX100S to retain the exact 50mm bore, 100mm stroke, G1/4 port, and ISO 15552 mounting dimensions. Confirm your thread standard (PT/G/NPT) and mounting accessory (LB, FA, TC, etc.). The -B suffix specifies the SUS304 rod for corrosion resistance, while -S ensures magnet compatibility with CS1-B/DS1-B switches (the SAI uses current AirTAC switches). If sizing up or down, neighbouring bores are 40mm (628 N push @0.5 MPa) and 63mm (1559 N push @0.5 MPa). Because a standard cylinder lacks a brake, the air cushion only decelerates; for load holding on air loss, specify an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX100S
- ✓ 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 SI50BX100S FAQ
Yes, the AirTAC SI50BX100S is discontinued. The direct replacement is the SAI50BX100S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 100mm stroke, G1/4 port, and mounting interface to fit existing fixtures.
The 50mm bore features a G1/4 air port and an M16x1.5 rod thread. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, with a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX100S replacement — usually within 7-8 hours.