This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX140, 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 SI50AX140
The AirTAC Airtac SI50 Standard Cylinder SI50AX140 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 140mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX140, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX140
- 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 SI50AX140
The AirTAC SI50AX140 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 140 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50AX140, which shares the same interface, bore, stroke, force, and mounting.
This SKU features a SUS420J2 stainless piston rod (the -A option) for corrosion resistance. It lacks a magnet, so it cannot accept a sensor. The SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure.
Airtac SI50 Standard Cylinder SI50AX140 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX140 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX140 |
| Bore size | Ø50 mm |
| Stroke | 140 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 SAI50AX140 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 SAI50AX140 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 SI50AX140
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×140 | 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 SI50AX140 Is Used
Stainless Rod Actuation
Ideal for moderate-wear environments where the SUS420J2 stainless rod prevents corrosion while pushing 982 N at 0.5 MPa.
Package Diversion
Provides reliable 140 mm stroke diverting force on packaging lines, operating smoothly at 30-800 mm/s.
Replacing the Airtac SI50 Standard Cylinder SI50AX140 with the SAI50AX140
To replace the SI50AX140, order the SAI50AX140. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this specific SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if position feedback is required. The SAI family also adds SAIL, SAIF, and BSAI variants for locking and integrated valve needs. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL lock for held loads. For sizing flexibility, a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore provides 1559 N. At 140 mm stroke, side-load risks are low, but always guide the load to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX140
- ✓ 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 SI50AX140 FAQ
Yes, the AirTAC SI50AX140 is discontinued. The direct replacement is the SAI50AX140. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 140 mm stroke, G1/4 port, and mounting interface to fit existing fixtures directly.
This double-acting cylinder uses a G1/4 air port. It delivers a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa the push force is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX140
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX140 replacement — usually within 7-8 hours.