This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX75TC, 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 SI50BX75TC
The AirTAC Airtac SI50 Standard Cylinder SI50BX75TC 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 SAI50BX75TC, 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 → SAI50BX75TC
- 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 SI50BX75TC
The AirTAC SI50BX75TC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50BX75TC, a direct upgrade retaining the exact TC trunnion mount, M16x1.5 rod thread, and 30mm cushions.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. The -B rod specifies SUS304 stainless steel for corrosion resistance.
Airtac SI50 Standard Cylinder SI50BX75TC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX75TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX75TC |
| 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 SAI50BX75TC 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 SAI50BX75TC 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 SI50BX75TC
| 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 SI50BX75TC Is Used
Package Diversion
Drives a 75mm stroke diverter arm on a packaging line, utilizing the 982N push force at 0.5MPa to redirect cartons reliably without needing sensing.
Clamp Actuation
Provides repeatable clamping on a machining fixture where the SUS304 stainless rod resists coolant corrosion, and the TC mount handles pivot stresses.
Gate Control
Operates a 50kg gravity-feed gate in a distribution center, safely within the 589N working load limit and 50kg vertical lift capacity.
Replacing the Airtac SI50 Standard Cylinder SI50BX75TC with the SAI50BX75TC
To replace the SI50BX75TC, order the SAI50BX75TC and verify the ISO 15552 TC trunnion interface, 75mm stroke, G1/4 port, and SUS304 (-B) rod. This non-magnetic SKU cannot hold a position switch. If sensing is required, select an SAI model with the S suffix. For sizing, the 50mm bore yields 982N push at 0.5MPa; stepping down to 40mm drops force to 628N, while 63mm increases it to 1559N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants. The SAI family also adds the SAIF self-valve option (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX75TC
- ✓ 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 SI50BX75TC FAQ
Yes, the SI50BX75TC is discontinued. The direct replacement is the SAI50BX75TC. It shares the same ISO 15552 mounting interface, 50mm bore, 75mm stroke, G1/4 port, and TC trunnion mount, but features an upgraded two Y-shaped element piston seal for lower start-up pressure.
The 50mm bore uses a G1/4 air port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa. It operates at 30-800mm/s with a 20mm rod and M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX75TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX75TC replacement — usually within 7-8 hours.