This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X75STC, 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 SI63 Standard Cylinder SI63X75STC
The AirTAC Airtac SI63 Standard Cylinder SI63X75STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 75mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X75STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke75 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X75STC
- 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 SI63 Standard Cylinder SI63X75STC
The AirTAC SI63X75STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 75mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X75STC, sharing identical ISO 15552 mounting dimensions, output force, and TC trunnion interface.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. For applications needing load holding on air loss, the SAI family introduces SAIL and BSAI lock variants absent in the SI line. With the -S magnet, this cylinder pairs with CS1-B/DS1-B switches.
Airtac SI63 Standard Cylinder SI63X75STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X75STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X75STC |
| Bore size | Ø63 mm |
| Stroke | 75 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X75STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63X75STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X75STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | 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 SI63 Standard Cylinder SI63X75STC Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in machining fixtures using its 1559N push force at 0.5MPa, ensuring rigid holding during milling or drilling operations.
Pallet Diverting
Actuates TC trunnion-mounted diverters on packaging lines, providing reliable 75mm stroke actuation to redirect heavy goods at high speeds.
Replacing the Airtac SI63 Standard Cylinder SI63X75STC with the SAI63X75STC
To replace the SI63X75STC, order the SAI63X75STC. Confirm the ISO 15552 TC trunnion mounting, 63mm bore, 75mm stroke, G3/8 port, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If you need more force, the neighbouring 80mm bore yields 2513N push at 0.5MPa; if less is required, the 50mm bore provides 982N. Remember that a standard cylinder drifts without live air, as cushions only decelerate. For load holding, explore the SAIL or BSAI lock variants, or use an external pilot check valve. Rod material options include carbon steel, SUS420J2 (A), or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X75STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X75STC FAQ
Yes, the AirTAC SI63X75STC is discontinued. The direct replacement is the SAI63X75STC. It is dimensionally interchangeable per ISO 15552, maintaining the same 63mm bore, 75mm stroke, G3/8 port, TC mounting, and output force.
The 63mm bore delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318 kgf at 1.0MPa. Operating speed is 30-800 mm/s, with a 30mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X75STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X75STC replacement — usually within 7-8 hours.