This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ63X75-50STC, 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC
The AirTAC SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC 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 SAIJ63X75-50STC, 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 → SAIJ63X75-50STC
- 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC
The AirTAC SIJ63X75-50STC is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 25-75 mm extension from the 75 mm nominal maximum.
This SIJ model is replaced by the SAIJ63X75-50STC direct, retaining the ISO 15552 mounting interface, TC mount, force, and adjust window. The SAIJ upgrade features a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The stop screw sets end position only; it is not a load lock.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC Technical Specifications
| Model | Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ63X75-50STC |
| 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 SAIJ63X75-50STC 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 SAIJ63X75-50STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC
| 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC Is Used
Variable Stroke Clamping
Adjusts the extend stop on-site to clamp parts of varying heights without repositioning the entire fixture.
Sorting Diverter Gate
Tunes the extend stroke length precisely to route different package sizes on a packaging line.
Adjustable End Stops
Allows field adjustment of the extend end position for changing pallet dimensions without swapping cylinders.
Replacing the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC with the SAIJ63X75-50STC
To replace the discontinued SIJ63X75-50STC, order the exact direct replacement SAIJ63X75-50STC to keep the 63 mm bore, 75 mm stroke, 50 mm adjust window, G3/8 port, and TC mounting. Choose the 50 mm adjust window if you need to trim the extend stroke on-site from 75 mm down to 25 mm. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B switches. Retain the TC center mount. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ63X75-50STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X75-50STC FAQ
Yes, the SIJ63X75-50STC is discontinued. The direct replacement is the SAIJ63X75-50STC, which shares the same ISO 15552 interface, 63 mm bore, 75 mm stroke, 50 mm adjust window, G3/8 port, and TC mounting.
The external stop screw provides a 50 mm adjust window, allowing you to trim the 75 mm nominal extend stroke down to 25 mm. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ63X75-50STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ63X75-50STC replacement — usually within 7-8 hours.