This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X700STC, 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 SI40 Standard Cylinder SI40X700STC
The AirTAC Airtac SI40 Standard Cylinder SI40X700STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 700mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X700STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X700STC
- 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 SI40 Standard Cylinder SI40X700STC
The AirTAC SI40X700STC is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 700 mm stroke. It delivers 628 N push at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40X700STC, matching the interface, force, and TC trunnion mount exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X700STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X700STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X700STC |
| Bore size | Ø40 mm |
| Stroke | 700 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X700STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40X700STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X700STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×700 | 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 SI40 Standard Cylinder SI40X700STC Is Used
Long-Stroke Diversion
Pushes packages across a 700 mm conveyor lane using the 628 N thrust, with the TC trunnion accommodating structural flex.
Pneumatic Escapement
Actuates a 700 mm parts separator shuttle, where the G1/4 port and 30-800 mm/s speed range maintain consistent cycle times.
Replacing the Airtac SI40 Standard Cylinder SI40X700STC with the SAI40X700STC
To replace the SI40X700STC, order the SAI40X700STC. Verify the ISO 15552 TC trunnion interface, 40 mm bore, 700 mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B switches. For sizing, a 32 mm bore yields 402 N push, while a 50 mm bore yields 982 N at 0.5 MPa. Because this is a 700 mm stroke, use an external guide to prevent rod bending and side loads. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X700STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X700STC FAQ
Yes, the SI40X700STC is discontinued. The direct replacement is the SAI40X700STC. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 700 mm stroke, G1/4 port, and TC trunnion mounting interface.
The G1/4 port feeds a 40 mm bore that generates 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. The rod is 16 mm with an M12x1.25 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X700STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X700STC replacement — usually within 7-8 hours.