This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X75TC, 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 SI40X75TC
The AirTAC Airtac SI40 Standard Cylinder SI40X75TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X75TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X75TC
- 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 SI40X75TC
The AirTAC SI40X75TC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. It delivers 628 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40X75TC, matching the TC trunnion mount, M12x1.25 rod thread, and output exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that a plain cylinder drifts without live air; the cushion only decelerates. Use the SAIL or BSAI lock variants if needed.
Airtac SI40 Standard Cylinder SI40X75TC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X75TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X75TC |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAI40X75TC 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 SAI40X75TC 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 SI40X75TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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 SI40 Standard Cylinder SI40X75TC Is Used
Component Clamping
Secures mid-weight machined parts during milling or drilling, utilizing the 628 N push force to hold firmly against cutting vibration.
Package Diverting
Actuates a 75mm stroke diverting arm on a packaging line to route boxes, taking advantage of the compact ISO 15552 profile barrel.
Gate Operation
Opens and closes lightweight access gates on automated storage shelving, with the TC trunnion handling pivot stresses smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40X75TC with the SAI40X75TC
To replace the SI40X75TC, order the SAI40X75TC. Confirm the ISO 15552 TC trunnion interface, 40mm bore, 75mm stroke, G1/4 port (PT/G/NPT), and M12x1.25 rod thread. Because this SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. If sizing up, the 50mm bore yields 982 N push at 0.5 MPa; sizing down, the 32mm bore yields 402 N. For load holding on air loss, add an external pilot check valve or use the SAIL/BSAI lock variants, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X75TC
- ✓ 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 SI40X75TC FAQ
Yes, the AirTAC SI40X75TC is discontinued. The direct replacement is the SAI40X75TC. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 75mm stroke, G1/4 port, and TC trunnion mounting interface.
The bore is 40mm with a G1/4 air port. Force output is 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 piston rod is 16mm with an M12x1.25 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X75TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X75TC replacement — usually within 7-8 hours.