This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X400TC, 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 SI40X400TC
The AirTAC Airtac SI40 Standard Cylinder SI40X400TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X400TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X400TC
- 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 SI40X400TC
The AirTAC SI40X400TC is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 400 mm stroke. It delivers 628 N push force at 0.5 MPa and features a G1/4 port. AirTAC replaced this legacy unit with the SAI40X400TC, a direct upgrade retaining the exact TC trunnion mounting interface, bore, stroke and output force.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Note this SKU lacks a magnet and cannot accept sensors; legacy CS1-B/DS1-B switches only fit the -S variant.
Airtac SI40 Standard Cylinder SI40X400TC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X400TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X400TC |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAI40X400TC 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 SAI40X400TC 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 SI40X400TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SI40X400TC Is Used
Material Diversion
Drives 400 mm stroke diverters on packaging lines, providing 628 N push at 0.5 MPa to redirect medium-weight cartons reliably.
Pallet Push-Off
Actuates a push-off mechanism to transfer goods, using the TC trunnion mount to accommodate pivot articulation during the long 400 mm travel.
Replacing the Airtac SI40 Standard Cylinder SI40X400TC with the SAI40X400TC
To replace the SI40X400TC, order the SAI40X400TC. Confirm the ISO 15552 TC trunnion interface, 40 mm bore, 400 mm stroke, G1/4 port (PT/G/NPT thread options) and the double-acting operation. Because this SKU lacks the -S magnet, it cannot support position sensing; switch to an SAI40X400TCS if a sensor is required. Sizing both ways: the 40 mm bore yields 628 N push at 0.5 MPa, while the neighbouring 50 mm bore provides 982 N if more force is needed. For the 400 mm stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X400TC
- ✓ 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 SI40X400TC FAQ
Yes, the AirTAC SI40X400TC is discontinued. The direct replacement is the SAI40X400TC. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 400 mm stroke, G1/4 port, TC trunnion mount and output force, so it fits existing fixtures directly.
The 40 mm bore features a G1/4 air port and a 16 mm rod. It delivers 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 maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X400TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X400TC replacement — usually within 7-8 hours.