This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100X400S, 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 SI100 Standard Cylinder SI100X400S
The AirTAC Airtac SI100 Standard Cylinder SI100X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100X400S
- 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 SI100 Standard Cylinder SI100X400S
The AirTAC SI100X400S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 400mm stroke, delivering 3927N push force at 0.5MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI100X400S, a direct upgrade retaining the exact mounting interface, bore, stroke, force and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF and BSAI lock variants absent in the SI line. The built-in magnet supports legacy CS1-B/DS1-B switches, while rod options include carbon steel, SUS420J2 or SUS304.
Airtac SI100 Standard Cylinder SI100X400S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100X400S |
| Bore size | Ø100 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100X400S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100X400S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | 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 SI100 Standard Cylinder SI100X400S Is Used
Heavy Press Staging
Ideal for positioning heavy metal blanks at press stations, utilizing the 3927N push force and 400mm travel to feed material precisely into the stamping die.
Pallet Reject Arm
Drives a robust rejection mechanism on high-throughput packaging lines, safely pushing overweight or misaligned pallets off the main conveyor track.
Mold Actuation Unit
Actuates large molding fixtures or heavy tooling bases where the 200kg vertical lift capacity and long 400mm stroke securely transition components between stages.
Replacing the Airtac SI100 Standard Cylinder SI100X400S with the SAI100X400S
To replace the SI100X400S, order the SAI100X400S and verify the ISO 15552 mounting interface, G1/2 port thread (PT/G/NPT) and the -S magnet for CS1-B/DS1-B sensors. The SAI family expands options with the SAIL air-released lock, SAIF integrated 4M valve and BSAI clamp-lock variants. For sizing, the 100mm bore yields 3927N push at 0.5MPa; dropping to an 80mm bore gives 2513N, while a 125mm bore provides 6136N. Note that a plain cylinder drifts without live air, as cushions only decelerate; use a pilot check valve or SAIL/BSAI lock to hold loads. With the 400mm stroke, prevent rod bending by using an external guide to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100X400S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100X400S FAQ
Yes, the SI100X400S is discontinued. The direct replacement is the SAI100X400S. It is dimensionally interchangeable per ISO 15552, matching the 100mm bore, 400mm stroke, 3927N force, G1/2 port and mounting accessories.
The 100mm bore uses a G1/2 port. At 0.5MPa it provides 3927N push and 3681N pull force. At 0.7MPa push is 5497N, and at 0.9MPa it is 7068N. The theoretical maximum force is 801kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100X400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100X400S replacement — usually within 7-8 hours.