This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X100H, 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 SI40X100H
The AirTAC SI40 Standard Cylinder SI40X100H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X100H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X100H
- 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 SI40X100H
The AirTAC SI40X100H is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 100mm stroke, G1/4 port and a Viton H high-temperature seal (0-150 C). It delivers 628 N push force at 0.5 MPa. The direct replacement is the SAI40X100H, which shares the exact ISO 15552 mounting interface, bore, stroke, output force and porting for seamless fixture integration.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this specific SKU lacks a magnet (-S), it cannot accept a sensor; the SI family used CS1-B/DS1-B switches, while the SAI family uses current AirTAC sensors. The SAI line also introduces SAIL, SAIF and BSAI variants absent from the SI range.
Airtac SI40 Standard Cylinder SI40X100H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X100H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X100H |
| Bore size | Ø40 mm |
| Stroke | 100 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 SAI40X100H 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 SAI40X100H 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 SI40X100H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 SI40X100H Is Used
Hot Stamp Ejection
Uses the Viton H seal to withstand radiant heat while pushing finished stamped parts out of a heated die with 628 N at 0.5 MPa.
Divert Gate Actuation
Cycles a lightweight routing flap on a packaging line, where the 100mm stroke and 30-800 mm/s speed provide rapid sorting.
Small Carton Stopping
Acts as a pneumatic stop for medium cartons on a gravity roller conveyor, safely arresting loads under the 377 N working limit.
Replacing the Airtac SI40 Standard Cylinder SI40X100H with the SAI40X100H
To replace the SI40X100H, order the SAI40X100H to retain the exact 40mm bore, 100mm stroke, G1/4 port and ISO 15552 mounting interface. Confirm your mounting accessory (LB, FA, TC, etc.) and note that this no-S SKU cannot take a magnetic sensor. The Viton H seal provides 0-150 C heat resistance. Sizing both ways: a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For this 100mm stroke, side-load is minimal, but ensure rod alignment to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X100H
- ✓ 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 SI40X100H FAQ
Yes, the SI40X100H is discontinued. The direct replacement is the SAI40X100H. It is dimensionally interchangeable per ISO 15552, maintaining the same 40mm bore, 100mm stroke, G1/4 port and mounting interface.
The G1/4 port supplies a push force of 628 N and pull of 528 N at 0.5 MPa. At 0.7 MPa push is 879 N, at 0.9 MPa it is 1130 N, and the theoretical max is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X100H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X100H replacement — usually within 7-8 hours.