This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX200, 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 SI40BX200
The AirTAC Airtac SI40 Standard Cylinder SI40BX200 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX200, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX200
- 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 SI40BX200
The AirTAC SI40BX200 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore, 200 mm stroke, Ø16 mm SUS304 stainless rod, and a G1/4 port. It delivers 628 N push force at 0.5 MPa. The direct replacement is the SAI40BX200, matching the ISO 15552 mounting interface, bore, stroke, output force, and port size exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor; the SI used CS1-B/DS1-B switches. The SAI family also adds SAIL, SAIF, and BSAI lock/valve variants.
Airtac SI40 Standard Cylinder SI40BX200 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX200 |
| Bore size | Ø40 mm |
| Stroke | 200 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 SAI40BX200 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 SAI40BX200 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 SI40BX200
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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 SI40BX200 Is Used
Stainless Rod Actuation
Drives medium-force tooling stages where the SUS304 rod resists washdown corrosion better than standard carbon steel.
Gated Stops
Acts as a 40 mm bore physical gate for workflow routing, easily swapping into existing ISO 15552 fixture holes.
Replacing the Airtac SI40 Standard Cylinder SI40BX200 with the SAI40BX200
To replace the SI40BX200, order the SAI40BX200. Verify your ISO 15552 mounting interface, 40 mm bore, 200 mm stroke, G1/4 port (PT/G/NPT), and SUS304 rod option. This non-magnet SKU cannot accept a sensor. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. For load holding, a plain cylinder drifts on air loss as the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 200 mm stroke, rod side-load bending is minimal, but ensure guide alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX200
- ✓ 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 SI40BX200 FAQ
Yes, the SI40BX200 is discontinued. The direct replacement is the SAI40BX200. It is dimensionally interchangeable per ISO 15552, keeping the same 40 mm bore, 200 mm stroke, 628 N force, G1/4 port, and mounting interface.
It has a G1/4 air port. The thrust ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX200 replacement — usually within 7-8 hours.