This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX200N, 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 SI40BX200N
The AirTAC Airtac SI40 Standard Cylinder SI40BX200N 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 SAI40BX200N, 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 → SAI40BX200N
- 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 SI40BX200N
The AirTAC SI40BX200N is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 200mm stroke. Featuring a SUS304 stainless steel rod and NBR seals, it delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40BX200N, matching the interface, force, and mounting exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that this no-magnet SKU cannot accept a sensor, and the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX200N Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX200N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX200N |
| 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 SAI40BX200N 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 SAI40BX200N 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 SI40BX200N
| 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 SI40BX200N Is Used
Stainless Rod Diverters
Ideal for diverting light packages on food-grade lines where the SUS304 rod resists washdown chemicals and the 628N thrust handles side transfers.
Corrosive Environment Chucks
Operates small pneumatic chucks in humid or mildly corrosive settings, using the stainless piston rod to maintain clamping integrity without rusting.
Replacing the Airtac SI40 Standard Cylinder SI40BX200N with the SAI40BX200N
To replace the SI40BX200N, order the SAI40BX200N. Confirm the ISO 15552 mounting interface, 40mm bore, 200mm stroke, G1/4 port, and NBR seals. The SUS304 rod provides corrosion resistance. Because this SKU lacks a magnet (-S), it cannot support CS1-B/DS1-B sensors. If sizing up or down, neighboring bores are 32mm (402N push at 0.5MPa) and 50mm (982N push). For stroke lengths at or above 300mm, use a guide to prevent rod bending and side-load wear. The air cushion only decelerates the piston; it does not hold the load. If you need load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX200N
- ✓ 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 SI40BX200N FAQ
Yes, the AirTAC SI40BX200N is discontinued. The direct replacement is the SAI40BX200N. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 200mm stroke, G1/4 port, and mounting interface. The SAI features an upgraded piston seal for lower start-up pressure.
This 40mm bore cylinder uses a G1/4 air port. The force ratings are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. It operates at speeds of 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX200N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX200N replacement — usually within 7-8 hours.