This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX600S, 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 SI40BX600S
The AirTAC Airtac SI40 Standard Cylinder SI40BX600S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX600S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX600S
- 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 SI40BX600S
The AirTAC SI40BX600S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 600mm stroke, and a SUS304 stainless steel rod. It delivers 628N push force at 0.5MPa. The direct replacement is the SAI40BX600S, matching the G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The -S magnet works with legacy CS1-B/DS1-B sensors, while SAI adds SAIL lock and SAIF valve variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX600S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX600S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX600S |
| Bore size | Ø40 mm |
| Stroke | 600 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 SAI40BX600S 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 SAI40BX600S 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 SI40BX600S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×600 | 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 SI40BX600S Is Used
Long-Stroke Diversion
Pushes packages across a 600mm transfer belt using the 628N push force, with the SUS304 rod enduring washdown environments.
Elevated Lowering
Lowers 32kg assemblies over 600mm; requires external guides to prevent rod bending and a pilot check valve to hold the load.
Stainless Actuation
Actuates corrosive fluid sampling valves where the SUS304 rod prevents degradation, switching flows via the G1/4 port.
Replacing the Airtac SI40 Standard Cylinder SI40BX600S with the SAI40BX600S
To replace the SI40BX600S, order the SAI40BX600S. Confirm the ISO 15552 mounting interface, the G1/4 port, the M12x1.25 rod thread, and the -S magnet for current AirTAC switches. The SUS304 rod suits corrosive environments. For sizing, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note: a 600mm stroke risks rod bending; use external guides to prevent side loads. This plain cylinder drifts on air loss—use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX600S
- ✓ 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 SI40BX600S FAQ
Yes, the SI40BX600S is discontinued. The direct replacement is the SAI40BX600S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 600mm stroke, 628N force, G1/4 port, and mounting fixtures.
The bore is 40mm with a G1/4 air port. At 0.5MPa it pushes 628N and pulls 528N. At 0.7MPa push is 879N, at 0.9MPa it is 1130N, and the theoretical max is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX600S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX600S replacement — usually within 7-8 hours.