This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX700, 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 SI40BX700
The AirTAC Airtac SI40 Standard Cylinder SI40BX700 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 700mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX700, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX700
- 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 SI40BX700
The AirTAC SI40BX700 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 700 mm stroke. Featuring a SUS304 stainless piston rod, it delivers 628 N push force at 0.5 MPa. The direct replacement is the SAI40BX700, matching the interface, port and force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. For sensing, note this SKU lacks a magnet and cannot take a switch. The G1/4 port and 27 mm cushions are unchanged.
Airtac SI40 Standard Cylinder SI40BX700 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX700 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX700 |
| Bore size | Ø40 mm |
| Stroke | 700 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 SAI40BX700 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 SAI40BX700 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 SI40BX700
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×700 | 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 SI40BX700 Is Used
Long-Stroke Diversion
Pushes packages across a 700 mm conveyor lane using the 628 N push force at 0.5 MPa, guided externally to prevent rod bending.
Vertical Lowering
Lowers a 32 kg payload smoothly using the SUS304 stainless rod, requiring a pilot check valve to hold the load safely.
Corrosive Testing Rig
Actuates a 700 mm stroke test fixture in a humid environment, relying on the SUS304 rod material for corrosion resistance.
Replacing the Airtac SI40 Standard Cylinder SI40BX700 with the SAI40BX700
To replace this SI40BX700, order the SAI40BX700. Confirm the ISO 15552 mounting interface, 40 mm bore, 700 mm stroke, G1/4 port, and your specific mounting accessory. Because this is a 700 mm stroke, use external guides to prevent rod bending and side-load damage. This SKU has no magnet (-S), so it cannot accept CS1-B/DS1-B sensors. For load holding on air loss, add an external pilot check valve or rod lock, as the cushion only decelerates. If you need less force, the 32 mm bore offers 402 N; for more, the 50 mm bore provides 982 N at 0.5 MPa.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX700
- ✓ 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 SI40BX700 FAQ
Yes, the SI40BX700 is discontinued. The direct replacement is the SAI40BX700. It is dimensionally interchangeable per ISO 15552, offering the same 40 mm bore, 700 mm stroke, 628 N force, G1/4 port, and mounting interface.
The G1/4 port bore delivers push 628 N and pull 528 N at 0.5 MPa, push 879 N at 0.7 MPa, push 1130 N at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. The speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX700
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX700 replacement — usually within 7-8 hours.