This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX530S, 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 SI40BX530S
The AirTAC Airtac SI40 Standard Cylinder SI40BX530S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 530mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX530S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke530 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX530S
- 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 SI40BX530S
The AirTAC SI40BX530S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 530mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40BX530S, retaining the exact interface, stroke, and force. This unit features a SUS304 stainless rod (-B) and a piston magnet (-S) for CS1-B/DS1-B sensors.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants. Note that air cushions only decelerate; they do not hold loads.
Airtac SI40 Standard Cylinder SI40BX530S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX530S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX530S |
| Bore size | Ø40 mm |
| Stroke | 530 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 SAI40BX530S 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 SAI40BX530S 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 SI40BX530S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×530 | 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 SI40BX530S Is Used
Diverting Mechanisms
Drives diverter arms on packaging lines where the 530mm stroke shifts products between parallel belts, utilizing the 628N push force at 0.5MPa.
Vertical Lift Gates
Raises lightweight access gates or safety barriers. The SUS304 rod resists humidity, and the 32kg vertical lift capacity handles typical gate weights.
Pneumatic Indexing
Moves sliding carriages between processing stations. The 530mm travel requires external linear guides to prevent side-load wear on the piston rod.
Replacing the Airtac SI40 Standard Cylinder SI40BX530S with the SAI40BX530S
To replace the SI40BX530S, order the SAI40BX530S, confirming the ISO 15552 mounting interface, 40mm bore, 530mm stroke, G1/4 port, and mounting accessories. The -B rod is SUS304 stainless steel, and the -S magnet works with legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing, a 32mm bore offers 402N push at 0.5MPa, while a 50mm bore offers 982N. At 530mm stroke, prevent rod bending by guiding the load externally. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX530S
- ✓ 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 SI40BX530S FAQ
Yes, the SI40BX530S is discontinued. The direct replacement is the SAI40BX530S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 530mm stroke, 628N force, G1/4 port, and mounting interface.
This 40mm bore cylinder has a G1/4 air port. The thrust 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX530S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX530S replacement — usually within 7-8 hours.