This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX150SH, 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 SI40BX150SH
The AirTAC Airtac SI40 Standard Cylinder SI40BX150SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX150SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX150SH
- 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 SI40BX150SH
The AirTAC SI40BX150SH is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 150 mm stroke. It delivers 628 N push at 0.5 MPa via a G1/4 port and features a SUS304 stainless piston rod for corrosion resistance, a Viton H high-temperature seal rated for 0 to 150 C, and a piston magnet for legacy CS1-B/DS1-B sensors. AirTAC replaced this legacy unit with the SAI40BX150SH, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force and port size.
The SAI40BX150SH 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 the SI line lacked. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end.
Airtac SI40 Standard Cylinder SI40BX150SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX150SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX150SH |
| Bore size | Ø40 mm |
| Stroke | 150 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 SAI40BX150SH 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 SAI40BX150SH 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 SI40BX150SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 SI40BX150SH Is Used
Stainless Rod Clamping
Uses the SUS304 rod and 628 N force to secure parts in corrosive or washdown machining environments.
High-Temp Diverting
Viton H seals handle 0-150 C heat, making it ideal for routing products on hot pneumatic conveyor lines.
Replacing the Airtac SI40 Standard Cylinder SI40BX150SH with the SAI40BX150SH
To replace the SI40BX150SH, order the SAI40BX150SH. Confirm the ISO 15552 mounting interface, the 40 mm bore, the 150 mm stroke, the G1/4 port (PT/G/NPT), and your mounting accessory. The -S magnet enables current AirTAC switches, while the -B SUS304 rod and -H Viton seal carry over directly. Sizing both ways: this 40 mm bore gives 628 N push at 0.5 MPa; if undersized, a 50 mm bore yields 982 N. For load holding on air loss, the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 150 mm stroke, rod bending is low, but for any stroke over 300 mm add a guide to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX150SH
- ✓ 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 SI40BX150SH FAQ
Yes, the SI40BX150SH is discontinued. The direct replacement is the SAI40BX150SH. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 150 mm stroke, G1/4 port, and mounting interface, so it fits existing fixtures directly.
The G1/4 port feeds a 40 mm bore that generates 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 SAI40BX150SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX150SH replacement — usually within 7-8 hours.