This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX135, 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 SI40BX135
The AirTAC SI40 Standard Cylinder SI40BX135 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 135mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX135, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX135
- 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 SI40BX135
The AirTAC SI40BX135 is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 135mm stroke, and a SUS304 stainless piston rod. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40BX135. This direct upgrade matches the G1/4 port, M12x1.25 thread, and mounting interface.
The SAI upgrade features two Y-shaped piston seals for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40BX135 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX135 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX135 |
| Bore size | Ø40 mm |
| Stroke | 135 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 SAI40BX135 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 SAI40BX135 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 SI40BX135
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SI40BX135 Is Used
Washdown Clamping
The SUS304 stainless rod resists corrosion, making it ideal for clamping parts in food or chemical washdown environments.
Package Diverting
Provides reliable 628N push force to actuate diverters or gates on packaging lines at speeds up to 800mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40BX135 with the SAI40BX135
To replace the SI40BX135, order the SAI40BX135. Verify the ISO 15552 interface, 40mm bore, 135mm stroke, G1/4 port, and SUS304 rod (-B). Because this SKU lacks a magnet (-S), it cannot accept a CS1-B/DS1-B sensor. If sizing alternatives, a 32mm bore yields 402N push, while a 50mm bore yields 982N at 0.5MPa. For loads needing holding on air loss, the cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variant. At 135mm stroke, side-load is minimal, but ensure front mounting alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX135
- ✓ 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 SI40BX135 FAQ
Yes, the SI40BX135 is discontinued. The direct replacement is the SAI40BX135, which shares the same ISO 15552 mounting interface, 40mm bore, 135mm stroke, G1/4 port, and output force.
It features a G1/4 air port. Force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX135
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX135 replacement — usually within 7-8 hours.