This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX220, 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 SI40BX220
The AirTAC Airtac SI40 Standard Cylinder SI40BX220 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 220mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX220, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke220 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX220
- 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 SI40BX220
The AirTAC SI40BX220 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 220 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40BX220, matching the interface, force, and mounting exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This specific SKU uses a SUS304 stainless steel rod (B option) for corrosion resistance, but lacks a magnet so it cannot take a sensor. Note that plain cylinders drift without live air; use an external rod lock or SAIL/BSAI variant for load holding.
Airtac SI40 Standard Cylinder SI40BX220 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX220 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX220 |
| Bore size | Ø40 mm |
| Stroke | 220 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 SAI40BX220 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 SAI40BX220 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 SI40BX220
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×220 | 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 SI40BX220 Is Used
Bottle Line Diversion
Pushes light product streams on packaging lines using a 628 N push force, with the SUS304 rod resisting washdown moisture.
Pallet Stop Gate
Acts as a 220 mm stroke stop gate for low-weight pallets, safely halting loads under the 377 N safe working threshold.
Lab Test Fixture
Provides repeatable clamping on test rigs, where the non-magnetic design is acceptable and ISO 15552 dimensions ease fixture mounting.
Replacing the Airtac SI40 Standard Cylinder SI40BX220 with the SAI40BX220
To replace the SI40BX220, order the SAI40BX220. Confirm the ISO 15552 mounting interface, 40 mm bore, 220 mm stroke, G1/4 port, and your specific mounting accessory. Because this SKU lacks a magnet (-S), it cannot accept a CS1-B/DS1-B sensor. If sensing is required, switch to an SAI40X220S. The SUS304 stainless rod is retained. Sizing both ways: a 50 mm bore gives 982 N push at 0.5 MPa, while a 32 mm bore yields 402 N. At 220 mm stroke, guide side-loads to prevent rod bending. For held loads, use a pilot check valve or SAIL/BSAI lock variant, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX220
- ✓ 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 SI40BX220 FAQ
Yes, the SI40BX220 is discontinued. The direct replacement is the SAI40BX220. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 220 mm stroke, 628 N force, G1/4 port, and mounting interface.
The G1/4 port bore delivers 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. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX220
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX220 replacement — usually within 7-8 hours.