This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX35S, 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 SI100 Standard Cylinder SI100BX35S
The AirTAC Airtac SI100 Standard Cylinder SI100BX35S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 35mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX35S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX35S
- 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 SI100 Standard Cylinder SI100BX35S
The AirTAC SI100BX35S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 35mm stroke. It features a SUS304 stainless steel rod, a built-in piston magnet, and delivers 3927 N push force at 0.5 MPa. The direct replacement is the SAI100BX35S, which maintains the exact same G1/2 port, M20x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note that a plain cylinder drifts without live air; use the SAIL lock or BSAI clamp-lock variants for load holding.
Airtac SI100 Standard Cylinder SI100BX35S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX35S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX35S |
| Bore size | Ø100 mm |
| Stroke | 35 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI100BX35S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The SAI100BX35S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI100 Standard Cylinder SI100BX35S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×35 | 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 SI100 Standard Cylinder SI100BX35S Is Used
High-Force Clamping
Delivers 3927 N at 0.5 MPa to secure heavy steel plates during machining, using the SUS304 rod in coolant-rich environments.
Short-Stroke Pressing
The 35mm stroke provides rapid, high-impact pressing for bearing insertion and pin seating tasks on automated assembly lines.
Chemical Resistance
The SUS304 stainless rod option makes this 100mm bore cylinder suitable for packaging and processing equipment exposed to wash-downs.
Replacing the Airtac SI100 Standard Cylinder SI100BX35S with the SAI100BX35S
To replace the SI100BX35S, order the SAI100BX35S. Verify the ISO 15552 mounting interface, 100mm bore, 35mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B sensors. The -B rod is SUS304 stainless steel, ideal for corrosive environments compared to the standard carbon steel. If sizing alternatives, neighboring bores (80mm or 125mm) change the 0.5 MPa push force (2513 N or 6136 N respectively). Because this is a short 35mm stroke, side-load and rod-bending risks are minimal. For applications requiring the cylinder to hold a load on air loss, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX35S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI100 Standard Cylinder SI100BX35S FAQ
Yes, the SI100BX35S is discontinued. The direct replacement is the SAI100BX35S. It is dimensionally interchangeable per ISO 15552, keeping the same 100mm bore, 35mm stroke, G1/2 port, and mounting fixtures.
It features a G1/2 port. The force ratings are: 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical max of 801 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX35S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX35S replacement — usually within 7-8 hours.