This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI100BX135S, 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 SI100BX135S
The AirTAC Airtac SI100 Standard Cylinder SI100BX135S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 135mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI100BX135S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI100BX135S
- 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 SI100BX135S
The AirTAC SI100BX135S is a discontinued double-acting ISO 15552 profile cylinder with a 100mm bore and 135mm stroke. Delivering 3927N push force at 0.5MPa, it features a SUS304 stainless piston rod (-B), a built-in magnet (-S) for CS1-B/DS1-B sensors, and a G1/2 air port. AirTAC replaced this legacy unit with the SAI100BX135S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI100BX135S introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. A plain cylinder drifts on air loss; the cushion only decelerates.
Airtac SI100 Standard Cylinder SI100BX135S Technical Specifications
| Model | Airtac SI100 Standard Cylinder SI100BX135S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI100BX135S |
| Bore size | Ø100 mm |
| Stroke | 135 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 SAI100BX135S 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 SAI100BX135S 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 SI100BX135S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | 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 SI100 Standard Cylinder SI100BX135S Is Used
Heavy-Duty Pressing
Drives 3927N of push force at 0.5MPa for seating bearings and assembling large components in automated machinery.
Corrosive Environments
The SUS304 stainless rod (-B) excels in humid or washdown processing plants requiring reliable 100mm bore actuation.
Replacing the Airtac SI100 Standard Cylinder SI100BX135S with the SAI100BX135S
To replace the SI100BX135S, order the SAI100BX135S. Confirm the ISO 15552 mounting interface, 100mm bore, 135mm stroke, G1/2 port (PT/G/NPT threads), and mounting accessory. The -B suffix denotes the SUS304 rod, and -S means the magnet is present for legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). For sizing both ways, neighbouring bores are 80mm and 125mm; at 0.5MPa this 100mm bore yields 3927N push and 3681N pull. Because a standard cylinder does not hold load without live air, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for holding. At 135mm stroke, side-load is minimal, but always guide the load to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI100BX135S
- ✓ 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 SI100BX135S FAQ
Yes, the SI100BX135S is discontinued. The direct replacement is the SAI100BX135S. It shares the same ISO 15552 mounting interface, 100mm bore, 135mm stroke, force, G1/2 port, and mounting accessories, fitting existing fixtures perfectly.
It has a G1/2 air port. Force ratings are 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa. It operates at 30-800mm/s with a 36mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI100BX135S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI100BX135S replacement — usually within 7-8 hours.