This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100SH, 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 SI125 Standard Cylinder SI125X100SH
The AirTAC SI125 Standard Cylinder SI125X100SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X100SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X100SH
- 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 SI125 Standard Cylinder SI125X100SH
The AirTAC SI125X100SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 100 mm stroke. It delivers a robust 6136 N push force at 0.5 MPa and includes a -S magnet for legacy CS1-B/DS1-B sensors. The direct replacement is the current-production SAI125X100SH, which maintains the exact same ISO 15552 mounting interface, G1/2 port size, and output force. This SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and extended life.
The -H designation indicates a Viton H seal option, expanding the operating temperature range from -20 to +70 C up to 0-150 C. Note that a standard cylinder does not hold load without live air; for secure holding, consider the SAIL air-released lock or BSAI clamp-lock variants that the legacy SI line lacked.
Airtac SI125 Standard Cylinder SI125X100SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100SH |
| Bore size | Ø125 mm |
| Stroke | 100 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X100SH carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125X100SH produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X100SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125 Standard Cylinder SI125X100SH Is Used
Heavy Stamping Press
Drives heavy-duty stamping and forming dies requiring high thrust, utilizing the 6136 N push force at 0.5 MPa.
Injection Mold Clamping
Secures large injection mold halves, relying on the rigid ISO 15552 profile barrel for stable alignment.
Replacing the Airtac SI125 Standard Cylinder SI125X100SH with the SAI125X100SH
To replace the discontinued SI125X100SH, order the SAI125X100SH direct equivalent, verifying the ISO 15552 mounting interface, 125 mm bore, 100 mm stroke, and G1/2 port (PT/G/NPT thread options). Confirm your mounting accessory (LB, FA, TC, etc.) and retain the -S magnet for current AirTAC switch compatibility. For force sizing, this bore provides 6136 N push at 0.5 MPa; if lower force is acceptable, the neighbouring 100 mm bore yields 3927 N, while the 160 mm bore offers 10053 N for heavier demands. Because the stroke is 100 mm, side-load and rod-bending stresses are minimal, but always ensure proper guide alignment. A plain cylinder drifts without live air, so for load-holding applications integrate an external pilot check valve or specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100SH
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X100SH FAQ
Yes, the SI125X100SH is discontinued. The direct replacement is the SAI125X100SH. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 100 mm stroke, output force, G1/2 port, and mounting interface to fit existing fixtures directly.
The 125 mm bore features a G1/2 air port and an M27x2 rod thread. Force output is 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, with a theoretical maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X100SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100SH replacement — usually within 7-8 hours.