This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X500SH, 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 SI125X500SH
The AirTAC SI125 Standard Cylinder SI125X500SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X500SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X500SH
- 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 SI125X500SH
The AirTAC SI125X500SH is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 500 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X500SH, matching the interface, force, and stroke.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. This -S and -H configured unit includes a magnet for CS1-B/DS1-B sensors and Viton seals for 0-150 C heat.
Airtac SI125 Standard Cylinder SI125X500SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X500SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X500SH |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125X500SH 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 SAI125X500SH 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 SI125X500SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SI125X500SH Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring 6136 N push force at 0.5 MPa over a 500 mm travel distance.
High-Tact Forming
Ideal for high-temperature forming jigs up to 150 C, leveraging the Viton H seal and robust 125 mm profile barrel.
Pallet Diversion
Shifts heavy pallets on assembly lines, utilizing the 500 mm stroke to clear large workpieces safely.
Replacing the Airtac SI125 Standard Cylinder SI125X500SH with the SAI125X500SH
To replace the SI125X500SH, order the SAI125X500SH. Verify the ISO 15552 mounting interface, G1/2 port, M27x2 rod thread, and the -S magnet / -H Viton high-temp seal. The 500 mm stroke requires external guides to prevent rod bending under side loads. Neighbouring bores: a 100 mm bore gives 3927 N push @0.5 MPa, while a 160 mm bore yields 10053 N. For load holding on air loss, note that cushions only decelerate; use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X500SH
- ✓ 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 SI125X500SH FAQ
Yes, the AirTAC SI125X500SH is discontinued. The direct replacement is the SAI125X500SH. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 500 mm stroke, G1/2 port, and mounting interface.
The bore is 125 mm with a G1/2 air port and M27x2 rod thread. Forces are: push 6136 N and pull 5734 N at 0.5 MPa; push 8590 N at 0.7 MPa; push 11045 N at 0.9 MPa; theoretical max 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X500SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X500SH replacement — usually within 7-8 hours.