This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X20S, 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 SID Series Double-Rod Cylinder SID125X20S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 20mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X20S
- 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 SID Series Double-Rod Cylinder SID125X20S
The AirTAC SID125X20S is a discontinued double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding equal push and pull force of 5734 N at 0.5 MPa. It features a 125mm bore, 20mm stroke, G1/2 air port, and M27x2 rod thread. As a direct replacement, the SAID125X20S maintains the exact ISO 15552 mounting interface, port size, and force. The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Because both faces use the rod-side area, force is identical in both directions, preventing single-rod push bias. The second rod resists rotation and can mount a sensor cam. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; use an external rod lock or SAIL/BSAI variant for load holding on air loss.
Airtac SID Series Double-Rod Cylinder SID125X20S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X20S |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAID125X20S 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 SAID125X20S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SID Series Double-Rod Cylinder SID125X20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SID Series Double-Rod Cylinder SID125X20S Is Used
Gripper Synchronization
Drives opposing gripper jaws simultaneously via both rods, ensuring perfectly centered clamping with equal force on the return.
Dual-Side Transfer
Mounts a transfer arm on the rear rod to push a secondary package on the return stroke, doubling throughput without extra valves.
Anti-Rotation Indexing
The twin-rod geometry prevents mechanical twist during heavy 5734 N horizontal indexing, maintaining precision without external guides.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X20S with the SAID125X20S
Replace the discontinued SID125X20S directly with the SAID125X20S, reusing your existing FA, LB, or TC ISO 15552 mounts. Size both directions by checking neighbouring bores: the 100mm bore yields 3681 N at 0.5 MPa, while the 160mm bore yields 9425 N, so choose based on your equal-both-ways requirement. A double-rod design is correct when you need anti-rotation, equal force, or a back rod to drive a second tool. The -S suffix ensures a piston magnet is present for legacy CS1-B/DS1-B sensors. Since the stroke is 20mm, side-load bending is minimal, but for any stroke over 300mm, carefully guide the rod to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X20S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SID Series Double-Rod Cylinder SID125X20S FAQ
Yes, the SID125X20S is discontinued. The direct replacement is the SAID125X20S. It shares the same ISO 15552 interface, 125mm bore, 20mm stroke, G1/2 port, and mounting, but adds an upgraded two-piece Y-shaped piston seal for longer life.
Force is equal both ways: 5734 N at 0.5 MPa, 8028 N at 0.7 MPa, and 10321 N at 0.9 MPa. Speed is 30-500 mm/s. The cylinder uses a G1/2 port, M27x2 rod thread, and 40mm adjustable cushions. It cannot hold loads without live air; use an external rod lock for holding.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X20S replacement — usually within 7-8 hours.