This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X125S, 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 SID40X125S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X125S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X125S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X125S
- 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 SID40X125S
The AirTAC SID40X125S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding equal push and pull force of 528 N at 0.5 MPa. Because both faces use the rod-side annular area, the 16 mm rod and G1/4 port deliver identical thrust in both directions. This discontinued model is fully replaced by the SAID40X125S, which reuses the exact ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
The SAI family also introduces SAIL and BSAI lock variants absent in the legacy SI line. Note that a standard cylinder drifts on air loss; the 27 mm adjustable cushion only decelerates near stroke end and will not hold a load. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SID Series Double-Rod Cylinder SID40X125S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X125S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X125S |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID40X125S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAID40X125S 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 SID40X125S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SID40X125S Is Used
Equal-Force Transfer
Drives a conveyor pusher bar where identical 528 N thrust on the advance and return strokes keeps the transfer cadence perfectly balanced.
Dual-Tool Machining
Operates two opposing tools simultaneously from one piston, using the second rod end to actuate a secondary clamp without extra valves.
Anti-Rotation Indexing
Indexes a precision pallet in a machining cell, relying on the twin rods to resist torsional twist and maintain alignment without external guides.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X125S with the SAID40X125S
To replace the SID40X125S, specify the SAID40X125S direct: it matches the 40 mm bore, 125 mm stroke, G1/4 port, and ISO 15552 dimensions. When sizing both ways, verify the 528 N @0.5 MPa force is sufficient, or step to the neighbouring 50 mm bore for higher thrust. A double rod is right when you need equal both-ways force, anti-rotation stability, or a back rod to carry a sensor cam. Mounting uses FA, LB, or TC brackets. The -S magnet enables position sensing. For this 125 mm stroke side-load is minimal, but for strokes >=300 mm ensure guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X125S
- ✓ 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 SID40X125S FAQ
Yes, the SID40X125S is discontinued. The direct replacement is the SAID40X125S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 125 mm stroke, and G1/4 port, but features an upgraded piston seal for longer life.
Being double-rod, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. Speed is 30-800 mm/s. It uses a 16 mm rod, M12x1.25 thread, and 27 mm adjustable cushions. It cannot hold a load without live air.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X125S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X125S replacement — usually within 7-8 hours.