This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X125STC, 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 SID40X125STC
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X125STC 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 SAID40X125STC, 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 → SAID40X125STC
- 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 SID40X125STC
The AirTAC SID40X125STC is a discontinued double-acting double-rod ISO 15552 cylinder. A rod exits both ends on one piston, meaning both faces use the rod-side area, so push and pull force are equal (528N at 0.5MPa). The direct replacement is the SAID40X125STC, retaining the same 40mm bore, 125mm stroke, G1/4 port, and TC mounting interface. The SAI upgrade uses an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Because the second rod acts as an anti-rotation guide and can carry a sensor cam, it is ideal for precise driving. The bore has a 16mm rod, M12x1.25 thread, and 27mm cushions. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. Note: air cushions only decelerate; use an external rod lock or SAIL/BSAI variant for load holding.
Airtac SID Series Double-Rod Cylinder SID40X125STC Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X125STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X125STC |
| 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 SAID40X125STC 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 SAID40X125STC 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 SID40X125STC
| 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 SID40X125STC Is Used
Equal-Force Gripper Actuation
Drives an opposing jaw mechanism where the equal push and pull force of 739N at 0.7MPa ensures consistent clamping pressure regardless of grip direction.
Dual-Tool Transfer Unit
The second rod protruding from the rear cap drives a secondary mechanism or sensor cam simultaneously, synchronizing two separate conveyor actions in one stroke.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X125STC with the SAID40X125STC
To replace the discontinued SID40X125STC, swap it directly for the SAID40X125STC; the ISO 15552 mounting interface and TC accessory mean no bracket changes are needed. Size both ways by checking the equal force: 40mm yields 528N at 0.5MPa, while the neighboring 32mm bore gives 345N and 50mm gives 825N. Choose a double-rod design when you need equal push/pull force, anti-rotation stability, or a back rod to mount a sensor cam. The -S magnet is required for position sensing. For this 125mm stroke, side-load is minimal, but for strokes >=300mm ensure a guide to prevent rod binding. Remember, a plain cylinder drifts on air loss; use a pilot-operated check valve or SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X125STC
- ✓ 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 SID40X125STC FAQ
Yes, the SID40X125STC is discontinued. The direct replacement is the SAID40X125STC. It shares the same ISO 15552 interface, 40mm bore, 125mm stroke, G1/4 port, and TC mounting, but adds an upgraded piston seal for longer life.
Because it is a double-rod cylinder, force is equal both ways: 528N at 0.5MPa, 739N at 0.7MPa, and 950N at 0.9MPa. The fixed air port is G1/4, the rod is 16mm with an M12x1.25 thread, and it includes 27mm adjustable cushions at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X125STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X125STC replacement — usually within 7-8 hours.