This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X250S, 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 SID40X250S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X250S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X250S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X250S
- 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 SID40X250S
The AirTAC SID40X250S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This model is discontinued. The direct replacement is the SAID40X250S, matching the 40mm bore, 250mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI family upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
With a 16mm rod and M12x1.25 thread, the dual-rod design prevents rotation and allows the back rod to drive a second tool or carry a sensor cam. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate near stroke end; for load holding on air loss, use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID40X250S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X250S |
| Bore size | Ø40 mm |
| Stroke | 250 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 SAID40X250S 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 SAID40X250S 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 SID40X250S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SID40X250S Is Used
Synchronized Transfer
Drives opposing conveyor arms simultaneously with equal push and pull force, preventing material rotation during transit.
Dual-Tool Machining
Powers a primary cutting tool on the front rod while the back rod actuates a secondary clamping fixture.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X250S with the SAID40X250S
To replace the discontinued SID40X250S, install the direct replacement SAID40X250S, which reuses the exact ISO 15552 mounting footprint (Basic, FA, LB, TC) and G1/4 port. Size both directions by verifying the equal 528 N force at 0.5 MPa is sufficient; if higher force is needed, step up to the 50mm bore, or drop to 32mm for lighter loads. A double-rod cylinder is the right choice when you need anti-rotation stability or must drive two mechanisms synchronously. Keep the -S option if you require piston magnet sensing. For this 250mm stroke, ensure your mechanical setup handles side loads to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X250S
- ✓ 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 SID40X250S FAQ
Yes, the SID40X250S is discontinued. The direct replacement is the SAID40X250S. It shares the same ISO 15552 mounting interface, 40mm bore, 250mm stroke, G1/4 port, and equal both-ways force, but features an upgraded piston seal for longer life.
The double-rod design provides equal force both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It features a 16mm rod, M12x1.25 thread, G1/4 port, adjustable 27mm cushions, and operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X250S replacement — usually within 7-8 hours.