This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X370S, 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 SID40X370S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X370S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 370mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X370S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke370 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X370S
- 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 SID40X370S
The AirTAC SID40X370S is a discontinued ISO 15552 double-acting double-rod cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal (528N at 0.5MPa). Because both faces use the identical rod-side area, it provides anti-rotation stability and allows the back rod to carry a sensor cam. The direct replacement is the SAID40X370S, sharing the same 40mm bore, 370mm stroke, G1/4 air port, and ISO 15552 mounting interface.
The SAI replacement upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The bore dictates a 16mm rod with an M12x1.25 thread, adjustable 27mm cushions at each end, and a 30-800mm/s speed range. This -S model includes a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SID Series Double-Rod Cylinder SID40X370S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X370S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X370S |
| Bore size | Ø40 mm |
| Stroke | 370 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 SAID40X370S 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 SAID40X370S 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 SID40X370S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×370 | 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 SID40X370S Is Used
Equal-Force Machining Clamp
Provides identical 528N clamping and release forces at 0.5MPa for machining fixtures, using the dual rods to prevent workpiece twist during cutting.
Dual-End Transfer Pusher
Drives a transfer mechanism on the front stroke while the rear rod simultaneously cycles a secondary diverter, synchronizing two conveyor actions in one motion.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X370S with the SAID40X370S
To replace the discontinued SID40X370S, specify the SAID40X370S, which matches the 40mm bore, 370mm stroke, G1/4 port, and ISO 15552 dimensions exactly. When sizing both ways, verify the equal force of 528N at 0.5MPa is sufficient; if not, evaluate neighbouring bores like the 50mm or 32mm. A double-rod design is the right choice when you need equal push/pull forces, anti-rotation resistance, or a rear rod to drive a second tool. Mounting options include Basic, FA, LB, and TC styles. The -S suffix indicates a built-in magnet for legacy CS1-B/DS1-B sensors. At a 370mm stroke, external guides are recommended to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X370S
- ✓ 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 SID40X370S FAQ
Yes, the SID40X370S is discontinued. The direct replacement is the SAID40X370S, which shares the same ISO 15552 mounting interface, 40mm bore, 370mm stroke, G1/4 port, and equal both-ways force. The SAI family also adds an upgraded piston seal and lock variants like SAIL and BSAI.
The double-rod design ensures force is equal both ways: 528N at 0.5MPa, 739N at 0.7MPa, and 950N at 0.9MPa. The 40mm bore uses a G1/4 air port, a 16mm rod, an M12x1.25 thread, and 27mm adjustable cushions. A plain cylinder does not hold loads on air loss; use an external rod lock or SAIL variant for held loads.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X370S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X370S replacement — usually within 7-8 hours.