This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X135S, 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 SID40X135S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X135S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 135mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X135S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X135S
- 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 SID40X135S
The AirTAC SID40X135S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Both faces use the rod-side area, so push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This 40 mm bore model features a 16 mm rod, M12x1.25 rod-end thread, G1/4 air port, and 27 mm adjustable air cushions at each end. The SID40X135S is discontinued and the direct replacement is the SAID40X135S, sharing the same interface, bore, stroke, force, port and mounting.
The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI line lacked. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Because both faces use the rod-side area, the double-rod design delivers equal both ways force, preventing rod-side drift and allowing the back rod to carry a sensor cam.
Airtac SID Series Double-Rod Cylinder SID40X135S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X135S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X135S |
| Bore size | Ø40 mm |
| Stroke | 135 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 SAID40X135S 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 SAID40X135S 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 SID40X135S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SID40X135S Is Used
Equal-Force Transfer
Drives a conveyor pop-up transfer gate where the equal both ways 528 N @0.5 MPa force ensures consistent forward and retract motion without rod-side drift.
Dual-Tool Machining
The exiting back rod carries a second tool or sensor cam, allowing one 40 mm bore cylinder to operate two separate workstations simultaneously with a 27 mm cushion.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X135S with the SAID40X135S
To replace the discontinued SID40X135S, specify the direct replacement SAID40X135S, which reuses the exact ISO 15552 mounting interface (Basic, FA, LB, TC, FTC, TCM1, TCM2) and retains the G1/4 port. Size both ways by confirming the 528 N @0.5 MPa equal force is sufficient; if more force is needed, step up to the 50 mm bore (825 N @0.5 MPa), or step down to 32 mm (345 N @0.5 MPa) if lower. A double rod is right when you need equal push/pull force, anti-rotation stability, or a back rod to drive a second tool. Retain the -S magnet for position sensing. Since the 135 mm stroke is under 300 mm, side-load buckling is minimal, but always verify guide alignment. A plain cylinder does not hold loads on air loss; for held loads use an external rod lock, pilot-operated check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X135S
- ✓ 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 SID40X135S FAQ
Yes, the AirTAC SID40X135S is discontinued. The direct replacement is the SAID40X135S. It shares the same ISO 15552 interface, 40 mm bore, 135 mm stroke, G1/4 port, and mounting, but uses an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
As a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It operates at 0.15-1.0 MPa with a speed range of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X135S
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