The AirTAC AirTAC SDA40X25BH Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 25mm stroke, PT1/8 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
The AirTAC SDA40X25BH is a double-acting, single-rod compact cylinder engineered for tight axial spaces. It generates 628.3 N of push force and 527.8 N of pull force at 0.5 MPa. The riveted unibody design merges the barrel, rear cover, piston, and rod to drastically reduce overall length compared to conventional round-body units. Equipped with a hard-anodized bore and a two-way piston seal, it handles operating pressures up to 1.0 MPa.
This specific configuration includes a male M14x1.5 threaded piston rod (overriding the default female M8x1.25) for robust load coupling, alongside high-temperature fluororubber (FKM) seals. Instead of an adjustable air cushion, the piston strikes a fixed NBR bumper at each end to decelerate the stroke. Because this SKU lacks the -S magnet option, it cannot host reed or electronic switches.
| Model | AirTAC SDA40X25BH Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | PT1/8 |
| Rod end thread | M8×1.25 female / M14×1.5 male (B) |
| 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 – 500 mm/s |
| Cushion | Fixed NBR bumper (both ends) |
| Max standard stroke | Up to 120 mm |
Specifications follow the official AirTAC SDA compact-cylinder datasheet. Confirm against the product label before installation. Port thread: PT (standard). Rod: female thread (blank) / male thread (B).
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SDA | Compact (thin) double-acting cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| S | Built-in magnet for magnetic-switch position sensing (omit = no magnet). |
| B | Male-thread piston rod (omit = female-thread rod). |
Thread: PT standard. Related SDA-family variants: SSA (single-acting push), STA (single-acting pull), SDAD (double rod), SDAJ (adjustable stroke), SDAT (duplex), SDAW (duplex-end).
Secures aluminum engine blocks during CNC machining. The male M14x1.5 rod provides a rigid thread interface for custom clamp arms, while the FKM seals resist synthetic cutting fluid mist.
Pushes finished plastic bottles out of a blow molding station. The short 25mm stroke and compact riveted body save axial depth on tight conveyor lines, operating safely within the 30-500 mm/s speed range.
Actuates the doffing rail to release full yarn bobbins. The fixed NBR bumpers absorb the repetitive end-of-stroke impact, preventing structural damage to the loom frame during high-frequency cycling.
Selecting this 40mm bore involves balancing your force requirements and mounting footprint. If you need less force, stepping down to the SDA32 provides 402.1 N of push at 0.5 MPa; if your application demands more power, the SDA50 offers 981.7 N. For the SDA40X25BH, the theoretical safe working load is approximately 377 N (about 60% of the 0.5 MPa push force), translating to a vertical lift capacity of roughly 32 kg with a 2:1 safety margin. Keep in mind that a standard compact cylinder will drift and cannot hold a load if air pressure is lost or the valve is centered—an external rod lock or pilot-operated check valve is required for secure positioning. When ordering, confirm the 40mm bore, 25mm stroke, PT1/8 port, male M14x1.5 rod, and FKM seal specifications.
Quick checklist
At 0.5 MPa, the push force is 628.3 N and the pull force is 527.8 N. At 0.7 MPa, the push force is 879.6 N and the pull force is 738.9 N. The theoretical maximum push force is 128 kgf at 1.0 MPa, which is the maximum operating pressure.
No, this specific SKU does not include the -S piston magnet, so it cannot host reed or electronic switches. You would need the -S variant for sensing capabilities. Additionally, the fixed NBR bumpers only decelerate the piston near stroke end; they do not function as an adjustable air cushion.
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