The AirTAC AirTAC SDA20X40BH Compact Cylinder | 20mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø20mm bore and 40mm stroke, M5×0.8 air ports and a riveted short body that saves mounting depth. Sensor slots around the body accept magnetic switches for position sensing.
The AirTAC SDA20X40BH is a double-acting, single-rod compact cylinder engineered where axial mounting depth is strictly limited. Its short riveted body integrates the barrel, rear cover, piston, and 8 mm rod into a minimal footprint, saving valuable machine space compared to conventional round-body units. Driven by filtered air at 0.15-1.0 MPa, it generates 157.1 N of push force and 131.9 N of pull force at 0.5 MPa.
This specific configuration includes an H-option fluororubber (FKM) seal for enhanced thermal and oil resistance. The B-option provides a male M6x1.0 threaded piston rod end for direct load coupling. End-of-stroke deceleration is handled by a fixed NBR bumper rather than an adjustable air cushion. Note that without the S-option piston magnet, this unit cannot host reed or electronic switches.
| Model | AirTAC SDA20X40BH Compact Cylinder | 20mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | M5×0.8 |
| Rod end thread | M4×0.7 female / M6×1.0 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 90 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 | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 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. |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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).
Actuates the cutting tool feed on an electronics assembly line, where the compact 40 mm stroke and FKM seals resist ambient flux fumes and save axial tooling space.
Pushes a tamp pad onto product cartons, utilizing the 157.1 N extend force to press labels firmly while fitting within the narrow frame of the packaging head.
Drives a precision fluid dispense valve for adhesive application, benefiting from the male M6x1.0 rod end for secure mounting and the short body for dense multi-head arrays.
When sizing this 20 mm bore actuator, evaluate your force margins: stepping down to the SDA16 yields 100.5 N of push at 0.5 MPa, while stepping up to the SDA25 provides 245.4 N. Based on the 157.1 N push rating, the safe working load is approximately 94 N (about 60% capacity), translating to a vertical lift capability of roughly 8 kg with a 2:1 safety margin. Ensure your ordering essentials match this SKU exactly: 20 mm bore, 40 mm stroke, M5x0.8 port, male M6x1.0 rod thread, FKM seals, and no sensor magnet. If your mechanism must maintain a vertical position during air loss or valve centering, be aware this cylinder will drift; the fixed bumper only decelerates the stroke end and acts as neither a lock nor a brake. An external rod lock or pilot-operated check valve is required for holding loads.
Quick checklist
This double-acting cylinder delivers 157.1 N push and 131.9 N pull at 0.5 MPa, and 219.9 N push at 0.7 MPa. The theoretical maximum push force is 32 kgf at 1.0 MPa. It operates on filtered air between 0.15-1.0 MPa, with a proof pressure of 1.5 MPa, and supports a speed range of 30-500 mm/s.
It relies on a fixed NBR bumper at each end to decelerate the piston, which is not an adjustable air cushion; for high-energy cycles, slow the approach or add external shock absorbers. Because this specific SKU lacks the S-option magnet, it cannot support reed or electronic switches, and it will not hold a load without live air pressure.
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