The AirTAC AirTAC SDA40X55H Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 55mm 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 SDA40X55H is a double-acting single-rod compact cylinder engineered for tight axial spaces. Its riveted assembly keeps the overall length minimal compared to round-body units, yielding a push force of 628.3 N at 0.5 MPa. This specific SKU includes fluororubber (FKM) seals for heightened oil and thermal endurance, operating within a -20 to +70 C environment.
A 16 mm piston rod threads via a female M8x1.25 end to drive the load, while the PT1/8 port supplies air. End-stops rely on a fixed NBR bumper that decelerates the piston rather than an adjustable air cushion. Because this base unit lacks the -S magnet, it cannot host reed or electronic switches; position sensing requires the -S variant.
| Model | AirTAC SDA40X55H Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 55 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. |
| ×55 | 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 housings inside a CNC machining center, using the 628.3 N extend force to lock parts firmly against a stop during milling.
Drives a mechanical arm to tuck corrugated box flaps prior to tape sealing, where the 55 mm stroke and compact depth fit neatly within the conveyor frame.
Pushes small plastic components out of an injection molding tool, relying on the FKM seals to withstand elevated ambient heat and oil mist.
When sizing this 40 mm bore, stepping down to the SDA32 yields 402.1 N of push at 0.5 MPa, while stepping up to the SDA50 provides 981.7 N. For this 628.3 N output, a safe working load is roughly 377 N (about 60 percent capacity), translating to a vertical lift of approximately 32 kg with a 2:1 safety margin. To finalize your order, confirm the 40 mm bore, 55 mm stroke, PT1/8 port, FKM seal, female rod thread, and no magnet. Note that a standard cylinder drifts if air pressure drops, so integrate an external rod lock or pilot-operated check valve if the mechanism must hold a load unpowered.
Quick checklist
This double-acting cylinder generates 628.3 N push and 527.8 N pull at 0.5 MPa, and 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum push is 128 kgf at 1.0 MPa, with an operating pressure range of 0.15-1.0 MPa.
It uses a fixed NBR bumper at each end to decelerate the piston, which is not an adjustable air cushion; for high-speed cycling, add an external shock absorber. This specific SKU lacks a piston magnet, so it cannot support reed or electronic switches unless you specify the -S option.
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