The AirTAC AirTAC SDA40X85SB Compact Cylinder | 40mm Bore is a genuine double-acting COMPACT (thin) air cylinder with a Ø40mm bore and 85mm 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 SDA40X85SB is a double-acting, single-rod compact cylinder engineered with a 40 mm bore and an 85 mm stroke. Its riveted assembly merges the barrel, rear cover, piston, and rod to drastically reduce axial mounting depth, making it ideal for machinery where a conventional round-body unit would protrude too far. At 0.5 MPa, it generates 628.3 N of push force and 527.8 N of pull force.
This specific configuration includes a built-in piston magnet (-S) for direct mounting of AirTAC reed or electronic switches along the body grooves, plus a male-thread piston rod (-B) sized at M14x1.5 for secure mechanical load coupling. End-of-stroke deceleration relies on a fixed NBR bumper rather than an adjustable air cushion, meaning operators should slow the approach or utilize external shock absorbers during high-speed operations. The hard-anodized bore and two-way piston seal ensure durable, low-friction cycling across the 30-500 mm/s speed range.
| Model | AirTAC SDA40X85SB Compact Cylinder | 40mm Bore |
|---|---|
| Series | SDA compact (thin) cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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. |
| ×85 | 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 routing gates on high-speed packaging lines, utilizing the 628.3 N extend force to push cartons weighing up to 32 kg onto secondary conveyor belts.
Provides compact ejection force inside tight moulding cells, where the short riveted body saves axial space and the male M14x1.5 rod threads directly into the ejector plate.
Applies precise downward pressure on electronic component assemblies, using the fixed NBR bumpers to soften the end-stop while AirTAC electronic switches confirm stroke completion.
When sizing this 40 mm bore unit, consider stepping down to the SDA32, which yields 402.1 N of push force at 0.5 MPa for lighter duties, or moving up to the SDA50, which provides 981.7 N at the same pressure for heavier loads. For the SDA40X85SB, the safe working load is approximately 377 N (about 60% of the 628.3 N figure), 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 drops or the valve is centered; maintaining vertical loads safely requires adding an external rod lock or a pilot-operated check valve. To finalize your order, confirm the 40 mm bore, 85 mm stroke, PT1/8 port, male M14x1.5 rod thread, and the integrated magnet.
Quick checklist
This double-acting 40 mm bore cylinder outputs 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum push force is 128 kgf at 1.0 MPa. It operates between 0.15 and 1.0 MPa, with a proof pressure of 1.5 MPa, and functions in temperatures from -20 to +70 C.
No, the SDA series uses a fixed NBR bumper at each end to decelerate the piston, which is not a field-adjustable air cushion. For high kinetic energy or fast cycling speeds, you should either reduce the approach speed via flow controls or install an external shock absorber to prevent premature wear.
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