Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S
The AirTAC Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S is a genuine double-acting COMPACT cylinder (Ø25mm bore) whose extend end-position is set by an external M8×1.25 adjustment screw. You can dial the stroke anywhere from 30 to 50 mm on the machine — no shims, no part change.
- BoreØ25 mm
- Max stroke50 mm
- Adjustable range30–50 mm
- Adjuster threadM8×1.25
- Port sizeM5×0.8
- CushionFixed NBR bumper (both ends)
- 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 SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S
The AirTAC SDAJ25X50-20S is a compact double-acting single-rod cylinder featuring an external adjustable extend stop. By turning the R (M8x1.25) screw, you shorten the forward stroke on-site across a 30 to 50 mm window, eliminating the need for shims or part swaps during changeovers. Retract travel remains full length.
Because the adjuster sets the mechanical stop rather than the piston area, output force matches a standard SDA of this bore, delivering about 245.4 N push at 0.5 MPa. The short riveted body saves axial mounting depth where round-body units will not fit, while a fixed NBR bumper decelerates the stroke end. This -S variant includes a built-in piston magnet for AirTAC reed or electronic switches.
Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S Technical Specifications
| Model | Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S |
|---|---|
| Series | SDAJ compact adjustable-stroke cylinder |
| Bore size | Ø25 mm |
| Max stroke | 50 mm |
| Adjustable range | 30 – 50 mm |
| Adjuster thread (R) | M8×1.25 |
| Port size | M5×0.8 |
| Acting type | Double acting |
|---|---|
| Rod end thread | M5×0.8 F / M8×1.25 male (B) |
| 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) |
The adjustment screw shortens the extend stroke by up to 20 mm. Force is unchanged from a standard SDA of the same bore. Specifications follow the official AirTAC SDAJ datasheet.
Theoretical Output Force (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | — |
| Max (@1.0 MPa) | 50 kgf | |
Force matches a standard SDA of the same bore; the adjuster only sets the stop position, not the area. Actual usable force is lower than theoretical due to friction.
Model Code: Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S
| SDAJ | Compact double-acting cylinder with adjustable stroke. |
|---|---|
| 25 | Bore size in mm. |
| ×50 | Maximum stroke length in mm. |
| -20 | Adjustable window (10/20/30/40/50/75/100 mm). |
| S / B | S = magnet; B = male-thread rod (both optional). |
Thread: PT standard. Related SDA-family variants: SDA (fixed stroke), SDAD (double rod), SSA/STA (single acting), SDAT (duplex), SDAW (duplex-end).
Where the Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S Is Used
Tooling Changeover
Dial the extend stop from 30 to 50 mm via the M8x1.25 screw to accommodate different jig heights on machining lines without machining new spacers.
Flap Folding Arms
Fine-tune the 245.4 N push stroke on carton erectors to handle varied box formats precisely, relying on the fixed NBR bumper for end deceleration.
Vertical Lift Stops
Safely lift approximately 12.5 kg with a 2:1 margin, adjusting the downward extend position on the fly while using the magnet for end-of-travel confirmation.
Is the Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S the Right Cylinder?
When sizing this 25 mm bore, look both ways: dropping down to SDAJ20 yields 157.1 N push at 0.5 MPa, whereas stepping up to SDAJ32 provides 402.1 N. This model sits perfectly in the middle for medium-duty positioning. Based on the 245.4 N figure, a safe working load is roughly 147 N (about 60 percent capacity), translating to a vertical lift of approximately 12.5 kg with a 2:1 safety margin.
Operators who require frequent on-machine stroke tuning will benefit from the 20 mm adjustment window. Remember that a plain cylinder does not hold its load on air loss or when the valve is centred; the piston drifts and the fixed bumper only decelerates near the end. For secure load holding without live pressure, install an external rod lock or pilot-operated check valve. Confirm your bore, 50 mm max stroke, 20 mm window, M5x0.8 port, female M5x0.8 rod thread, and the -S magnet option.
Quick checklist
- ✓ Need on-machine stroke fine-tuning?
- ✓ Target position within 30–50 mm
- ✓ Force at your working pressure
- ✓ Access to reach the R adjuster
- ✓ Magnet (S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Lock the M8×1.25 adjuster after setting the stroke.
- check Avoid side load on the piston rod.
- check Front/rear covers are riveted — do not dismantle.
- check Installation by qualified personnel per AirTAC docs.
Airtac SDAJ12~25 Adjustable Ultra-Thin Cylinder SDAJ25X50-20S FAQ
This 25 mm bore double-acting cylinder provides 245.4 N push and 206.2 N pull at 0.5 MPa, and 343.6 N push at 0.7 MPa. The theoretical maximum push is 50 kgf at 1.0 MPa. It operates between 0.15 and 1.0 MPa, handles speeds of 30-500 mm/s, and functions in temperatures from -20 to +70 C.
The external R (M8x1.25) screw mechanically shortens the extend end-position by up to 20 mm, giving a usable 30 to 50 mm range. It sets the stop without changing the force, but it is not a mid-stroke lock. The included -S magnet works with AirTAC reed or electronic switches for position sensing.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SDAJ Cylinders
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