The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-30 is a 63 mm bore double-acting, single-rod cylinder with a rear adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston stop position without replacing the cylinder or adding external hard stops. At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, drawing air through PT1/4 ports.
The tie-rod construction and 20 mm diameter piston rod suit medium-duty linear positioning tasks. The body length A (SCJ) is 197 mm, and the standard air cushion is 28 mm long to decelerate the piston near stroke end. The 400 mm nominal stroke is well within the 1500 mm maximum standard stroke for this bore, ensuring stable rod support in horizontal applications.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 28 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -30 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
The 30 mm rear screw lets technicians dial in the exact retract stop position during machine setup, accommodating stack-up tolerances without re-machining end stops.
Adjust the stroke end to match different box or carton sizes on a packaging machine. The 1559 N push force handles medium-weight product pushers and diverters.
In a clamping or pressing fixture, the screw compensates for pad wear over time, maintaining consistent clamp force without replacing the cylinder or shimming the tooling.
Choose this 63 mm bore when the 50 mm bore's 982 N push at 0.5 MPa is slightly too low, but the 80 mm bore's 2513 N is more force than the structure requires. The 30 mm adjustment range is ideal for commissioning trials where the final stroke length is determined empirically on the machine. If the stroke must be identical every cycle with no field variation, a fixed-stroke SC63X400 is a simpler alternative.
For a drop-in replacement, match the 63 mm bore, 400 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting. At 400 mm stroke, ensure the rod is guided externally or use a guided cylinder if the load applies significant side force, to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
A screw in the rear cap limits how far the piston can retract. Turning the screw shortens the stroke end by up to 30 mm from the nominal 400 mm. It sets the mechanical stop position; it does not adjust air pressure, speed, or force.
At 0.5 MPa, push force is 1559 N and pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. Pull force is always lower because the 20 mm rod reduces the effective piston area on the return stroke.
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