The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø63mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-20 is a double-acting, single-rod pneumatic cylinder that puts 1559 N of push force at 0.5 MPa into a compact tie-rod body. Its defining feature is the rear-cap adjusting screw, which lets you shorten the stroke end by up to 20 mm without removing the cylinder—ideal for commissioning tweaks or format changeovers where a fixed 75 mm stroke would need shimming.
With a 20 mm piston rod, M16×1.5 rod thread, and PT1/4 ports, this 63 mm bore unit shares the same force curve as the fixed-stroke SC63. The adjustable cushion decelerates the piston smoothly, and the body length A(SCJ) is 197 mm. At the maximum operating pressure of 0.9 MPa, push thrust reaches 2805 N, giving you a wide force window for clamping, pressing, or positioning tasks.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 20 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. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
During machine bring-up, the 20 mm rear screw lets technicians tweak the stroke end position in seconds. No need to swap cylinders or machine custom spacers—just turn the screw to dial in the exact stop point for grippers, pushers, or ejectors.
On packaging or assembly lines that run multiple product sizes, the adjustable stroke allows operators to reset the cylinder throw for different box heights or part lengths. The 63 mm bore’s 1559 N push force handles medium-weight diverters and gates reliably.
In pressing or clamping stations where tooling wears over time, the stroke-end adjuster takes up the slack. The 20 mm range provides ample compensation before re-tooling is needed, keeping cycle times consistent and reducing unplanned downtime.
Choose the SCJ63X75-20 when you need to dial in a precise end position on the machine—the 20 mm adjustment range absorbs tolerance stack-up and lets you fine-tune without external hard stops. If 1559 N push at 0.5 MPa is marginal, stepping up to an 80 mm bore delivers 2513 N; if space is tight, the 50 mm bore still provides 982 N. For applications that demand a fixed, repeatable stroke with no field adjustment, the standard SC63 is a simpler, lower-cost alternative.
A direct replacement must match the 63 mm bore, 75 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting. The SCJ63 mounting subset includes FA front flange, LB foot, and TC centre trunnion with TCM1 bracket—no FB or clevis mounts are available. For strokes of 300 mm or longer, evaluate side-loading and rod buckling; an external guide or a guided cylinder may be necessary.
Adjustable-stroke checklist
At 0.5 MPa, push force is 1559 N and pull force is 1402 N (the difference is due to the single 20 mm rod). At 0.7 MPa, push rises to 2182 N, and at the maximum operating pressure of 0.9 MPa it reaches 2805 N. The theoretical maximum at 1.0 MPa is 318 kgf.
Yes, provided the mounting, port thread (PT), and magnet option match. The SCJ63 body is slightly longer to house the adjusting screw, but the bore, rod, and force ratings are identical. The 20 mm adjust range adds flexibility; if you do not need field adjustment, the SC63 is the direct fixed-stroke equivalent.
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