The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-20TC 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-20TC is a 63 mm bore double-acting, single-rod cylinder that lets you dial in the stroke end position with a rear adjusting screw, giving up to 20 mm of fine adjustment from the 125 mm nominal maximum. With a push force of 1559 N at 0.5 MPa and a 20 mm diameter piston rod, it handles mid-range positioning and clamping tasks where the final stop point must be set precisely on the machine.
This model ships with a centre trunnion (TC) mount and the matching TCM1 bracket, allowing the cylinder to pivot as it strokes. The PT1/4 ports, 28 mm air cushion, and TPU seals suit standard compressed-air systems. The body length A(SCJ) is 197 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-20TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 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. |
| ×125 | 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.
The 20 mm rear screw adjustment lets commissioning engineers dial in the exact extend position for a clamp or press plate without re-machining stops or changing cylinder hard parts.
On packaging or labelling lines, operators can quickly shift the stroke end to accommodate a new box or bottle size, reducing downtime during batch changeovers.
As gripper pads or tooling surfaces wear over thousands of cycles, the adjustable stroke can be lengthened slightly to maintain consistent contact pressure and part engagement.
Choose this 63 mm bore when the 50 mm bore's 982 N push at 0.5 MPa is marginal and the 80 mm bore's 2513 N is overkill for the fixture. The SCJ adjustable stroke is the right call whenever commissioning trials, format changes, or tooling wear require the end position to be shifted without swapping the cylinder or adding external hard stops. If the stroke never needs field adjustment, the fixed-stroke SC63X125 is a simpler alternative. For a direct replacement, match the 63 mm bore, 125 mm nominal stroke, 20 mm adjust range, PT thread, and the TC centre trunnion mounting with the F-SC63TC bracket.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the difference is due to the single 20 mm rod). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
Yes, if you need the 20 mm stroke-end adjustment. The SCJ63 body is slightly longer (197 mm A-length) than the fixed SC63. Ensure the centre trunnion pivot location works with your existing mounting, and match the PT port thread and nominal 125 mm stroke.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.