The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X50-20 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. Ø80mm bore, 50mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X50-20 is an 80 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston stop position without changing the cylinder, delivering 2513 N of push force at 0.5 MPa and up to 4523 N at 0.9 MPa. The 25 mm piston rod and PT3/8 ports suit medium-force pneumatic tasks where commissioning or format changes demand quick stroke adjustment.
Built as a robust tie-rod cylinder with a 239 mm body length, the SCJ80X50-20 uses a 28 mm air cushion to decelerate the piston quietly at stroke end. The adjustable screw sets only the stroke end position, not force or speed, making it a practical choice for end-stop tuning on conveyors, jigs, and packaging machinery. This genuine AirTAC unit is ready to ship from AirtacDistr stock.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X50-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×50 | 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.
Fine-tune the end-of-stroke position during machine commissioning without removing or swapping the cylinder, speeding up line start-up.
Quickly adjust the stroke to handle different product sizes on packaging or sorting conveyors, reducing downtime between batches.
Take up mechanical play or tooling wear over time by adjusting the screw, maintaining precise end-stop location without replacing parts.
Choose the SCJ80X50-20 when 2513 N of push at 0.5 MPa is sufficient and you need on-machine stroke adjustability. If force is marginal, stepping up to the 100 mm bore SCJ100 provides 3927 N push at the same pressure. For applications where the stroke length is fixed and never changes, the standard SC80X50 fixed-stroke cylinder is a simpler, cost-effective alternative. This SCJ80X50-20 replaces any AirTAC SCJ80X50-20 with PT ports and basic mounting; ensure the 20 mm adjustment range matches your setup.
Adjustable-stroke checklist
At 0.5 MPa it delivers 2513 N pushing and 2268 N pulling. At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N. The push force is higher than the pull force because it is a single-rod cylinder.
Only if you need the adjustable stroke feature. The SCJ80X50-20 has a longer body (239 mm) than the fixed-stroke SC80 to house the adjusting screw. Check that your mounting space can accommodate the extra length before swapping.
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