The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X300-50S is a 50mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 50mm of field-adjustable stroke reduction. This allows you to fine-tune the stroke end position from 250mm to the nominal 300mm maximum without swapping the cylinder or adding external hard stops. Its 20mm diameter piston rod delivers 982 N of push force and 825 N of pull force at 0.5 MPa, making it a solid mid-range actuator for applications that need commissioning flexibility.
This model includes a built-in magnet (-S suffix), so standard CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke or mid-stroke position feedback. The body length A(SCJ) is 194mm plus the stroke, and the integrated PT1/4 ports keep plumbing compact. With a 1200mm maximum standard stroke for this bore, the 300mm stroke is well within standard limits, ensuring fast delivery from AirTAC stock.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 50 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, 21 mm |
| Max stroke | Up to 1200 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Dial in the exact 250-300mm stroke on a new assembly line without machining custom stops. The 50mm adjustment range lets technicians fine-tune the end position during initial run-off.
Quickly adapt a pusher or diverter to different product widths. The adjusting screw lets an operator change the stroke from 300mm down to 250mm in seconds when switching between box sizes.
Take up mechanical play in a clamping or pressing station over time. As tooling wears, the 50mm screw adjustment brings the cylinder’s end stop back into precise contact without replacing parts.
Choose the SCJ50 when the 40mm bore’s 628 N push force at 0.5 MPa is too light but the 63mm bore’s 1559 N is oversized for your load. The 50mm adjustable-stroke cylinder hits a practical sweet spot for many medium-duty automation tasks. If your application does not require field stroke adjustment, the fixed-stroke SC50 offers a slightly shorter overall body length. For strokes of 300mm and above, be mindful of side loads on the extended rod; if the load is not perfectly guided, add an external linear guide or consider a guided cylinder to prevent rod bending and premature seal wear. A direct replacement must match the 50mm bore, 300mm nominal stroke, 50mm adjust range, PT port thread, basic mounting, and the -S magnet option.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 50mm bore cylinder provides 982 N of push force and 825 N of pull force. The push force is higher because the single rod reduces the piston area on the pull side. At the maximum 0.9 MPa operating pressure, the push force reaches 1767 N.
A screw in the rear cap sets the stroke end position. You can shorten the nominal 300mm stroke by up to 50mm, giving you an effective stroke range of 250-300mm. It adjusts the mechanical stop point only—it does not change the cylinder's speed or force, and it is not a locking device.
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