The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X175-50S 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. Ø80mm bore, 175mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X175-50S delivers a field-adjustable stroke end via a rear-cap screw, letting you fine-tune the 175mm nominal stroke down by up to 50mm without swapping the cylinder. With a 25mm piston rod and PT3/8 ports, this double-acting single-rod unit produces 2513N of push force at 0.5MPa and 4523N at 0.9MPa, making it a strong mid-range actuator for format changes and commissioning tweaks.
This model includes a built-in magnet (S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke or mid-position sensing. The body length A is 239mm, and the adjustable air cushion decelerates the piston smoothly within the 30-800mm/s speed range. Operating pressure spans 0.15-1.0MPa with a proof pressure of 1.5MPa.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X175-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 50 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. |
| ×175 | 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.
The 50mm rear-screw adjustment lets operators quickly dial in a new stroke end position when a packaging machine switches between box sizes, eliminating mechanical stop changes.
In high-cycle clamping or pressing fixtures, the adjustable stroke compensates for pad or tooling wear over time, maintaining consistent contact force without replacing the cylinder.
During machine build and debug, the SCJ80X175-50S allows engineers to experimentally set the optimal stroke end point, then lock it in place once the process is validated.
Step up to the SCJ100 (3927N push at 0.5MPa) if your load exceeds the 2513N available here, or down to the SCJ63 (1559N) for a lighter, more compact solution. When the application does not need field adjustment, a fixed-stroke SC80 cylinder is a simpler, lower-cost alternative. For exact replacement, match an AirTAC SCJ80X175-50S with PT threads, basic mounting, and the S magnet option; the stroke-adjust range must be 50mm to preserve the same tuning window. At 175mm nominal stroke, rod deflection is minimal, but if side loads are present, add an external guide rail or consider a guided cylinder.
Adjustable-stroke checklist
At 0.5MPa, push force is 2513N and pull force is 2268N. At the maximum operating pressure of 0.9MPa, push reaches 4523N. The pull force is lower because the 25mm rod reduces the effective piston area on the return stroke.
Yes, this is a direct replacement for any AirTAC SCJ80 with a 175mm nominal stroke and 50mm adjust range, provided the original also used PT ports, basic mounting, and the S magnet option. Verify the mounting style and port thread match your existing setup.
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