The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X550-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 550mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X550-100 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 100 mm of field-adjustable stroke reduction. This lets you dial in the exact stroke end position without swapping the cylinder or adding external hard stops. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a practical mid-range actuator for applications that need commissioning flexibility.
The cylinder body length A(SCJ) is 185 mm plus stroke, and the integrated air cushion (21 mm) decelerates the piston smoothly at both ends. Operating on 40 µm filtered air from 0.15 to 1.0 MPa, the SCJ40X550-100 handles speeds of 30-800 mm/s. Its PT1/4 ports and M12x1.25 rod thread match standard AirTAC SCJ40 tooling, and the tie-rod construction keeps service straightforward.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X550-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 550 mm |
| Stroke adjustment | Up to 100 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | Nominal (maximum) stroke length in mm. |
| -100 | 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 100 mm adjust range lets technicians fine-tune the end-of-stroke position on the fly. No need to machine spacer blocks or re-order a different stroke length—just turn the rear screw until the actuator lands exactly where the process needs it.
On packaging or assembly lines that run multiple product sizes, the adjustable stroke allows a single cylinder to handle different push or stop positions. Operators can quickly dial in a new stroke end for each format without mechanical rework.
In clamping or pressing stations where tooling gradually wears or compresses, the rear adjuster lets you take up the slack and restore the original contact position. This keeps cycle times consistent and avoids premature tool replacement.
Step up to the SCJ50 bore when you need more force—the 50 mm cylinder pushes 982 N at 0.5 MPa, a 56% increase over this 40 mm model's 628 N. If your stroke is fixed and you never need to tweak it after installation, the standard SC40 fixed-stroke cylinder is a simpler, slightly shorter alternative. For a direct replacement, match an AirTAC SCJ40 adjustable-stroke cylinder with a 550 mm nominal stroke, 100 mm adjust range, PT ports, and the same basic mounting configuration.
At a 550 mm stroke, the rod is extended far enough that side loads become a real concern. If your application imposes any lateral force on the rod end, add an external linear guide or consider a guided cylinder to protect the rod bearing and piston seals from uneven wear.
Adjustable-stroke checklist
Push force at 0.5 MPa is 628 N, and pull force is 528 N (the difference comes from the 16 mm rod area on the return side). At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1280 N. Always size your cylinder using the pull force if the return stroke does the work.
Yes, provided the bore, port thread (PT1/4), and mounting style match. The SCJ40X550-100 has the same push/pull forces as an SC40 of equivalent bore and pressure, but the body is slightly longer to accommodate the adjusting screw. Ensure your machine has clearance for the extra length and that the 100 mm adjust range covers your stroke variation needs.
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