The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø250mm bore, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X500-40S is a heavy-duty, double-acting single-rod cylinder with a field-adjustable stroke end, delivering a substantial 24544 N of push force at just 0.5 MPa. Its rear-cap adjusting screw provides up to 40 mm of fine-tuning on the stroke end position, making it ideal for commissioning large-scale automation or compensating for wear in high-cycle pressing and clamping operations without swapping the cylinder.
This ISO 6430 class tie-rod cylinder features a 50 mm diameter piston rod, a 1-inch PT port, and an M42x2 rod thread for robust mechanical connections. The built-in magnet (S) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable end-of-stroke detection, while the 40 mm cushion length helps decelerate the high inertial loads typical of this 250 mm bore class.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -40 | 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 bottom-dead-center position of a large hydraulic-pneumatic press during setup, using the 40 mm adjustment screw to achieve perfect part compression without reprogramming the press controls.
In high-cycle lumber or steel beam clamping, the adjustable stroke takes up pad wear over time. Operators can periodically advance the stroke end to maintain consistent clamping force without immediate pad replacement.
Adjust the end stop of a large tube-bending cylinder to switch between different bend angles. The 40 mm range allows for quick mechanical adjustment between product batches on the shop floor.
Select the SCJ250 when your application demands the highest force in the SCJ range, with 24544 N push at 0.5 MPa. If a smaller footprint and lower force are acceptable, stepping down to the 200 mm bore reduces push force to 15708 N. The 40 mm adjustable stroke is a key differentiator from the fixed-stroke SC series, allowing operators to dial in the exact stop position for format changes on large presses.
For this 500 mm stroke length, carefully manage side loads and rod buckling risks; use an external guide rail or consider a guided cylinder if the load is not perfectly axial. A direct replacement must match the 250 mm bore, 500 mm nominal stroke, 40 mm adjust range, 1-inch PT port, and the -S magnet option.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder provides 24544 N of push force and 23562 N of pull force. The maximum push force at the 0.9 MPa operating limit is 44178 N. The push force is higher than the pull force because it is a single-rod cylinder.
A rear-cap screw lets you shorten the stroke end by up to 40 mm from the 500 mm nominal maximum, allowing precise mechanical stop adjustment. You can replace a fixed-stroke SC with this SCJ if you need field adjustability, but you must match the 250 mm bore, PT port, and ensure the longer body length fits your machine.
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