The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X350-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 350mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X350-30S is a heavy-duty, double-acting single-rod pneumatic cylinder from AirTAC, engineered for applications demanding substantial force and field-adjustable stroke. With a 250 mm bore, it delivers a powerful 24544 N of push force at 0.5 MPa, making it suitable for large-scale pressing, clamping, and material handling. The rear-cap adjusting screw provides up to 30 mm of fine-tuning for the stroke end position, allowing operators to quickly dial in the exact stopping point for commissioning or format changes without dismounting the cylinder.
This model features a built-in magnet (suffix -S), enabling direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for precise, non-contact position feedback. The 50 mm diameter piston rod and PT1 inch ports ensure robust construction for demanding industrial environments. As an ISO 6430 class cylinder, it operates within a 0.15-1.0 MPa pressure range and uses a variable air cushion to decelerate the 350 mm stroke's end-of-travel motion smoothly.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X350-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 30 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -30 | 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 final pressing depth on a large hydraulic-style pneumatic press during initial setup. The 30 mm adjustment range allows engineers to dial in the exact stop position for consistent part forming without mechanical shims.
Adjust the stopping point of a heavy-duty pallet on a conveyor line. When switching between pallet sizes, the stroke end can be quickly modified via the rear screw to accommodate different lengths, eliminating the need for a fixed mechanical stop.
Compensate for the gradual wear of clamping jaws or tooling in a large assembly fixture. The adjustable stroke allows operators to incrementally extend the clamp's reach over time, maintaining consistent clamping force without replacing worn parts immediately.
Select the SCJ250X350-30S when your application requires a high-force actuator with the flexibility to fine-tune the stroke end on the machine. If the force requirement is lower, consider stepping down to the 200 mm bore SCJ, which provides 15708 N of push force at 0.5 MPa. For applications where the stroke length is fixed and will never need adjustment, a standard SC fixed-stroke cylinder is a more economical choice. For this 350 mm stroke, be mindful of side-loading on the 50 mm rod; using an external guide rail or switching to a guided cylinder assembly is recommended if the load is not perfectly axial to prevent rod bending and premature seal wear. A direct replacement must match the 250 mm bore, 350 mm nominal stroke, 30 mm adjust range, PT port thread, and the built-in magnet option.
Adjustable-stroke checklist
At 0.7 MPa operating pressure, this 250 mm bore cylinder generates a theoretical push force of 34361 N. The pull force on the return stroke is lower, at 23562 N, due to the area of the 50 mm piston rod. These forces are identical to a fixed-stroke SC cylinder of the same bore.
Yes, provided the mounting and porting match. The SCJ250X350-30S is a direct dimensional replacement for an AirTAC SCJ cylinder with the same bore, nominal stroke, and adjust range. It cannot replace a fixed-stroke SC model without verifying that the slightly longer body length for the adjusting screw mechanism fits your machine's envelope.
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