The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-100S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X300-100S brings field-adjustable stroke control to a 40 mm bore double-acting cylinder, with a nominal 300 mm maximum stroke and a generous 100 mm rear-screw adjustment range. Its 16 mm diameter single rod delivers 628 N of push force at 0.5 MPa and up to 1130 N at 0.9 MPa, while the pull side provides 528 N at 0.5 MPa. The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable end-of-stroke detection.
This model uses a PT1/4 port, an M12x1.25 rod thread, and a 21 mm air cushion for smooth deceleration. The body length A(SCJ) is 185 mm, making it a compact choice for space-constrained stations where the stroke end must be fine-tuned during commissioning or format changeovers. It is a genuine AirTAC component, backed by full traceability.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
The 100 mm adjustment range lets technicians fine-tune the push stroke endstop for a 40 mm bore actuator during initial machine setup, eliminating the need for shims or custom hard stops.
On a packaging line, the SCJ40X300-100S can have its stroke incrementally shortened via the rear screw to compensate for wear on a contact pad, maintaining precise placement without immediate part replacement.
When a machine switches between product sizes, operators can quickly adjust the cylinder's 300 mm maximum stroke down by up to 100 mm to match a new tooling position, speeding up the changeover process.
Choose the SCJ40X300-100S when you need to dial in a 300 mm stroke end on the machine without swapping cylinders. If the 628 N push force at 0.5 MPa is marginal, stepping up to a 50 mm bore (SCJ50, 982 N push) adds force while keeping the same PT1/4 port. For applications needing a fixed, non-adjustable stroke, the standard SC40X300 is a simpler alternative. At 300 mm of stroke, be mindful of side loads on the 16 mm rod; if the load is not guided, add an external guide rail or consider a guided cylinder to prevent rod bending.
As a direct replacement, match this model to another AirTAC SCJ40X300-100S with a PT port, basic mounting, and the -S magnet option. The F-SC40LB foot mount or F-SC40FA front flange can be added if a bracket is needed later.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it produces 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
Yes, if the extra body length for the adjusting screw is acceptable. The SCJ40X300-100S shares the same 40 mm bore, PT1/4 port, and mounting accessories. You gain a 100 mm adjustable stroke-end range, which is useful for fine-tuning the position without swapping the cylinder.
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