The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X30-30 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. Ø40mm bore, 30mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X30-30 is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap screw lets you shorten the effective stroke by up to 30 mm, making it easy to fine-tune end positions during commissioning or format changes without swapping the cylinder. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, using a 16 mm diameter piston rod with an M12x1.25 thread.
This adjustable-stroke model shares the same force and envelope as the fixed-stroke SC series but adds a 30 mm adjustment range. The body length A(SCJ) is 185 mm, and it includes a 21 mm air cushion to decelerate the piston smoothly. The standard PT1/4 port and TPU seals suit general industrial air service from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X30-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 30 mm |
| Stroke adjustment | Up to 30 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. |
| ×30 | 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 end-of-stroke position during machine commissioning without removing the cylinder. The 30 mm rear screw adjustment lets technicians dial in the exact stop point for grippers, clamps, or ejectors.
Quickly adapt to different product sizes on packaging or assembly lines. Adjust the stroke end by up to 30 mm to accommodate varying box heights or part thicknesses without mechanical rework.
Take up mechanical wear in linkages or tooling over time. The adjustable stroke end lets operators restore precise positioning without replacing the cylinder, reducing downtime in high-cycle applications.
Choose the SCJ40X30-30 when you need to dial in the stroke end position on the machine. If the 628 N push force at 0.5 MPa is marginal, stepping up to a 50 mm bore (SCJ50) provides 982 N of push force. For applications that do not require stroke adjustment, the fixed-stroke SC40 series offers a simpler, slightly shorter body. The replacement match is an AirTAC SCJ adjustable-stroke cylinder of 40 mm bore, 30 mm nominal stroke, 30 mm adjust range, and PT port thread.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the single 16 mm rod reducing the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N.
A rear-cap adjusting screw sets the stroke end position within a 30 mm range; the nominal 30 mm stroke is the maximum. Pick the SCJ when you need to fine-tune the stroke on the machine. Choose the fixed-stroke SC40 if the stroke never changes, as it has a slightly shorter body and no adjustment mechanism.
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