The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X125-100 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X125-100 is a double-acting, single-rod tie-rod cylinder that puts stroke-end tuning directly in your hands. Its rear-cap adjusting screw provides a full 100 mm of adjustment range on the 125 mm nominal stroke, letting you dial in the exact end position without swapping the cylinder or adding external hard stops. The 40 mm bore delivers 628 N of push force at 0.5 MPa and 1130 N at 0.9 MPa, while the 16 mm piston rod and 21 mm air cushion handle deceleration smoothly.
This model ships in a basic configuration with TPU seals, PT1/4 ports, and an M12x1.25 rod thread. The SCJ body length A measures 185 mm, making it a compact choice for machinery where space is limited but fine mechanical adjustment is needed during commissioning or format changes. The adjustable stroke feature only sets the stroke end position—it does not alter the cylinder's force output or speed capability.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X125-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 125 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. |
| ×125 | 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 commissioning, the 100 mm adjustment range lets technicians fine-tune the stroke end position on the fly. This eliminates the need to stock multiple fixed-stroke cylinders just for trial runs, speeding up the debug phase.
In clamping or pressing fixtures, tooling surfaces wear over time. The rear adjusting screw can be turned to take up the slack, restoring full clamp force without replacing the cylinder or machining new spacer blocks.
On packaging or sorting lines that handle different product sizes, operators can quickly adjust the SCJ40's stroke end to match a new box height or pallet dimension. The 100 mm range covers a wide variety of formats with a single actuator.
Choose the SCJ40X125-100 when you need to fine-tune the retract end position by up to 100 mm on a 40 mm bore platform. If your force requirement grows, stepping up to the 50 mm bore (SCJ50) raises push force to 982 N at 0.5 MPa. For applications that do not require field adjustment, the fixed-stroke SC40X125 reduces complexity and cost. A direct replacement must match the 40 mm bore, 125 mm nominal stroke, 100 mm adjust range, PT1/4 ports, and basic mounting. The SCJ mounting system accepts FA front flange, LB foot, or TC centre trunnion accessories (F-SC40FA, F-SC40LB, F-SC40TC) but does not offer FB flange or CA/CB clevis mounts.
Adjustable-stroke checklist
At 0.5 MPa, the 40 mm bore produces 628 N of push force and 528 N of pull force (the pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N.
Yes, this SCJ40X125-100 directly replaces any AirTAC SCJ40 cylinder with a 125 mm nominal stroke and 100 mm adjust range, provided the port thread (PT), mounting style, and magnet option match your original unit. Always verify the adjust range stamped on the original cylinder, as the -100 suffix is critical for dimensional interchangeability.
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