The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X140-30S 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. Ø40mm bore, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X140-30S is a 40 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides 30 mm of field-adjustable stroke-end reduction. At 0.5 MPa it delivers 628 N push and 528 N pull, making it a capable mid-range actuator for tasks that need fine positional tuning without swapping hardware.
The built-in magnet (-S suffix) lets CMSG/DMSG/EMSG sensors clamp directly onto the tie-rod barrel for non-contact position sensing. With a 16 mm rod, PT1/4 ports, and a 21 mm air cushion, this model shares the 1200 mm max standard stroke of the 40 bore family, and its SCJ body length is 185 mm plus stroke.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X140-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 140 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. |
| ×140 | 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.
The 30 mm screw adjustment lets technicians dial in the exact stroke end during machine setup, eliminating the need to shim or swap cylinders when a hard stop position shifts slightly.
On packaging or assembly lines that run multiple product sizes, the adjustable stroke quickly adapts the pusher or stop position to a new format without mechanical rework.
As tooling or gripper pads wear over time, the stroke-end screw can be advanced to compensate for the lost material, maintaining consistent contact pressure and cycle time.
Choose the SCJ40 bore when 628 N push at 0.5 MPa fits the load; if you need more force, the SCJ50 bore delivers 982 N push at the same pressure. For applications that don't require stroke-end adjustment, the fixed-stroke SC40 is a simpler alternative. This SCJ40X140-30S is a direct replacement for any AirTAC SCJ40 with a 140 mm nominal stroke, 30 mm adjust range, PT ports, basic mounting, and a magnet. At 140 mm stroke, rod bending is not a primary concern for this bore, but always align the load to avoid side forces.
Adjustable-stroke checklist
At 0.5 MPa air pressure the cylinder produces 628 N pushing force and 528 N pulling force. At the maximum operating pressure of 1.0 MPa, push force reaches 1130 N. The pull force is lower because the single rod reduces the piston area on the return stroke.
Yes, because this model has the -S magnet option. The built-in magnet on the piston allows standard AirTAC CMSG, DMSG, or EMSG reed and solid-state sensors to mount directly on the barrel for end-of-stroke or mid-stroke position detection.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.