The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X85-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 85mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X85-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position by up to 20 mm via the rear-cap screw. With a 40 mm bore, it delivers 628 N of push force at 0.5 MPa and 1130 N at 0.9 MPa, making it a capable mid-range actuator for tasks that need a precise, repeatable stroke setting during commissioning or changeovers.
This model has an 85 mm nominal stroke, a 16 mm diameter piston rod with M12x1.25 threads, and PT1/4 ports. The adjustable air cushion decelerates the piston smoothly at both ends, and the body length A(SCJ) is 185 mm. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and suits speeds of 30-800 mm/s.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X85-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 85 mm |
| Stroke adjustment | Up to 20 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. |
| ×85 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Adjust the stroke end by up to 20 mm during initial machine setup to perfectly align the actuator with mating parts, eliminating the need to order multiple fixed-stroke cylinders for trial fits.
Quickly reset the stop position for different product sizes on packaging or sorting lines. The rear screw adjustment allows operators to change the stroke in seconds without dismounting the cylinder.
Take up mechanical play or tooling wear over time by slightly extending the effective stroke. This keeps clamping, pressing, or ejector functions consistent without reprogramming the machine controller.
Choose the SCJ40X85-20 when you need to dial in the stroke end on the machine without replacing the cylinder or adding external hard stops. If your force requirement grows, stepping up to a 50 mm bore provides 982 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. A direct replacement must match the 40 mm bore, 85 mm nominal stroke, 20 mm adjustment range, PT1/4 ports, and basic mounting. If you are using position-sensing switches, select the -S magnet option to mount CMSG/DMSG sensors directly on the barrel.
Adjustable-stroke checklist
At 0.5 MPa, it generates 628 N pushing and 528 N pulling. The maximum push force at the 1.0 MPa operating limit is 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
Yes, if you need the ability to fine-tune the stroke end. The SCJ40X85-20 matches the mounting and force of an SC40X85 but adds a rear adjusting screw. Ensure the 20 mm adjustment range and the slightly longer body length (185 mm) fit your available space.
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