The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-20 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. Ø63mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X120-20 is a double-acting, single-rod pneumatic cylinder that provides a nominal 120 mm stroke, field-adjustable by up to 20 mm via a rear-cap screw. This 63 mm bore unit delivers 1559 N of push force at 0.5 MPa, making it a robust choice for applications requiring fine end-position tuning without replacing the cylinder.
With a 20 mm rod, PT1/4 ports, and a 28 mm air cushion, the SCJ63X120-20 balances compact tie-rod construction with reliable deceleration. The body length A is 197 mm, and the adjustable stroke end is ideal for commissioning, format changes, or taking up mechanical wear on the fly.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×120 | 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.
Fine-tune the retract or extend end position by up to 20 mm during initial machine setup, eliminating the need for precision-machined external stops.
On packaging or material handling lines, the adjusting screw can quickly take up slack from worn tooling or pads, maintaining consistent product contact.
Adjust the stroke end to accommodate different product sizes or tooling setups in a multi-format machine without swapping the cylinder.
Select the SCJ63X120-20 when your application needs around 1560 N of push force and the ability to fine-tune the stroke end by up to 20 mm. If you require more force, stepping up to an 80 mm bore provides 2513 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC63X120 is a simpler alternative.
This model is a direct replacement for another AirTAC SCJ63X120-20 with basic mounting, PT threads, and no magnet. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at the 0.9 MPa operating limit is 2805 N.
A screw in the rear cap limits the piston's stroke end. Turning it shortens the effective stroke by up to 20 mm from the nominal 120 mm maximum, allowing on-machine fine-tuning.
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.