The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X70-50 is a double-acting, single-rod pneumatic cylinder that provides a field-adjustable stroke end via a rear-cap screw, allowing you to shorten the 70 mm nominal stroke by up to 50 mm without removing the cylinder from the machine. With a 20 mm diameter piston rod and PT1/4 ports, it delivers a push force of 1559 N at 0.5 MPa and a pull force of 1402 N, making it a robust choice for applications requiring on-the-fly end-position tuning.
This 63 mm bore actuator uses a tie-rod construction with an adjustable air cushion (28 mm cushion length) to decelerate the piston smoothly. The body length A(SCJ) is 197 mm, and the unit operates on 40 µm filtered air at pressures from 0.15 to 1.0 MPa. The 50 mm adjustment range is ideal for commissioning trials, format changeovers, or compensating for mechanical wear in clamping and pressing stations.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 50 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. |
| ×70 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm rear adjustment screw lets technicians dial in the exact stop position during machine commissioning without swapping cylinders or machining external hard stops, saving hours of setup time.
On packaging or sorting lines, operators can quickly adjust the stroke end to accommodate different box sizes or product heights, enabling a single machine to handle multiple SKUs with minimal downtime.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be periodically tweaked to compensate for pad wear or tooling compression, maintaining consistent clamp force without replacing the actuator.
Choose this SCJ63 model when you need the force capacity of a 63 mm bore—1559 N push at 0.5 MPa—but also require the flexibility to fine-tune the stroke end position. If your application demands higher force, stepping up to an 80 mm bore provides 2513 N of push force; for a lighter, more compact solution, the 50 mm bore delivers 982 N. If the stroke end never needs adjustment after initial setup, the fixed-stroke SC63 series offers a simpler, more cost-effective alternative.
For a drop-in replacement, match the 63 mm bore, 70 mm nominal stroke, 50 mm adjustment range (-50), PT thread, and basic mounting. This model can be upgraded with a built-in magnet (-S suffix) for use with CMSG/DMSG sensors, or fitted with a TC centre trunnion (F-SC63TC) for pivoting applications. For strokes of 300 mm or longer, evaluate side-loading on the 20 mm rod and consider adding an external guide rail to prevent rod bending.
Adjustable-stroke checklist
The push force at 0.5 MPa is 1559 N, and the pull force is 1402 N (due to the 20 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N. Always use the push stroke for primary work to utilize the full bore area.
You can if you need the adjustable stroke feature. The SCJ63X70-50 has the same 63 mm bore and 70 mm nominal stroke, but its body is slightly longer to house the rear adjusting screw. Ensure your mounting space can accommodate the 197 mm body length and that the 50 mm adjustment range suits your process.
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.