The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-20 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-20 is a double-acting, single-rod pneumatic cylinder from AirTAC, designed for applications where the stroke end position requires fine-tuning on the machine. Its rear-cap adjusting screw provides up to 20 mm of retraction from the nominal 250 mm stroke, allowing operators to dial in the exact stopping point without changing the cylinder or adding external hard stops. With a 20 mm rod diameter and PT1/4 ports, it delivers a push force of 1559 N at 0.5 MPa.
This tie-rod cylinder features an adjustable air cushion (28 mm length) for smooth deceleration and operates reliably between 0.15 and 1.0 MPa. The body length A is 197 mm, making it a compact choice for its force class. It is suited for commissioning trials, format changeovers, and any process where the stroke end needs periodic adjustment to account for tooling wear or product variation.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 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. |
| ×250 | 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 stroke end during machine commissioning to perfectly align with downstream tooling, eliminating the need to shim or reposition the entire cylinder.
Quickly adjust the stroke end to accommodate different product sizes on a packaging line, reducing changeover time between batches without replacing the actuator.
Periodically tweak the stroke end to compensate for gradual wear on gripper pads or contact surfaces, maintaining consistent clamping force and part registration over the cylinder's service life.
Choose the SCJ63 when your application needs around 1559 N of push force at standard shop air. If you require more force, stepping up to the 80 mm bore provides 2513 N of push at the same 0.5 MPa pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC63 fixed-stroke cylinder is a more economical alternative. This model is a direct replacement for any AirTAC SCJ63X250-20 with PT ports and basic mounting; ensure the 20 mm adjust range matches your machine's setup requirements. For a 250 mm stroke, be mindful of side loads—if the rod is not guided externally, consider adding a guide rod or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. Because this is a single-rod cylinder, the push force is greater than the pull force due to the area of the 20 mm rod. The maximum push force at the 0.9 MPa operating limit is 2805 N.
A screw in the rear end cap acts as an internal stop for the piston, allowing you to shorten the retract stroke by up to 20 mm from the nominal 250 mm. This sets the stroke end position mechanically; it does not adjust the extend stroke, force, or speed. The cylinder must be ordered with the full nominal stroke you require as a maximum.
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.