The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 40 mm adjustment range via a rear-cap screw. This 63 mm bore model delivers a push force of 1559 N at 0.5 MPa and up to 2805 N at 0.9 MPa, making it a robust solution for applications where the stroke length must be fine-tuned during commissioning or changeovers without swapping the cylinder.
The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the tie-rod barrel for precise end-of-stroke detection. With a 20 mm piston rod, PT1/4 ports, and a 28 mm air cushion, this genuine AirTAC cylinder is designed for reliable, repeatable performance in dynamic industrial environments.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 40 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm rear adjustment screw allows engineers to precisely dial in the stroke end position during machine setup, eliminating the need to shim or reposition external stops for a perfect fit.
Ideal for packaging or assembly lines that process different product sizes, the adjustable stroke can be quickly reset to accommodate new formats without mechanical disassembly, reducing downtime.
In clamping or pressing operations, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent process force and quality without replacing the actuator.
Choose the SCJ63 series when you need a mid-range force output and the ability to trim the stroke end by up to 40 mm on the machine. If your application demands higher force, stepping up to the SCJ80 bore provides 2513 N of push force at 0.5 MPa. For applications that do not require stroke adjustability, a fixed-stroke SC63 cylinder is a simpler, more cost-effective alternative. A direct replacement must match the 63 mm bore, 125 mm nominal stroke, 40 mm adjust range, PT port thread, and the built-in magnet. For this 125 mm stroke, side-load forces are typically manageable, but if the rod is subjected to significant radial loads, consider an external guide rail or a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa. The pull force is slightly lower at 1402 N at 0.5 MPa due to the area of the 20 mm piston rod, which is a characteristic of all single-rod cylinders.
You can, provided the 125 mm nominal stroke and 40 mm adjust range suit your application. The SCJ body is slightly longer than a fixed-stroke SC to house the adjusting screw. Ensure the mounting style, port thread (PT), and magnet option match your existing setup for a direct physical and functional replacement.
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