The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X125-100TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø80mm bore, 125mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X125-100 is a double-acting, single-rod pneumatic cylinder that puts fine stroke tuning directly in your hands. Its rear-cap adjusting screw provides a full 100 mm of adjustment range, letting you dial in the exact stroke end position from 25 mm up to the nominal 125 mm without swapping the cylinder or adding external hard stops. With a 25 mm piston rod and PT3/8 ports, this 80 mm bore unit delivers 2513 N of push force at 0.5 MPa, scaling up to 4523 N at 0.9 MPa.
This model is configured with a centre trunnion (TC) mount, which ships with the TCM1 bracket and allows the cylinder to pivot, making it ideal for applications where the load moves through an arc. The body length A(SCJ) is 239 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. It uses the default TPU seals and PT threads, suiting standard industrial environments from -20 to +70 °C.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X125-100TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -100 | 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.
Quickly adjust the push stroke for different box or carton sizes on a packaging line. The 100 mm adjustment range allows operators to change over between product formats in seconds by turning the rear screw, eliminating the need for mechanical stop changes.
Set a precise, repeatable clamping position for workpieces of varying thicknesses. The fine-thread adjusting screw lets you dial in the perfect clamping stroke end, preventing part damage while ensuring secure holding force from the 2513 N output.
The TC centre trunnion mount allows the cylinder to swing as it actuates a diverter gate on a conveyor. The adjustable stroke lets you fine-tune the gate's open position to perfectly align with different lane widths, all while the cylinder pivots smoothly on its trunnion.
Choose the SCJ80 bore when your application needs the 2513 N push force at 0.5 MPa that this 80 mm cylinder provides. If your force requirement is lower, stepping down to the 63 mm bore offers 1559 N of push, saving space and air consumption. For higher demands, the 100 mm bore jumps to 3927 N. The 100 mm adjustable range on this model is particularly useful during commissioning or for machines that run multiple product formats, as it allows rapid, tool-free stroke changes. For any application where the load must follow a perfectly straight line without any pivoting, consider the basic or FA flange mount instead of this TC trunnion configuration. At a 125 mm stroke, rod bending from side loads is minimal, but always ensure the load is guided externally if any lateral force is present.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 2513 N, and the pull force on the retract stroke is 2268 N. At the maximum operating pressure of 1.0 MPa, the push force reaches 5026 N. The pull force is lower because the 25 mm piston rod reduces the effective piston area on the rod side.
Yes, the SCJ80X125-100 is a direct dimensional replacement for an SC80X125, provided the slightly longer rear cap for the adjusting screw is accommodated. You must match the port thread (PT), mounting style (TC), and magnet option. The key benefit is gaining 100 mm of field-adjustable stroke, which the fixed SC model does not offer.
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