AirTAC PTBR Series Single-Acting Front-Mount Pen-Size Cylinders

PTBR is AirTAC's single-acting, air-retract pen cylinder in the PB family, built to the JIS standard in five bores: 6, 8, 10, 12 and 16 mm. It has one working port (M5x0.8) on the rear cover: pressurised air pulls the rod IN, and the internal spring pushes it back OUT. With no air applied, the rod sits extended - the opposite behaviour to the PSBR (air-extend, spring-retract). Choose PTBR when the de-energised state must have the rod OUT. One rule governs its use: because the spring makes the return stroke, the extend direction must not carry a load.

The front cover carries its own threaded mounting holes, so the cylinder bolts directly to the machine, top-down or bottom-up, with no FA flange, LB bracket or CJ foot to buy or fit - this is the reason to pick PTBR over the plain PTB, which needs a separate mounting accessory. The piston rod and barrel are stainless steel, so the cylinder copes with generally corrosive working environments, and the accurate rod guide runs on a bearing that needs no added lubricating oil. Cushioning is a fixed anti-collision pad, not adjustable air cushioning. Supply pressure is 0.3-0.7 MPa or 0.2-0.7 MPa depending on bore - confirm the window for your bore from the datasheet. Speed range is 50-800 mm/s, temperature -20 to +70 C, and the air must be filtered to 40 um or finer.

Strokes follow the bore: 5-60 mm for bores 6, 8 and 10; up to 75 mm on bore 12; and up to 100 mm on bore 16. The ordering code is PTBR{bore}X{stroke}[S]R, where S adds a magnet for CMSG, DMSG or EMSG position switches - the magnet is optional, not standard. The rear cover is R (axial inlet) only; the radial-inlet U option exists solely on the double-acting PBR. Front and rear covers cannot be dismantled, so the cylinder is treated as a sealed unit. Note also that the 8 mm bore is offered in this front-mount group but not in the standard-mount PB group, making PTBR one of the few places to get it.