Abstract: An apparatus for producing a stitched pile surface structure is disclosed. The apparatus has a plurality of transversely spaced needles forming a needle array, with each needle having a predetermined width dimension (142D). The needles in operation being movable to penetrate a backing at a plurality of needle penetration points as the backing is conveyed along a path of travel through the apparatus. A plurality of laterally adjacent sinker fingers extends forwardly in the direction of travel. Each needle is disposed laterally intermediate adjacent fingers. Each finger has a forward end thereon. The sinker fingers extend forwardly in the direction of travel past the needle penetration points, the height dimension of at least that portion of each finger that extends forwardly past the needle penetration points being uniform. In addition, the fingers have a base region, with adjacent fingers being spaced from each other by a lateral spacing distance (132) not greater than 1.