内循环构造的优点，使螺帽外径为精巧的圆周型，因此适合内部空间较小的机器。 需要注意的是内循环滚珠丝杆的丝杆轴必须有一端是完全牙，且该端的肩部直径必须小于丝杆轴外径，否则无法组装螺帽。
型号 4R[16,20,25,32,40,50,63,80,100]-[5,6,8,10,12,16,20][T3,T4,T5,T6]-[,2][R][S][I][C]-[1-1000/1]-[1-1500/1]-[0.035,0.005,0.007,0.008,0.012,0.018,0.025,0.05,0.21][A,S]
