We produce carriage bolt, hex head bolt.

马车螺栓六角头螺栓。

What type of neck is under the head of a carriage bolts, a step bolt and an elevator bolt ?

马车螺栓，阶梯螺栓和电梯螺栓的颈是什么形状？

Carriage bolt (coach bolt) : Has a domed or countersunk head, and the shank is topped by a short square section under the head.

马车螺栓(螺栓教练)：有一个圆顶或沉头，而小腿是由简短根据头方节突破。

Produce and sell six head bolt, bolt, pairs of head bolt, carriage bolt the six flange, make screw up, get into tail screw, the whole tooth silk pole mainly.

主要生产和销售六角头螺栓、六角法兰面螺栓、双头螺栓、马车螺栓、组合螺钉、钻尾螺丝、全牙丝杆。

Stainless steel screw, hex bolt series: tighten screw, machine screw, nail screw, self-tapping screw, expansion bolts, carriage, lifting eyebolt, a tooth, flat mat, play split cotters cushion etc.

不锈钢螺丝系列：内六角螺栓，紧钉螺钉，机螺钉，自攻钉，马车螺丝，膨胀螺丝，吊环螺丝，牙条，开口销，平垫，弹垫等。