沉头 chou dou ,重庆宜昌等地方言，意思是 清楚，明白；形容衣着干净整齐 例句：1，很多人对这个事都搞不沉头。意思是很多人都弄不明白。 2，你今天的穿着好沉头。
半沉头 Oval ; Oval Head OL HD
沉头带榫螺栓 Flat counter sunk nib bolts ; Flat countersunk nib bolts
沉头方颈螺栓 Flat countersink square neck bolts ; Plough bolt ; Flat counter sunk square neck bolts ; countersunk head square neck bolt
沉头螺栓 countersunk screw ; Countersunk head screw ; Plow Bolts
沉头螺钉 Sunk Screw ; countersunk rivet ; Countersunk head screws ; flathead screw
十字槽沉头机丝牙螺钉 Cross recessed countersunk head screw
沉头铆钉 Countersunk head rivets ; countersunk rivet ; Countersunk head rivets-Black
半沉头铆钉 Oval countersunk head rivets ; raised contersunk head rivets ; Oval countersunk head rivets-Black ; oval countersunk head rivet
内六角沉头螺钉 Hexagon socket countersunk head screws ; socket countersunk head screws ; Countersunk Head Screws ; hexagon socket countersunk flat cap head screw
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