20
十字穴半头螺钉
Phillips oval head

21
割沟半沉头螺钉
Slotted oval head

22
割沟圆头螺钉
Slotted round head

23
看不清楚(不知是不是两种穴组合)
Combination round head

24
看不清楚(不知是不是两种穴组合)
Combination truss head

25
十字穴大扁头螺钉
Phillips truss head

26
割沟大扁头攻牙螺钉
Slotted truss head

27
割沟六角凸缘F牙螺丝
Hex slotted washer head thread cutting screw type F

28
圆头方劲螺钉(马车螺丝)
A bolt mostly used in wood with a domed top and a square under the head.

29
六角头木螺丝
Often called a lag screw. Hex lag bolts are for fastening in wood.

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