内六角圆柱头螺钉

• 冂(outer boundary; fence)RADICAL
• 入(enter; go in)ASSOCIATIVE

Inside a fence, something that has already gone in becomes what is enclosed.

• 亠(lid; cover)ASSOCIATIVE
• 八(eight; divide in two)ASSOCIATIVE

The numeral six like a roof placed over two strokes represents balanced division.

• ⺈(blade (upper part); blade edge (top))ASSOCIATIVE
• 用(use; employ)ASSOCIATIVE

A sharp horn like a knife blade is used for stabbing, resembling the pointed horn of an animal.

• 囗(encircling ring; surrounding loop)RADICAL
• 员(member)PHONETIC

A circle is a shape that is completely enclosed and closed like a member held within embracing arms.

• 大(large; big)RADICAL
• ⺀(two dots indicating hair; top of head)ASSOCIATIVE

The head is the largest and most prominent part on the human body.

• 釒(metal)RADICAL
• 丁(stalwart; able-bodied man)PHONO-SEMANTIC

A nail is a metal object with a firm shape like a sturdy strong man.