鐵製大扁頭、皿頭粗牙機械螺絲

牙規			1/8"	5/32"	3/16"	1/4"
長度
3/16"	4.76	丸	◎
3/16"	4.76	皿	◎
1/4"	6.35	丸	◎	◎	◎
1/4"	6.35	皿	◎	◎	◎
5/16"	7.94		◎	◎	◎
3/8"	9.53		◎	◎	◎	◎
1/2"	12.70		◎	◎	◎	◎
5/8"	15.88		◎	◎	◎	◎
3/4"	19.05		◎	◎	◎	◎
7/8"	22.23		◎	◎	◎	◎
1"	25.40		◎	◎	◎	◎
1-1/4"	31.75		◎	◎	◎	◎
1-1/2"	38.10		◎	◎	◎	◎
1-3/4"	44.45		◎	◎	◎	◎
2"	50.80		◎	◎	◎	◎
2-1/2"	63.50			◎	◎	◎
3"	76.20			◎	◎	◎
牙規			5/16"
長度
1/2"	12.7		◎
5/8"	15.875		◎
3/4"	19.05		◎
7/8"	22.225		◎
1"	25.4		◎
1-1/4"	31.75		◎
1-1/2"	38.1		◎
1-3/4"	44.45		◎
2"	50.8		◎
2-1/2"	63.5		◎
3"	76.2		◎

• 一般為鍍鋅顏色

48 鐵螺絲螺帽