衛生級焊接同心大小頭Size	A	D	D2
1.5″/1.0″	50.8	38.1	25.4
2.0″/1.0″	101.64	50.8	25.4
2.0″/1.5″	50.8	50.8	38.1
2.5″/1.5″	101.6	63.5	38.1
2.5″/2.0″	50.8	63.5	50.8
3.0″/1.5″	152.4	76.2	38.1
3.0″/2.0″	101.6	76.2	50.8
3.0″/2.5″	50.8	76.2	63.5
4.0″/2.0″	203.2	101.6	50.8
4.0″/2.5″	152.4	101.6	63.5
4.0″/3.0″	101.6	101.6	76.2
 
	Size	A	D	D2
1.5″/1.0″	39.0	38.1	25.4
2.0″/1.0″	57.0	50.8	25.4
2.0″/1.5″	39.0	50.8	38.1
2.5″/1.5″	57.0	63.5	38.1
2.5″/2.0″	39.0	63.5	50.8
3.0″/1.5″	74.0	76.2	38.1
3.0″/2.0″	57.0	76.2	50.8
3.0″/2.5″	39.0	76.2	63.5
4.0″/2.0″	95.0	101.6	50.8
4.0″/2.5″	78.0	101.6	63.5
4.0″/3.0″	60.0	101.6	76.2