Maryland Metrics Technical Data Chart
DIAMETERS AND PITCHES FOR SELF TAPPING SCREWS

SHEET METAL SCREWS							SCREWS FOR PLASTICS
		FINE	COARSE	JIS(CLASS #)			ORIGINAL		DURO
ISO/USA	ST	(AB)	(A)	JIS(1)	JIS(2/4)	JIS(3)	EJOT	(PT)	DURO	(PT)
DIAM.	DIAM.	PITCH mm	PITCH mm	PITCH mm	PITCH mm	PITCH mm	DIAM.	PITCH mm	DIAM.	PITCH mm
-	1.8						K18	0.8
-	2				0.63	0.4
#2	2.2	1.26					K22	0.98	K22	0.71
-	2.5				0.91	0.45	K25	1.12	K25	0.77
#4	2.9	1.06
-	3			1.06	1.06	0.5	K30	1.34	K30	0.86
#6	3.5	1.27	1.41	1.41	1.27	0.6	K35	1.57	K35	0.95
#7	3.9		1.59
-	4			1.59	1.41	0.7	K40	1.79	K40	1.04
#8	4.2	1.41	1.69
-	4.5			1.81	1.59	0.75
#10	4.8	1.59	2.12
-	5			2.12	1.59	0.8	K50	2.24	K50	1.23
#12	5.5	1.81	2.31
-	6			2.54	1.81	1	K60	2.69	K60	1.42
#14	6.3	1.81	2.54
1/4"		1.81
-	7						K70	3.14
5/16"		2.12
-	8			2.82	2.12	1.25	K80	3.59	K80	1.79
3/8"		2.12
-	10						K100	4.49
#20			2.82
#24			2.82