TAPPING SCREW – FLAT HEAD
DIN 7982 / ASME B18.6.3

Thread Type : Thread forming tapping screws are generally for application in materials where large internal stresses are permissible or desirable, to increase resistance to loosening.

CODE	SPEC (DIA)	SPEC (LENGTH)	HEAD DIA	HEAD HEIGHT	DRIVE	MATERIAL	FINISHING
STTSF	#0	1/4″ / 3/8″ / 1/2″	0.096-0.112	0.035	phillips / torx	Steel / Stainless Steel / Brass	Zinc Clear Trivalent Cr3+ / Passivated / Black Zinc Plated / Green Zinc Plated
STTSF	#2	1/4″ / 3/8″ / 1/2″	0.144-0.162	0.051	phillips / torx
STTSF	#4	1/4″ / 3/8″ / 1/2″ / 5/8″ / 3/4″ / 1″ / 1-1/4″ / 1-1/2″	0.191-0.212	0.067	phillips / torx
STTSF	#6	1/4″ / 3/8″ / 1/2″ / 5/8″ / 3/4″ /  7/8″ / 1″ / 1-1/4″ / 1-1/2″ / 1-3/4″ / 2″ / 2-1/2″ / 3″	0.238-0.262	0.083	phillips / torx
STTSF	#8	1/4″ / 3/8″ / 1/2″ / 5/8″ / 3/4″ /  7/8″ / 1″ / 1-1/4″ / 1-1/2″ / 1-3/4″ / 2″ / 2-1/2″ / 3″	0.285-0.312	0.100	phillips / torx
STTSF	#10	3/8″ / 1/2″ / 5/8″ / 3/4″ /  7/8″ / 1″ / 1-1/4″ / 1-1/2″ / 1-3/4″ / 2″ / 2-1/4″ / 2-1/2″ / 3″	0.333-0.362	0.116	phillips / torx
STTSF	#12	1/2″ / 5/8″ / 3/4″ /  7/8″ / 1″ / 1-1/4″ / 1-1/2″ / 1-3/4″ / 2″ / 2-1/2″ / 3″	0.380-0.412	0.132	phillips / torx
STTSF	#14	1/2″ / 5/8″ / 3/4″ /  7/8″ / 1″ / 1-1/4″ / 1-1/2″ / 1-3/4″ / 2″ / 2-1/2″ / 3″	0.442-0.477	0.153	phillips / torx
STTSF	M2.2	6.5/9.5/13/16	4-4.3	1.3	phillips / torx	Steel / Stainless Steel / Brass	Zinc Clear Trivalent Cr3+ / Passivated / Black Zinc Plated / Green Zinc Plated
STTSF	M2.9	6.5/9.5/13/16/19	5.2-5.5	1.7	phillips / torx
STTSF	M3.5	9.5/13/16/19/22/25	6.44-6.8	2.1	phillips / torx
STTSF	M3.9	9.5/13/16/19/22/25	7.14-7.5	2.3	phillips / torx
STTSF	M4.2	9.5/13/16/19/22/25/32	7.74-8.1	2.5	phillips / torx
STTSF	M4.8	9.5/13/16/19/22/25/32	9.14-9.5	3	phillips / torx
STTSF	M5.5	13/16/19/22/25/32/38	10.37-10.8	3.4	phillips / torx