ASME B 18.6.5M (T11) - 2000 (R2010) Metric Type Ill Square-Recessed Flat Countersunk Head Tapping Screws [Table 11]

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Unit: 毫米(mm)

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For Nominal Thread Diameter

ST2.9

ST3.5

ST4.2

P	Pitch
d_s	max
d_s	min
d_k	max
d_k	min
k	max
L₁	max
L₁	min
r	max
r	min
s	Ref.
T	Ref.
b ^③	min
Socket No. ^②
t	max
t	min
Type of Thread and Point ^①

1	1.3	1.4
-	-	-
-	-	-
5.5	7.3	8.4
5.2	6.9	8
1.7	2.3	2.6
-	-	-
-	-	-
1.2	1.4	1.6
0.6	0.7	0.8
1.78	2.31	2.84
1.68	2.44	2.92
17	21	25
0	1S	2S
0.97	1.4	1.61
0.71	1.01	1.21
AB,B,BF,BT	AB,B,BF,BT	AB,B,BF,BT

①,Recessed head Types D, F, and T tapping screws shall have Style B head form. Recessed head Types AB, B, BF, and BT tapping screws shall have Style A head form. The underhead shoulder is mandatory on Style B head form, and all other head dimensions shall be common for both the Style A and Style B head forms.
②,S = short; R = regular
③,Suitable for long screws, while short screws are fully threaded

Alternative history ANSI/ASME B 18.6.5M - 2000(R2005) ANSI/ASME B 18.6.5M - 2000(R2010)

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