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Recess Dimensions for Indented Hex Washer Head Screws，Type VI

ASME B 18.6.3 (T33-VI) - 2013

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Thread Size
d

10#

12#

14#

1/4

5/16

20#

24#

3/8

d
PP
M	Ref.
Socket No.
P	max
	min
s	max
	min
e	min
h	max
	min
d_c	max
	min
c	max
	min

0.1250	0.1380	0.1510	0.1640	0.1900	0.2160	0.2420	0.2500	0.3125	0.3200	0.3720	0.3750
40	32	/	32	24	24	/	20	18	/	/	16
0.111	0.132	0.132	0.155	0.178	0.200	0.221	0.221	0.266	0.266	0.312	0.312
T10	T15	T15	T20	T25	T27	T30	T30	T40	T40	T45	T45
0.050	0.055	0.055	0.070	0.075	0.085	0.100	0.100	0.120	0.120	0.145	0.145
0.040	0.045	0.045	0.055	0.060	0.070	0.085	0.085	0.105	0.105	0.130	0.130
0.188	0.250	0.250	0.250	0.312	0.312	0.375	0.375	0.500	0.500	0.562	0.562
0.181	0.244	0.244	0.244	0.305	0.305	0.367	0.367	0.489	0.489	0.551	0.551
0.202	0.272	0.272	0.272	0.340	0.340	0.409	0.409	0.545	0.545	0.614	0.614
0.070	0.093	0.093	0.110	0.120	0.155	0.190	0.190	0.230	0.230	0.295	0.295
0.058	0.080	0.080	0.096	0.105	0.139	0.172	0.172	0.208	0.208	0.270	0.270
0.260	0.328	0.328	0.348	0.414	0.432	0.520	0.520	0.676	0.676	0.780	0.780
0.240	0.302	0.302	0.322	0.384	0.398	0.480	0.480	0.624	0.624	0.720	0.720
0.025	0.025	0.029	0.031	0.031	0.039	0.050	0.050	0.055	0.055	0.063	0.063
0.015	0.015	0.017	0.019	0.019	0.022	0.030	0.030	0.035	0.035	0.037	0.037

①,A slight rounding of all edges and corners of the hex surfaces shall be permissible.
②,Fillet radius, R, at the junction of the sides of the hex and the top of the washer shall not exceed 0.15 times the basic screw diameter.
③,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
④,Sizes 7, 14, 20, and 24 are for tapping screws only.
⑤,The recess depths and penetration given are intended to include the depth of the indentation. Due to possible variations in the indentation depths, there could be variations in these dimensions. In these cases, the requirements are to be as agreed upon between the manufacturer and the purchaser.

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Similar Standards

1	[JIS] JIS B 1189 (Type 1) - 2014	Hexagon Bolt with flange (Collar) - Type 1 - [Table JA.2] View Suppliers
2	[JIS] JIS B 1189 (Type 1) - 2005	Hexagon Flange with flat upper face Bolt - Type 1 [Attached Table 1] View Suppliers
3	[JIS] JIS B 1189 (Class 1) - 1977	Hexagon bolts with collar - class 1 View Suppliers
4	[ASME] ASME B 18.6.3 (T32) - 2013	Plain and Slotted Hex Washer Head Screws [Table 32] (ASTM F837, F468)
5	[ASME] ASME B 18.6.3 (T33-I) - 2013	Cross Recess Dimensions for Indented Hex Washer Head Screws
6	[NF] NF E 27-711 - 1982	Hexagon Bolt with Collar
7	[AS] AS /NZS 1427 - 1996	ISO metric small series hexagon washer head screws