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Hexagon Socket Button Head Cap Screws [Table 11] (ASTM F835 / F879)

ASME B 18.3 (T11) - 2012

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Nominal Diameter
d

d	Nominal Diameter
PP	UNC
	UNF
	UNEF
d_k	max
	min
d_a	max
	min
k	max
	min
s	Nominal Size
t	min
L ^①	Maximum standard length	Nominal Size
c	Ref.

0.06	0.073	0.086	0.099	0.112	0.125	0.138	0.164
-	64	56	48	40	40	32	32
80	72	64	56	48	44	40	36
-	-	-	-	-	-	-	-
0.114	0.139	0.164	0.188	0.213	0.238	0.262	0.312
0.104	0.129	0.154	0.176	0.201	0.226	0.25	0.298
0.080	0.093	0.106	0.119	0.132	0.145	0.158	0.194
0.070	0.083	0.096	0.109	0.122	0.135	0.148	0.184
0.032	0.039	0.046	0.052	0.059	0.066	0.073	0.087
0.026	0.033	0.038	0.044	0.051	0.058	0.063	0.077
0.035	0.05	0.05	0.062	0.062	0.078	0.078	0.094
0.02	0.028	0.028	0.035	0.035	0.044	0.044	0.052
0.5	0.5	0.5	0.5	0.5	0.5	0.63	0.75
0.010	0.010	0.010	0.010	0.015	0.015	0.015	0.015

Nominal Diameter
d

10#

1/4

5/16

3/8

7/16

1/2

5/8

3/4

d	Nominal Diameter
PP	UNC
	UNF
	UNEF
d_k	max
	min
d_a	max
	min
k	max
	min
s	Nominal Size
t	min
L ^①	Maximum standard length	Nominal Size
c	Ref.

0.19	0.25	0.3125	0.375	0.4375	0.5	0.625	0.75
24	20	18	16	14	13	11	10
32	28	24	24	20	20	18	16
-	32	32	32	28	28	24	20
0.361	0.437	0.547	0.656	0.765	0.875	1	1.125
0.347	0.419	0.527	0.636	0.746	0.851	0.97	1.105
0.220	0.290	0.353	0.415	0.478	0.560	0.685	0.740
0.210	0.280	0.343	0.405	0.468	0.540	0.665	0.720
0.101	0.132	0.166	0.199	0.231	0.265	0.331	0.375
0.091	0.122	0.152	0.185	0.218	0.245	0.311	0.355
0.125	0.156	0.188	0.219	0.25	0.312	0.375	0.437
0.07	0.087	0.105	0.122	0.14	0.175	0.21	0.245
1	1	1	1.25	1.5	2	2	2.5
0.020	0.031	0.031	0.031	0.031	0.046	0.062	0.062

①, This product is designed and recommended for light fastening applications such as guards, hinges, etc. It is not suggested for use in critical high strength applications where socket head cap screws should normally be used.
②,For screws of nominal lengths equal to or shorter than standard maximum lengths, L, listed in this Table, the complete (full-form) threads, measured with a thread ring gage having the thread chamfer and/or counterbore removed, shall extend to within two pitches (threads) of the bearing surface of the head. For longer screws, the length of the complete thread shall, at the option of the manufacturer, be between the minimum limit of twice the basic screw diameter plus 0.50 in. and the maximum limit within two pitches (threads) of the head. The unthreaded portion of the screw shall be at nominal diameter. The tolerance on the unthreaded portion (body diameter) of the screw shall be the same as Body Diameter, Hexagon Socket Head Cap Screws
③,Threads shall be Unified external threads with radius root: Class 3A UNRC and UNRF Series. Copyright ASME International Acceptability shall be based on System 22, ASME B1.3. Class 3A does not provide a plating allowance.

Alternative history

ASME B 18.3 - 2003(R2008) ASME B 18.3 - 2012

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Similar Standards

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