Material

ASME B 18.6.3 - 2013 82° Dimensions of Flat Coutersunk Trim head Screws [table 13]

Unit: inch

美标ASME B18.6.3 - 2013 ASME18.6.3 18.6.3A 82° Dimensions of Flat Coutersunk Trim head Screws [table 13]

Thread Size
d

10#

12#

d	Nominal Size
PP	UNC
Code	Head Size
d₁	max
	min
	Type A)	min
	Other types	min
d_k	max
	min
k	Ref

0.1120	0.1250	0.1380	0.1380	0.1640	0.1640	0.1900	0.2160
40	40	32	32	32	32	24	24
3	4	4	5	5	6	8	8
0.112	0.125	0.138	0.138	0.164	0.164	0.190	0.216
0.106	0.119	0.131	0.131	0.157	0.157	0.181	0.207
0.105	0.118	0.131	0.131	0.157	0.157	0.183	0.209
0.106	0.119	0.131	0.131	0.157	0.157	0.181	0.207
0.187	0.212	0.212	0.237	0.237	0.262	0.312	0.312
0.167	0.191	0.191	0.215	0.215	0.238	0.285	0.285
0.052	0.060	0.052	0.068	0.052	0.069	0.085	0.069

Thread Size
d

12#

14# ^④

1/4

5/16

3/8

d	Nominal Size
PP	UNC
Code	Head Size
d₁	max
	min
	Type A)	min
	Other types	min
d_k	max
	min
k	Ref

0.2160	0.2420	0.2420	0.2500	0.2500	0.3125	0.3125	0.3750
24	-	-	20	20	18	18	16
10	10	12	10	12	12	1/4	5/16
0.216	-	-	0.250	0.250	0.312	0.312	0.375
0.207	-	-	0.240	0.240	0.302	0.302	0.364
0.209	0.235	0.235	-	-	-	-	-
0.207	-	-	0.240	0.240	0.302	0.302	0.364
0.362	0.362	0.412	0.362	0.412	0.412	0.477	0.597
0.333	0.333	0.380	0.333	0.380	0.380	0.442	0.556
0.101	0.080	0.112	0.080	0.112	0.075	0.116	0.155

①,Edge of head may be rounded or flat.
②,Short machine screws include nominal lengths up to and including 1 1/8 in. for sizes No.5 and smaller, and 2 in. for sizes No.6 and larger.
③,Short tapping screws are those threaded full length. Refer to para. 4.3 for applicable screw lengths.
④,Size 14 is for tapping screws only.
⑤,Maximum diameter shall not exceed minimum plus 0.011 in. for Type A tapping screws, and basic screw diameter for all other tapping screw types.

Similar Standards

1	[GB] GB /T 819.1 - 2016	Countersunk Flat Head Screws With Cross Recess—Part 1: Property Class 4.8 Suppliers(5)
2	[GB] GB /T 819.2 - 2016	Countersunk Flat Head Screws With Cross Recess—Part 2: Property Class 8.8, Stainless Steel Screws And Non-ferrous Metal Screws Suppliers(5)
3	[GB] GB /T 819.1 - 2000	Cross recessed countersunk head screws Suppliers(5)
4	[GB] GB /T 819.2 - 1997	Cross Recessed Countersunk Flat Head Screws (Common Head Style) - Grade A - Part 2: Steel Of Property Class 8.8, Stainless And Non-Ferrous Metals Suppliers(5)
5	[GB] GB /T 13806.1 (B) - 1992	Cross Recessed Countersunk Screws For Fine Mechanics
6	[GB] GB 819 - 1985	Cross Recessed Countersunk Head Screws Suppliers(5)
7	[GB] GB 819 - 1976	Cross recessed countersunk head screws Suppliers(5)
8	[DIN] DIN 965 - 1990	Cross Recessed Countersunk Head Screws Suppliers(6)
9	[DIN] DIN 34811 - 1999	Plastic Flat Head Screws With Cross Recess
10	[ISO] ISO 7046-2 - 2011	Countersunk Flat Head Screws(Common Head Style) With Type H Or Type Z Cross Recess-Product Grade A-Property Class 8.8 Suppliers(1)
11	[ISO] ISO 7046-2 - 1990	Cross Recessed Countersunk Flat Head Screws(common Head Style) - Grade A - Steel Of Property Class 8.8,stainless Steel And Nonferrous Metals Suppliers(1)
12	[ISO] ISO 7046-1 - 2011	Countersunk Flat Head Screws(Common Head Style)With Type H Or Type Z Cross Recess- Product Grade A-Steel Screws Of Property Class 4.8
13	[ISO] ISO 7046-1 - 1994	Cross recessed countersunk head screws
14	[JIS] JIS B 1111 - 2017	Cross Recessed Countersunk Head Screws - Class 4.8
15	[JIS] JIS B 1111 - 2017	Cross Recessed Countersunk Head Screws - Class 8.8
16	[JIS] JIS B 1111 - 2017	Cross Recessed Countersunk Head Screws
17	[JIS] JIS B 1111 - 2006	Cross Recessed Countersunk Head Screws - Class 4.8
18	[JIS] JIS B 1111 - 2006	Cross Recessed Countersunk Head Screws - Class 8.8
19	[JIS] JIS B 1111 - 1996	Cross recessed countersunk head screws-Class 8.8
20	[JIS] JIS B 1111 - 1996	Cross recessed countersunk head screws-Class 4.8
21	[ANSI/ASME] ANSI/ASME B 18.6.7M - 1998	Metric cross recessed countersunk screws
22	[ANSI/ASME] ANSI/ASME B 18.6.7M - 1998	Metric PZ Drives countersunk head screws
23	[ANSI/ASME] ANSI/ASME B 18.6.3 - 2013	Recess dimensions for Flat Countersunk Trim Head Screws
24	[EN] EN 4162 - 2016	Aerospace Series-Screws 100° Countersunk Normal Head, Offset Cruciform Recess, Coarse Tolerance Normal Shank, Medium Length Thread, In Alloy Steel, Cadmium Plated - 1100 MPa (At Ambient Temperature)/235 °C
25	[EN] EN 4162 - 2009	Aerospace Series-Screws 100° Countersunk Normal Head, Offset Cruciform Recess, Coarse Tolerance Normal Shank, Medium Length Thread, In Alloy Steel, Cadmium Plated - 1100 MPa (At Ambient Temperature)/235 °C
26	[UNI] UNI 7688 - 1977	Cross Recessed Countersunk Head Screws
27	[NF] NF E 25-119-1 - 1994	Countesunk Flat Head Screws,with Type H Or Type Z Cross Recessed - Product Grade A, Class 4.8
28	[NF] NF E 25-119-2 - 1994	Cross Recessed Countersunk Head Screws - Grade A, Class 8.8
29	[BS] BS 1981 - 1991	Recessed Truncated Countersunk Head Screws:short Length
30	[BS] BS 1981 - 1991	Recessed Truncated Countersunk Head Screws: Long Length
31	[BS] BS 450 - 1958	Cross Recessed Countersunk Head Screws
32	[AS] AS /NZS 1427 - 1996	ISO metric cross-recess countersunk screws
33	[CNS] CNS 4560 - 1981	Cross Recessed Countersunk Head Screws
34	[KS] KS B 1023 - 2001	Cross Recessed Countersunk Head Screws - Class 4.8
35	[KS] KS B 1023 - 2001	Non-ferrous Metal Cross Recessed Countersunk Head Screws - Class 8.8
36	[DIN EN ISO] DIN EN ISO 7046 (-1) - 2011	Countersunk Flat Head Screws (Common Head Style) with Type H or Type Z Cross Recess - Product Grade A - Part 1: Steel Screws of Property Class 4.8 Suppliers(6)
37	[DIN EN ISO] DIN EN ISO 7046 (-2) - 2011	Countersunk Flat Head Screws(common Head Style) With Type H Or Type Z Cross Recess-product Grade A-property Class 8.8 Suppliers(5)