简体 | 繁體 | FastenerExpo |
English Deutsch Français 日本語 Italiano Español 한어 Português Русский بالعربية Türkçe
All Categories

Click Specification

Unit:inch

Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws

ASME/ANSI B 18.6.3 (T43) - 2013

Display drawing:

美标ASME/ANSI B18.6.3 (T43) - 2013 ASME/AN Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws
Screw Thread
d
0# 1# 2# 3# 4# 5# 6# 7#
PP Threads per in.
D Nominal Diameter
max
min
d max
min
P Ref.
S Point Taper Length /max
Point Taper Length /min
L 90-deg Heads /min
CsK. Heads /min
48 42 32 28 24 20 20 19
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510
0.060 0.075 0.088 0.101 0.114 0.130 0.139 0.154
0.054 0.069 0.082 0.095 0.108 0.123 0.132 0.147
0.036 0.049 0.064 0.075 0.086 0.094 0.104 0.115
0.033 0.046 0.060 0.071 0.082 0.090 0.099 0.109
0.031 0.044 0.058 0.068 0.079 0.087 0.095 0.105
0.042 0.048 0.062 0.071 0.083 0.100 0.100 0.105
0.031 0.036 0.047 0.054 0.063 0.075 0.075 0.079
1/8 1/8 5/32 3/16 3/16 7/32 1/4 1/4
1/8 5/32 3/16 7/32 1/4 9/32 9/32 5/16
Screw Thread
d
8# 10# 12# 1/4 5/16 3/8 7/16 1/2
PP Threads per in.
D Nominal Diameter
max
min
d max
min
P Ref.
S Point Taper Length /max
Point Taper Length /min
L 90-deg Heads /min
CsK. Heads /min
18 16 14 14 12 12 10 10
0.1640 0.1900 0.2160 0.2500 0.3125 0.3750 0.4375 0.5000
0.166 0.189 0.215 0.246 0.315 0.380 0.440 0.504
0.159 0.182 0.208 0.237 0.306 0.371 0.429 0.493
0.122 0.141 0.164 0.192 0.244 0.309 0.359 0.423
0.116 0.135 0.157 0.185 0.236 0.299 0.349 0.413
0.112 0.130 0.152 0.179 0.230 0.293 0.343 0.407
0.111 0.125 0.143 0.143 0.167 0.167 0.200 0.200
0.083 0.094 0.107 0.107 0.125 0.125 0.150 0.150
9/32 5/16 11/32 3/8 15/32 17/32 5/8 11/16
11/32 3/8 7/16 1/2 19/32 11/16 25/32 27/32
①,Point of screws shall be tapered and fluted or slotted as illustrated above for the respective types. The flute on Type BT screws shall have an included angle of 90 deg to 95 deg and the thread cutting edge located above the axis of screws. Tapered threads shall have unfinished crests, and the flutes or slots shall extend through first full form thread beyond taper except for Type BF screws on which tapered threads may be comlete at manufacturer's option and flutes may be one pitch short of first full form thread. Other details of taper and flutes design shall be optional with the manufacturer provided the screws meet the specified performance requirements.
②,The width of flat at crest of thread shall not exceed 0.004 in. for sizes up to and including No.8, and 0.006 in. for large sizes.

Alternative history

ANSI/ASME B 18.6.3 - 2010 ANSI/ASME B 18.6.3 - 2010 ANSI/ASME B 18.6.3 - 2013
Send Inquiry

Similar Standards

1 Fasteners—Hexagon products—Widths across flats [ISO]
ISO 272 - 1982 		Fasteners—Hexagon products—Widths across flats
2 Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T44) - 2013 		Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws
3 Rivet shank diameters [ISO]
ISO 1051 - 1999 		Rivet shank diameters
4 Recess Dimensions for Type I Nonindented Regular and Large Hex Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T31) - 2013 		Recess Dimensions for Type I Nonindented Regular and Large Hex Head Screws
5 Type D,F,G and Type T Thread Cutting Tapping Screws [Table 8] [ASME]
ASME B 18.6.4 (D/F/G/T) - 1998 		Type D,F,G and Type T Thread Cutting Tapping Screws [Table 8]
6 Countersunk head screws - Head configuration and gauging [EN]
EN 27721 - 1991 		Countersunk head screws - Head configuration and gauging
7 Recess Dimensions for Undercut 82-deg Flat Countersunk Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T10) - 2013 		Recess Dimensions for Undercut 82-deg Flat Countersunk Head Screws
8 Recess dimensions for Flat Countersunk Trim Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T14) - 2013 		Recess dimensions for Flat Countersunk Trim Head Screws
9 Thread ends and lengths of projection of bolt ends for metric ISO threads according to DIN 13 [DIN]
DIN 78 - 1983 		Thread ends and lengths of projection of bolt ends for metric ISO threads according to DIN 13
10 Fasteners—Bolts,screws and studs—Split pins holes and wire holes [ISO]
ISO 7378 - 1983 		Fasteners—Bolts,screws and studs—Split pins holes and wire holes
11 Dimensions of Alternate Styles of Points for Thumb and Wing Screws [ASME/ANSI]
ASME/ANSI B 18.17 - 1968 (R1983) 		Dimensions of Alternate Styles of Points for Thumb and Wing Screws
12 Knurle [DIN]
DIN 82 - 1973 		Knurle
13 Recess Dimensions for Binding Head Screws (Machine Screws Only) [ASME/ANSI]
ASME/ANSI B 18.6.3 (T28) - 2013 		Recess Dimensions for Binding Head Screws (Machine Screws Only)
14 Countersunk head screws—Head configuration and guaging [ISO]
ISO 7721 - 1983 		Countersunk head screws—Head configuration and guaging
15 Metic threads and points for tapping screws [ASME]
ASME B 18.6.5M - 2000 (R2010) 		Metic threads and points for tapping screws
16 Recess Dimensions for 100-deg Flat Countersunk Head Screws (Machine Screws Only) [ASME/ANSI]
ASME/ANSI B 18.6.3 (T4) - 2013 		Recess Dimensions for 100-deg Flat Countersunk Head Screws (Machine Screws Only)
17 Recess Dimensions for Fillister Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T22) - 2013 		Recess Dimensions for Fillister Head Screws
18 Thread Lengths for Type A, AB, B, BF, BP and BT Tapping Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T46) - 2013 		Thread Lengths for Type A, AB, B, BF, BP and BT Tapping Screws
19 Recess Dimensions for Round Washer Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T39) - 2013 		Recess Dimensions for Round Washer Head Screws
20 Recess Dimensions for Combination Slotted Round Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T37) - 2013 		Recess Dimensions for Combination Slotted Round Head Screws
21 60° centre holes - Types R. A. B. and C [DIN]
DIN 332 (-1) - 1986 		60° centre holes - Types R. A. B. and C
22 Fasteners—Surface discontinuities— Part2:Nuts [ISO]
ISO 6157-2 - 1995 		Fasteners—Surface discontinuities— Part2:Nuts
23 Recess Dimensions for Pan Head Screws (Types IA, III, and VI) [ASME/ANSI]
ASME/ANSI B 18.6.3 (T19) - 2013 		Recess Dimensions for Pan Head Screws (Types IA, III, and VI)
24 Dimensions of Hexagon Sockets [ASME]
ASME B 18.3 (Table 18) - 2012 		Dimensions of Hexagon Sockets
25 Recess Dimensions for Combination Slotted Type I Indented Hex Washer Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T34) - 2013 		Recess Dimensions for Combination Slotted Type I Indented Hex Washer Head Screws
26 Cross recessed-H type [ISO]
ISO 4757 - 1983 		Cross recessed-H type
27 Hot rolled flat steel bars and steel wide flats for general purposes - Dimensions and tolerances on shape and dimensions [EN]
EN 10058 - 2018 		Hot rolled flat steel bars and steel wide flats for general purposes - Dimensions and tolerances on shape and dimensions
28 Thread run-outs and thread undercuts [DIN]
DIN 76-1 - 2016 		Thread run-outs and thread undercuts
29 Recess Dimensions for Truss Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T25) - 2013 		Recess Dimensions for Truss Head Screws
30 Hexalobular internal driving feature for bolts and screws [ISO]
ISO 10664 - 2005 		Hexalobular internal driving feature for bolts and screws
31 Recess Dimensions for Round Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T36) - 2013 		Recess Dimensions for Round Head Screws
32 Self-tapping screws for metric ISO threads - Part 2: Guide values for hole diameters [DIN]
DIN 7500 (-2) - 2016 		Self-tapping screws for metric ISO threads - Part 2: Guide values for hole diameters
33 Dimensions of Combination Slotted Truss Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T26) - 2013 		Dimensions of Combination Slotted Truss Head Screws
34 Dimensioning and indication of knurling [ISO]
ISO 13444 - 2012 		Dimensioning and indication of knurling
35 Fasteners—Surface discontinuities— Part3:Bolts,screw and studs for special requirements [ISO]
ISO 6157-3 - 1988 		Fasteners—Surface discontinuities— Part3:Bolts,screw and studs for special requirements
36 Recess Dimensions for Flat 82° Countersunk Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T2) - 2013 		Recess Dimensions for Flat 82° Countersunk Head Screws
37 Dimensions of Type TRS Tapping Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T45) - 2013 		Dimensions of Type TRS Tapping Screws
38 Thread rolling screws for ISO metric thread guidelinge values for hole diameters [DIN]
DIN 7500-2 - 1984 		Thread rolling screws for ISO metric thread guidelinge values for hole diameters
39 Type BF and BT, Thread Cutting Tapping Screws [Table 7] [ASME]
ASME B 18.6.4 (BF/BT) - 1998 		Type BF and BT, Thread Cutting Tapping Screws [Table 7]
40 Body and grip lengths for socket head cap screws [ASME]
ASME B 18.3 (Table 4) - 2012 		Body and grip lengths for socket head cap screws
41 Hexalobular internal driving feature for bolts and screws [ISO]
ISO 10664 - 2014 		Hexalobular internal driving feature for bolts and screws
42 Recess Dimensions for Indented Regular and Large Hex Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T30) - 2013 		Recess Dimensions for Indented Regular and Large Hex Head Screws
43 Recess Dimensions for Close Tolerance 100-deg Flat Countersunk Head Screws (Machine Screws Only) [ASME/ANSI]
ASME/ANSI B 18.6.3 (T6) - 2013 		Recess Dimensions for Close Tolerance 100-deg Flat Countersunk Head Screws (Machine Screws Only)
44 Thread Lengths for Type C, D, F, G, T and TRS Tapping Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T47) - 2013 		Thread Lengths for Type C, D, F, G, T and TRS Tapping Screws
45 Internal drive, offset cruciform recess (Torq-Set) for rotary fastening devices. Metric series [ISO]
ISO 7994 - 1985 		Internal drive, offset cruciform recess (Torq-Set) for rotary fastening devices. Metric series
46 12 point socket for bolts and screws [DIN]
DIN 34824 - 2007 		12 point socket for bolts and screws
47 Tapping screw connections - Guideline values for core hole diameters and use [DIN]
DIN 7975 - 2016 		Tapping screw connections - Guideline values for core hole diameters and use
48 Recess Dimensions for Undercut Oval 82-deg Countersunk Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T12) - 2013 		Recess Dimensions for Undercut Oval 82-deg Countersunk Head Screws
49 Recess Dimensions for Oval 82° Countersunk Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T8) - 2013 		Recess Dimensions for Oval 82° Countersunk Head Screws
50 Fasteners—Surface discontinuities— Part1:Bolts,screws and studs for general requirements [ISO]
ISO 6157-1 - 1988 		Fasteners—Surface discontinuities— Part1:Bolts,screws and studs for general requirements
51 Fasteners - Clearanc holes for bolts and screws [DIN EN]
DIN EN 20273 - 1992 		Fasteners - Clearanc holes for bolts and screws
52 Recess Dimensions for Indented Hex Washer Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T33) - 2013 		Recess Dimensions for Indented Hex Washer Head Screws
53 Cross recessed-Z type [ISO]
ISO 4757 - 1983 		Cross recessed-Z type
54 Recess Dimensions for Oval 82-deg Coutersunk Trim Head Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T16) - 2013 		Recess Dimensions for Oval 82-deg Coutersunk Trim Head Screws
55 Standard Test-Plate Thickness and Hole Sizes for Drive-Test Inspection of Tapping Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T48) - 2013 		Standard Test-Plate Thickness and Hole Sizes for Drive-Test Inspection of Tapping Screws
56 Fasteners─Clearance holes for bolts and screws [ISO]
ISO 273 - 1979 		Fasteners─Clearance holes for bolts and screws
57 Flared couplings - Flared end [GB]
GB /T 5652 - 2008 		Flared couplings - Flared end
58 Woodruff keyways [GB]
GB /T 1098 - 2003 		Woodruff keyways
59 length of semi-tubular rivets [JIS]
JIS B 1215 (T6) - 1976 		length of semi-tubular rivets
60 Hot-rolled channel steel [GB]
GB 707 - 1988 		Hot-rolled channel steel
61 General purpose bolts and screws - Radius under the head [GB]
GB /T 3105 - 2002 		General purpose bolts and screws - Radius under the head
62 Fasteners - Clearanc holes for bolts and screws [GB]
GB 5277 - 1985 		Fasteners - Clearanc holes for bolts and screws
63 Rivet shank diameters (except blind rivets)【ISO 1051:1999】 [GB]
GB 18194 - 2000 		Rivet shank diameters (except blind rivets)【ISO 1051:1999】
64 Stress area and bearing area for threaded fasteners [GB]
GB /T 16823.1 - 1997 		Stress area and bearing area for threaded fasteners
65 Fasteners - Split pin holes and wire holes （ISO 7378:1983） [GB]
GB 5278 - 1985 		Fasteners - Split pin holes and wire holes （ISO 7378:1983）
66 Countersunk head screws - Head configuration and gauging [GB]
GB /T 5279 - 1985 		Countersunk head screws - Head configuration and gauging
67 Hexalobular internal driving feature for bolts and screws [GB]
GB /T 6188 - 2017 		Hexalobular internal driving feature for bolts and screws
68 Connections with waisted stud - Tape classification [GB]
GB /T 13807.1 - 2008 		Connections with waisted stud - Tape classification
69 Drill diameter for use prior to tapping screw threads [GB]
GB /T 20330 - 2006 		Drill diameter for use prior to tapping screw threads
70 Cross recesses for screws [GB]
GB 944.1 - 1985 		Cross recesses for screws
71 Fasteners-Ends of parts with external thread（ISO 4753:2011, MOD） [GB]
GB /T 2 - 2016 		Fasteners-Ends of parts with external thread（ISO 4753:2011, MOD）
72 Square and rectangular keyways [GB]
GB /T 1095 - 2003 		Square and rectangular keyways
73 Clearance holes for rivets [GB]
GB 152.1 - 1988 		Clearance holes for rivets
74 Fastners - Widths across flats of hexagon products [GB]
GB 3104 - 1982 		Fastners - Widths across flats of hexagon products
75 Knurl [GB]
GB /T 6403.3 - 2008 		Knurl
76 Hexalobular internal driving feature for bolts and screws [GB]
GB /T 6188 - 2008 		Hexalobular internal driving feature for bolts and screws
77 Hexagon lobuar for fasteners - Type E [GB]
GB 6189 - 1986 		Hexagon lobuar for fasteners - Type E
78 Center holes [GB]
GB /T 145 - 2001 		Center holes
79 Hexalobular internal driving feature for bolts and screws [JIS]
JIS B 1015 - 2018 		Hexalobular internal driving feature for bolts and screws
80 Taper keys of keyways [GB]
GB /T 1563 - 2017 		Taper keys of keyways
81 Offset cruciform recess fro rotary fastening devices [GB]
GB /T 12520 - 1990 		Offset cruciform recess fro rotary fastening devices
82 Countersunk flat head screws - Part2: Penetration depth of cross recesses [GB]
GB /T 5279.2 - 1997 		Countersunk flat head screws - Part2: Penetration depth of cross recesses
83 Fasteners - Bolts, screws and studs - Nominal lengths and thread lengths (ISO 888:2012, MOD) [GB]
GB /T 3106 - 2016 		Fasteners - Bolts, screws and studs - Nominal lengths and thread lengths (ISO 888:2012, MOD)
84 Countersinks for countersunk head screws [GB]
GB /T 152.2 - 2014 		Countersinks for countersunk head screws