About Us Pricing Terms of Use FAQ Contact Us
| 简体 | 繁體 |
English Deutsch Français 日本語 Italiano Español 한어 Português Русский بالعربية Türkçe

Click Specification

Unit:inch

Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws

ASME/ANSI B 18.6.3 (T44) - 2013

Display drawing:

美标ASME/ANSI B18.6.3 (T44) - 2013 ASME/AN Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws
Screw Thread
d
2# 2# 3# 3# 4# 4# 5# 5# 6# 6# 8# 8# 10#
PP Threads per in.
D Nominal Diameter
max
min
P Point Diameter /Ref.
S ③ For Short Screws /max
For Short Screws /min
For Long Screws /max
For Long Screws /min
L ③ Determinant Lengths /90-deg Heads
Determinant Lengths /Csk. Heads
Minimum Practical Nominal screw Length /90-deg Heads
Minimum Practical Nominal screw Length /Csk. Heads
56 64 48 56 40 48 40 44 32 40 32 36 24
0.0860 0.0860 0.0990 0.0990 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900
0.0860 0.0860 0.0990 0.0990 0.1120 0.1120 0.1250 0.1250 0.1380 0.1380 0.1640 0.1640 0.1900
0.0813 0.0816 0.0938 0.0942 0.1061 0.1068 0.1191 0.1195 0.1312 0.1321 0.1571 0.1577 0.1818
0.068 0.070 0.078 0.081 0.087 0.091 0.100 0.102 0.107 0.113 0.132 0.136 0.148
0.062 0.055 0.073 0.062 0.088 0.073 0.088 0.080 0.109 0.088 0.109 0.097 0.146
0.045 0.039 0.052 0.045 0.062 0.052 0.062 0.057 0.078 0.062 0.078 0.069 0.104
0.080 0.070 0.094 0.080 0.112 0.094 0.112 0.102 0.141 0.112 0.141 0.125 0.188
0.062 0.055 0.073 0.062 0.088 0.073 0.088 0.080 0.109 0.088 0.109 0.097 0.146
5/32 1/8 3/16 5/32 7/32 3/16 7/32 3/16 1/4 7/32 1/4 7/32 11/32
3/16 3/16 7/32 3/16 1/4 7/32 9/32 1/4 5/16 9/32 11/32 5/16 7/16
5/32 1/8 5/32 5/32 3/16 5/32 3/16 3/16 1/4 3/16 1/4 7/32 5/16
3/16 5/32 7/32 3/16 1/4 7/32 1/4 1/4 5/16 1/4 5/16 9/32 13/32
Screw Thread
d
10# 12# 12# 1/4 1/4 5/16 5/16 3/8 3/8 7/16 7/16 1/2 1/2
PP Threads per in.
D Nominal Diameter
max
min
P Point Diameter /Ref.
S ③ For Short Screws /max
For Short Screws /min
For Long Screws /max
For Long Screws /min
L ③ Determinant Lengths /90-deg Heads
Determinant Lengths /Csk. Heads
Minimum Practical Nominal screw Length /90-deg Heads
Minimum Practical Nominal screw Length /Csk. Heads
32 24 28 20 28 18 24 16 24 14 20 13 20
0.1900 0.2160 0.2160 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000
0.1900 0.2160 0.2160 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000
0.1831 0.2078 0.2085 0.2408 0.2425 0.3026 0.3042 0.3643 0.3667 0.4258 0.4281 0.4876 0.4906
0.158 0.174 0.180 0.200 0.214 0.257 0.271 0.312 0.333 0.366 0.387 0.423 0.450
0.109 0.146 0.125 0.175 0.125 0.194 0.146 0.219 0.146 0.250 0.175 0.269 0.175
0.078 0.104 0.089 0.125 0.089 0.139 0.104 0.156 0.104 0.179 0.125 0.192 0.125
0.141 0.188 0.161 0.225 0.161 0.250 0.188 0.281 0.188 0.321 0.225 0.346 0.225
0.109 0.146 0.125 0.175 0.125 0.194 0.146 0.219 0.146 0.250 0.175 0.269 0.175
1/4 11/32 5/16 13/32 5/16 15/32 11/32 1/2 11/32 19/32 13/32 5/8 13/32
11/32 7/16 13/32 17/32 13/32 19/32 15/32 11/16 1/2 3/4 9/16 25/32 9/16
1/4 5/16 9/32 3/8 9/32 7/16 5/16 15/32 5/16 9/16 3/8 19/32 3/8
5/16 13/32 3/8 1/2 3/8 9/16 15/32 5/8 1/2 23/32 17/32 3/4 17/32
①,Points of screws shall be tapered and fluted or slotted as illustrated above for the respective types. The flute on Type T screws shall have an included angle of 90 deg to 95 deg and the thread cutting edge located above the axis of screw. Tapered threads shall have unfinished crests, and the flutes or slots shall extend through the first full thread beyond taper except for Type F screws on which tapered threads may be complete at manufacture's option and flutes may be one pitch short of the first full form thread. Other details of taper and flute design shall be potional with the manufacturer, provided the screws meet the specified performance requirements.
③,Screws of these nominal lengths and shorter shall have point taper lengths specified for short screws. Longer lengths shall have point taper lengths specified for long screws.

Alternative history

ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3 - 2010 ASME/ANSI B 18.6.3T44 - 2013 ASME B 18.6.3T4.1.2.2-1 - 2024
Send Inquiry

Similar Standards

1 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
2 Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws [ASME]
ASME B 18.6.3 (T4.1.2.2-1) - 2024 		Dimensions of Threads and Points for Type D, F, G, and T Thread-Cutting Tapping Screws
3 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
4 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
5 Fasteners—Ends of parts with external ISO metric thread [ISO]
ISO 4753 - 2011 		Fasteners—Ends of parts with external ISO metric thread
6 Copper tubes of circular section - Dimensions [ISO]
ISO 274 - 1975 		Copper tubes of circular section - Dimensions
7 Connections for general use and fluid power - Ports and stud ends with ISO 725 threads and O-ring sealing - Part 3: Light-duty (L series) stud ends [ISO]
ISO 11926-3 - 1995 		Connections for general use and fluid power - Ports and stud ends with ISO 725 threads and O-ring sealing - Part 3: Light-duty (L series) stud ends
8 Fasteners—Hexagon products—Widths across flats [ISO]
ISO 272 - 1982 		Fasteners—Hexagon products—Widths across flats
9 Fasteners—Thread undercuts for external metric ISO [ISO]
ISO 4755 - 1983 		Fasteners—Thread undercuts for external metric ISO
10 Fasteners - Clearanc holes for bolts and screws [DIN EN]
DIN EN 20273 - 1992 		Fasteners - Clearanc holes for bolts and screws
11 Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 2: Stud ends with elastomeric sealing (type E) [ISO]
ISO 9974-2 - 1996 		Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 2: Stud ends with elastomeric sealing (type E)
12 Aerospace series - Installation holes for inserts, screw thread, helical coil, self-locking - Design standard [EN]
EN 3044 - 1998 		Aerospace series - Installation holes for inserts, screw thread, helical coil, self-locking - Design standard
13 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
14 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
15 Fasteners─Clearance holes for bolts and screws [ISO]
ISO 273 - 1979 		Fasteners─Clearance holes for bolts and screws
16 Cross recessed-H type [ISO]
ISO 4757 - 1983 		Cross recessed-H type
17 Connections for general use and fluid power - Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing - Part 4: Stud ends for general use only with metal-to-metal sealing (type B) [ISO]
ISO 1179-4 - 2007 		Connections for general use and fluid power - Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing - Part 4: Stud ends for general use only with metal-to-metal sealing (type B)
18 Connections for general use and fluid power - Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing - Part 1: Threaded ports [ISO]
ISO 1179-1 - 2013 		Connections for general use and fluid power - Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing - Part 1: Threaded ports
19 Hexalobular internal driving feature for bolts and screws [ISO]
ISO 10664 - 2005 		Hexalobular internal driving feature for bolts and screws
20 Fasteners—Surface discontinuities— Part2:Nuts [ISO]
ISO 6157-2 - 1995 		Fasteners—Surface discontinuities— Part2:Nuts
21 Standard Test-Plate Thickness and Hole Sizes for Drive-Test Inspection of Tapping Screws [ASME]
ASME B 18.6.3 (T4.11.1-1) - 2024 		Standard Test-Plate Thickness and Hole Sizes for Drive-Test Inspection of Tapping Screws
22 Countersunk flat hed screws—Part 2:Penetration depth of cross recesses [ISO]
ISO 7721-2 - 1990 		Countersunk flat hed screws—Part 2:Penetration depth of cross recesses
23 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
24 Connections for hydraulic fluid power and general use - Ports and stud ends with ISO 261 metric threads and O-ring sealing - Part 1: Ports with truncated housing for O-ring [ISO]
ISO 6149-1 - 2022 		Connections for hydraulic fluid power and general use - Ports and stud ends with ISO 261 metric threads and O-ring sealing - Part 1: Ports with truncated housing for O-ring
25 Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T43) - 2013 		Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws
26 Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws [ASME]
ASME B 18.6.3 (T4.1.2.1-1) - 2024 		Dimensions of Threads and Points for Types BF and BT Thread-Cutting Tapping Screws
27 Dimensions of Type TRS Tapping Screws [ASME/ANSI]
ASME/ANSI B 18.6.3 (T45) - 2013 		Dimensions of Type TRS Tapping Screws
28 Dimensioning and indication of knurling [ISO]
ISO 13444 - 2012 		Dimensioning and indication of knurling
29 60° centre holes - Types R. A. B. and C [DIN]
DIN 332 (-1) - 1986 		60° centre holes - Types R. A. B. and C
30 12 point socket for bolts and screws [DIN]
DIN 34824 - 2007 		12 point socket for bolts and screws
31 Cold Rolled Uncoated and Zinc or Zinc-Nickel Electrolytically Coated Low Carbon and High Yield Strength Steel Flat Products for Cold Forming - Tolerances on Dimensions and Shape [EN]
EN 10131 - 2006 		Cold Rolled Uncoated and Zinc or Zinc-Nickel Electrolytically Coated Low Carbon and High Yield Strength Steel Flat Products for Cold Forming - Tolerances on Dimensions and Shape
32 Type D,F,G and Type T Thread Cutting Tapping Screws [Table 8] [ASME]
ASME B 18.6.4 (D/F/G/T) - 1998 (R2005) 		Type D,F,G and Type T Thread Cutting Tapping Screws [Table 8]
33 Rivet shank diameters [ISO]
ISO 1051 - 1999 		Rivet shank diameters
34 Metic threads and points for tapping screws [ASME]
ASME B 18.6.5M - 2000 (R2010) 		Metic threads and points for tapping screws
35 Knurle [DIN]
DIN 82 - 1973 		Knurle
36 General purpose bolts and screws─Metric series─Radii under the head [ISO]
ISO 885 - 2000 		General purpose bolts and screws─Metric series─Radii under the head
37 Dimensions of Hexagon Sockets [Table 18] [ASME]
ASME B 18.3 (Table 18) - 2012 		Dimensions of Hexagon Sockets [Table 18]
38 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
39 Countersunk head screws—Head configuration and guaging [ISO]
ISO 7721 - 1983 		Countersunk head screws—Head configuration and guaging
40 Geometrical product specifications (GPS) - Indication of surface texture in technical product documentation [ISO]
ISO 1302 - 2002 		Geometrical product specifications (GPS) - Indication of surface texture in technical product documentation
41 Cross recessed-Z type [ISO]
ISO 4757 - 1983 		Cross recessed-Z type
42 Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 1: Threaded ports [ISO]
ISO 9974-1 - 1996 		Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 1: Threaded ports
43 Hexalobular internal driving feature for bolts and screws [ISO]
ISO 10664 - 2014 		Hexalobular internal driving feature for bolts and screws
44 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
45 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
46 Thread run-out for fasteners with thread in accordance with ISO 261 and ISO 262 [ISO]
ISO 3508 - 1976 		Thread run-out for fasteners with thread in accordance with ISO 261 and ISO 262
47 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
48 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
49 Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 3: Stud ends with metal-to-metal sealing (type B) [ISO]
ISO 9974-3 - 1996 		Connections for general use and fluid power - Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing - Part 3: Stud ends with metal-to-metal sealing (type B)
50 Type BF and BT, Thread Cutting Tapping Screws [Table 7] [ASME]
ASME B 18.6.4 (BF/BT) - 1998 (R2005) 		Type BF and BT, Thread Cutting Tapping Screws [Table 7]
51 Body and grip lengths for socket head cap screws [Table 4] [ASME]
ASME B 18.3 (Table 4) - 2012 		Body and grip lengths for socket head cap screws [Table 4]
52 Countersunk head screws - Head configuration and gauging [EN]
EN 27721 - 1991 		Countersunk head screws - Head configuration and gauging
53 Thread run-outs and thread undercuts [DIN]
DIN 76-1 - 2016 		Thread run-outs and thread undercuts
54 Type TRS Tapping Screws [ASME]
ASME B 18.6.3 (T4.1.3-1) - 2024 		Type TRS Tapping Screws
55 Aerospace - Spline drives - Wrenching configuration - Metric series [ISO]
ISO 7403 - 1998 		Aerospace - Spline drives - Wrenching configuration - Metric series
56 Stress area and bearing area for threaded fasteners [GB]
GB /T 16823.1 - 1997 		Stress area and bearing area for threaded fasteners
57 Straight cylindrical involute splines -- side fit -- Generalities, dimensions and inspection [JIS]
JIS B 1603 - 1995 		Straight cylindrical involute splines -- side fit -- Generalities, dimensions and inspection
58 Connections with waisted stud - Tape classification [GB]
GB /T 13807.1 - 2008 		Connections with waisted stud - Tape classification
59 Stress area and bearing area for threaded fasteners [JIS]
JIS B 1082 - 2009 		Stress area and bearing area for threaded fasteners
60 Fasteners - Split pin holes and wire holes （ISO 7378:1983） [GB]
GB 5278 - 1985 		Fasteners - Split pin holes and wire holes （ISO 7378:1983）
61 Center holes [GB]
GB /T 145 - 2001 		Center holes
62 Knurling [JIS]
JIS B 0951 - 1962 		Knurling
63 Hexagon lobuar for fasteners - Type E [GB]
GB 6189 - 1986 		Hexagon lobuar for fasteners - Type E
64 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）
65 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)
66 Woodruff keyways [GB]
GB /T 1098 - 2003 		Woodruff keyways
67 Hot-rolled channel steel [GB]
GB 707 - 1988 		Hot-rolled channel steel
68 Countersinks for countersunk head screws [GB]
GB /T 152.2 - 2014 		Countersinks for countersunk head screws
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 Tapping rivats - Thread and end [UNI]
UNI 7345 - 1974 		Tapping rivats - Thread and end
72 General purpose bolts and screws - Metric series -- Radii under the head [JIS]
JIS B 1005 - 2003 		General purpose bolts and screws - Metric series -- Radii under the head
73 Square and rectangular keyways [GB]
GB /T 1095 - 2003 		Square and rectangular keyways
74 Taper keys of keyways [GB]
GB /T 1563 - 2017 		Taper keys of keyways
75 Rivet Shank Diameters (Except Blind Rivets) [ISO 1051:1999] [GB]
GB 18194 - 2000 		Rivet Shank Diameters (Except Blind Rivets) [ISO 1051:1999]
76 Flared couplings - Flared end [GB]
GB /T 5652 - 2008 		Flared couplings - Flared end
77 Offset cruciform recess fro rotary fastening devices [GB]
GB /T 12520 - 1990 		Offset cruciform recess fro rotary fastening devices
78 Hexalobular internal driving feature for bolts and screws [GB]
GB /T 6188 - 2008 		Hexalobular internal driving feature for bolts and screws
79 Knurl [GB]
GB /T 6403.3 - 2008 		Knurl
80 Hexalobular internal driving feature for bolts and screws [GB]
GB /T 6188 - 2017 		Hexalobular internal driving feature for bolts and screws
81 Fasteners - Clearanc holes for bolts and screws [GB]
GB 5277 - 1985 		Fasteners - Clearanc holes for bolts and screws
82 Clearance holes for rivets [GB]
GB 152.1 - 1988 		Clearance holes for rivets
83 Countersunk head screws - Head configuration and gauging [GB]
GB /T 5279 - 1985 		Countersunk head screws - Head configuration and gauging
84 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
85 Fastners - Widths across flats of hexagon products [GB]
GB 3104 - 1982 		Fastners - Widths across flats of hexagon products
86 Hexalobular internal driving feature for bolts and screws [JIS]
JIS B 1015 - 2018 		Hexalobular internal driving feature for bolts and screws
87 General purpose bolts and screws - Radius under the head [GB]
GB /T 3105 - 2002 		General purpose bolts and screws - Radius under the head
88 Cross Recesses For Screws [IS]
IS 7478 - 2011 		Cross Recesses For Screws