SCREW THREADS.NUTS.BOLT HEADS.
Diam.
of
Screw.
The Sellers Standard System Of Screw Threads Nuts 443 screw		Threads
per
inch.
The Sellers Standard System Of Screw Threads Nuts 443 thread		Diameter
at root
of Thread.
The Sellers Standard System Of Screw Threads Nuts 443 root		Area
of
Bolt
at
root
of
Thread.		Width
of
Flat.
The Sellers Standard System Of Screw Threads Nuts 443 flat		Short
Diam.
Rough
The Sellers Standard System Of Screw Threads Nuts 443 hex1		Short
Diam.
Finish.
The Sellers Standard System Of Screw Threads Nuts 443 hex2		Long
Diam.
Rough.
The Sellers Standard System Of Screw Threads Nuts 443 hex3		Long
Diam.
Rough.
The Sellers Standard System Of Screw Threads Nuts 443 dia		Thick
ness
Rough.
The Sellers Standard System Of Screw Threads Nuts 443 bolt1		Thick
ness
Finish
The Sellers Standard System Of Screw Threads Nuts 443 bolt2
1
4		20 .185 13
64		.026.0062 1
2		 7
16		 37
64		 7
10		 1
4		 3
16		 1
2		 7
16		 37
64		 7
10		 1
4		 3
16
5
16		18 .240 15
64		.045.0074 19
32		 17
32		 11
16		 10
12		 5
16		 1
4		 19
32		 17
32		 11
16		 10
12		 19
64		 1
4
3
8		16 .294 19
64		.067.0078 11
16		 5
8		 51
64		 63
64		 3
8		 5
16		 11
16		 5
8		 51
64		 63
64		 11
32		 5
16
7
16		14 .344 11
32		.092.0089 25
32		 23
33		 9
10		17
64		 7
16		 3
8		 25
32		 23
32		 9
16		17
64		 25
64		 3
8
1
2		13 .400 13
32		.125.0096 7
8		 13
16		1 115
64		 1
2		 7
16		 7
8		 13
16		1 115
64		 7
16		 7
16
9
16		12 .454 29
64		.161.0104 31
32		 29
32		11
8		123
64		 9
16		 1
2		 31
32		 29
32		11
8		123
64		 31
64		 1
2
5
8		11 .507 33
64		.201.011311
16		1 17
32		11
2		 5
8		 9
16		11
16		1 17
32		11
2		 17
32		 9
16
3
4		10 .620 5
8		.301.012511
4		13
16		17
16		149
64		 3
4		 11
16		11
4		13
16		17
16		149
64		 5
8		 11
16
7
8		9 .731 47
64		.419.013817
16		13
8		121
32		21
32		 7
8		 13
16		17
16		13
8		121
32		21
32		 23
32		 13
16
1 8 .837 27
32		.550.015615
8		19
16		17
8		219
64		1 15
16		15
8		19
16		17
8		219
64		 13
16		 15
16
11
8		7 .940 15
16		.693.0178113
16		13
4		25
32		29
16		11
8		11
16		113
16		13
4		25
32		27
16		 29
32		11
16
11
4		7 1.06511
16		.890.01782 115
16		25
16		253
64		11
4		13
16		2 115
16		25
16		253
64		1 13
16
13
8		6 1.16015
32		1.056.020823
16		21
8		217
32		33
32		13
8		15
16		23
16		21
8		217
32		33
32		13
32		15
16
11
2		6 1.28419
32		1.294.020823
8		25
16		23
4		323
64		11
2		17
16		23
8		25
16		23
4		323
64		13
16		17
16
15
8		51
2		1.389125
64		1.515.022729
16		21
2		231
32		35
8		15
8		19
16		29
16		21
2		231
32		35
8		19
32		19
16
13
4		5 1.491131
64		1.746.025023
4		211
16		33
16		357
64		13
4		111
16		23
4		211
16		33
16		357
64		13
8		111
16
17
8		5 1.616139
64		2.051.0250215
16		27
8		313
32		45
32		17
8		113
16		215
16		27
8		313
32		45
32		115
32		113
16
2 41
2		1.742123
32		2.301.027731
8		31
16		35
8		427
64		2 115
16		31
8		31
16		35
8		427
64		19
16		115
16
21
4		41
2		1.962131
32		3.023.027731
2		37
16		41
16		461
64		21
4		23
16		31
2		37
16		41
16		461
64		13
4		23
16
21
2		4 2.176211
64		3.718.031237
8		313
16		41
2		531
64		21
2		27
16		37
8		313
16		41
2		531
64		115
16		27
16
23
4		4 2.426227
64		4.622.031241
4		43
16		429
32		6 23
4		211
16		41
4		43
16		429
32		6 21
8		211
16
3 31
2		2.62925
8		5.428.035745
8		49
16		53
8		617
32		3 215
16		45
8		49
16		53
8		617
32		25
16		215
16
31
4		31
2		2.87927
8		6.509.03575 415
16		513
16		71
16		31
4		33
16		5 415
16		513
16		71
16		21
2		33
16
31
2		31
4		3.10033
32		7.547.038453
8		55
16		67
32		739
64		31
2		37
16		53
8		55
16		67
32		739
64		211
16		37
16
33
4		3 3.31735
16		8.614.041353
4		511
16		621
32		81
8		33
4		311
16		53
4		511
16		621
32		81
8		27
8		311
16
4 3 3.56739
16		9.993.041361
8		61
16		73
32		841
64		4 315
16		61
8		61
16		73
32		841
64		31
16		315
16
41
4		27
8		3.798351
64		11.329.043561
2		67
16		79
16		93
16		41
4		43
16		61
2		67
16		79
16		93
16		31
4		43
16
41
2		23
4		4.02841
32		12.742.045467
8		613
16		731
32		93
4		41
2		47
16		67
8		613
16		731
32		93
4		37
16		47
16
43
4		25
8		4.25641
4		14.226.047671
4		73
16		813
32		101
4		43
4		411
16		71
4		73
16		813
32		101
4		35
8		411
16
5 21
2		4.480431
64		15.763.050075
8		79
16		827
32		1049
64		5 415
16		75
8		79
16		827
32		1049
64		313
16		415
16
51
4		21
2		4.730447
64		17.570.05008 715
16		99
32		1123
64		51
4		53
16		8 715
16		99
32		1123
64		4 53
16
51
2		23
8		4.953461
64		19.267.052683
8		85
16		923
32		117
8		51
2		57
16		83
8		85
16		923
32		117
8		43
16		57
16
53
4		23
8		5.203513
64		21.261.052683
4		811
16		105
32		12 53
4		511
16		83
4		811
16		105
32		123
8		43
8		511
16
6 21
4		5.423527
64		23.097.055591
8		91
16		1019
32		1215
16		6 515
16		91
8		91
16		1019
32		1215
16		49
16		515
16

Original Table

Original table

The dimensions given for diameter at root of threads are also those for diameter of hole in nuts and diameter of lap drills. All bolts and studs 3/4 in. diameter and above, screwed into boilers, have 12 threads per inch, sharp thread, a taper of 1/16 in. per 1 inch; tap drill should be 9/64 in. less than normal diameter of bolts.

The table is based upon the following general formulae for certain dimensions:

Short diam. rough nut or head=11/2 diam. of bolt + 1/8.
Short diam. finished nut or head=11/2 diam. of bolt + 1/16.
Thickness rough nut=diameter of bolt.
Thickness finished nut=diameter of bolt - 1/16.
Thickness rough head=1/2 short diameter.
Thickness finished head=diameter of bolt - 1/16.