Threads

Metric threads

				
				
				Thread Diameter
				Pitch
				Core hole nut
				Outer-Bolt-Ø	
				Bolt-Flanks-Ø	
				Bolt-Core-Ø
						

				
				M
				mm
				mm
				max.
				min.
				max.
				min.
				max.
				

				3
				0,5
				2,5
				2,980
				2,874
				2,655
				2,580
				2,367
				

				3,5
				0,6
				2,9
				3,479
				3,354
				3,089
				3,004
				2,743
				

				4
				0,7
				3,3
				3,978
				3,838
				3,523
				3,433
				3,119
				

				4,5
				0,75
				3,7
				4,478
				4,338
				3,991
				3,901
				3,558
				

				5
				0,8
				4,2
				4,976
				4,826
				4,456
				4,361
				3,995
				

				6
				1
				5
				5,974
				5,794
				5,234
				5,212
				4,747
				

				7
				1
				6
				6,972
				6,794
				6,324
				6,212
				5,747
				

				8
				1,25
				6,8
				7,972
				7,760
				7,160
				7,042
				6,438
				

				9
				1,25
				7,8
				8,972
				8,760
				8,160
				8,042
				7,438
				

				10
				1,5
				8,5
				9,968
				9,732
				8,994
				8,862
				8,128
				

				11
				1,5
				9,5
				10,986
				10,732
				9,994
				9,862
				9,128
				

				12
				1,75
				10,2
				11,966
				11,701
				10,829
				10,679
				9,819
				

				14
				2
				12
				13,962
				12,682
				12,663
				12,503
				11,508
				

				16
				2
				14
				15,962
				15,682
				14,663
				14,503
				13,508
				

				18
				2,5
				15,5
				17,958
				17,623
				16,334
				16,164
				14,891
				

				20
				2,5
				17,5
				19,958
				19,623
				18,334
				18,164
				16,891
				

				22
				2,5
				19,5
				21,958
				21,623
				20,334
				20,164
				18,891
				

				24
				3
				21
				23,952
				23,577
				22,003
				21,803
				20,271
				

				27
				3
				24
				26,952
				26,577
				25,003
				24,803
				23,271
				

				30
				3,5
				26,5
				29,947
				29,522
				27,674
				27,462
				25,653
				

				33
				3,5
				29,5
				32,947
				32,522
				30,674
				30,462
				28,653
				

				36
				4
				32
				35,940
				35,465
				33,342
				33,118
				31,033
				

				39
				4
				35
				38,940
				38,465
				36,342
				36,118
				34,033
				

				42
				4,5
				37,5
				41,937
				41,437
				39,014
				38,778
				36,416
				

				45
				4,5
				40,5
				44,937
				44,437
				42,014
				41,778
				39,416
				

				48
				5
				43
				47,929
				47,399
				44,681
				44,431
				41,795
				

				52
				5
				47
				51,929
				51,399
				48,681
				48,431
				45,795
				

				56
				5,5
				50,5
				55,925
				55,365
				52,353
				52,088
				49,177
				

				60
				5,5
				54,5
				59,925
				59,365
				56,353
				56,088
				53,177
				

				64
				6
				58
				63,920
				63,320
				60,023
				59,743
				56,559
				

				68
				6
				62
				67,920
				67,320
				64,023
				64,743
				60,559
				

				
Sources:
DIN 13-1 - ISO metric threads for general use - Part 1: Nominal sizes for standard threads; nominal thread diameters from 1 mm to 68 mm
DIN 13-2 - ISO metric threads for general use - Part 2: Nominal dimensions for fine pitch threads with pitches of 0.2 mm, 0.25 mm and 0.35 mm; nominal thread diameters from 1 mm to 50 mm

				

				

Thread Diameter	Pitch	Core hole nut	Outer-Bolt-Ø	Bolt-Flanks-Ø	Bolt-Core-Ø
M	mm	mm	max.	min.	max.	min.	max.
3	0,5	2,5	2,980	2,874	2,655	2,580	2,367
3,5	0,6	2,9	3,479	3,354	3,089	3,004	2,743
4	0,7	3,3	3,978	3,838	3,523	3,433	3,119
4,5	0,75	3,7	4,478	4,338	3,991	3,901	3,558
5	0,8	4,2	4,976	4,826	4,456	4,361	3,995
6	1	5	5,974	5,794	5,234	5,212	4,747
7	1	6	6,972	6,794	6,324	6,212	5,747
8	1,25	6,8	7,972	7,760	7,160	7,042	6,438
9	1,25	7,8	8,972	8,760	8,160	8,042	7,438
10	1,5	8,5	9,968	9,732	8,994	8,862	8,128
11	1,5	9,5	10,986	10,732	9,994	9,862	9,128
12	1,75	10,2	11,966	11,701	10,829	10,679	9,819
14	2	12	13,962	12,682	12,663	12,503	11,508
16	2	14	15,962	15,682	14,663	14,503	13,508
18	2,5	15,5	17,958	17,623	16,334	16,164	14,891
20	2,5	17,5	19,958	19,623	18,334	18,164	16,891
22	2,5	19,5	21,958	21,623	20,334	20,164	18,891
24	3	21	23,952	23,577	22,003	21,803	20,271
27	3	24	26,952	26,577	25,003	24,803	23,271
30	3,5	26,5	29,947	29,522	27,674	27,462	25,653
33	3,5	29,5	32,947	32,522	30,674	30,462	28,653
36	4	32	35,940	35,465	33,342	33,118	31,033
39	4	35	38,940	38,465	36,342	36,118	34,033
42	4,5	37,5	41,937	41,437	39,014	38,778	36,416
45	4,5	40,5	44,937	44,437	42,014	41,778	39,416
48	5	43	47,929	47,399	44,681	44,431	41,795
52	5	47	51,929	51,399	48,681	48,431	45,795
56	5,5	50,5	55,925	55,365	52,353	52,088	49,177
60	5,5	54,5	59,925	59,365	56,353	56,088	53,177
64	6	58	63,920	63,320	60,023	59,743	56,559
68	6	62	67,920	67,320	64,023	64,743	60,559
Sources: DIN 13-1 - ISO metric threads for general use - Part 1: Nominal sizes for standard threads; nominal thread diameters from 1 mm to 68 mm DIN 13-2 - ISO metric threads for general use - Part 2: Nominal dimensions for fine pitch threads with pitches of 0.2 mm, 0.25 mm and 0.35 mm; nominal thread diameters from 1 mm to 50 mm

UNC-Threads

				
				
				Thread
				Diameter
				Outer Diameter
				Core Hole Diameter
				Threads
				Pitch
						

				
				UNC
				inch
				mm
				mm
				per inch
				mm
				

				N 1
				0,073
				1,854
				1,50
				64
				0,397
				

				N 2
				0,086
				2,184
				1,80
				56
				0,456
				

				N 3
				0,99
				2,515
				2,10
				48
				0,529
				

				N 4
				0,112
				2,845
				2,35
				40
				0,635
				

				N 5
				0,250
				3,175
				2,65
				40
				0,635
				

				N 6
				0,138
				3,505
				2,85
				32
				0,794
				

				N 8
				0,164
				4,166
				3,50
				32
				0,794
				

				N 10
				0,190
				4,826
				4,00
				24
				1,058
				

				N 12
				0,216
				5,486
				4,65
				24
				1,058
				

				1/4"
				0,250
				6,350
				5,35
				20
				1,270
				

				5/16"
				0,313
				7,938
				6,80
				18
				1,411
				

				3/8"
				0,375
				9,525
				8,25
				16
				1,587
				

				7/16"
				0,438
				11,112
				9,65
				14
				1,818
				

				1/2"
				0,500
				12,700
				11,15
				13
				1,954
				

				9/16"
				0,563
				14,288
				12,60
				12
				2,117
				

				5/8"
				0,625
				15,875
				14,05
				11
				2,309
				

				3/4"
				0,750
				19,050
				17,00
				10
				2,540
				

				7/8"
				0,875
				22,225
				20,00
				9
				2,822
				

				1"
				1,000
				25,400
				22,85
				8
				3,175
				

				1 1/8"
				1,125
				28,575
				25,65
				7
				3,628
				

				1 1/4"
				1,250
				31,750
				28,85
				7
				3,628
				

				1 3/8"
				1,375
				43,925
				31,55
				6
				4,233
				

				1 1/2"
				1,500
				38,100
				34,70
				6
				4,233
				

				1 3/4"
				1,750
				44,450
				40,40
				5
				5,080
				

				2"
				2,000
				50,800
				46,30
				4,5
				5,644
				

				2 1/4"
				2,250
				57,150
				52,65
				45
				5,644
				

				2 1/2"
				2,500
				63,500
				58,50
				4
				6,350
				

				2 3/4"
				2,750
				69,850
				64,75
				4
				6,350
				

				3"
				3,000
				76,200
				71,10
				4
				6,350
				

				3 1/4"
				3,250
				82,550
				77,45
				4
				6,350
				

				3 1/2"
				3,500
				88,900
				83,80
				4
				6,350
				

				3 3/4"
				3,750
				95,250
				90,15
				4
				6,350
				

				4"
				4,000
				101,60
				96,50
				4
				6,350
				

				Typically, thread dimensions >= 1" are offered by the manufacturers with an 8-UN thread.
				

				

Thread	Diameter	Outer Diameter	Core Hole Diameter	Threads	Pitch
UNC	inch	mm	mm	per inch	mm
N 1	0,073	1,854	1,50	64	0,397
N 2	0,086	2,184	1,80	56	0,456
N 3	0,99	2,515	2,10	48	0,529
N 4	0,112	2,845	2,35	40	0,635
N 5	0,250	3,175	2,65	40	0,635
N 6	0,138	3,505	2,85	32	0,794
N 8	0,164	4,166	3,50	32	0,794
N 10	0,190	4,826	4,00	24	1,058
N 12	0,216	5,486	4,65	24	1,058
1/4"	0,250	6,350	5,35	20	1,270
5/16"	0,313	7,938	6,80	18	1,411
3/8"	0,375	9,525	8,25	16	1,587
7/16"	0,438	11,112	9,65	14	1,818
1/2"	0,500	12,700	11,15	13	1,954
9/16"	0,563	14,288	12,60	12	2,117
5/8"	0,625	15,875	14,05	11	2,309
3/4"	0,750	19,050	17,00	10	2,540
7/8"	0,875	22,225	20,00	9	2,822
1"	1,000	25,400	22,85	8	3,175
1 1/8"	1,125	28,575	25,65	7	3,628
1 1/4"	1,250	31,750	28,85	7	3,628
1 3/8"	1,375	43,925	31,55	6	4,233
1 1/2"	1,500	38,100	34,70	6	4,233
1 3/4"	1,750	44,450	40,40	5	5,080
2"	2,000	50,800	46,30	4,5	5,644
2 1/4"	2,250	57,150	52,65	45	5,644
2 1/2"	2,500	63,500	58,50	4	6,350
2 3/4"	2,750	69,850	64,75	4	6,350
3"	3,000	76,200	71,10	4	6,350
3 1/4"	3,250	82,550	77,45	4	6,350
3 1/2"	3,500	88,900	83,80	4	6,350
3 3/4"	3,750	95,250	90,15	4	6,350
4"	4,000	101,60	96,50	4	6,350
Typically, thread dimensions >= 1" are offered by the manufacturers with an 8-UN thread.

UNF-Threads

				
				
				Thread
				Diameter
				Outer Diameter
				Core Hole Diameter
				Threads
				Pitch
						

				
				UNF
				inch
				mm
				mm
				per inch
				mm
				

				N 0
				0,060
				1,524
				1,25
				80
				0,317
				

				N 1
				0,073
				1,854
				1,55
				72
				0,353
				

				N 2
				0,068
				2,184
				1,90
				64
				0,397
				

				N 3
				0,099
				2,515
				2,15
				56
				0,453
				

				N 4
				0,112
				2,845
				2,40
				48
				0,529
				

				N 5
				0,125
				3,175
				2,70
				44
				0,577
				

				N 6
				0,138
				3,505
				2,95
				40
				0,635
				

				N 8
				0,164
				4,166
				3,50
				36
				0,705
				

				N 10
				0,190
				4,826
				4,10
				32
				0,794
				

				N 12
				0,216
				5,486
				4,70
				28
				0,907
				

				1/4"
				0,250
				6,350
				5,50
				28
				0,907
				

				5/16"
				0,313
				7,938
				6,90
				24
				1,058
				

				3/8"
				0,375
				9,525
				8,50
				24
				1,058
				

				7/16"
				0,438
				11,112
				9,90
				20
				1,270
				

				1/2"
				0,500
				12,700
				11,50
				20
				1,270
				

				9/16"
				0,563
				14,288
				12,90
				18
				1,411
				

				5/8"
				0,625
				15,875
				14,50
				18
				1,411
				

				3/4"
				0,750
				19,050
				17,50
				16
				1,587
				

				7/8"
				0,875
				22,250
				20,40
				14
				1,814
				

				1"
				1,000
				25,400
				23,25
				12
				2,117
				

				1 1/8"
				1,125
				28,575
				26,50
				12
				2,117
				

				1 1/4"
				1,250
				31,750
				29,50
				12
				2,117
				

				1 3/8"
				1,375
				38,100
				32,75
				12
				2,117
				

				1 1/2"
				1,500
				43,925
				36,00
				12
				2,117
				

				Typically, thread dimensions ≥ 1" with an 8-UN thread are offered by manufacturers.
				

				
Source:
ASME B1.1 - Unified Inch Screw Threads
				

				

Thread	Diameter	Outer Diameter	Core Hole Diameter	Threads	Pitch
UNF	inch	mm	mm	per inch	mm
N 0	0,060	1,524	1,25	80	0,317
N 1	0,073	1,854	1,55	72	0,353
N 2	0,068	2,184	1,90	64	0,397
N 3	0,099	2,515	2,15	56	0,453
N 4	0,112	2,845	2,40	48	0,529
N 5	0,125	3,175	2,70	44	0,577
N 6	0,138	3,505	2,95	40	0,635
N 8	0,164	4,166	3,50	36	0,705
N 10	0,190	4,826	4,10	32	0,794
N 12	0,216	5,486	4,70	28	0,907
1/4"	0,250	6,350	5,50	28	0,907
5/16"	0,313	7,938	6,90	24	1,058
3/8"	0,375	9,525	8,50	24	1,058
7/16"	0,438	11,112	9,90	20	1,270
1/2"	0,500	12,700	11,50	20	1,270
9/16"	0,563	14,288	12,90	18	1,411
5/8"	0,625	15,875	14,50	18	1,411
3/4"	0,750	19,050	17,50	16	1,587
7/8"	0,875	22,250	20,40	14	1,814
1"	1,000	25,400	23,25	12	2,117
1 1/8"	1,125	28,575	26,50	12	2,117
1 1/4"	1,250	31,750	29,50	12	2,117
1 3/8"	1,375	38,100	32,75	12	2,117
1 1/2"	1,500	43,925	36,00	12	2,117
Typically, thread dimensions ≥ 1" with an 8-UN thread are offered by manufacturers.
Source: ASME B1.1 - Unified Inch Screw Threads

8-UN-Threads

				
				
				Thread identification
				Diameter
				Outer Diameter
				Core Hole Diameter
				Threads
				Pitch
						

				
				inch
				mm
				mm
				per inch
				mm
				mm
				

				1 1/16" - 8UN
				1,0625
				26,987
				24,000
				8
				3,175
				

				1 1/8" - 8UN
				1,1250
				28,575
				25,500
				8
				3,175
				

				1 3/16" - 8UN
				1,1875
				30,162
				27,200
				8
				3,175
				

				1 1/4" - 8UN
				1,2500
				31,750
				28,800
				8
				3,175
				

				1 5/16" - 8UN
				1,3125
				33,337
				30,300
				8
				3,175
				

				1 3/8" - 8UN
				1,3750
				34,925
				31,900
				8
				3,175
				

				1 7/16" - 8UN
				1,4375
				36,512
				33,500
				8
				3,175
				

				1 1/2" - 8UN
				1,5000
				38,100
				35,100
				8
				3,175
				

				1 9/16"- 8UN
				1,5625
				39,688
				36,700
				8
				3,175
				

				1 5/8"- 8UN
				1,6250
				41,275
				38,300
				8
				3,175
				

				1 11/16"- 8UN
				1,6875
				42,862
				39,900
				8
				3,175
				

				1 3/4"- 8UN
				1,7500
				44,450
				41,400
				8
				3,175
				

				1 13/16"- 8UN
				1,8125
				46,037
				43,000
				8
				3,175
				

				1 7/8"- 8UN
				1,8750
				47,625
				44,600
				8
				3,175
				

				1 15/16"- 8UN
				1,9375
				49,212
				46,200
				8
				3,175
				

				2"- 8UN
				2,0000
				50,800
				47,800
				8
				3,175
				

				2 1/8"- 8UN
				2,1250
				53,975
				51,000
				8
				3,175
				

				2 1/4"- 8UN
				2,2500
				57,150
				54,100
				8
				3,175
				

				2 3/8"- 8UN
				2,3750
				60,325
				57,300
				8
				3,175
				

				2 1/2"- 8UN
				2,5000
				63,500
				60,500
				8
				3,175
				

				2 5/8"- 8UN
				2,6250
				66,675
				64,700
				8
				3,175
				

				2 3/4"- 8UN
				2,7500
				69,850
				66,800
				8
				3,175
				

				2 7/8"- 8UN
				2,8750
				73,025
				70,000
				8
				3,175
				

				3"- 8UN
				3,0000
				76,200
				73,200
				8
				3,175
				

				3 1/8"- 8UN
				3,1250
				79,375
				76,400
				8
				3,175
				

				3 1/4"- 8UN
				3,2500
				82,550
				79,500
				8
				3,175
				

				3 3/8"- 8UN
				3,3750
				85,725
				82,700
				8
				3,175
				

				3 1/2"- 8UN
				3,5000
				88,900
				85,900
				8
				3,175
				

				3 5/8"- 8UN
				3,6250
				92,075
				89,000
				8
				3,175
				

				3 3/4"- 8UN
				3,7500
				95,250
				92,300
				8
				3,175
				

				3 7/8"- 8UN
				3,8750
				98,425
				95,400
				8
				3,175
				

				4"- 8UN
				4,0000
				101,600
				98,600
				8
				3,175
				

				
Source:
ASME B1.1 - Unified Screw Threads
				

				

Thread identification	Diameter	Outer Diameter	Core Hole Diameter	Threads	Pitch
inch	mm	mm	per inch	mm	mm
1 1/16" - 8UN	1,0625	26,987	24,000	8	3,175
1 1/8" - 8UN	1,1250	28,575	25,500	8	3,175
1 3/16" - 8UN	1,1875	30,162	27,200	8	3,175
1 1/4" - 8UN	1,2500	31,750	28,800	8	3,175
1 5/16" - 8UN	1,3125	33,337	30,300	8	3,175
1 3/8" - 8UN	1,3750	34,925	31,900	8	3,175
1 7/16" - 8UN	1,4375	36,512	33,500	8	3,175
1 1/2" - 8UN	1,5000	38,100	35,100	8	3,175
1 9/16"- 8UN	1,5625	39,688	36,700	8	3,175
1 5/8"- 8UN	1,6250	41,275	38,300	8	3,175
1 11/16"- 8UN	1,6875	42,862	39,900	8	3,175
1 3/4"- 8UN	1,7500	44,450	41,400	8	3,175
1 13/16"- 8UN	1,8125	46,037	43,000	8	3,175
1 7/8"- 8UN	1,8750	47,625	44,600	8	3,175
1 15/16"- 8UN	1,9375	49,212	46,200	8	3,175
2"- 8UN	2,0000	50,800	47,800	8	3,175
2 1/8"- 8UN	2,1250	53,975	51,000	8	3,175
2 1/4"- 8UN	2,2500	57,150	54,100	8	3,175
2 3/8"- 8UN	2,3750	60,325	57,300	8	3,175
2 1/2"- 8UN	2,5000	63,500	60,500	8	3,175
2 5/8"- 8UN	2,6250	66,675	64,700	8	3,175
2 3/4"- 8UN	2,7500	69,850	66,800	8	3,175
2 7/8"- 8UN	2,8750	73,025	70,000	8	3,175
3"- 8UN	3,0000	76,200	73,200	8	3,175
3 1/8"- 8UN	3,1250	79,375	76,400	8	3,175
3 1/4"- 8UN	3,2500	82,550	79,500	8	3,175
3 3/8"- 8UN	3,3750	85,725	82,700	8	3,175
3 1/2"- 8UN	3,5000	88,900	85,900	8	3,175
3 5/8"- 8UN	3,6250	92,075	89,000	8	3,175
3 3/4"- 8UN	3,7500	95,250	92,300	8	3,175
3 7/8"- 8UN	3,8750	98,425	95,400	8	3,175
4"- 8UN	4,0000	101,600	98,600	8	3,175
Source: ASME B1.1 - Unified Screw Threads

NPT-Pipe threads

				
				
				Thread Diameter
				Pitch
				Threads
				Core Hole Diameter
				Outer Diameter
						

				
				NPT
				mm
				per inch
				mm
				mm
				

				1/16"
				0,941
				27
				6,00
				7,895
				

				1/8"
				0,941
				27
				8,25
				10,242
				

				1/4"
				1,411
				18
				10,70
				13,616
				

				3/8"
				1,411
				18
				14,10
				17,055
				

				1/2"
				1,814
				14
				17,40
				21,223
				

				3/4"
				1,814
				14
				22,60
				26,568
				

				1"
				2,209
				11,5
				28,50
				33,228
				

				1 1/4"
				2,209
				11,5
				37,00
				41,985
				

				1 1/2"
				2,209
				11,5
				43,50
				48,054
				

				2"
				2,209
				11,5
				55,00
				60,092
				

				2 1/2"
				3,175
				8
				65,50
				72,699
				

				3"
				3,175
				8
				81,50
				88,608
				

				3 1/2"
				3,175
				8
				94,30
				101,316
				

				4"
				3,175
				8
				107,00
				113,973
				

				5"
				3,175
				8
				134,384
				141,300
				

				6"
				3,175
				8
				161,191
				168,275
				

				8"
				3,175
				8
				211,673
				219,075
				

				10"
				1,375
				8
				265,311
				273,050
				

				12"
				1,375
				8
				315,793
				323,850
				

				1" (inch) = 25,4 mm
				

				
Source:
ANSI / ASME B 1.20.1 - Universal pipe thread (inch)
				

				

Thread Diameter	Pitch	Threads	Core Hole Diameter	Outer Diameter
NPT	mm	per inch	mm	mm
1/16"	0,941	27	6,00	7,895
1/8"	0,941	27	8,25	10,242
1/4"	1,411	18	10,70	13,616
3/8"	1,411	18	14,10	17,055
1/2"	1,814	14	17,40	21,223
3/4"	1,814	14	22,60	26,568
1"	2,209	11,5	28,50	33,228
1 1/4"	2,209	11,5	37,00	41,985
1 1/2"	2,209	11,5	43,50	48,054
2"	2,209	11,5	55,00	60,092
2 1/2"	3,175	8	65,50	72,699
3"	3,175	8	81,50	88,608
3 1/2"	3,175	8	94,30	101,316
4"	3,175	8	107,00	113,973
5"	3,175	8	134,384	141,300
6"	3,175	8	161,191	168,275
8"	3,175	8	211,673	219,075
10"	1,375	8	265,311	273,050
12"	1,375	8	315,793	323,850
1" (inch) = 25,4 mm
Source: ANSI / ASME B 1.20.1 - Universal pipe thread (inch)

Whitworth pipe thread - G

Rohrgewinde für nicht im Gewinde dichtende Verbindungen (zylindrisch), außen = G

				
				
				Thread Diameter
				Pitch
				Threads
				Nut Diameter
				Core Hole Diameter
						

				
				G
				mm
				per inch
				mm
				max.
				

				1/8"
				0,907
				28
				8,85
				8,80
				

				1/4"
				1,337
				19
				11,89
				11,80
				

				3/8"
				1,337
				19
				15,39
				15,25
				

				1/2"
				1,814
				14
				19,17
				19,00
				

				5/8"
				1,814
				14
				21,13
				21,00
				

				3/4"
				1,814
				14
				24,66
				24,50
				

				7/8"
				1,814
				14
				28,42
				28,25
				

				1"
				2,309
				11
				30,93
				30,75
				

				1 1/8"
				2,309
				11
				35,58
				35,30
				

				1 1/4"
				2,309
				11
				39,59
				39,25
				

				1 3/8"
				2,309
				11
				42
				41,70
				

				1 1/2"
				2,309
				11
				45,48
				45,25
				

				1 3/4"
				2,309
				11
				51,43
				51,10
				

				2"
				2,309
				11
				57,29
				57,00
				

				2 1/4"
				2,309
				11
				63,39
				63,10
				

				2 1/2"
				2,309
				11
				72,86
				72,60
				

				2 3/4"
				2,309
				11
				79,21
				78,90
				

				3"
				2,309
				11
				85,56
				85,30
				

				3 1/4"
				2,309
				11
				91,66
				91,50
				

				3 1/2"
				2,309
				11
				98,01
				97,70
				

				3 3/4"
				2,309
				11
				104,30
				104,00
				

				4"
				2,309
				11
				110,71
				110,40
				

				1" (inch) ) 25,4 mm
				

				

Thread Diameter	Pitch	Threads	Nut Diameter	Core Hole Diameter
G	mm	per inch	mm	max.
1/8"	0,907	28	8,85	8,80
1/4"	1,337	19	11,89	11,80
3/8"	1,337	19	15,39	15,25
1/2"	1,814	14	19,17	19,00
5/8"	1,814	14	21,13	21,00
3/4"	1,814	14	24,66	24,50
7/8"	1,814	14	28,42	28,25
1"	2,309	11	30,93	30,75
1 1/8"	2,309	11	35,58	35,30
1 1/4"	2,309	11	39,59	39,25
1 3/8"	2,309	11	42	41,70
1 1/2"	2,309	11	45,48	45,25
1 3/4"	2,309	11	51,43	51,10
2"	2,309	11	57,29	57,00
2 1/4"	2,309	11	63,39	63,10
2 1/2"	2,309	11	72,86	72,60
2 3/4"	2,309	11	79,21	78,90
3"	2,309	11	85,56	85,30
3 1/4"	2,309	11	91,66	91,50
3 1/2"	2,309	11	98,01	97,70
3 3/4"	2,309	11	104,30	104,00
4"	2,309	11	110,71	110,40
1" (inch) ) 25,4 mm

Whitworth pipe thread - R

Whitworth taper pipe thread.
Whitworth pipe thread for threaded pipes and fittings. Cylindrical female thread and tapered (taper 1 :16) male thread. A suitable sealant may be used in the thread to ensure a tight connection.

				
				
				Outer Thread
				Inner Thread
				Nominal Size Pipe
				Pitch
				Threads
				Outer Diameter
				Core Hole Diameter
						

				
				R
				Rp
				mm
				mm
				per inch
				mm
				mm
				

				1/16"
				1/16"
				3
				0,907
				28
				7,723
				6,561
				

				1/8"
				1/8"
				6
				0,907
				28
				9,728
				8,566
				

				1/4"
				1/4"
				8
				1,337
				19
				13,157
				11,445
				

				3/8"
				3/8"
				10
				1,337
				19
				16,662
				14,950
				

				1/2"
				1/2"
				15
				1,814
				14
				20,995
				18,631
				

				3/4"
				3/4"
				20
				1,817
				14
				26,441
				24,117
				

				1"
				1"
				25
				2,309
				11
				33,249
				30,291
				

				1 1/4"
				1 1/4"
				32
				2,309
				11
				41,910
				38,952
				

				1 1/2"
				1 1/2"
				40
				2,309
				11
				47,803
				44,845
				

				2"
				2"
				50
				2,309
				11
				59,614
				56,656
				

				2 1/2"
				2 1/2"
				65
				2,309
				11
				75,184
				72,226
				

				3"
				3"
				80
				2,309
				11
				87,884
				84,926
				

				4"
				4"
				100
				2,309
				11
				113,03
				110,072
				

				5"
				5"
				125
				2,309
				11
				138,43
				135,472
				

				6"
				6"
				150
				2,309
				11
				163,83
				160,872
				

				1" (inch) = 25,4 mm
				

				
Sources:
DIN EN ISO 228-1 - Pipe threads for non-threaded connections - Part 1: Dimensions, tolerances and designation
DIN 2999-1 - Whitworth pipe threads for threaded pipes and fittings; cylindrical internal thread and tapered external thread; thread dimensions
				

				

Outer Thread	Inner Thread	Nominal Size Pipe	Pitch	Threads	Outer Diameter	Core Hole Diameter
R	Rp	mm	mm	per inch	mm	mm
1/16"	1/16"	3	0,907	28	7,723	6,561
1/8"	1/8"	6	0,907	28	9,728	8,566
1/4"	1/4"	8	1,337	19	13,157	11,445
3/8"	3/8"	10	1,337	19	16,662	14,950
1/2"	1/2"	15	1,814	14	20,995	18,631
3/4"	3/4"	20	1,817	14	26,441	24,117
1"	1"	25	2,309	11	33,249	30,291
1 1/4"	1 1/4"	32	2,309	11	41,910	38,952
1 1/2"	1 1/2"	40	2,309	11	47,803	44,845
2"	2"	50	2,309	11	59,614	56,656
2 1/2"	2 1/2"	65	2,309	11	75,184	72,226
3"	3"	80	2,309	11	87,884	84,926
4"	4"	100	2,309	11	113,03	110,072
5"	5"	125	2,309	11	138,43	135,472
6"	6"	150	2,309	11	163,83	160,872
1" (inch) = 25,4 mm
Sources: DIN EN ISO 228-1 - Pipe threads for non-threaded connections - Part 1: Dimensions, tolerances and designation DIN 2999-1 - Whitworth pipe threads for threaded pipes and fittings; cylindrical internal thread and tapered external thread; thread dimensions

Round threads

				
				
				Thread
				Outer Diameter
				Bolt Diameter
				Core Hole Diameter
				Pitch
				Threads
					

				Rd
				Rp
				mm
				mm
				mm
				per inch
				

				8
				8,254
				5,46
				5,714
				2,54
				10
				

				9
				9,254
				6,46
				6,714
				2,54
				10
				

				10
				10,254
				7,46
				7,714
				2,54
				10
				

				11
				11,254
				8,46
				8,714
				2,54
				10
				

				12
				12,254
				9,46
				9,714
				2,54
				10
				

				14
				14,318
				10,825
				11,142
				3,175
				8
				

				16
				16,318
				14,166
				12,825
				3,175
				8
				

				18
				18,318
				14,825
				14,142
				3,175
				8
				

				20
				20,318
				16,825
				17,142
				3,175
				8
				

				22
				22,318
				18,825
				19,142
				3,175
				8
				

				24
				24,318
				20,825
				21,142
				3,175
				8
				

				28
				28,318
				24,825
				25,142
				3,175
				8
				

				30
				30,318
				26,825
				27,142
				3,175
				8
				

				32
				32,818
				28,825
				29,142
				3,175
				8
				

				34
				34,318
				30,825
				31,142
				3,175
				8
				

				36
				36,318
				32,825
				33,142
				3,175
				8
				

				38
				38,318
				34,825
				35,142
				3,175
				8
				

				40
				40,423
				35,767
				36,190
				4,233
				6
				

				42
				42,423
				37,767
				38,190
				4,233
				6
				

				44
				44,423
				39,767
				40,190
				4,233
				6
				

				46
				46,423
				41,767
				42,190
				4,233
				6
				

				48
				48,423
				43,767
				44,190
				4,233
				6
				

				50
				50,423
				45,767
				46,190
				4,233
				6
				

				1" (inch) = 25,4 mm
				

				
Source:
DIN 405-1 - Round thread for general use - Part 1: Thread profiles, nominal dimensions
				

				

Thread	Outer Diameter	Bolt Diameter	Core Hole Diameter	Pitch	Threads
Rd	Rp	mm	mm	mm	per inch
8	8,254	5,46	5,714	2,54	10
9	9,254	6,46	6,714	2,54	10
10	10,254	7,46	7,714	2,54	10
11	11,254	8,46	8,714	2,54	10
12	12,254	9,46	9,714	2,54	10
14	14,318	10,825	11,142	3,175	8
16	16,318	14,166	12,825	3,175	8
18	18,318	14,825	14,142	3,175	8
20	20,318	16,825	17,142	3,175	8
22	22,318	18,825	19,142	3,175	8
24	24,318	20,825	21,142	3,175	8
28	28,318	24,825	25,142	3,175	8
30	30,318	26,825	27,142	3,175	8
32	32,818	28,825	29,142	3,175	8
34	34,318	30,825	31,142	3,175	8
36	36,318	32,825	33,142	3,175	8
38	38,318	34,825	35,142	3,175	8
40	40,423	35,767	36,190	4,233	6
42	42,423	37,767	38,190	4,233	6
44	44,423	39,767	40,190	4,233	6
46	46,423	41,767	42,190	4,233	6
48	48,423	43,767	44,190	4,233	6
50	50,423	45,767	46,190	4,233	6
1" (inch) = 25,4 mm
Source: DIN 405-1 - Round thread for general use - Part 1: Thread profiles, nominal dimensions

Threads

Metric threads

UNC-Threads

UNF-Threads

8-UN-Threads

NPT-Pipe threads

Whitworth pipe thread - G

Rohrgewinde für nicht im Gewinde dichtende Verbindungen (zylindrisch), außen = G

Whitworth pipe thread - R

Whitworth taper pipe thread.Whitworth pipe thread for threaded pipes and fittings. Cylindrical female thread and tapered (taper 1 :16) male thread. A suitable sealant may be used in the thread to ensure a tight connection.

Round threads

Whitworth taper pipe thread.
Whitworth pipe thread for threaded pipes and fittings. Cylindrical female thread and tapered (taper 1 :16) male thread. A suitable sealant may be used in the thread to ensure a tight connection.