Thread Size Table

Thread size comparison table for hydraulic equipment. The table includes DIN metric, BSP, JIC, NPTF, SAE UNF and ORFS thread sizes organized by external and internal thread crest diameters.

Male thread, crest mm(±1mm)

Female thread, crest mm(±1mm)

Male thread, crest mm (±1mm)	Female thread, crest mm (±1mm)	Threads/inch	Sealing face	DIN metric	BSP (R)	JIC 37°	NPTF	SAE UNF 45°	UNF O-ring seal	Tube fitting L/S	ORFS (UN)
9,7	8,6	28	-3		R ⅛"
9,7	8,6	27	-3				⅛-27
10,0	8,4			M10 × 1,5
10,0	8,7	24	-3						5/16-24
11,1	9,7	20	-4			7/16-20		7/16-20	7/16-20
12,0	10,2			M12 × 1,5						L6
12,7	11,3	20	-5			½-20		½-20	½-20
13,2	11,4	19			R ¼"
13,1	11,4	18					¼-18
14,1	12,5	18	-4								9/16-18
14,0	12,2			M14 × 1,5						L8, S6
14,3	12,8	18	-6			9/16-18			9/16-18
15,9	14,6	18				⅝-18
16,0	14,2			M16 × 1,5						L10, S8
16,7	14,9	19			R ⅜"
16,6	14,9	18					⅜-18
17,3	16,0	16	-6								11/16-16
18,0	16,2			M18 × 1,5						L12, S10
19,1	17,6	16	-8			¾-16		¾-16	¾-16
20,0	18,2			M20 × 1,5						S12
20,5	19,0	16	-8								13/16-16
20,9	18,5	14			R ½"		½-14
22,0	20,2			M22 × 1,5						L15, S14
22,2	20,5	14	-10			⅞-14		⅞-14	⅞-14
22,9	20,6	14			R ⅝"
24,0	22,2			M24 × 1,5						S16
25,2	23,2	14	-10								1-14
26,0	24,2			M26 × 1,5						L18
26,4	24,1	14			R ¾"		¾-14
26,9	24,9	12	-12					1 1/16-12	1 1/16-12		1 1/16-12
26,9	25,4	14				1 1/16-14
30,0	27,9			M30 × 2						L22, S20
30,0	28,0	12	-12								1 3/16-12
33,2	30,3	11			R 1"
33,3	31,3	12	-16			1 5/16-12		1 5/16-12	1 5/16-12		1 5/16-12
33,4	30,3	11,5					1-11½
36,0	33,9			M35 × 2						L28, S25
36,3	34,5	12	-16								1 7/16-12
41,3	39,2	12	-20			1 ⅝-12		1 ⅝-12	1 ⅝-12		1 5/8-12
42,0	39,5			M42 × 2						S30
41,9	38,9	11			R 1¼"
42,0	39,2	11,5					1¼-11½
42,7	40,8	12	-20								1 11/16-12
45,0	42,5			M45 × 2						L35
47,6	45,6	12	-24			1 ⅞-12		1 ⅞-12	1 ⅞-12		1 7/8-12
47,8	44,8	11			R 1½"
47,9	45,1	11,5					1½-11½
50,6	48,8	12	-24								2-12
52,0	49,5			M52 × 2						L42, S38
59,6	56,6	11			R 2"
59,7	57,0	11,5					2-11½
63,5	61,5	12	-32			2½-12		2½-12	2½-12		2 1/2-12
78,2	72,2	11	-40		R 2½"
87,9	84,9	11	-48		R 3"

Male thread, crest mm:9,7

Female thread, crest mm:8,6

Threads/inch:28

Sealing face:-3

DIN metric:–

BSP (R):R ⅛"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:9,7

Female thread, crest mm:8,6

Threads/inch:27

Sealing face:-3

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:⅛-27

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:10,0

Female thread, crest mm:8,4

Threads/inch:–

Sealing face:–

DIN metric:M10 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:10,0

Female thread, crest mm:8,7

Threads/inch:24

Sealing face:-3

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:5/16-24

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:11,1

Female thread, crest mm:9,7

Threads/inch:20

Sealing face:-4

DIN metric:–

BSP (R):–

JIC 37°:7/16-20

NPTF:–

SAE UNF 45°:7/16-20

UNF O-ring seal:7/16-20

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:12,0

Female thread, crest mm:10,2

Threads/inch:–

Sealing face:–

DIN metric:M12 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L6

ORFS (UN):–

Male thread, crest mm:12,7

Female thread, crest mm:11,3

Threads/inch:20

Sealing face:-5

DIN metric:–

BSP (R):–

JIC 37°:½-20

NPTF:–

SAE UNF 45°:½-20

UNF O-ring seal:½-20

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:13,2

Female thread, crest mm:11,4

Threads/inch:19

Sealing face:–

DIN metric:–

BSP (R):R ¼"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:13,1

Female thread, crest mm:11,4

Threads/inch:18

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:¼-18

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:14,1

Female thread, crest mm:12,5

Threads/inch:18

Sealing face:-4

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):9/16-18

Male thread, crest mm:14,0

Female thread, crest mm:12,2

Threads/inch:–

Sealing face:–

DIN metric:M14 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L8, S6

ORFS (UN):–

Male thread, crest mm:14,3

Female thread, crest mm:12,8

Threads/inch:18

Sealing face:-6

DIN metric:–

BSP (R):–

JIC 37°:9/16-18

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:9/16-18

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:15,9

Female thread, crest mm:14,6

Threads/inch:18

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:⅝-18

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:16,0

Female thread, crest mm:14,2

Threads/inch:–

Sealing face:–

DIN metric:M16 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L10, S8

ORFS (UN):–

Male thread, crest mm:16,7

Female thread, crest mm:14,9

Threads/inch:19

Sealing face:–

DIN metric:–

BSP (R):R ⅜"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:16,6

Female thread, crest mm:14,9

Threads/inch:18

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:⅜-18

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:17,3

Female thread, crest mm:16,0

Threads/inch:16

Sealing face:-6

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):11/16-16

Male thread, crest mm:18,0

Female thread, crest mm:16,2

Threads/inch:–

Sealing face:–

DIN metric:M18 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L12, S10

ORFS (UN):–

Male thread, crest mm:19,1

Female thread, crest mm:17,6

Threads/inch:16

Sealing face:-8

DIN metric:–

BSP (R):–

JIC 37°:¾-16

NPTF:–

SAE UNF 45°:¾-16

UNF O-ring seal:¾-16

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:20,0

Female thread, crest mm:18,2

Threads/inch:–

Sealing face:–

DIN metric:M20 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:S12

ORFS (UN):–

Male thread, crest mm:20,5

Female thread, crest mm:19,0

Threads/inch:16

Sealing face:-8

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):13/16-16

Male thread, crest mm:20,9

Female thread, crest mm:18,5

Threads/inch:14

Sealing face:–

DIN metric:–

BSP (R):R ½"

JIC 37°:–

NPTF:½-14

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:22,0

Female thread, crest mm:20,2

Threads/inch:–

Sealing face:–

DIN metric:M22 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L15, S14

ORFS (UN):–

Male thread, crest mm:22,2

Female thread, crest mm:20,5

Threads/inch:14

Sealing face:-10

DIN metric:–

BSP (R):–

JIC 37°:⅞-14

NPTF:–

SAE UNF 45°:⅞-14

UNF O-ring seal:⅞-14

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:22,9

Female thread, crest mm:20,6

Threads/inch:14

Sealing face:–

DIN metric:–

BSP (R):R ⅝"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:24,0

Female thread, crest mm:22,2

Threads/inch:–

Sealing face:–

DIN metric:M24 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:S16

ORFS (UN):–

Male thread, crest mm:25,2

Female thread, crest mm:23,2

Threads/inch:14

Sealing face:-10

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):1-14

Male thread, crest mm:26,0

Female thread, crest mm:24,2

Threads/inch:–

Sealing face:–

DIN metric:M26 × 1,5

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L18

ORFS (UN):–

Male thread, crest mm:26,4

Female thread, crest mm:24,1

Threads/inch:14

Sealing face:–

DIN metric:–

BSP (R):R ¾"

JIC 37°:–

NPTF:¾-14

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:26,9

Female thread, crest mm:24,9

Threads/inch:12

Sealing face:-12

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:1 1/16-12

UNF O-ring seal:1 1/16-12

Tube fitting L/S:–

ORFS (UN):1 1/16-12

Male thread, crest mm:26,9

Female thread, crest mm:25,4

Threads/inch:14

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:1 1/16-14

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:30,0

Female thread, crest mm:27,9

Threads/inch:–

Sealing face:–

DIN metric:M30 × 2

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L22, S20

ORFS (UN):–

Male thread, crest mm:30,0

Female thread, crest mm:28,0

Threads/inch:12

Sealing face:-12

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):1 3/16-12

Male thread, crest mm:33,2

Female thread, crest mm:30,3

Threads/inch:11

Sealing face:–

DIN metric:–

BSP (R):R 1"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:33,3

Female thread, crest mm:31,3

Threads/inch:12

Sealing face:-16

DIN metric:–

BSP (R):–

JIC 37°:1 5/16-12

NPTF:–

SAE UNF 45°:1 5/16-12

UNF O-ring seal:1 5/16-12

Tube fitting L/S:–

ORFS (UN):1 5/16-12

Male thread, crest mm:33,4

Female thread, crest mm:30,3

Threads/inch:11,5

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:1-11½

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:36,0

Female thread, crest mm:33,9

Threads/inch:–

Sealing face:–

DIN metric:M35 × 2

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L28, S25

ORFS (UN):–

Male thread, crest mm:36,3

Female thread, crest mm:34,5

Threads/inch:12

Sealing face:-16

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):1 7/16-12

Male thread, crest mm:41,3

Female thread, crest mm:39,2

Threads/inch:12

Sealing face:-20

DIN metric:–

BSP (R):–

JIC 37°:1 ⅝-12

NPTF:–

SAE UNF 45°:1 ⅝-12

UNF O-ring seal:1 ⅝-12

Tube fitting L/S:–

ORFS (UN):1 5/8-12

Male thread, crest mm:42,0

Female thread, crest mm:39,5

Threads/inch:–

Sealing face:–

DIN metric:M42 × 2

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:S30

ORFS (UN):–

Male thread, crest mm:41,9

Female thread, crest mm:38,9

Threads/inch:11

Sealing face:–

DIN metric:–

BSP (R):R 1¼"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:42,0

Female thread, crest mm:39,2

Threads/inch:11,5

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:1¼-11½

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:42,7

Female thread, crest mm:40,8

Threads/inch:12

Sealing face:-20

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):1 11/16-12

Male thread, crest mm:45,0

Female thread, crest mm:42,5

Threads/inch:–

Sealing face:–

DIN metric:M45 × 2

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L35

ORFS (UN):–

Male thread, crest mm:47,6

Female thread, crest mm:45,6

Threads/inch:12

Sealing face:-24

DIN metric:–

BSP (R):–

JIC 37°:1 ⅞-12

NPTF:–

SAE UNF 45°:1 ⅞-12

UNF O-ring seal:1 ⅞-12

Tube fitting L/S:–

ORFS (UN):1 7/8-12

Male thread, crest mm:47,8

Female thread, crest mm:44,8

Threads/inch:11

Sealing face:–

DIN metric:–

BSP (R):R 1½"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:47,9

Female thread, crest mm:45,1

Threads/inch:11,5

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:1½-11½

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:50,6

Female thread, crest mm:48,8

Threads/inch:12

Sealing face:-24

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):2-12

Male thread, crest mm:52,0

Female thread, crest mm:49,5

Threads/inch:–

Sealing face:–

DIN metric:M52 × 2

BSP (R):–

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:L42, S38

ORFS (UN):–

Male thread, crest mm:59,6

Female thread, crest mm:56,6

Threads/inch:11

Sealing face:–

DIN metric:–

BSP (R):R 2"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:59,7

Female thread, crest mm:57,0

Threads/inch:11,5

Sealing face:–

DIN metric:–

BSP (R):–

JIC 37°:–

NPTF:2-11½

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:63,5

Female thread, crest mm:61,5

Threads/inch:12

Sealing face:-32

DIN metric:–

BSP (R):–

JIC 37°:2½-12

NPTF:–

SAE UNF 45°:2½-12

UNF O-ring seal:2½-12

Tube fitting L/S:–

ORFS (UN):2 1/2-12

Male thread, crest mm:78,2

Female thread, crest mm:72,2

Threads/inch:11

Sealing face:-40

DIN metric:–

BSP (R):R 2½"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Male thread, crest mm:87,9

Female thread, crest mm:84,9

Threads/inch:11

Sealing face:-48

DIN metric:–

BSP (R):R 3"

JIC 37°:–

NPTF:–

SAE UNF 45°:–

UNF O-ring seal:–

Tube fitting L/S:–

ORFS (UN):–

Thread Standard Explanations

DIN metric - DIN ISO metric thread, used in European hydraulic components
BSP (R) - British Standard Pipe, parallel thread (R = taper, RK = parallel)
JIC 37° - JIC 37° flare fitting, American standard
NPTF - National Pipe Thread Fuel, American tapered thread
SAE UNF 45° - Society of Automotive Engineers UNF 45° flare
UNF O-ring seal - UNF threaded O-ring sealed connection, DASH size indicates tube OD in sixteenths of an inch
Tube fitting L/S - DIN 2353 tube fittings L-series (light) and S-series (heavy)
ORFS (UN) - O-Ring Face Seal, American flat face seal connection

Male thread, crest mm

(±1mm)

Female thread, crest mm

(±1mm)

Threads/inch

Sealing face

DIN metric

BSP (R)

JIC 37°

NPTF

SAE UNF 45°

UNF O-ring seal

Tube fitting L/S

ORFS (UN)

9,7

8,6

-3

R ⅛"

9,7

8,6

-3

⅛-27

10,0

8,4

M10 × 1,5

10,0

8,7

-3

5/16-24

11,1

9,7

-4

7/16-20

12,0

10,2

M12 × 1,5

12,7

11,3

-5

½-20

13,2

11,4

R ¼"

13,1

11,4

¼-18

14,1

12,5

-4

9/16-18

14,0

12,2

M14 × 1,5

L8, S6

14,3

12,8

-6

9/16-18

15,9

14,6

⅝-18

16,0

14,2

M16 × 1,5

L10, S8

16,7

14,9

R ⅜"

16,6

14,9

⅜-18

17,3

16,0

-6

11/16-16

18,0

16,2

M18 × 1,5

L12, S10

19,1

17,6

-8

¾-16

20,0

18,2

M20 × 1,5

S12

20,5

19,0

-8

13/16-16

20,9

18,5

R ½"

½-14

22,0

20,2

M22 × 1,5

L15, S14

22,2

20,5

-10

⅞-14

22,9

20,6

R ⅝"

24,0

22,2

M24 × 1,5

S16

25,2

23,2

-10

1-14

26,0

24,2

M26 × 1,5

L18

26,4

24,1

R ¾"

¾-14

26,9

24,9

-12

1 1/16-12

26,9

25,4

1 1/16-14

30,0

27,9

M30 × 2

L22, S20

30,0

28,0

-12

1 3/16-12

33,2

30,3

R 1"

33,3

31,3

-16

1 5/16-12

33,4

30,3

11,5

1-11½

36,0

33,9

M35 × 2

L28, S25

36,3

34,5

-16

1 7/16-12

41,3

39,2

-20

1 ⅝-12

1 5/8-12

42,0

39,5

M42 × 2

S30

41,9

38,9

R 1¼"

42,0

39,2

11,5

1¼-11½

42,7

40,8

-20

1 11/16-12

45,0

42,5

M45 × 2

L35

47,6

45,6

-24

1 ⅞-12

1 7/8-12

47,8

44,8

R 1½"

47,9

45,1

11,5

1½-11½

50,6

48,8

-24

2-12

52,0

49,5

M52 × 2

L42, S38

59,6

56,6

R 2"

59,7

57,0

11,5

2-11½

63,5

61,5

-32

2½-12

2 1/2-12

78,2

72,2

-40

R 2½"

87,9

84,9

-48

R 3"

Thread Standard Explanations

DIN metric - DIN ISO metric thread, used in European hydraulic components

BSP (R) - British Standard Pipe, parallel thread (R = taper, RK = parallel)

JIC 37° - JIC 37° flare fitting, American standard

NPTF - National Pipe Thread Fuel, American tapered thread

SAE UNF 45° - Society of Automotive Engineers UNF 45° flare

UNF O-ring seal - UNF threaded O-ring sealed connection, DASH size indicates tube OD in sixteenths of an inch

Tube fitting L/S - DIN 2353 tube fittings L-series (light) and S-series (heavy)

ORFS (UN) - O-Ring Face Seal, American flat face seal connection