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MATERIAL & THREADSpecification

Metric ISO 965-1, ISO 965-3 medium fit (6g) for external threads

Imperial Conduit (ET) BS 31 : 1940 (1979), Table A

PG DIN 40430 : 1971

BSPP BS 2779 : 1986 (1973) class A full form for external threads

BSPT BS 21 : 1985 standard threads only as clause 5.4, gauging to clause 5.2 system A

ISO ISO 7/1 : 1982, gauging to ISO 7/2 clause 6.3 for external threads

NPT ANSI / ASME B1.20.1 - 1983 gauging to clause 8.1 for external threads

NPSM ANSI / ASME B1.20.1 - 1983 gauging to clause 9 for external threads

Brass Extruded bar to EN12168: 1998 Grade CuZn39Pb (CW614N) (Previously BS2874: 1986)

Stainless Steel to EN 10088-2:2005 Grade 316L (Previously BS970 Part 1: 1991)

Mild Steel to BS970 Part 1: 1996 Grade 220MO7Pb

Aluminium Extruded bar to EN573-3:2003 Grade AW6082 & AW6262

Aluminium Castings to EN 1706: 1998 Grade ENAC42000. T6 (Previously BS1490 LM25. TF)

Brass Casting to BS1400: 1985 Grade HTB1

MATERIALS

THREAD CONSTRUCTION STANDARDS

ISO METRIC IEC 60423 PG DIN 40430

THREAD REFERENCE 16 20 25 32 40 50 63 75 THREAD REFERENCE PG7 PG9 PG11 PG13.5 PG16 PG21 PG29 PG36

THREAD SIZE M16 M20 M25 M32 M40 M50 M63 M75 THREAD SIZE PG7 PG9 PG11 PG13.5 PG16 PG21 PG29 PG36

THREAD PITCH 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 THREAD PITCH 1.27 1.41 1.41 1.41 1.41 1.59 1.59 1.59

THREAD PER INCH 16.93 16.93 16.93 16.93 16.93 16.93 16.93 16.93 THREAD PER INCH 20.00 18.00 18.00 18.00 18.00 16.00 16.00 16.00

MAJOR DIAMETER MAX 15.97 19.97 24.97 31.97 39.97 49.97 62.97 74.97 MAJOR DIAMETER MAX 12.5 15.2 18.6 20.4 22.5 28.3 37.0 47.0

CLEARANCE HOLE MAX 16.5 20.5 25.5 32.5 40.5 50.5 63.5 75.5 CLEARANCE HOLE MAX 13.0 15.7 19.1 20.9 23.0 28.8 37.5 47.5

NPT ANSI B1.20.1 BSP ISO R/7, BS2779 (BSPP,G,R,PF)

THREAD REFERENCE 050 075 100 125 150 200 250 300 THREAD REFERENCE 050 075 100 125 150 200 250 300

THREAD SIZE 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 THREAD SIZE 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3

THREAD PITCH 1.81 1.81 2.20 2.20 2.20 2.20 3.18 3.18 THREAD PITCH 1.81 1.81 2.31 2.31 2.31 2.31 2.31 2.31

THREAD PER INCH 14.00 14.00 11.5 11.5 11.5 11.5 8 8 THREAD PER INCH 14.00 14.00 11.00 11.00 11.00 11.00 11.00 11

MAJOR DIAMETER MAX 21.34 26.67 33.4 42.16 48.26 60.33 73.03 88.9 MAJOR DIAMETER MAX 20.96 26.44 33.25 41.91 47.80 59.61 75.18 87.88

CLEARANCE HOLE MAX 21.84 27.17 33.9 42.66 48.76 60.83 73.53 89.4 CLEARANCE HOLE MAX 21.46 26.94 33.75 42.41 48.30 60.11 75.68 88.387

NPS ANSI B1.20.1 BSPT ISO R/7, BS21 (BSPT,GK)

THREAD REFERENCE 050 075 100 125 150 200 250 300 THREAD REFERENCE 050 075 100 125 150 200 250 300

THREAD SIZE 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 THREAD SIZE 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3

THREAD PITCH 1.81 1.81 2.20 2.20 2.20 2.20 3.18 3.18 THREAD PITCH 1.81 1.81 2.31 2.31 2.31 2.31 2.31 2.31

THREAD PER INCH 14.00 14.00 11.50 11.50 11.50 11.50 8.00 8.00 THREAD PER INCH 14.00 14.00 11.00 11.00 11.00 11.00 11.00 11

MAJOR DIAMETER MAX 20.9 26.26 32.84 41.6 47.67 59.71 72.16 88.06 MAJOR DIAMETER MAX 20.96 26.44 33.25 41.91 47.80 59.61 75.18 87.88

CLEARANCE HOLE MAX 21.3 26.76 33.34 42.1 48.17 60.21 72.66 88.56 CLEARANCE HOLE MAX 21.46 26.94 33.75 42.41 48.30 60.11 75.68 88.387

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