MATERIAL & THREAD

MATERIALS
Brass Extruded bar to EN12168: 1998 Grade CuZn39Pb (CW614N) (Previously BS2874: 1986)
Stainless Steel to EN10088-2:2005 Grade 316L (Previously BS970 Part 1 : 1991)
Mild Steel to BS970 Part 1 : 1996 Grade 220MO7Pb
Aluminium Extruded Bar to EN573-2:2003 Grade AW6082 & AW6262
Aluminium Castings to EN1706:1998 Grade ENAC42000. T6 (Previously BS1490 LM25. TF
Brass Casting to BS1400:1985 Grade HTB1
THREAD CONSTRUCTION STANDARDS
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 guaging to clause 8.1 for external threads
NPSM ANSI / ASME B1.20.1 - 1983 guaging to clause 9 for external threads
ISO METRIC IEC 60423
THREAD REFERENCE 16 20 25 32 40 50 63 75
THREAD SIZE M16 M20 M25 M32 M40 M50 M63 M75
THREAD PITCH 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
THREAD PER INCH 16.93 16.93 16.93 16.93 16.93 16.93 16.93 16.93
MAJOR DIAMETER MAX 15.97 19.97 24.97 31.97 39.97 49.97 62.97 74.97
CLEARANCE HOLE Ø MAX 16.5 20.5 25.5 32.5 40.5 50.5 63.5 75.5
PG DIN 40430
THREAD REFERENCE PG7 PG9 PG11 PG13.5 PG16 PG21 PG29 PG36
THREAD SIZE PG7 PG9 PG11 PG13.5 PG16 PG21 PG29 PG36
THREAD PITCH 1.27 1.41 1.41 1.41 1.41 1.59 1.59 1.59
THREAD PER INCH 20.00 18.00 18.00 18.00 18.00 16.00 16.00 16.00
MAJOR DIAMETER MAX 12.5 15.2 18.6 20.4 22.5 28.3 37.0 47.0
CLEARANCE HOLE Ø MAX 13.0 15.7 19.1 20.9 23.0 28.8 37.5 47.5
NPT ANSI B1.20.1
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 PITCH 1.81 1.81 2.20 2.20 2.20 2.20 3.18 3.18
THREAD PER INCH 14.00 14.00 11.50 11.50 11.50 11.50 8.00 8.00
MAJOR DIAMETER MAX 21.34 26.67 33.40 42.16 48.26 60.33 73.03 88.90
CLEARANCE HOLE Ø MAX 21.84 27.17 33.90 42.66 48.76 60.83 73.53 89.40
NPSN ANSI B1.20.1
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 PITCH 1.81 1.81 2.20 2.20 2.20 2.20 3.18 3.18
THREAD PER INCH 14.00 14.00 11.50 11.50 11.50 11.50 8.00 8.00
MAJOR DIAMETER MAX 20.90 26.67 32.84 41.60 47.67 59.71 72.16 88.06
CLEARANCE HOLE Ø MAX 21.30 26.76 33.34 42.10 48.17 60.21 72.66 88.56
BSP ISO R/7, BS2779 (BSPP, G, R, PF)
THREAD REFERENCE 050 075 100 125 150 200 250 300
THREAD REFERENCE 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 PER INCH 14.00 14.00 11.00 11.00 11.00 11.00 11.00 11.00
MAJOR DIAMETER MAX 20.96 26.44 33.25 41.91 47.80 59.61 75.18 87.88
CLEARANCE HOLE Ø MAX 21.46 26.94 33.75 42.41 48.30 60.11 75.68 88.39
BSP ISO R/7, BS21 (BSPT, GK)
THREAD REFERENCE 050 075 100 125 150 200 250 300
THREAD REFERENCE 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 PER INCH 14.00 14.00 11.00 11.00 11.00 11.00 11.00 11.00
MAJOR DIAMETER MAX 20.96 26.44 33.25 41.91 47.80 59.61 75.18 87.88
CLEARANCE HOLE Ø MAX 21.46 26.94 33.75 42.41 48.30 60.11 75.68 88.39