Threads: Details of Standard Thread Forms - Maryland Metrics

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Details of Standard Thread Forms

nom. size

ISO 228 DIN 259 BS 2779 JIS B0202

(BSPP, BSPF)

In Japan this thread is known as (PF) Use prefix G for parallel thread. example: G1/2

t.p.i. = threadsperinch

In Japan this thread is knownas(PT)

Use prefix R for taperedthread. example: R1/2

inches 1/16 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1 1 1/4 1 1/2 1 3/4 2 2 1/4 2 1/2 2 3/4 3 3 1/4 3 1/2 3 3/4 4

h

Taper 1 in16ondiameter (shown exaggeratedindiagram)

basic basic basic basic reccommended depth major effective minor tap drill of diameter diameter diameter size thread size Rp size G inches inches inches inches mm mm 0.0229 0.304 0.2812 0.2583 6.60 6.80 0.0229 0.383 0.3601 0.3372 8.60 8.80 0.0337 0.518 0.4843 0.4506 11.50 11.80 0.0337 0.656 0.6223 0.5886 15.00 15.25 0.0457 0.825 0.7793 0.7336 18.50 19.00 0.0457 0.902 0.8563 0.8106 21.00 0.0457 1.041 0.9953 0.9496 24.00 24.50 0.0457 1.189 1.1433 1.0976 23.25 0.0582 1.309 1.2508 1.1926 30.25 30.75 0.0582 1.650 1.5918 1.5336 39.00 39.50 0.0582 1.882 1.8238 1.7656 45.00 45.00 0.0582 2.116 2.0578 1.9996 51.00 0.0582 2.347 2.2888 2.2306 56.50 57.00 0.0582 2.587 2.5288 2.4706 NO SIZES OF 0.0582 2.960 2.9018 2.8436 B.S. (BRITISH 0.0582 3.210 3.1518 3.0936 STANDARD) 0.0582 3.460 3.4018 3.3436 DRILLS ARE 0.0582 3.700 3.6418 3.5836 RECCOMMENDED 0.0582 3.950 3.8918 3.8336 IN B.S. 1157:1975 0.0582 4.200 4.1418 4.0836 FOR THIS 0.0582 4.450 4.3918 4.3336 RANGE

28 28 19 19 14 14 14 14 11 11 11 11 11 11 11 11 11 11 11 11 11 nom. size

ISO 7 DIN2999 BS 21 JIS B0203

(BSPT)

t.p.i.

inches 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2

t.p.i.

28 28 19 19 14 14 11 11 11 11 11

nom. size

Taper 1 in16ondiameter (shownexaggerated indiagram)

Metric Pitch P= 25.4 tpi THDFRM2.CDR

t.p.i.

11 11 11 11

27 27 18 18 14 14 1/2 1/2 1/2 1/2 8

designation t.p.i.

STEEL CONDUIT THREAD (Pg) (DIN 40430) (PANZERROHR-GEWINDE) Pg is the Continental European electrical conduit thread. (FortheUK,the electrical thread now in use is I.S.O. Metric fine.)

inches 1/16 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2

basic basic diameters at reccmd. depth gauge plane* tap drill of major effective minor size thread diameter diameter diameter inches inches inches inches mm 0.0229 0.304 0.2812 0.2583 6.40 0.0229 0.383 0.3601 0.3372 8.40 0.0337 0.518 0.4843 0.4506 11.20 0.0337 0.656 0.6223 0.5886 14.75 0.0457 0.825 0.7793 0.7336 18.25 0.0457 1.041 0.9953 0.9496 23.75 0.0582 1.309 1.2508 1.1926 30.00 0.0582 1.650 1.5918 1.5336 38.50 0.0582 1.882 1.8238 1.7656 44.50 0.0582 2.347 2.2888 2.2306 56.00 0.0582 2.960 2.9018 2.8436 71.00

P

r

80o

H

H1 = 0.767 H

0.1H

H1 0.1H

H = 0.595875 P TECH2

Mail to: P.O. BOX 261, OWINGS MILLS, MARYLAND 21117

r = 0.107P

2

Pg7 Pg9 Pg11 Pg14 13.5 Pg16 Pg21 Pg29 Pg36 Pg42 Pg48

20 18 18 18 18 15 16 16 16 16

basic depth of thread

outside diameter of pipe

inches 0.0296 0.0296 0.0444 0.0444 0.0571 0.0571 0.0696 0.0696 0.0696 0.0696 0.1000

inches 0.3125 0.405 0.540 0.675 0.840 1.050 1.315 1.660 1.900 2.375 2.875

basic basic major pitch diameter diameter mm 12.50 15.20 18.60 20.40 22.50 28.30 37.00 47.00 54.00 59.30

mm 11.89 14.53 17.93 19.73 21.83 27.54 36.24 46.24 53.24 58.54

effective diameter

basic reccmd. minor tap drill at small end diameter size of external

thread inches 0.2712 0.3635 0.4774 0.6120 0.7584 0.9677 1.2136 1.5571 1.7961 2.2690 2.7195 basic minor diameter mm 11.28 13.86 17.26 19.06 21.16 26.78 35.48 45.48 52.48 57.78

inches 0.2812 0.3736 0.4916 0.6270 0.7784 0.9889 1.2386 1.5834 1.8223 2.2963 2.7622

mm 6.30 8.70 11.10 14.50 18.00 23.25 29.00 38.00 44.00 56.00 67.00

reccmd. tap drill size mm 11.30 13.90 17.30 19.10 21.20 26.80 35.50 45.50 52.50 57.80

clearance drill size mm 12.60 15.30 18.70 20.50 22.75 28.75 37.25 47.25 54.25 59.55

P11K

Warehouse: 6119 OAKLEAF AVENUE, BALTIMORE, MARYLAND 21215