THREADING SYSTEMS - JEL - 05/2008 - Komet

Thread engagements for MGF
For UNF thread ANSI B1.1, for NPT/NPTF thread ANSI B2.1 and for Whitworth pipe thread DIN
EN ISO 228 and DIN EN 10226 (previously DIN 2999)
BT
TL
= Min. drill depth
= Full thread length
1
MGF
D1 D D3.1 90°
TL
BT
UNF 1,5×D 2,0×D 2,5×D
D1 BT D3.1 TL D1 BT D3.1 TL D1 BT D3.1 TL
1/4-28 UNF 5,44 11,20 6,65 10,20 5,44 14,84 6,65 13,85 5,44 17,56 6,65 16,57
5/16-24 UNF 6,88 13,00 8,24 11,90 6,88 17,23 8,24 16,18 6,88 21,47 8,24 20,40
3/8-24 UNF 8,47 15,16 9,83 14,09 8,47 20,42 9,83 19,35 8,47 25,70 9,83 24,60
7/16-20 UNF 9,84 18,05 11,41 16,90 9,84 23,13 11,41 21,99 9,84 29,48 11,41 28,30
1/2-20 UNF 11,43 21,01 13,00 19,10 11,43 27,36 13,00 25,50 11,43 33,71 13,00 31,80
NPT
Standard length
D1 BT D3.1 TL
1/16-27 NPT 6,15 11,36 8,70 9,00
1/8-27 NPT 8,43 11,36 11,10 9,00
1/4-18 NPT 11,13 16,77 14,50 13,50
3/8-18 NPT 14,27 16,77 17,90 13,50
NPTF
Standard length
D1 BT D3.1 TL
1/16-27 NPTF 6,10 11,36 8,70 9,00
1/8-27 NPTF 8,40 11,36 11,10 9,00
1/4-18 NPTF 11,00 16,77 14,50 13,50
3/8-18 NPTF 14,50 16,77 17,90 13,50
G 1,5×D 2,0×D 2,5×D
D1 BT D3.1 TL D1 BT D3.1 TL D1 BT D3.1 TL
G1/8-28 8,82 15,81 10,03 14,67 8,82 21,25 10,03 20,11 8,82 25,84 10,03 24,70
G1/4-19 11,82 21,74 13,46 20,37 11,82 28,43 13,46 27,06 11,82 35,18 13,46 33,80
G3/8-19 15,32 27,22 16,96 25,60 15,32 35,24 16,96 33,62 15,32 43,26 16,96 41,60
We reserve the right to make technical alterations
Please see note on page 152
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