THREADING SYSTEMS - JEL - 05/2008 - Komet

Thread engagements for BGF
For UNC thread ANSI B1.1, for UNF thread ANSI B1.1 and
for Whitworth pipe thread DIN EN ISO 228 and DIN EN 10226 (previously DIN 2999)
BT
EL
TL
= Drill depth
= Thread engagement
= Full thread length
140° D9 D1
D D3.1 90°
TL
EL
BT
3
BGF
UNC 1,5×D 2,0×D 2,5×D
D1 BT D3.1 D9 EL TL D1 BT D3.1 D9 EL TL D1 BT D3.1 D9 EL TL
1/4-20 UNC 5,08 11,09 6,65 6,83 9,82 8,06 5,08 14,90 6,65 6,83 13,60 11,90 5,08 17,44 6,65 6,83 16,20 14,40
5/16-18 UNC 6,53 13,77 8,24 8,56 12,36 10,34 6,53 18,00 8,24 8,56 16,60 14,60 6,53 22,24 8,24 8,56 20,83 18,80
3/8-16 UNC 7,94 16,99 9,83 10,23 15,40 13,20 7,94 21,80 9,83 10,23 20,20 18,00 7,94 26,51 9,83 10,23 24,93 22,73
1/2-13 UNC 10,75 22,56 13,00 13,72 20,60 18,10 10,80 28,40 13,00 13,72 26,50 24,00 10,80 34,28 13,00 13,72 32,33 29,86
UNF 1,5×D 2,0×D 2,5×D
D1 BT D3.1 D9 EL TL D1 BT D3.1 D9 EL TL D1 BT D3.1 D9 EL TL
1/4-28 UNF 5,44 10,68 6,65 6,70 9,78 8,52 5,44 14,30 6,65 6,70 13,40 12,10 5,44 17,05 6,65 6,70 16,10 14,90
5/16-24 UNF 6,88 13,54 8,24 8,40 12,50 11,00 6,88 17,80 8,24 8,40 16,70 15,20 6,88 20,95 8,24 8,40 19,90 18,40
3/8-24 UNF 8,47 15,67 9,83 10,01 14,61 13,07 8,47 19,90 9,83 10,01 18,80 17,30 8,47 25,19 9,83 10,01 24,10 22,60
1/2-20 UNF 11,43 20,08 13,00 13,35 18,80 16,90 11,40 26,40 13,00 13,35 25,20 23,30 11,40 32,78 13,00 13,35 31,50 29,60
G 1,5×D 2,0×D 2,5×D
D1 BT D3.1 D9 EL TL D1 BT D3.1 D9 EL TL D1 BT D3.1 D9 EL TL
G1/8-28 8,82 15,25 10,03 10,12 14,34 13,04 8,82 20,70 10,03 10,12 19,80 18,50 8,82 25,23 10,03 10,12 24,30 23,00
G1/4-19 11,82 20,97 13,46 13,52 19,63 17,87 11,80 27,70 13,46 13,52 26,30 24,60 11,80 34,44 13,46 13,52 33,10 31,30
We reserve the right to make technical alterations Please see note on page 152
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