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Thread Types & Basic Profile
Thread Types & Basic Profile / Applicable Toolholders & Inserts
Basic Prole Symbol Type Applicable Insert Applicable Toolholder
(Previous Symbol)
Internal
H 30 30 Internal External Internal External Internal External Internal External Internal External Internal External Internal External E ISO KTN -
H 16E ISO-TF KTNSR -16
2 60 16E M02
External M 16E 60 (-TS)
H1 H
Metric 8 P d1 D1 TT43E M KTT -
d2 D2
dD TT 60 KTTX
H TTX32 60 SIN -16F, S -KTTX 16
2 CIN
H I ISO
4 I ISO-TF KITG
I 60 ( )(-TS) S
e.g.) S- (E)
M30 S-
TT 60 T-
-STWP 11-
TPGB11 () (E)
UN E UN-TF KTN -
UNC KTNS -16
H UNF 16E 60 (-TS)
8 UNEF KTT -
KTTX -16F, S
Unied H H1 Internal d1 D1 e.g.) TT 60 SIN S- (E)
H d2 D2 -16 UNF CIN S-
2 30 30 dD TTX32 60 KITG T- -KTTX 16
60
H I UN-TF S -STWP 11- (E)
2 External
H P I 60 ( )(-TS)
4
TT L/R60
TPGB11 ()
Parallel Pipe External: G (PF) E W KTN -
H Internal: G (PF) 16E W-TF KTNSR -16
HH 16E 55
22 r d1 D1
H hH Internal d2 D2
66 dD
Rp (PS) TT 55 KTT -
J 27.5 27.5 r TTX32 55 KTTX -16F, S -KTTX 16
55 IW
External e.g.) I W-TF SIN S- (E)
G (PF ) I 55 ( ) CIN S-
P
TT L/R55 KITG T-
Threading Whitworth HH H1 H 0.0769H 6 r d1 D1 W EW KTN -
22 Internal D1 16E W-TF KTNS -16
d2 D2 e.g.) 16E 55
H dD W TT 55 KTT -
TTX32 55 KTTX -16F, S
27.5 27.5 r -KTTX 16
55 IW SIN S- (E)
H6 I W-TF CIN S-
External I 55 ( )
P TT L/R55 KITG T-
External: R (PT) E PT
16E PT-TS
Tapered Pipe h r Internal (BSPT) TT 55 * KTN -
h Internal: Rc (PT) TTX32 55 * KTNS -16
H 2 KTT
HH (BSPT) I PT KTTX -
22 27.5 27.5 r I PT-TF SIN -16F, S -KTTX 16
55 TT L/R55 * CIN S- (E)
h S-
2 KITG
T-
External 1 47 e.g.)
P R (PT )
American National Internal E NPT KTN -
Tapered Pipe KTNS -16
Fr NPT
H
fr h fc fc fr Fc P
Fc
Fr 30 30 60 External e.g.) I NPT SIN S-
1 47 -18 NPT CIN S-
Trapezoidal 30° H 0.366P Tr E Tr KTN -
H KTNS -16
2 Internal e.g.)
15 15 d1 D1 Tr 263
H1 d2 D2
H1 H1 30 dD
22 External
0.366P
H SIN S-
2 P CIN S-
I Tr
* For the case when the thread root’s corner-R(r) can be smaller than the standard.
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