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Identifying Threads
Pipe Threads
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LSH WKUHDGV DUH HLWKHU WDSHUHG RU VWUDLJKW SDUDOOHO
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Tapered threads
7
DSHUHG WKUHDGV DUH WKH PRVW FRPPRQ W\SH RI WKUHDG DYDLODEOH $V WKH QDPH LPSOLHV WKH\
KDYH D VOLJKW WDSHU :KHQ PDWHG WRJHWKHU DQG WLJKWHQHG WKH WKUHDGV FRPSUHVV DQG PD\ IRUP D
VHDO 8VXDOO\ D WKUHDG VHDODQW LV UHTXLUHG 7KH PDWLQJ WKUHDGV ERWK KROG WKH ¿WWLQJ LQ SODFH DQG
VHDO WKH FRQQHFWLRQ 7KH PRVW ZLGHO\ XVHG SLSH WKUHDGV LQ 1RUWK $PHULFD DUH 137 1DWLRQDO
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LSH 7DSHU 6RPH FRQIXVLRQ PD\ UHVXOW IURP WKH XVH RI 137 )37 DQG 037 LQ GHVFULELQJ
WKUHDGV %RWK )37 DQG 037 DUH 137 WKUHDGV ZLWK )37 PHDQLQJ IHPDOH WKUHDGV LQWHUQDO DQG
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PHDQLQJ PDOH WKUHDGV H[WHUQDO
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U\VHDO WKUHDGV DUH PRGL¿HG 137 WKUHDGV ZKLFK DUH OHVV OLNHO\ WR OHDN ZLWKRXW D
VHDODQW )RU D OHDN IUHH VHDO ZH UHFRPPHQG XVLQJ D VHDODQW FRPSRXQG RU 37)( WDSH <RX
FDQ XVH 137) WKUHDGV ZLWK 137 WKUHDGV EXW \RX OO ORVH VRPH RI WKH OHDN IUHH FKDUDFWHULVWLFV
Straight threads
6
WUDLJKW SDUDOOHO WKUHDGV DUH XVHG IRU PHFKDQLFDO MRLQLQJ 7KH\ VHUYH RQH SXUSRVH WR
KROG D ¿WWLQJ LQ SODFH $V D UHVXOW DQ 2 ULQJ HODVWRPHU KDUG PHWDO VHDO RU D VRIW VHDW VHDO LV
UHTXLUHG 6WUDLJKW SLSH WKUHDGV LQFOXGH 1360 1DWLRQDO 3LSH 6WUDLJKW 0HFKDQLFDO DQG 136+
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NPT vs. BSP (British Standard Pipe)
tapered threads
straight threads
BSPT/BSPP threads
NPT threads
%63
WKUHDGV DUH FRPPRQ LQ PDQ\ FRXQWULHV RXWVLGH WKH 8QLWHG 6WDWHV %63 FRQVLVWV RI
WZR W\SHV RI WKUHDGV %637 %ULWLVK 6WDQGDUG 3LSH 7DSHU DQG %633 %ULWLVK 6WDQGDUG 3LSH
3
DUDOOHO
%637
WKUHDGV KDYH D VOLJKW WDSHU VLPLODU WR 137 %633 WKUHDGV DUH VWUDLJKW SDUDOOHO WKUHDGV
DQG KDYH WKH VDPH WKUHDG DQJOH VKDSH DQG WKUHDGV SHU LQFK SLWFK DV %637 WKUHDGV
BSPT
and BSPP threads should not be substituted for NPT threads
137
DQG %637 %633 WKUHDGV KDYH GLIIHUHQW DQJOHV VKDSH DQG LQ PRVW FDVHV WKUHDGV
SHU LQFK SLWFK 7KH WKUHDG DQJOH LV ƒ IRU 137 WKUHDGV ƒ IRU %637 %633 WKUHDGV 137
WKUHDGV DUH ÀDWWHQHG DW WKH SHDNV DQG YDOOH\V ZKLOH %637 %633 WKUHDGV DUH URXQGHG
1
RPLQDO
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LSH 6L]H
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KUHDGV SHU LQFK
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