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ùaXõd^ Be¡s (Helix angle)
JÚ UûW«u N¬Ü ARu LtTû]Vô]
ùNeÏjÕd úLôhúPôÓ HtTÓjÕm úLôQm
ùaXõdv Be¡s G]lTÓm.
UûW«u Ñ¯ (Hand)
vÏÚ Øuú]±f ùNpYRtÏ Sôm
ETúVôLlTÓjÕm ÑZt£«u YûL Ñ¯ (A)
úaih G]lTÓm. YXm Ñ¯ UûW«û]
¡[ôd ûY^ôL Ñtßm úTôÕ UûW
Øuú]ßm. Uô\ôL JÚ CPm Ñ¯ UûW«û]
Bu¥ ¡[ôd ûY^ôL Ñtßm úTôÕ UûW
Øuú]ôd¡ ùNpÛm. (Fig 3)

vÏÚ UûWLs þ 'V' UûW«u YûLLÞm Utßm TVuLÞm (Screw threads
- types of 'V' threads and their uses)

úSôdLeLs: ClTôPj§u Ø¥®p ¿eLs ùT\ úYi¥V A±Ü §\uLs
• 'V' UûW«u YûWVßdLlThP ùYqúYß YûLLs Tt±d á\p
• UûW«u úLôQm, ©hf Utßm AÕ ùRôPoTô] TX TôLeLs Tt± á\p
• TX YûLVô] YûWVßdLlThP 'V' UûWL°u ETúVôLeLs Tt±d á\p.

UûWL°u ùYqúYß YûLLs:
BSW UûW ©¬h¥x vPôiPoh (Standard)
®h ùYôoj UûW (British Standard whit worth
thread)
BSF ûTu UûW : ©¬h¥x vPôiPoh
ÖiUûWLs (British Standard fine thread)
BSP ûTl UûW (British Standard pipe thread)
©¬h¥x vPôiPoh ÏZôn UûW

B.A UûW þ ©¬h¥x AúNô£úVNu UûW
YûWTPj§p ARu ùT¬V ®hPjûR
(British Association thread)
ùLôÓlTRu êXm Ï±dLlTh¥ÚdÏm.
I.S.O ùUh¬d UûW þ CVk§W RW ¨oQV ERôWQm 1/2” BSW, 1/4” BSW Ï±l©hP
¨ßY]j§u ùUh¬d UûW (International standard ®hPeLÞdÏ YûWVßdLl ThP JÚ
organisation metric thread) AeÏXj§p Es[ UûWL°u Gi¦dûL
(TPI) AhPYûQ«p ùLôÓdLlThÓ Es[Õ.
A.N.S UûW ®tTû]Vô[o UûW (American
national or seller's thread) BSF UûW
BIS ùUh¬d UûW þ Ck§V RW ¨oQV CÕ BSW UûWûVl úTôXúY CÚdÏm.
¨ßY]j§u ùUh¬d UûW (Bureau of Indian B]ôp Ï±l©hP ®hPj§p JÚ
Standard metric thread) AeÏXj§tLô] UûWL°u Gi¦dûL (TPI)

BSW UûW (Fig 1) UhÓm UôßTÓm. BSW UûW«p JÚ
Ï±l©hP ®hPj§p JÚ AeÏXj§p
CRu úLôQm 55° BÏm. CkR UûW«u
LôQlTÓm UûWûV Lôh¥Ûm BSF UûW«p
ùPlj 0.6403 x P BÏm. CRu ¡Wvh Utßm
JÚ AeÏXj§tÏ áÓRXô] UûWLs
ìh Ï±l©hP BWj§tÏ WÜih Bl
ùYhPlTh¥ÚdÏm. ERôWQm 1"BSW 8TPI,
ùNnVlTh¥ÚdÏm. TPm UûW«u ©hf
1"BSF 10TPI. TpúYß ®hPeLÞdLô]
Utßm ©\ TôLeLÞdÏ EiPô]
YûWVßdLlThPTPIþLs AhPYûQ«p
ùRôPoûT ®Y¬d¡\Õ BSW UûWL[ô]Õ
ùLôÓdLlThÓs[]. CkR UûWLs
276 £_õ & Gm: @©hPo (NSQF - Revised 2022) ------ R.T. for Ex. No.1.5.68-69

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