VERMONT 1/4-20 1/4x20 GH3 4 FLUTE HAND TAPER TAP HSS (QTY: 6) USA NOS

Description

Thread Diameter Size (TDZ)
1/4
Threads per Inch (TPI)
20
Overall Length (OAL)
2-5/8"
Thread Cutting Part Length (THL)
1-1/8"
Flute Count (NOF)
4
Flute Helix Angle (FHA)
Cutting Edge Material
HSS
Thread Tolerance Class (TCTR)
GH3
Chamfer
Taper
Coating
Bright
Flute Type
Straight
Style
Taper
Measurement Type
Machine Screw
Series/List #
3105
Thread Size
1/4-20
Thread Direction
Right
Typical Tap Designations:
•
Nominal Size:  This is the description of the thread size that tap will make.
•
Thread Form Symbol:  This describes the thread family.
•
Tap Material:  Usually Carbide or HSS
•
Pitch Diameter Limit:  Tells what tolerance thread will be made.
Pitch Diameter Limits (Threads < 1″ in diameter)
L1
= Basic to Basic minus .0005
H1
= Basic to Basic plus .0005
H2
= Basic plus .0005 to Basic plus .0010
H3
= Basic plus .0010 to Basic plus .0015
H4
= Basic plus .0015 to Basic plus .0020
H5
= Basic plus .0020 to Basic plus .0025
H6
= Basic plus .0025 to Basic plus .0030
Thread Form Symbols / Abbreviations
ACME 60°
STUB 60° Stub thread form
ACME STUB
Stub Acme thread form
ACME-C
Acme thread – centralizing
ACME-G
Acme thread, general purpose
ANPT
Aeronautical National Form taper pipe thread
AWWA
American Water Works Association
BA
British Association Standard thread form
BSF
British Standard Fine thread series
BSPP
British Standard Pipe Parallel
BSPT
British Standard Pipe Taper
BSW
British Standard Whitworth
MM ISO
Metric thread form
N BUTT
American Buttress screw thread
NC
American National Coarse thread series
NEF
American National Extra-Fine thread series
NF
American National Fine thread series
NGO
American National gas outlet threads
NGT
American National gas taper threads
NH
American National hose & fire hose coupling
NM
National Miniature thread series
NPS
American Standard straight pipe thread
NPSC
American Standard straight pipe thread in couplings
NPSF
American Standard internal straight pipe thread (dryseal)
NPSH
American Standard straight pipe thread for hose couplings & nipples
NPSI
American Standard intermediate straight pipe thread (dryseal)
NPSL
American Standard straight pipe thread for locknuts
NPSM
American Standard straight pipe thread for mechanical joints
NPT
American Standard taper pipe thread
NPTF
Dryseal American Standard taper pipe thread
NPTR
American Standard taper pipe thread for rail fittings
NS
Special threads of American National Form
PTF
Dryseal SAE Short Taper pipe thread
SGT
Special Gas Taper thread form
SPL-PTF
Dryseal Short Taper Pipe thread
STI
Special Threads for Helical Coil Wire Screw Thread Inserts
UN
Unified and American thread series
UNC
Unified and American Coarse thread series
UNEF
Unified and American Extra-Fine thread series
UNF
Unified and American Fine thread series
UNIV
Unified Miniature Thread Series
UNJ
Unified Thread Series with Controlled Root Radius
UNJC
Unified Coarse Thread Series with Controlled Root Radius
UNJF
Unified Fine Thread Series with Controlled Root Radius
UNR
Unified Constant Pitch thread series with Controlled Root Radius
UNRC
Unified Coarse Thread Series with Controlled Root Radius
UNRF
Unified Fine Thread Series with Controlled Root Radius
UNS
Unified and American threads of selected special diameters and pitches