Reference
Thread Data Reference
Thread Data Reference
Approximate Fraction Diameter
Thread Size
Exact Diameter
Applications
0.106 in 0.111 in
#4-36
3/32 in
Socket Knob Threads
0.132 in 0.137 in
Socket Knob Threads & Switchplates
#6-32
1/8 in
Lockup Thread for Lantern Assemblies/ Crossbars & Canopies Lockup Thread (stronger than 6-32 & 8-32) Trophy Products & Drawer Pulls Lamp Harp Posts & Finials
0.158 in 0.163 in
Solid Tube
#8-32
5/32 in
#10-24 (course)
0.184 in 0.189 in
3/16 in
#10-32 (fine)
1/4-20 (course)
0.240 in 0.245 in
1/4 in
1/4-27 (fine)
1/8 IP (1/8-27 N.P.S.M.)
0.380 in 0.390 in
Table Lamps & Lamp Sockets
3/8 in
Floor Lamps & Residential Ceiling Fixtures Floor Lamps & Commercial Ceiling Fixtures
Hollow Tube
1/4 IP (1/4-18 N.P.S.M.)
0.510 in 0.515 in
1/2 in
3/8 IP (3/8-18 N.P.S.M. )
0.648 in 0.658 in
5/8 in
How Thread Size is Notated: #10-32
Please Note: For solid tubes, diameters under 1/4” are given as numbers (e.g. #12) instead of inches, in order of increasing size. For hollow lamp pipes, diameters are notated as IP (Iron Pipe) instead of inches. IP is equivalent to NPSM (National Pipe Straight Mechanical), as noted in chart.
Diameter
Thread Count Threads Per Inch (TPI)
Pg. E20
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