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Shop & field references

Exact answers by size and material

Shop and field reference pages.

Open the thread, material, raceway, or wire size you already know. Every page gives the computed answer first, then the supporting chart and calculator.

Tap drill sizes by thread31 UNC, UNF, NPT, and metric answers from the tap-drill chart.

UNC threads

#4-40 UNC#43 · 0.089 in#6-32 UNC#36 · 0.1065 in#8-32 UNC#29 · 0.136 in#10-24 UNC#25 · 0.1495 in1/4-20 UNC#7 · 0.201 in5/16-18 UNCF · 0.257 in3/8-16 UNC5/16" · 0.3125 in1/2-13 UNC27/64" · 0.4219 in5/8-11 UNC17/32" · 0.5313 in3/4-10 UNC21/32" · 0.6563 in

UNF threads

#10-32 UNF#21 · 0.159 in1/4-28 UNF#3 · 0.213 in5/16-24 UNFI · 0.272 in3/8-24 UNFQ · 0.332 in1/2-20 UNF29/64" · 0.4531 in5/8-18 UNF9/16" · 0.5625 in3/4-16 UNF11/16" · 0.6875 in

NPT threads

1/8-27 NPTR · 0.339 in1/4-18 NPT7/16" · 0.4375 in3/8-18 NPT37/64" · 0.578 in1/2-14 NPT23/32" · 0.719 in3/4-14 NPT59/64" · 0.922 in

Metric threads

M3 × 0.5 Metric2.5 mm · 0.0984 inM4 × 0.7 Metric3.3 mm · 0.1299 inM5 × 0.8 Metric4.2 mm · 0.1654 inM6 × 1.0 Metric5.0 mm · 0.1969 inM8 × 1.25 Metric6.8 mm · 0.2677 inM10 × 1.5 Metric8.5 mm · 0.3346 inM12 × 1.75 Metric10.2 mm · 0.4016 inM16 × 2.0 Metric14.0 mm · 0.5512 inM20 × 2.5 Metric17.5 mm · 0.689 in
Speeds and feeds by material24 material pages with HSS and carbide SFM ranges plus computed RPM tables.

All materials

Aluminum 6061-T6HSS 200–400 · carbide 600–1200 SFMAluminum 7075-T6HSS 200–400 · carbide 600–1500 SFMBrass (free-machining)HSS 150–300 · carbide 500–1000 SFMBronze (manganese)HSS 80–150 · carbide 300–600 SFMCopper (pure)HSS 100–200 · carbide 400–800 SFMCast Iron (gray)HSS 50–90 · carbide 200–400 SFMDuctile IronHSS 50–80 · carbide 180–350 SFMMild Steel (1018)HSS 80–110 · carbide 300–600 SFMAlloy Steel (4140)HSS 60–90 · carbide 250–500 SFMTool Steel (D2)HSS 30–50 · carbide 150–300 SFMTool Steel (H13)HSS 32–55 · carbide 162–329 SFMTool Steel (S7)HSS 32–55 · carbide 162–329 SFMTool Steel (A2)HSS 32–55 · carbide 162–329 SFMTool Steel (M1)HSS 30–50 · carbide 150–300 SFMStainless 304HSS 30–60 · carbide 150–300 SFMStainless 316HSS 30–55 · carbide 140–280 SFMStainless 17-4 PHHSS 25–50 · carbide 120–260 SFMTitanium (Ti-6Al-4V)HSS 20–40 · carbide 100–200 SFMInconel 718HSS 10–25 · carbide 60–150 SFMPlastic (Delrin)HSS 300–800 · carbide 800–2000 SFMMagnesiumHSS 300–800 · carbide 800–2500 SFMNickel (pure)HSS 40–70 · carbide 150–300 SFMLeadHSS 200–400 · carbide 400–800 SFMZincHSS 150–300 · carbide 400–800 SFM
Conduit fill by raceway and size52 raceway-size charts computed from the conduit-fill library.

EMT

1″ EMT25 × 12 AWG THHN2″ EMT100 × 12 AWG THHN3″ EMT266 × 12 AWG THHN4″ EMT443 × 12 AWG THHN1/2″ EMT9 × 12 AWG THHN3/4″ EMT16 × 12 AWG THHN1-1/4″ EMT44 × 12 AWG THHN1-1/2″ EMT61 × 12 AWG THHN2-1/2″ EMT176 × 12 AWG THHN3-1/2″ EMT347 × 12 AWG THHN

PVC Schedule 40

1″ PVC Schedule 4025 × 12 AWG THHN2″ PVC Schedule 4098 × 12 AWG THHN3″ PVC Schedule 40218 × 12 AWG THHN4″ PVC Schedule 40377 × 12 AWG THHN1/2″ PVC Schedule 408 × 12 AWG THHN3/4″ PVC Schedule 4015 × 12 AWG THHN1-1/4″ PVC Schedule 4043 × 12 AWG THHN1-1/2″ PVC Schedule 4059 × 12 AWG THHN2-1/2″ PVC Schedule 40141 × 12 AWG THHN

PVC Schedule 80

1″ PVC Schedule 8020 × 12 AWG THHN2″ PVC Schedule 8086 × 12 AWG THHN3″ PVC Schedule 80193 × 12 AWG THHN4″ PVC Schedule 80338 × 12 AWG THHN1/2″ PVC Schedule 806 × 12 AWG THHN3/4″ PVC Schedule 8012 × 12 AWG THHN1-1/4″ PVC Schedule 8037 × 12 AWG THHN1-1/2″ PVC Schedule 8051 × 12 AWG THHN2-1/2″ PVC Schedule 80123 × 12 AWG THHN

Rigid metal conduit (RMC)

1″ Rigid metal conduit (RMC)26 × 12 AWG THHN2″ Rigid metal conduit (RMC)102 × 12 AWG THHN3″ Rigid metal conduit (RMC)225 × 12 AWG THHN4″ Rigid metal conduit (RMC)387 × 12 AWG THHN1/2″ Rigid metal conduit (RMC)9 × 12 AWG THHN3/4″ Rigid metal conduit (RMC)16 × 12 AWG THHN1-1/4″ Rigid metal conduit (RMC)45 × 12 AWG THHN1-1/2″ Rigid metal conduit (RMC)62 × 12 AWG THHN2-1/2″ Rigid metal conduit (RMC)146 × 12 AWG THHN

Intermediate metal conduit (IMC)

1″ Intermediate metal conduit (IMC)28 × 12 AWG THHN2″ Intermediate metal conduit (IMC)109 × 12 AWG THHN3″ Intermediate metal conduit (IMC)238 × 12 AWG THHN4″ Intermediate metal conduit (IMC)411 × 12 AWG THHN1/2″ Intermediate metal conduit (IMC)10 × 12 AWG THHN3/4″ Intermediate metal conduit (IMC)17 × 12 AWG THHN1-1/4″ Intermediate metal conduit (IMC)49 × 12 AWG THHN1-1/2″ Intermediate metal conduit (IMC)66 × 12 AWG THHN2-1/2″ Intermediate metal conduit (IMC)154 × 12 AWG THHN

ENT flexible nonmetallic

1″ ENT flexible nonmetallic23 × 12 AWG THHN2″ ENT flexible nonmetallic98 × 12 AWG THHN1/2″ ENT flexible nonmetallic8 × 12 AWG THHN3/4″ ENT flexible nonmetallic14 × 12 AWG THHN1-1/4″ ENT flexible nonmetallic43 × 12 AWG THHN1-1/2″ ENT flexible nonmetallic59 × 12 AWG THHN
Conduit fill by wire size36 THHN and XHHW wire-size comparisons across every stored raceway.

THHN / THWN

1 AWG THHN / THWN1 in 3/4″ EMT2 AWG THHN / THWN1 in 3/4″ EMT3 AWG THHN / THWN2 in 3/4″ EMT4 AWG THHN / THWN2 in 3/4″ EMT6 AWG THHN / THWN4 in 3/4″ EMT8 AWG THHN / THWN5 in 3/4″ EMT10 AWG THHN / THWN10 in 3/4″ EMT12 AWG THHN / THWN16 in 3/4″ EMT14 AWG THHN / THWN21 in 3/4″ EMT250 kcmil THHN / THWN0 in 3/4″ EMT300 kcmil THHN / THWN0 in 3/4″ EMT350 kcmil THHN / THWN0 in 3/4″ EMT400 kcmil THHN / THWN0 in 3/4″ EMT500 kcmil THHN / THWN0 in 3/4″ EMT1/0 AWG THHN / THWN1 in 3/4″ EMT2/0 AWG THHN / THWN0 in 3/4″ EMT3/0 AWG THHN / THWN0 in 3/4″ EMT4/0 AWG THHN / THWN0 in 3/4″ EMT

XHHW / XHHW-2

1 AWG XHHW / XHHW-21 in 3/4″ EMT2 AWG XHHW / XHHW-21 in 3/4″ EMT3 AWG XHHW / XHHW-22 in 3/4″ EMT4 AWG XHHW / XHHW-22 in 3/4″ EMT6 AWG XHHW / XHHW-23 in 3/4″ EMT8 AWG XHHW / XHHW-24 in 3/4″ EMT10 AWG XHHW / XHHW-28 in 3/4″ EMT12 AWG XHHW / XHHW-211 in 3/4″ EMT14 AWG XHHW / XHHW-215 in 3/4″ EMT250 kcmil XHHW / XHHW-20 in 3/4″ EMT300 kcmil XHHW / XHHW-20 in 3/4″ EMT350 kcmil XHHW / XHHW-20 in 3/4″ EMT400 kcmil XHHW / XHHW-20 in 3/4″ EMT500 kcmil XHHW / XHHW-20 in 3/4″ EMT1/0 AWG XHHW / XHHW-21 in 3/4″ EMT2/0 AWG XHHW / XHHW-20 in 3/4″ EMT3/0 AWG XHHW / XHHW-20 in 3/4″ EMT4/0 AWG XHHW / XHHW-20 in 3/4″ EMT