When used for internal threading, thread mills can create threads of any size equal to or greater than the minimum size listed. They leave space in the hole for chips to fall, and a broken thread mill can fall into the hole without damaging the workpiece.
Thread mills for internal threading cut threads more quickly than other thread mills, but the threads they create have a fixed pitch.
Thread mills for external threading cut with single point, producing rounded threads that are commonly used for high-stress fastening applications involving heavy loads and high pressures. Each cuts a single thread pitch.
Thread mills for internal/external threading have a single cutting point that cuts threads in a range of different pitches on both the inside and outside of the workpiece.
For Min.
Thread Size Thread
Pitch, mm Threads
Per Inch Thread
Lg. Overall
Lg. No. of
Flutes Thread Type Shank
Size Each
Aluminum-Titanium-Nitride (AlTiN) Coated Carbide
No. 4 __ 40 3/16" 2 1/2" 2 UNC, UNEF, UNF, UNJ, UNS 1/4" 5277N11 $107.86
No. 6 __ 32 17/64" 2 1/2" 3 UNC, UNEF, UNF, UNJ, UNS 1/4" 5277N12 107.86
No. 8 __ 32 17/64" 2 1/2" 3 UNC, UNEF, UNF, UNJ, UNS 1/4" 5277N13 110.65
No. 10 __ 32 21/64" 2 1/2" 3 UNC, UNEF, UNF, UNJ, UNS 1/4" 5277N15 110.65
No. 10 __ 24 11/32" 2 1/2" 3 UNC, UNEF, UNF, UNJ, UNS 1/4" 5277N14 110.65
1/4" __ 20 33/64" 2 1/2" 3 UNC, UNEF, UNF, UNJ, UNS 1/4" 5277N16 119.95
5/16" __ 18 5/8" 2 1/2" 3 UNC, UNEF, UNF, UNJ, UNS 1/4" 5277N17 129.25
3/8" __ 16 25/32" 3" 4 UNC, UNEF, UNF, UNJ, UNS 5/16" 5277N18 152.50
1/2" __ 13 7/8" 3" 4 UNC, UNEF, UNF, UNJ, UNS 3/8" 5277N19 157.15
M5 0.8 __ 21/64" 2 9/32" 3 Metric 0.2362" 5277N21 107.86
M6 1 __ 31/64" 2 9/32" 3 Metric 0.2362" 5277N22 119.95
M8 1.25 __ 21/32" 2 9/32" 3 Metric 0.2362" 5277N23 138.55
For External Threading
Threads
Per Inch Overall
Lg. Thread
Type Shank
Size Neck
Dia. Each
Aluminum-Titanium-Nitride (AlTiN) Coated Carbide
32 3" UNJ 3/8" 0.24" 6210N11 $97.45
28 3" UNJ 3/8" 0.24" 6210N12 97.45
24 3" UNJ 3/8" 0.24" 6210N13 97.45
20 3" UNJ 3/8" 0.24" 6210N14 97.45
18 3" UNJ 3/8" 0.24" 6210N15 97.45
16 3" UNJ 3/8" 0.24" 6210N16 97.45
12 3 1/2" UNJ 1/2" 0.34" 6210N17 135.34
For Internal/External Threading
External Threading
Internal Threading
For Min.
Thread Size Threads
Per Inch Overall
Lg. Thread Type (For Thread Location) Shank
Size Neck
Dia. Each
Aluminum-Titanium-Nitride (AlTiN) Coated Carbide
No. 2 56-80 1 1/2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 1/8" 0.034" 4425N11 $50.22
No. 4 40-64 2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 3/16" 0.045" 4425N12 50.22
No. 6 32-64 2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 3/16" 0.049" 4425N13 50.22
No. 8 32-56 2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 3/16" 0.07" 4425N14 50.22
No. 10 24-56 2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 3/16" 0.075" 4425N15 50.22
No. 12 24-56 2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 3/16" 0.08" 4425N16 50.22
1/4" 18-56 2 1/2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 1/4" 0.104" 4425N17 55.36
5/16" 16-48 2 1/2" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 1/4" 0.153" 4425N18 55.36
3/8" 14-40 3" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 3/8" 0.192" 4425N19 64.58
1/2" 12-32 3" UNC, UNEF, UNF, UNS (Internal/External), UNJ (Internal) 3/8" 0.24" 4425N21 64.58
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