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Rod Size for Die Threading

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Thread Specification: 

Examples:

#10-32
10-32
In Numbered machine screw thread (#1 through #12)
1/4-20
1/4"-20
0.25-20
In Fractional UNC thread (1/4" through 1")
1/2-20
1/2"-20
0.5-20
In Fractional UNF thread (1/4" through 1")
M6
M6x1
6x1
mm Metric coarse thread (M1 through M22)
M6x0.75
M6x.75
6x.75
6mm x.75
mm Metric fine thread (M1 through M22)
0.255-40
.255-40
0.255"-40
In Non-standard thread (0.06" through 1.0")

 

Reducing the size of a rod you want to thread with a die makes it easier to start the die,
but the real secret is to add a 30° chamfer to the end of the rod.

Die Blank Size is the Major Diameter less 10% of the Pitch.
This is about the same as common bolts.

 
SPECIAL OF THE WEEK
Keyless Drill Chuck, 5/8" $39.95

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Keyless Drill Chuck, 5/8"
Tool Ejecting Draw Bar, Mini Mill
  • Tool Ejecting Draw Bar
  • Designed for SIEG mini mills
  • Designed to make draw bar / tool changes quicker and easier
  • No need to hit top of drawbar with mallet

$134.95

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Turret Tool Holder, 2MT Tailstock, 3 Heads
  • Three head turret tool holder
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  • Equipped with 3MT arbor sleeve
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  • Quick locking lever for rapid tool changing

$139.95

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SIEG C2 7x14 Mini Lathe
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  • Includes 3" 3-jaw chuck, 2 sets of jaws, and chuck key
  • Variable speed with two speed ranges for low speed torque
  • Threading Dial
  • 2MT dead center, change gear set, 1/2" drill chuck

$799.00

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