Rod Size for Die Threading

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.

HiTorque 7550 Deluxe Bench Lathe - 8.5x20

DRO and digital dials, inch and metric threading
1000 Watt (1.34 HP) brushless DC drive
Reversible lead screw for right and left hand threads
Power longitudinal feed and power cross feed
4" (100 mm) 3-jaw self centering lathe chuck

$3,699.00

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Lathe Chuck, 3-Jaw 4" Premium, Harlingen

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Radial runout maximum of ≤ 0.002" (0.05 mm)
High quality components for enhanced wear-resistance
Includes chuck key, inside and outside jaws

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