Thread MillMade in USA

THR-1/2

Name: RobbJack THR-1/2 — Thread Mill made from Solid Carbide for Inch and Metric Threads
Brand: RobbJack
SKU: THR-1/2
Price: 178.90 USD
Availability: MadeToOrder

Thread Mill made from Solid Carbide for Inch and Metric Threads

Thread Mill 1/2, 0.420 Dia, 6 Flute, 0.800 Neck Len, 0.500 Shank, 2.5 OAL

Scaled drawing — true to this tool's dimensions (inch)

Speeds & FeedsDialed to this exact tool — free

Free CAD & DataSTEP 3D DXF 2D ISO CSV CAM library

One solid carbide thread mill makes coarse, fine or custom threads — internal or external

Single-profile design cuts common or custom thread pitches with the same standard tool
Cuts internal or external 60-degree threads; produces superior threads versus tapping
Eleven sizes from #3 (2 mm) to 3/4-in (24 mm): cut diameters .072 to .625-in with 1 to 6 flutes
Crest widths ground from .001 to .004-in depending on size
Standard shanks 3/16 to 3/4-in, overall lengths 2 to 4-in; necks ground longer on request
Suggested starting parameters: ferrous 150–300 SFM at .0002–.001 IPT; non-ferrous 500–1,000 SFM at .0005–.0015 IPT; interpolate the helix from the bottom up
Available uncoated, AlTiN coated (-A) and DLC coated (-DLC)
Pair with the RTHR series relief mill when the bottom of a blind threaded hole needs a relief

From the RobbJack Applications Guide.

About this series

THR Solid Carbide Thread Mills

Superior threads versus tapping, coarse, fine or custom

RobbJack's THR solid carbide thread mills are used to produce precision threads at common thread pitches, or custom thread pitches if needed, with the same standard tool. They produce superior threads versus tapping operations and can be used to cut internal or external 60-degree threads. A single THR tool will make coarse, fine or custom threads. When relief is needed at the bottom of an internal threaded hole, use the matching RTHR series relief mill.

Produces superior threads versus tapping
Cuts internal or external 60-degree threads
One standard tool makes coarse, fine or custom threads
Available uncoated, AlTiN coated (-A) and DLC coated (-DLC)
1, 2, 3, 4 or 6 flute depending on size
Necks ground longer on request

Inch and metric threads from #3/2 mm to 3/4"/24 mm. Pair with RTHR relief mills for relief at the bottom of internal threaded holes.

Headline spec

Covers thread sizes #3 (2 mm) through 3/4" (24 mm), inch and metric, on a single tool fami

Best for

Producing precision internal or external 60-degree threads
Replacing tapping for superior thread quality
Coarse, fine and custom thread pitches with one tool

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC: 0.42″
Shank DiameterDMM: 0.5″
Neck DiameterND: 0.3″
Neck LengthLN: 0.8″
Thread Form Angle: 60° included
Thread Crest: 0.004″
Overall Length (OAL)OAL: 2.5″
Number of FlutesNOF: 6
Blend Angle (neck→shank): 45°
Entry: Requires a pre-drilled hole
Thread Sizes: 1/2" / 16mm
Cuts Threads: Internal & external (60° form)
Series: THR — Thread Mill made from Solid Carbide for Inch and Metric Threads