28 Pitch Thread Mills

Solid Carbide Thread Mills

TOSCO Solid Carbide Thread Mills are manufactured with rigid specifications for both dimensional and material integrity. The highest quality micro grain HIP tungsten carbide material is ground to exacting tolerances established by the TOSCO engineers. This results in tools which have maximum strength, long life and unsurpassed repeatability. Solid Carbide Thread Milling Cutters are stocked with TiALN coating. Uncoated tools or other coatings are available upon request. Either full form or stagger tooth designs are available, with options of straight or spiral flute. All TOSCO tools can be easily sharpened between centers by the user or returned to TOSCO for resharpening or refurbishing.

A classification system exists for ease of manufacture and interchangeability of fabricated threaded items. Most (but certainly not all) threaded items are made to a classification standard called the Unified Screw Thread Standard Series. This system is analogous to the fits used with assembled parts.

Classes 1A, 2A, 3A apply to external threads; Classes 1B, 2B, 3B apply to internal threads.

Class 1 threads are loosely fitting threads intended for ease of assembly or use in a dirty environment.

Class 2 threads are the most common. They are designed to maximize strength considering typical machine shop capability and machine practice.

Class 3 threads are used for closer tolerances.

For more information see: http://en.wikipedia.org/wiki/Unified_Thread_Standard

Click Tool Number for volume pricing and online ordering information

We manufacture our thread mills for both Internal & External threads of ALL classes

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STANDARD SPECIFICATIONS

UNJ	MIL S 7742	MIL S 8879
UNJF 3B	UNJ 3A	UNJ 3B
UNF 3B	UN 3B

ROOT RADIUS MODIFICATION

PITCH	UNJ RAD	MIN ROOT RAD ON TOSCO FLAT
28	.0054 .0064	.0039

On OD’S .750 thru 1.00 add $100 EA, for OD 1.500 add $129 EA. If size doesn’t fit the MIN, tool must be specially reground. Please feel free to contact us for more information.