Professional HSS threading die for cutting Unified National Fine (UNF) external threads in the No. 6-40 size. Manufactured to Maykestag&s WN specification with a 60° unified thread profile, Form B geometry and 2A thread tolerance for accurate, dependable thread production.
The Maykestag Code 5773 HSS die is designed for producing UNF No. 6-40 external threads. The No. 6 designation identifies the nominal unified thread size, while the 40 indicates 40 threads per inch (TPI). UNF threads use a fine pitch compared with the corresponding UNC coarse-thread series, making them suitable where a finer unified thread is specified.
Maykestag specialises in precision cutting tools for professional machining and thread production. With threading tools, accurate geometry is especially important because the cutting edges must generate the required pitch, profile and thread form consistently.
The Code 5773 range combines HSS cutting material with precisely defined UNF geometry and dimensional specifications. This No. 6-40 version is a practical professional choice for workshops, maintenance departments and production environments where a correctly formed fine external thread is required.
The No. 6-40 thread combines a fine 40 TPI pitch with the standard 60° unified thread profile. Using the correct die alignment, suitable cutting conditions and appropriate lubrication for the workpiece material helps the cutting edges form a clean, consistent thread while reducing unnecessary cutting load and tool wear.
The Maykestag Code 5773 range is rated by Maykestag according to its suitability for different material groups. A higher rating indicates greater suitability for the application.
No. 6 is the nominal Unified thread size and 40 indicates that the thread has 40 threads per inch. UNF means Unified National Fine. Fine-pitch threads have more threads over a given length than their corresponding coarse-thread versions and should always be matched with the correct UNF component or specified thread.
The 2A designation identifies the external-thread tolerance class specified for this die. In Unified thread terminology, the letter A denotes an external thread, while Class 2 represents the commonly specified general-purpose fit. The mating internal thread must be selected according to the requirements of the application.
UNF threads use a symmetrical 60° thread angle. The die&s cutting geometry forms this profile together with the specified pitch so that the resulting external thread conforms to the required Unified fine-thread form.
MaySpeedGuide: Maykestag recommends using the MaySpeedGuide to determine the appropriate cutting conditions for the tool, workpiece material and machining application.
| Description | Spec |
|---|---|
| Brand: | Maykestag |
| Product Description: | HSS UNF Round Die No. 6-40 |
| Cat No.: | MAY57730060 |
| Manufacturer Code: | 0577300600100 |
| Series Code: | 5773 |
| Standard: | WN |
| Thread Standard: | UNF ANSI B 1.1 |
| Thread Type: | UNF - Unified National Fine |
| Thread Size (d1): | No. 6 |
| Threads per Inch (P): | 40 TPI |
| Thread Profile Angle: | 60° |
| Tolerance: | 2A |
| Form: | B |
| Tool Material: | HSS - High Speed Steel |
| Outside Diameter (d2): | 20 mm |
| Thickness (h): | 5 mm |
