Product Description
Milwaukee 4-40 NC 1 in. Hex Threading Die
Model Number: 49-57-5308
The Milwaukee 49-57-5308 is a 4-40 NC 1 in. Hex Threading Die, used to cut or restore external threads on a rod, screw stock, or bolt. A die is the external-thread counterpart to a tap: where a tap cuts threads inside a hole, this die cuts a 4-40 thread onto the outside of round stock, allowing you to make a threaded fastener, repair damaged threads, or clean up a corroded or deformed thread so a nut or fitting turns on freely. The 4-40 designation is the thread it cuts: a #4 screw size with 40 threads per inch in the National Coarse (NC) series, one of the smallest common machine-screw thread sizes. It is a hex die with a 1 in. hex body, which fits the Milwaukee Hex-LOK 2-in-1 Handle as well as any standard 1 in. hex die stock, so it can be driven with the threading handle you already run.
The die features long-lasting laser-etched sizing for the clearest markings, so the size stays readable throughout the life of the die, and it is made to Milwaukee's professional threading standard for clean, accurate threads. For best results, use the die with cutting fluid: lubricating while threading produces cleaner threads, extends die life, and makes the cut easier, especially on steel. This is an individual die, sold separately, so you can add the exact 4-40 size to your threading kit or replace a worn or missing one without buying a whole set.
This hex threading die is a practical addition for mechanics, electricians, fabricators, and maintenance technicians who work with small 4-40 threaded fasteners and need to cut or repair external threads. It pairs with the matching 4-40 tap for complete internal and external threading of that size, and with the Milwaukee Hex-LOK handle for tool-free die changes. Milwaukee hand tools are backed by a lifetime guarantee. For anyone building out a set of individual Milwaukee hex dies or needing to replace just the 4-40, it is the correct genuine part.
Features
- Genuine Milwaukee 4-40 NC 1 in. Hex Threading Die
- Cuts and restores external 4-40 threads on rod, screw stock, or bolts
- 4-40: #4 screw size, 40 threads per inch, National Coarse
- One of the smallest common machine-screw thread sizes
- 1 in. hex body fits the Hex-LOK 2-in-1 Handle and standard 1 in. hex die stock
- Long-lasting laser-etched sizing for the clearest markings
- Made to Milwaukee's professional threading standard
- For best results, use with cutting fluid
- Sold individually to add or replace the exact 4-40 size
- Pairs with the matching 4-40 tap for internal and external threading
- Backed by the Milwaukee lifetime guarantee on hand tools
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 49-57-5308
- Type: Hex Threading Die
- Thread Size: 4-40
- Thread Series: NC (National Coarse)
- Threads Per Inch: 40
- Die Body: 1 in. hex
- Compatibility: Hex-LOK 2-in-1 Handle and standard 1 in. hex die stock
- Markings: Laser-etched sizing
- Recommended Use: With cutting fluid
- Quantity: Sold individually
- Part Type: Genuine Milwaukee Hand Tool
Includes
- (1) Milwaukee 49-57-5308 4-40 NC 1 in. Hex Threading Die
