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#4 - 40 UNC : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more
- M3
M3 : Basic Thread Dimensions (Pitch, minor & major...
- M3
26 paź 2024 · The screw diameter of a 4-40 Allen head screw is 0.112 inches. This is the thread diameter, while the head diameter is 0.225 inches. The Allen hex drive size is 1/16 inches.
29 wrz 2024 · The 4 in the screw size designation indicates the diameter of the thread, which can range from 2.695 mm to 2.827 mm depending on whether it has coarse or fine teeth. The 40 indicates the number of teeth in a 25.4 mm length.
26 paź 2024 · #4-40 UNC Flat/Countersunk Head Socket Screws. Dimensions and Measurements. The #4-40 UNC flat/countersunk head socket screws have precise dimensions that ensure a secure and flush fit. The thread diameter is #4, and the thread count is 40 threads per inch (TPI), indicating a coarse standard thread.
Screw Size Conversion Chart. In the metric system, both the diameter of screws and the length are measured in millimeters. The first number in the imperial system is the gauge of the screw which refers to the diameter – the larger the number, the larger the diameter.
Metric Screw Thread Chart. Outside Diameter of Screws. Standard Screw Thread Chart. The values listed in the chart above are the recommended values for a class 2 thread fit. The clearance drill sizes listed are the most commonly used sizes.
The Size Dimension pertains to diameter of screws, bolts, & pins and inner diameter of nuts and washers. You may search for your product based on diameter by selecting a measurement on the Size dropdown.