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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.
- Allen Head Screw Dimensions: Understanding The 4-40 Standard
The screw diameter of a 4-40 Allen head screw is 0.112...
- The Ultimate Guide To Understanding Screw Size 40 | ShunTool
The #4-40 screw size indicates a diameter of 2.695 mm to...
- Allen Head Screw Dimensions: Understanding The 4-40 Standard
#4 - 40 UNC : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more
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.
20 wrz 2024 · The #4-40 screw size indicates a diameter of 2.695 mm to 2.824 mm for coarse threads and 2.713 mm to 2.827 mm for fine threads. The "4-40" designation refers to the diameter and the thread count, with 40 threads per inch.
The length is also measured in millimetres and exactly the same as it is for the imperial system. As a handy coincidence, the Gauge (imperial) roughly equals the screw head size in millimetres. A 4 gauge screw will have a head that is approximately 4mm wide.
Metric Screws and Their Approximate Imperial Equivalents. Example how to read the table: M5 x 80 equals approximately to #10 x 2 1/2. Refer to this chart to find the appropriate head size and corresponding wrench for hex bolts, lag bolts & square bolts in inches.
To assist in ordering, we offer metric bolt conversion data for industrial bolts/rods, machine screws, and small-diameter fasteners, including approximate equivalency and common DIN numbers.
