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The length of a machine screw or bolt is indicated by an × and the length expressed in millimetres (e.g. M8-1.25×30 or M8×30). [ citation needed ] Tolerance classes defined in ISO 965-1 can be appended to these designations, if required (e.g. M500– 6g in external threads).
M2 1: 3: 1.981: 1.886: 1.721: 1.654 ... 965-5 Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of ...
Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.
Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20 mm size screws. [84] Its primary advantage is its ability to resist cam-out , so it is used in high-torque applications, such as tamper-proof lug nuts , cylinder head bolts, and other engine bolts.
A regular computer case may require/include [5] 7 thumb screw 6-32 × 6 mm for 2.5” drive tray, expansion slots; 4 hexagon screw 6-32 × 6 mm for psu; 21 phillips screw 6-32 × 5 mm for motherboard, 3.5” harddisk tray; 12 phillips screw M3 × 5 mm for 2.5” harddrive; 16 KB5 x 10 mm for fans; 9 standoff 6-32 × 6.5 + 4 mm for motherboard
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