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This battery had two-pin connectors. They were a single ⌀3.2 mm negative pin and a single ⌀4.0 mm positive pin spaced 13.0 mm apart. PP11: 4.5 + 4.5: H: 91.3 L: 65.1 W: 52.4 This battery contained two independent 4.5 V batteries, and had a four-pin connector. 9 V with a center tap was available by wiring in series.
Hex keys of various sizes with ball ends. Tamper-resistant hex screws have a protruding pin in the center of the hex recess that prevents insertion of standard hex keys; as such, they can only be fastened and removed with a special key that has a recess for the pin. A similar "center pin reject" security feature is also used on torx screws.
There are three typical pin sizes: 1.57 mm (0.062 in), 2.13 mm (0.084 in), and 2.36 mm (0.093 in). The 1.57 mm pin can carry 5 A of current, while the 2.36 mm can carry 8.5 A. Because the pins have a large contact surface area and fit tightly, these connectors are typically used for power.
Five-pin male 180° DIN connector from a 1988 Schneider MF2 keyboard by Cherry. The DIN connector is an electrical signal connector that was standardized by the Deutsches Institut für Normung (DIN), the German Institute for Standards, in the mid 1950s, initially with 3 pins for mono, but when stereo connections and gear appeared in late 1950s (1959 or so), versions with 5 pins or more were ...
Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.
Pin type Typical size [Note 1] Typical length Features Beading pins: 14: 7 ⁄ 8 in (22 mm) A wider-than-usual-head allows this pin to hold beads more easily. T-pins: 0.75 mm: 1 + 1 ⁄ 4 in (32 mm) These pins have a head bent into a capital letter "T" to make it easier to grab with the finger tips. Dressmaker pins: 17-20: 1 + 1 ⁄ 16 in (27 mm)