# Right-angle subminiature pushbutton A right-angle through-hole subminiature pushbutton, NKK's Series BB BB15AH: single pole, SPDT, momentary, with right-angle PC terminals and a support bracket. It has a black housing, a round bushing with a white plunger, a metal bracket with two legs, three wire terminals, and an optional slip-on cap. The origin is terminal 2 (COM), on the board's top face (the XY plane). Terminals 1, 2 and 3 lie along X, 2.54 apart. The plunger points along -Y, and its axis is 3.4 above the board. `cap` is the slip-on cap: none (BB15AH), F (AT475, 5.1 dia.) or H (AT496, 7.5 dia.). `cap_color` is its colour, the part number's last letter: A black, B white, C red (for example BB15AH-FA). - The body is 8.8 wide and 7.3 high. - The bushing is 6.0 dia. and 2.7 long. The plunger is 2.8 dia. and comes 5.4 out of the bushing's nose. - The terminals are 0.6 dia., 2.54 apart, and 13.9 behind the bushing's nose. They reach 3.1 below the board. - The bracket is 0.5 thick. Its two legs are 0.6 wide and 0.4 thick, 5.08 in front of the terminals and 5.08 apart, under terminals 1 and 3. - A cap's face is 6.3 in front of the bushing's nose, and the cap is 4.0 long. The 7.5 cap reaches 0.35 below the board's face, so a switch with it sits at the board's edge. ## Source NKK Switches, *Series BB, Process Sealed Subminiature Antistatic Pushbuttons*, catalogue pages C12 to C17 (PDF of 2016-10-25), from NKK's own site, . Dimensions are in inches (mm); the mm values are used here. - Page C17, Typical Switch Dimensions, Single Pole, Right Angle PC (drawn as BB15AH-FA): body (8.8) .346 wide and (7.3) .287 high; bushing (6.0) dia. .236 and (2.7) .106 long; plunger (2.8) dia. .110, (5.4) .213 out of the bushing; (13.9) .546 from the bushing's nose to the terminals; plunger axis (3.4) .134 above the board; terminals (2.54) .100 apart, (0.6) dia. .024, (3.1) .122 below the board; bracket legs (5.08) .200 in front of the terminals and (5.08) .200 apart, (0.4) .016 thick; cap (5.1) dia. .201 and (4.0) .157 long, its face (6.3) .248 from the bushing's nose. - Page C15, PC Terminals, H Right Angle with Bracket: terminals (0.6) dia. .024; bracket legs (0.6) .024 wide and (0.4) .016 thick; bracket (0.5) .020 thick. Slip-On Caps: F AT475, (5.1) dia. .201; H AT496, (7.5) dia. .295; both (6.3) .248 from the bushing and (4.0) .157 long, polyamide, black, white or red. - Page C14, Typical Switch Ordering Example: BB15AH-FA is SPDT, ON-(ON) circuit, a .213" (5.4mm) long white plunger (A), right angle PC terminals with bracket (H), and a black .201" (5.1mm) diameter cap (F, A); caps F .201" (5.1mm) or H .295" (7.5mm) diameter. - Page C13, Materials & Finishes: plunger polyacetal; bushing carbon blended polyamide; case housing glass fiber reinforced polyamide; support bracket tin plated phosphor bronze; terminals copper alloy with gold plating. Page C15: standard plunger colour white. The sheet gives no weight. **Proportions, for looks only.** The sheet doesn't dimension the following. They are scaled from page C17's side and rear views: - The housing, 8.0 wide; the bracket's front plate is the 8.8 width. - The housing's front part, 6.6 high, from the bracket's front plate to 6.0 in front of the terminals, standing on the bracket's bottom plate. Behind it, the rear block is the full 7.3 high and reaches the board behind the legs. - The rear face, 0.8 in front of the terminals. The terminals leave it 2.5 above the board, run back to their row and bend down. - The bracket is drawn as a front plate round the bushing and a bottom plate to the legs. The legs are straight, without the drawing's snap-in kink. Materials follow page C13: the housing and bushing polyamide (`pa6`, black), the plunger polyacetal (`pom-copolymer`, white), the bracket phosphor bronze (`copper-c51000`, tin coloured), the terminals copper alloy (`copper`, gold coloured), and the caps polyamide (`pa6`) in their colour. **Mass check:** the sheet states no weight. As modelled, BB15AH is 0.60 g housing + 0.10 g bushing + 0.37 g bracket + 0.05 g plunger + 0.05 g terminals = 1.17 g. ## Catalogue models The old `SW NKK BB15AH` model names this part, so it maps to BB15AH. It was measured on the reference model (2026-11-06). It carries a 5.1 mm cap, which BB15AH has no letter for (that is BB15AH-F_), and its body is a plain block. The width, height, terminals and legs agree with the sheet. | | Old model | NKK sheet | |---|---|---| | Body | a block 8.8 wide, 7.3 high, 12.7 long, out to 13.9 in front of the terminals | 8.8 wide, 7.3 high; a 6.0 dia. bushing 2.7 long in front, its nose 13.9 in front of the terminals | | Plunger axis | 3.65 above the board | 3.4 | | Cap | 5.1 dia., 4.0 long, its face 20.2 in front of the terminals | none on BB15AH; F cap 5.1 dia., 4.0 long, its face 6.3 + 13.9 = 20.2 in front | | Terminals | 0.6 square, 2.54 apart, 3.1 below the board | 0.6 dia., 2.54 apart, 3.1 below | | Bracket legs | 0.6 x 0.4, 5.08 in front of the terminals, under terminals 1 and 3 | the same | The family's other switches (DIP switches, slide switches, tactile switches) are other parts. See `COVERAGE.md`.