| Uses | | | | GU10 |
| This style of connector was named after its original | | | | IEC 60061-1 (7004-121) |
| use for soldiers who need to mount bayonets to the | | | | GZ10 |
| ends of their rifles in a hurry. The same need also | | | | IEC 60061-1 (7004-120) |
| applies to photographers who may need to change | | | | GU24 |
| lenses quickly. | | | | Pending (Mar 2007) |
| Several classes of electrical cable connectors, including | | | | While G actually indicates bi-pin, those listed above |
| audio, video, and data cables use bayonet | | | | have a twist-lock, but with parallel pins from the end |
| connectors. Examples include BNC, C, and ST | | | | instead of opposing pins on the side. |
| connectors. | | | | These are the available sizes in the UK: |
| Home light bulbs (230/240 V mains voltage) in India, | | | | Designation |
| Australia, Ireland, New Zealand, the UK, Middle East | | | | Alternative designation |
| and, in older installations, France, also have this type | | | | Contacts |
| of "B" base, as well as the Edison screw (E) base | | | | Dimension, etc. |
| used in the United States, Japan and other countries. | | | | BA5s |
| These bulbs have two pins on opposite sides of the | | | | 1 |
| cap; however, some specialized bulbs have three pins | | | | 5 mm |
| (cap designation B22d-3) to prevent use in domestic | | | | BA7s |
| light fittings. Examples of three pin bulbs are found in | | | | 1 |
| mercury street lamps and fireglow bulbs in some | | | | 7 mm |
| older models of electric fire. Bayonet cap bulbs are | | | | BAX9s |
| very common worldwide in applications where | | | | 1 |
| vibration may loosen conventional bulbs, such as | | | | 9 mm |
| automotive lighting and other small indicators, and in | | | | BA9s |
| many flashlights. | | | | Miniature bayonet cap (MBC) |
| Some bulbs may have slightly offset lugs to ensure | | | | 1 |
| they can be only inserted in one direction; this is | | | | 9 mm |
| particularly true in bulbs like the 1157 automobile | | | | BA15d |
| tail-light which has two different filaments to act as | | | | Small bayonet cap (SBC) |
| both a running light and a signal light. In the 1157 | | | | 2 |
| automotive bulb, each filament has a different | | | | 15 mm |
| brightness and is connected to a separate contact on | | | | BAX15s |
| the bottom of the base, the two contacts being | | | | 1 |
| symmetrically positioned about the axis of the base | | | | 15 mm |
| (unlike a 3-way medium screw base in which the two | | | | BA15s |
| filament contacts are a center circle and a ring,) so | | | | Single centre contact (SCC) |
| proper orientation of the bulb is necessary to | | | | 1 |
| connect each filament to the correct separate circuit. | | | | 15 mm |
| Newer bulbs use a wedge base which does not have | | | | BA20s |
| this issue. | | | | 1 |
| Bayonet bases or caps are often abbreviated to BC, | | | | 20 mm |
| often with a number after. The number refers to the | | | | BA20d |
| diameter of the base (e.g., BC22 is a 22 mm | | | | 2 |
| diameter bayonet cap lamp). BC15, a 15 mm base, | | | | 20 mm |
| can also be referred to as SBC standing for small | | | | BA21d |
| bayonet cap. The lowercase letter s or d refers to | | | | 2 |
| whether there are one (single) or two (double) | | | | 21 mm |
| contacts on the bottom of the bulb. | | | | B21-4 |
| Bulb bayonet mounts | | | | 21 mm 4 pin |
| Compact fluorescent lamp with double contact B22d | | | | BA22d |
| bayonet mount | | | | Bayonet cap (BC) |
| Incandescent light bulb with double contact B22d | | | | 2 |
| bayonet mount, and corresponding socket with | | | | 22 mm |
| sprung connectors | | | | BC-3 |
| Preceding bulb mounted in the socket | | | | Bayonet cap (BC) |
| LED lamps with GU10 bi-pin twist-lock mount | | | | 2 |
| Incandescent 40 W BA15d bulb | | | | 22 mm 3 bayonet pins |
| See also: Automotive lamp types | | | | B22d-3 |
| Type | | | | 2 |
| IEC | | | | 22 mm double ended (railway) |
| DIN | | | | BX22d |
| ANSI | | | | 2 |
| B15d | | | | 22 mm |
| IEC 60061-1 (7004-11) | | | | Of these, only the BC (BA22d) is widely used in |
| DIN 49721 | | | | homes. |
| BA15d | | | | References |
| IEC 7004-11 A | | | | ^ see |
| DIN 49720 | | | | IEC 61184: Bayonet lampholders, International |
| BA15s | | | | Electrotechnical Commission, 1997. (also: BS EN 61184) |
| IEC 7004-11 A | | | | specifies requirements and tests for the B15 and B22 |
| DIN 49720 | | | | bayonet holders for light bulbs used in some |
| BA20d | | | | Commonwealth countries |
| IEC 7004-12 | | | | See also |
| DIN 49730 | | | | Bipin |
| B21s-4 | | | | Arri bayonet |
| B22d | | | | Lens mount |
| IEC 60061-1 (7004-10) | | | | Joseph Swan |
| BY22d | | | | Bayonet - a type of knife that attaches to a rifle. |
| B24s-3 | | | | |