B22 Bayonet Cap with its familiar “push and twist” action, “bayonet cap” (also known as BC or B22d) is used on most regular light bulbs. It is 22mm diameter and with two locating lugs.
The “small b22 bayonet cap” (SBC or B15d) is very similar but only 15mm across.
There are also many other “BC” variants including the 3-pin BC, B22d-3 Bayonet Cap sometimes used on Fireglow lamps but perhaps more commonly on High pressure mercury lamps for industrial applications. B22 Bayonet Cap Tin-soldering free weld bulb socket for led sockets:
Model Tin-soldering lamp cap
Material Nickel brass,Iron Nickel plated
Feature: Safe, durable,cost-effective
Types: Tin-soldering free weld bulb socket lamp cap copper plated weld wire.