Abstract: A detonator 24 for a projectile has a cylindrical housing 32. Housing 32 is provided with an integral base 32. A cylindrical initiator recess 38 is formed in the outer surface 40 of base 26 and an inner stress concentrating recess 42 is formed in the inner surface 44 of base 26. The two recesses 38, 42 define a circular disc 46 of uniform thickness. A bridge wire 56 is formed on a printed circuit board 22. The bridge wire 56 is coated with a temperature sensitive explosive 60. Housing 32 is positioned on board 22 with recess 38 and board 22 defining an initiator chamber 62 in which are located bridge wire 56 and explosive 60. A stab sensitive detonator 64 is positioned in housing 32 with stab sensitive explosive 66 of SSD 64 positioned in close proximity to the inner surface 44 of base 26. A firing signal, a large electrical current, when produced by a fuze 10 heats bridge wire 56 to a temperature at which explosive 60 is ignited.