The Bomb Mk I has a forged steel body with a solid nose approximately 1.9 ft. long and a slight taper from the maximum diameter to the tail. The base is threaded externally to take a tail adapter, and internally to take a base adapter, which receives the exploder container. The fuze is locked in position by a fuze securing ring. The Mks II and III are similar to the Mk I, except for the tail adapter, which has four equi-spaced holes threaded for attachment of the tail. The Mk IV is modified to take a Tail Pistol No. 30.
The Tail No. 1 Mk I is of aluminum alloy, consisting of a cylindrical strut attached to the tail cone by four vanes. It fits over the tail adapter and is secured by six screws. The Tail No. 15 Mk I is similar to the No. 1 Mk I, but is made of steel. It has a strengthening ring two inches from the base, and is secured to the tail adapter by four wing bolts. The Tail No. 47 Mk I consists of a cylindrical strut secured to the tail cone by four fins which are riveted on. A reach rod extends through the tail cone, and is supported by a spider.
The bomb is suspended from the plane by two suspension bands.
British Bombs - Designation and Classification
Tail, Impact, No. 37 Mk 1
OP 1665, British Explosive Ordnance (1946)