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Detonator Cap No. 8-A

Detonator Cap No. 8-A is a Soviet flash-type detonator cap, consisting of a cylindrical casing open at one end, with a high explosive charge (tetryl, PETN, or RDX) pressed into the lower part, and a primary explosive (lead azide and TNRS) above it. The detonator cap charge is covered on top by a cup with a hole in the center. The hole in the cup is covered with a silk mesh.

It is used for manufacturing firing tubes when conducting blasting operations by the flame method, as well as in the designs of certain engineer munitions.

Detonator Cap No. 8-A must be handled with extreme care; it is sensitive to impact, compression, and heating. It must be transported only in a protective tube or case. If it detonates in the hands, it can tear off several fingers.

KD 8-A
KD 8-A
KD 8-A

Technical and Tactical Characteristics of KD 8-A

Method of initiation
Flash
Casing material
Aluminum
Filling composition
TNRS, lead azide, tetryl, PETN, or RDX
Mass of TNRS
0.1 g
Mass of lead azide
0.2 g
Mass of explosive (tetryl, PETN, or RDX)
1.02 g
Casing diameter (external)
6.8-7.05 mm
Casing diameter (internal)
6.3-6.5 mm
Casing length
45.5-48.5 mm
Detonator caps: a — No. 8-A; b — No. 8-M; c — training; 1 — casing; 2 — cup; 3 — TNRS; 4 — lead azide; 5 — tetryl (PETN or RDX); 6 — mesh; 7 — mercury fulminate; 8 — inert substance; 9 — cardboard disk; 10 — white stripe (band).
Detonator caps: a — No. 8-A; b — No. 8-M; c — training; 1 — casing; 2 — cup; 3 — TNRS; 4 — lead azide; 5 — tetryl (PETN or RDX); 6 — mesh; 7 — mercury fulminate; 8 — inert substance; 9 — cardboard disk; 10 — white stripe (band).
Detonator caps: a — No. 8-A; b — No. 8-M; c — training; 1 — casing; 2 — cup; 3 — TNRS; 4 — lead azide; 5 — tetryl (PETN or RDX); 6 — mesh; 7 — mercury fulminate; 8 — inert substance; 9 — cardboard disk; 10 — white stripe (band).
Explosion of KD 8-A, freeze frame from the video below
Explosion of KD 8-A, freeze frame from the video below
Explosion of KD 8-A, freeze frame from the video below
The author of the video shows how dangerous KD 8-A is
Video by Lisnyk on rules for handling and storing detonators

Training Detonator Caps No. 8-A are used for troop training. They have the same dimensions as live ones, but are filled with an inert substance. There is a white stripe (band) 3–5 mm wide on the casing, and a hole in the base of the casing, closed with a cardboard disk.

Training Detonator Cap No. 8-A in the middle
Training Detonator Cap No. 8-A in the middle
Training Detonator Cap No. 8-A in the middle