Data Quality84%
MASS(Military Archive Scoring System)
ⓘ Regardless of era, the same scoring system applies to all units in the nuclear warheads category.
01 / Overview
Mark 21 nuclear bomb
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
NUCLEAR WARHEADS · EARLY COLD WAR
5
PERFORMANCE/PRICE
60
UNIT COST (2025 USD)
—
ⓘ Performance/Price and MASS score are computed across all units in the nuclear warheads category, regardless of era.
02 / Specs & Design
◎General6MOD.6
- Warhead Typethermonuclear
- Service Entry Year1955
- Weight8,000 kg
- Length3.658 m
- Diameter1,480 mm
- In ServiceYes
◈Yield6MOD.6
- Yield18,000
- Yield Range18 to 19 megatons
- ThermonuclearYes
- Boosted FissionNo
- Variable Yield (Dial-a-Yield)No
- Enhanced Radiation (Neutron)No
▣Delivery5MOD.5
- Delivery SystemsB-36, B-47
- MIRV-CompatibleNo
- Missile WarheadNo
- Gravity BombYes
- Artillery ShellNo
◇Safety & Security3MOD.3
◆Production4MOD.4
- Number Built275
- Designer / Labunknown
- First Test1954
- Operators1
03 / History
SERVICE LIFESPANRetired
- 1955Production started
- 1956Production ended
71
years in service
1
years in production
275
units produced
0
countries operating
ⓘ 1 countries retired it.
05 / MASS Score
NUCLEAR WARHEADS RANKING Nuclear Warheads · Early Cold War
MASS RANKINGSMASS ↗
26NUCLEAR WARHEADS5EARLY COLD WAR · NUCLEAR WARHEADS740UNITED STATES · ALL WEAPONS32PERFORMANCE/PRICE · NUCLEAR WARHEADS
ⓘ Rankings are within theNuclear Warheadscategory.
📖 TERMS ON THIS PAGE2terms
A gravity bomb is a type of bomb that relies on gravity to guide it to its target, using no thrust or lift during its descent.
Relating to nuclear weapons that derive destructive power from both fission and fusion reactions, typically used in intercontinental ballistic missiles.
These terms are listed automatically because they appear on this page.full encyclopedia →
📚 Sources