MK-84 2000 lb Bomb Casing

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The MK-84 2000 lb Bomb Casing is a high-strength, low-drag steel shell engineered from forged and heat-treated 40Ni6Cr4Mo3 alloy to house nearly 945 lb of high explosive. Precision-machined slots and tapped holes allow easy integration with fins, guidance kits, or handling fixtures, while its streamlined profile ensures stable ballistic performance. Rigorous metallurgical standards: yield strength ≥ 880 MPa, tensile strength 1,100–1,250 MPa, and Vickers hardness 352–375 HV are achieved through controlled forging, flow-forming, and quench-and-temper heat treatment. Every casing undergoes comprehensive NDT (ultrasonic, magnetic particle, and, where needed, radiography) and dimensional inspection with traceable NABL-certified materials to guarantee reliability. Compatible with unguided, laser-guided, GPS/INS-guided, and specialized munitions applications, this casing delivers consistent, field-proven performance across a broad spectrum of aerial ordnance roles.
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Technical Details

Characteristic Value
Overall Length 2,480 mm
Maximum Diameter 457.10 mm
Nominal Weight 2,000 lb (907.2 kg); actual 1,972–2,028 lb
Explosive Filling 945 lb Tritonal or PBXN-109
Penetration Capability Up to 11 ft of reinforced concrete
Slots & Tapped Holes 6 × 7 mm slots; 4 × M12 × 1.75 P on Ø 290 mm PCD
Material Steel alloy 40Ni6Cr4Mo3
Manufacturing Process Forged, flow-formed, heat-treated, machined
 • Unguided GP Bombs: Standard free-fall ordnance for area suppression.
 • Laser-Guided Munitions (Paveway Series): Integration of laser seeker kits for pinpoint strikes under clear-sky conditions.
 • GPS/INS-Guided Munitions (JDAM): Retrofittable tail-kits transform the MK-84 into all-weather “smart” bombs with CEP < 30 ft.
 • Sea Mines (Quickstrike): Conversion into rapid-deployment naval mines.
 • Bunker-Penetrating Warheads: Fitted with hardened nose plugs for deep concrete
penetration.
        

Key Features

  • High-Strength Alloy Construction
  • Aerodynamic, Low-Drag Design
  • Modular Compatibility
  • Full Traceability & QA

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Details

Introduction
The MK-84 2000 lb Bomb Casing serves as the hardened steel shell for the U.S. Mark 84 general-purpose aerial bomb, the largest in the 1,000-series family introduced during the Vietnam War. With a nominal weight of 2,000 lb (actual weight 1,972–2,028 lb depending on fin and fuze configuration), it houses approximately 945 lb of high-explosive fill—typically Tritonal or PBXN-109—enabling a crater up to 50 ft wide and 36 ft deep upon detonation. The casing’s low-drag, streamlined profile and precise machining ensure compatibility with both unguided delivery and a variety of precision-guidance kits (e.g.,Paveway, JDAM), making it a versatile warhead across all-weather and all-altitude missions.

Key Features
 • High-Strength Alloy Construction: Forged and heat-treated 40Ni6Cr4Mo3 steel provides a tensile strength of 1,100–1,250 MPa and Vickers hardness of 352–375 HV, balancing toughness and resistance to in-service stresses.
 • Aerodynamic, Low-Drag Design: Smooth, burr-free outer profile with flow-direction machining minimizes drag for stable, predictable ballistic performance.
 • Modular Compatibility: Six equispaced 7 mm slots and four M12 × 1.75 P tapped holes on a 290 mm PCD allow attachment of tail fins, guidance strakes, or handling fixtures—supporting variants from free-fall “dumb” bombs to GPS/INS “smart” munitions.
 • Full Traceability & QA: Each forging batch is accompanied by NABL-accredited chemical and mechanical test certificates; independent on-site sampling and testing are conducted if certificates are missing or incomplete.

Technical Specifications
Characteristic Value
Overall Length 2,480 mm
Maximum Diameter 457.10 mm
Nominal Weight 2,000 lb (907.2 kg); actual 1,972–2,028 lb
Explosive Filling 945 lb Tritonal or PBXN-109
Penetration Capability Up to 11 ft of reinforced concrete
Slots & Tapped Holes 6 × 7 mm slots; 4 × M12 × 1.75 P on Ø 290 mm PCD
Material Steel alloy 40Ni6Cr4Mo3
Manufacturing Process Forged, flow-formed, heat-treated, machined
Applications • Unguided GP Bombs: Standard free-fall ordnance for area suppression. • Laser-Guided Munitions (Paveway Series): Integration of laser seeker kits for pinpoint strikes under clear-sky conditions. • GPS/INS-Guided Munitions (JDAM): Retrofittable tail-kits transform the MK-84 into all-weather “smart” bombs with CEP < 30 ft. • Sea Mines (Quickstrike): Conversion into rapid-deployment naval mines. • Bunker-Penetrating Warheads: Fitted with hardened nose plugs for deep concrete penetration. Mechanical & Metallurgical Requirements • Ultimate Tensile Strength: 1,100–1,250 MPa • Yield Strength: ≥ 880 MPa • Elongation at Break: ≥ 11% • Hardness (Vickers): 352–375 HV • Forging & Flow Forming: Grain-flow orientation along the axis achieved via controlled multi-stage forging and/or flow-forming processes, enhancing fatigue resistance. • Heat Treatment: Quench and temper cycles precisely controlled to develop the required microstructure (tempered martensite) and avoid quench cracks. Non-Destructive Testing • Ultrasonic Testing (ASTM A388): Detection of internal discontinuities; flat-bottom hole (FBH) indications ≤ 1.2 mm accepted; reject on loss of back-reflection or < 10% FSH. • Magnetic Particle Testing (IS 3703:2004): Surface crack detection using head-tailstock or central conductor methods; zero tolerance for surface defects; full demagnetization post-test. • Radiography (MIL-STD 2154, where required): Verification of wall thickness uniformity and internal voids in high-stress regions. Component Inspection & Assembly • Incoming Material Inspection: Review of NABL certificates; random sampling for mechanical, chemical, and NDT verification if documentation is inadequate. • Dimensional Control: Coordinate-measuring machines (CMMs) verify all critical dimensions (slots, holes, chamfers) against the full-assembly drawing; results logged in Appendix B check sheets. • Gauge Calibration: All inspection tools calibrated to national standards; calibration dates and operator IDs recorded. • Assembly Sequence: Only components passing inspection proceed; fuzewell, closing disc, and nose plug are mechanically and hydraulically tested for seal integrity before final assembly. • Quality Assurance Sign-off: A formal release board signs off on every lot, confirming compliance with DP (Delivery Period) requirements. Conclusion The MK-84 2000 lb Bomb Casing combines proven aerodynamics, modular adaptability, and stringent metallurgical standards to deliver a warhead shell of exceptional reliability. Its traceable, high-strength alloy construction and rigorous NDT regime ensure safe handling, precise delivery, and consistent performance across a wide array of munitions roles—from legacy free-fall bombs to cutting-edge precision-guided systems.
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