Description
Add a specialized piece of Cold War U.S. self-propelled artillery hardware to your collection with this 155mm M109 Howitzer SP Adapter, identified by Part Number 11643813 and FSN 1025-120-0416. This component was manufactured by MKB Mfg Corp and is tied to the support hardware used around large-caliber U.S. artillery systems.
Public FSC/NSN index data lists 1025-00-120-0416 as Adapter, Elevating Mechanism. The item falls under FSC 1025 – Guns, over 150mm through 200mm, matching its association with 155mm artillery equipment.
Historical Significance
The M109 155mm self-propelled howitzer became one of the most important U.S. artillery platforms of the Cold War. It represented the move toward mobile, armored artillery that could keep pace with mechanized forces, fire from protected positions, and relocate more quickly than traditional towed guns.
The M109 family was introduced in the early 1960s and first produced in 1963. It became a major 155mm self-propelled artillery system for U.S. and allied forces. U.S. Army accounts also connect the M109 directly to Vietnam War service, including use by field artillery crews on firebases.
That history gives this adapter strong collector value. It represents the smaller mechanical support hardware behind a major artillery system, not a generic surplus fitting.
The M109 SP Adapter
This component is identified as an Adapter, Elevating Mechanism. In artillery systems, the elevating mechanism is part of the hardware that helps position the cannon in elevation. Components in this area were essential to the operation, adjustment, and support of the larger gun system.
Known identification details include:
- Item: 155mm M109 Howitzer SP Adapter
- Catalog Nomenclature: Adapter, Elevating Mechanism
- Part Number: 11643813
- FSN: 1025-120-0416
- NSN: 1025-00-120-0416
- NIIN: 00-120-0416
- Federal Supply Class: 1025 – Guns, over 150mm through 200mm
- Manufacturer: MKB Mfg Corp
- Associated Equipment: 155mm M109 self-propelled howitzer family
- Item Type: U.S. military-surplus artillery hardware component
- Included Item: Adapter only, unless otherwise shown or stated
Because military surplus components can appear under older FSN formats, later NSN formats, drawing numbers, and manufacturer references, buyers working on a specific restoration should verify fitment against their own parts manual, vehicle configuration, and technical documentation.
Why This Part Matters
The M109 Howitzer is a major U.S. artillery platform with a long service history. Large systems like the M109 depended on many smaller adapters, brackets, links, shafts, cylinders, pins, and mounting components to function as complete field weapons.
This adapter helps preserve that support story. It is a part-numbered artillery component tied to a specific mechanical function within the larger system. For collectors and restorers, that gives it more value than an unmarked surplus part.
It pairs well with M109 howitzer manuals, 155mm artillery displays, self-propelled artillery collections, elevating mechanism references, Cold War vehicle parts, and U.S. Army ordnance hardware displays.
About This Adapter
This listing is for one 155mm M109 Howitzer SP Adapter, identified by P/N 11643813 and FSN 1025-120-0416. This product was manufactured by MKB Mfg Corp.
This listing is for the adapter component only unless otherwise stated. No complete howitzer, cannon, elevating mechanism assembly, vehicle, ammunition, tools, manuals, storage case, or additional accessories are included unless specifically shown or noted.
This item is intended for collection, display, restoration reference, historical research, or military surplus parts study.
Ideal For
This adapter is a strong fit for:
- 155mm M109 Howitzer collectors
- Cold War self-propelled artillery displays
- Vietnam War artillery collections
- M109 restoration-reference projects
- U.S. Army surplus parts collectors
- artillery elevating mechanism reference collections
- museum and archival ordnance exhibits
Approx length 2.5", Approx width 2", Approx height 2", Approx weight 1lbs.
Pictures are stock images of our inventory. Unless otherwise noted, you will not be receiving the exact item shown in the pictures. The pictures are representative of the item's general condition. The item you receive might be slightly better, or worse, condition than was shown in the pictures.
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