Description
M26/XM27 Cupola Cover Latch
The M26/XM27 Cupola Cover Latch, officially identified as Latch, Cupola Hatch Cover, is a commander's hatch component used across the M26 manual cupola, M26 powered cupola, and XM27 powered cupola.
Identified by Army P/N 10936634, this latch carries legacy FSN 1005-066-2553 and current NSN 2510-00-066-2553. It belongs to the cupola hatch assembly rather than the mounted machine gun or cannon.
Historical Significance
The M26 and XM27 cupolas were part of the U.S. Army's Cold War-era M114 Command and Reconnaissance Armored Carrier family. M26 cupolas supported .50-caliber machine-gun installations, while the powered XM27 cupola was associated with the 20mm M139 gun installation on the M114A1E1, later known as the M114A2.
Although this latch's earlier supply number used weapons-class FSC 1005, the same item identification was later assigned to vehicular structural components under FSC 2510. The M26 cupola designation is unrelated to the M26 Pershing tank.
M26 and XM27 Cupola Applications
Army TM 9-1005-307-24P assigns this latch usable-on code E, meaning it is common to all three cupolas covered by the manual.
- M26 manual cupola with .50-caliber machine-gun mount
- M26 powered cupola with .50-caliber machine-gun mount
- XM27 powered cupola with 20mm gun mount
What This Item Is and Does
The M26/XM27 Cupola Cover Latch is an individual steel latch used in the commander's hatch-cover mechanism. It works with the related latch pin, torsion spring, catch, and hatch-cover hardware to retain the cupola cover.
The Army parts manual places it in Group 4000, Hatch Cover and Related Parts, as Figure 33 and Figure 77, item 4. The listed installation quantity is one latch per cupola.
Key Features
- Official name: Latch, Cupola Hatch Cover
- Army part number: 10936634
- Obsolete alternate part number: 12277477
- Legacy Federal Stock Number: 1005-066-2553
- Current National Stock Number: 2510-00-066-2553
- Manual reference: TM 9-1005-307-24P, Group 4000, Figures 33 and 77, item 4
- Application code: E, common to all covered cupolas
- Construction: Steel casting with zinc-phosphate coating and enamel finish
- Approximate dimensions: 4.16 inches long x 3.38 inches wide x 0.95 inches thick
- Pin-hole diameter: 0.77 inch
- Quantity installed: One per cupola
Why This Item Matters
This latch is a specifically identified part of the M114-family commander's cupola rather than generic hatch hardware. Its documented use across all three M26/XM27 cupola configurations makes it useful for restoration research and parts comparison.
The legacy FSN, current NSN, and two Army part numbers also illustrate how one component remained identifiable as military supply classifications changed.
About This Item
The offered item is an M26/XM27 Cupola Cover Latch identified by P/N 10936634. The 1971 package uses legacy FSN 1005-066-2553; the current classification is NSN 2510-00-066-2553. Obsolete P/N 12277477 cross-references to the same item.
All items are opened from the original packaging to verify its condition before shipment. If your prefer to receive an item in its original, unopened packaging, please indicate your request in the order comments at checkout.
Please Note: If you request an item in its original, unopened packaging, we are unable to verify the item's condition prior to shipment.
Ideal For
This item is a strong fit for:
- M114, M114A1, and M114A1E1/M114A2 restoration research
- M26 and XM27 cupola parts collections
- Military-vehicle museums and educational exhibits
- Cold War armored-vehicle collectors
- U.S. Army technical and logistics reference collections
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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