Teardown of M557 Point-Detonating Fuze 75mm to 203mm Recoilless Howitzer Gun & Mortar Artillery Ammo

Published on July 6, 2024
Duration: 1:00

This video provides an expert-level teardown of the M557 Point-Detonating Fuze, demonstrating its disassembly and integration with artillery and mortar rounds. The guide highlights the fuze's 'SQ' and 'DELAY' settings, internal clockwork mechanisms, and the M125A1 Booster. It emphasizes the importance of handling inert ordnance with caution.

Quick Summary

The M557 Point-Detonating Fuze offers 'SQ' (Super Quick) and 'DELAY' (0.05 sec) settings, adjusted with a flathead screwdriver. It integrates with 75mm-203mm artillery and mortars, featuring an M125A1 Booster and complex internal clockwork mechanisms for detonation.

Chapters

  1. 00:00Introduction and Storage of M557 Fuzes
  2. 00:05M557 Fuze Settings: SQ vs. DELAY
  3. 00:15Disassembly: M125A1 Booster Detachment
  4. 00:32Internal Mechanisms and Firing Pin Assembly
  5. 00:49Mortar Round Integration: M557 on M329A2

Frequently Asked Questions

What are the different settings available on the M557 Point-Detonating Fuze?

The M557 fuze features a selector switch that allows users to choose between 'SQ' (Super Quick) detonation for immediate impact, or a 'DELAY' setting, which provides a short delay (approximately 0.05 seconds) before detonation. This is adjusted using a flathead screwdriver.

What is the M125A1 Booster and how does it connect to the M557 fuze?

The M125A1 Booster is a component that attaches to the lower section of the M557 fuze. It features a threaded interface that screws into the main fuze body, facilitating its integration with artillery or mortar projectiles.

What types of artillery and mortar rounds is the M557 fuze compatible with?

The M557 Point-Detonating Fuze is designed for compatibility with a wide range of artillery and mortar ammunition, typically spanning calibers from 75mm up to 203mm. The video specifically shows its integration with a 4.2-inch mortar round.

More from Ordnance

View all →