MIL-PRF-907

What is MIL-PRF-907?

MIL-PRF-907 is a United States military performance specification that covers the requirements for a high-temperature anti-seize thread compound (paste).

This compound (formerly MIL-A-907) is designed to prevent seizing, galling, corrosion welding, and hydrogen embrittlement on threaded components and mating metal surfaces, ensuring that fasteners can be reliably assembled and easily disassembled, even after long-term exposure to high heat.

The compound consists of a semi-solid paste often formulated with metallic solids (such as lead, copper, or nickel particles) dispersed in a petroleum or synthetic vehicle. Key characteristics and applications include:

• Temperature Resistance: The compound is effective for use on threads and mating surfaces, including superheated steam installations, at temperatures up to 566°C (1050°F), with many commercial products exceeding this requirement.
• Corrosion Protection: It provides a protective layer that isolates joined metals from moisture and oxygen, preventing corrosion and galvanic action.
• High Pressure: The compound is capable of maintaining its integrity under high pressure, preventing leakage and strengthening the seal.

The product is essential for maintenance in heavy industrial equipment, aircraft, steam/gas turbines, refinery units, and boilers.

Equivalent Specifications & Codes

MIL-PRF-907 is related to other key thread compounds but is typically cited directly for the required high-temperature, steel-thread performance: