M9 ACE COMBAT EXCAVATOR 13215E6591-1 MACHINE BOLT FF-B-575 5306-01-198-4146 USA

FF-B-575 Machine Bolt (5306-01-198-4146)

Grade 8 steel hex head machine bolt with slotted head, 5/16-18 UNC thread, per FF-B-575, for the M9 ACE.

Part Information

• Part Number: FF-B-575
• NSN: 5306-01-198-4146
• End Item: M9 ACE

Specifications

• Thread Class: 2A
• Thread Direction: Right-hand
• Thread Length: 0.718 in nominal
• Fastener Length: 0.850–0.880 in
• Head Height: 0.188–0.198 in
• Width Between Flats: 0.489–0.500 in
• Nominal Thread Diameter: 0.312 in
• Threads Per Inch: 18
• Thread Series: UNC
• Minimum Tensile Strength: 150,000 PSI
• Minimum Yield Strength: 130,000 PSI
• Hardness: Rockwell C 32.0–38.0
• Material: Steel (comp 1013–1541 range per SAE J429)
• Type 2, Grade 8
• Special Features: 6 slots in top of head at any angle relative to hexagon