Bulk #4-40 Phillips Flat-Undercut Thread-Cutting Screws — Type F, Bright-Zinc Steel ISO 4035 Head / Drive: Unslotted indent

Head / Drive: Unslotted indent hex-washer (5⁄16″ A/F) — smooth top forge

Head Style: Pan head provides wide contact and low-profile appearance

Material: Alloy steel with a durable thermal black oxide coating for a smooth

DIN 934 Class 10 Hex Nuts are designed for strength and reliability

Improved Tuning Stability: Locking nuts clamp strings in place to prevent slippage

Bulk #4-40 Phillips Flat-Undercut Thread-Cutting Screws — Type F, Bright-Zinc Steel ISO 4035 Head / Drive: Unslotted indentMonster Overview: When standard countersinks are too shallow or sheet metal is wafer thin, choose #4 40 Phillips Flat Undercut Thread Cutting Screws. The undercut head trims most of the 82 cone, giving you maximum thread engagement while finishing perfectly flush in sheet as thin as 0. 040. Heat treated carbon steel sports a brilliant bright zinc electro plate, is hydrogen relief baked to banish embrittlement, and topped with a factory dry wax film