Bulk #4-40 Phillips Flat-Undercut Thread-Cutting Screws — Type F, Bright-Zinc Steel Type_Tools - Hex Keys Material: 18-8 (A2) stainless steel

Material: 18-8 (A2) stainless steel for excellent corrosion resistance and strength

and other builds that need a stainless flange head with a back-up slot

and industrial users

Material: Hardened Alloy Steel for maximum strength

Ensure a clean and professional finish with #6-20 Trim Head Square Self-Drilling Screws in Zinc CR+3 coating

Bulk #4-40 Phillips Flat-Undercut Thread-Cutting Screws — Type F, Bright-Zinc Steel Type_Tools - Hex Keys Material: 18-8 (A2) stainless steelMonster 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