Bulk #4-40 Phillips Flat-Undercut Thread-Cutting Screws — Type F, Bright-Zinc Steel Type_Tools - Hex Keys and other builds that need

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

The zinc yellow CR+3 finish offers enhanced corrosion resistance and high visibility while remaining RoHS compliant

Size & Thread: 1/4"-28 UNF (Fine Thread)

250″ steel plate or hardwood planks

and industrial users

Bulk #4-40 Phillips Flat-Undercut Thread-Cutting Screws — Type F, Bright-Zinc Steel Type_Tools - Hex Keys and other builds that needMonster 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