Stainless Steel Slotted Flat Head Machine Screws

Where a slotted flat head fits

The countersunk flat head seats flush in a matching countersunk hole for a smooth surface, and the single slot suits traditional and restoration work or anywhere a period-correct look is wanted. Slotted drives are simple and easy to clean out, though they offer less bit grip than Phillips or star under power driving, so they are best driven by hand or at low speed. In stainless, they resist rust on visible and outdoor hardware, with 316 for coastal exposure.

Why choose slotted flat head machine screws

Flush finish: countersunk head sits level with the surface.
Traditional look: single slot suits restoration and classic hardware.
Easy to clean: the slot clears paint and debris simply.
Corrosion resistance: holds up in wet and outdoor use.

Common applications for slotted flat head machine screws

Restoration and historic hardware
Flush-surface panels and covers
Switch plates and visible fixtures
Marine and outdoor hardware (use 316)

For a pan head that sits on the surface, see stainless Phillips pan head machine screws, and browse all heads and drives on the main machine screws category.

Slotted Flat Head Machine Screws FAQ

Why use a slotted drive over Phillips?

Slotted drives suit traditional and restoration work and are easy to clean out. They offer less bit grip, so they are best driven by hand or at low speed.

Does a flat head need a countersunk hole?

Yes. A countersunk hole lets the flat head seat flush with the surface, which is the point of the flat head style.

Should I use 18-8 or 316?

18-8 suits most indoor and outdoor use. For coastal or saltwater exposure, choose 316 for the best corrosion resistance.