What Is a Small Pan Head Screw?
Small pan head screws, including pan head machine screws and cross-recessed types, are named for their overturned pot-like head shape. These screws are typically used with female threads or nuts, featuring a flat threaded end.
Commonly paired with metal washers, small pan head screws are versatile in applications and sometimes referred to as “cross-hole small pan head screws.”
The standard for these screws is ANSI/ASME B 18.6.3, covering machine screws, tapping screws, and metallic drive screws.
Uses of Small Pan Head Screws
Small pan head screws are utilized in a diverse range of sectors, including industrial machinery, home appliances, and toys. They differ from bolts in head shape and size, with screws typically ranging from M2 to M8 sizes.
Principle of Small Pan Head Screws
Small pan head screws are fastened by inserting a Phillips screwdriver into their cross-shaped hole. This differs from hexagonal bolts which require a wrench. Their deeper cross-hole head allows for stronger tightening force compared to countersunk screws.
These screws come in two types of screwdriver insertion holes: the cross-shaped “plus” and the mixed “plus/minus” types, and their length is measured excluding the head height.
Other Information on Small Pan Head Screws
1. Main Materials and Surface Treatment
Materials range from steel and brass to aluminum and titanium, with plastics like polycarbonate and nylon also used. Surface treatments such as electroplating and anodizing are applied for corrosion resistance.
2. Proper Use and Tightening Tools
Proper use involves ensuring the tightening force is within allowable limits to prevent damage. For tightening, a Phillips screwdriver or other suitable tools should be used, matching the size of the screw head’s cross-hole.
3. Loosening Prevention
Adhesives or specially treated bolts can be used to prevent loosening of small pan head screws.