Screw Head Styles

Screw Head Styles

We supply a great deal of semi standard head styles including, modified truss heads, Round washer heads, cheese heads, slotted truss heads with serrations, pan heads with serrations, truss heads with serrations, hex washer head with 6 ½ moons nibs, Hex washer with torque breaking serrations, hex washer with locking serrations, k-lath, framing head, pocket screws, trim heads, Trim Oval, 100 degree flat heads, Jackson head, stove bolts, cyclone head, crimtite®head, & EsGrip® head.


Screw Head Styles

Head Style 

Description

Use

Pan
Pan
Slotted pan heads have a flat or gently rounded top surface, cylindrical sides and a flat bearing surface. Phillips, Torx® and square pan heads have a rounded top surface, cylindrical sides and a flat bearing surface.  
For general applications. Can be substituted in most applications for round, truss or binding heads.
Indented Hex
Indented Hex
Have an indented top surface, six flat sides, and a flat bearing surface.
Preferred in high volume assembly where pneumatic equipment is used to drive the screw. Can transmit significantly higher tightening torque levels than other head styles.
Indented Hex Washer
Indented Hex Washer
Has an indented top surface, six flat sides with a flat washer which projects beyond the sides and provides a flat bearing surface. The washer and hex are formed together as one piece.
Increased bearing surface reduces likelihood of crushing mating surfaces.
Serrated Hex Washer
Serrated Hex Washer

Same as an indented Hex Washer Head but with serrations formed into the bearing surface on the underside of the washer.

Available slotted or un-slotted
Serration geometry is oriented to resist loosening. Also slows the screw at the point of engagement with the mating piece of sheet metal so as to minimize stripping.
Truss
Truss

Has a rounded top with a flat bearing surface greater in area than a round head screw of the same nominal size.

Full contour Truss heads also available.
Weaker than pan or round heads but preferred in applications where minimal clearance exists above the head. Truss profile provides a trim finished appearance.
Wafer
Wafer
A countersunk head with a flat top surface and a cone-shaped bearing surface. The wafer's 70° conical under head area does not extend to the outer edge of the head, providing a bearing surface of 16° around the circumference of the under head.
Preferred head style for Type-CSD self drilling screws. Provides the necessary bearing surface and flush fit in wood and softer materials. The head/shank fillet is contoured to strengthen the under head area.
Oval 82
Oval 82°
A countersunk head with a rounded top surface and a cone-shaped bearing surface of approximately 82°.
Preferred over a flat head in conical applications, or when a more decorative finished look is desired. The countersunk surface nests into mating countersunk application sites.
Oval Undercut 82
Oval Undercut 82°
Similar to an 82° oval head except that the head is undercut to 70% of its normal side height.
Standard for short lengths because it allows greater thread length.
Bugle
Bugle
A countersunk head with a flat top and a concave under head bearing surface.
Designed specifically for use in drywall. Distributes bearing stress over a wider area than flat heads.
Flat 82
Flat 82°
A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 82°.
Used in applications where protrusion of the fastener above the mating surface is unacceptable. Use a protrusion gage when measuring head height.
Flat Undercut 82
Flat Undercut 82°
Similar to an 82° flat head except that the head is undercut to 70% of its normal side height.
Standard for short lengths because it allows greater length of threads. Also avoids transition fillet and assembly interference.
Metric Flat 90
Metric Flat 90°
A countersunk head with a flat top surface and a cone-shaped bearing surface with a head angle of approximately 90°
Used in applications where protrusion of the fastener above the mating surface is unacceptable. Use a protrusion gage when measuring head height.
Metric-Oval 90
Metric Oval 90°
A countersunk head with a rounded top surface and a cone-shaped bearing surface of approximately 82°.
Preferred over a flat head in conical applications, or when a more decorative finished look is desired. The countersunk surface nests into mating countersunk application sites.
Round
Round
General purpose head with high crown and deep recess but the diameter is smaller than a pan head.
For general applications and where the requirement of a smaller head OD in application.
Fillister
Fillister

The-standard fillister head has a smaller diameter than the round head. Fillister is higher with a correspondingly deeper slot.

Fillister heads can be shaved & drilled.
The smaller diameter head increases the pressure applied on the smaller area and can be assembled close to flanges and raised surfaces. Headed in counter bored dies to Insure concentricity, they may be used successfully in counter bored holes. Also used heavily in electrical applications

Contact Eagle Fastener

Eagle Fastener Corporation
453 E. Dartmoor Drive
Crystal Lake, IL 60014
Mailing Address: PO Box 1259
Crystal Lake, IL 60039-1259
800 . 323 . 6142 ( t )
815 . 455 . 7177 ( t )
815 . 455 . 7205 ( f )
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