Brass Screws
 
Types of Head
 
Recessed Head :
 
 

 

A recessed head is a head having specially formed indentation or recess centered in its top surface. The common forms of recessed heads are the "Cross Recess", "Clutch Recess" and "Square Recess"

  
Slotted Head :
A slotted head is a head having a slot centered across its top surface.
Ball Head :
 A ball head is a head approximately spherical in shape.
Binding Head :
    The binding head is a rounded top surface, slightly tapered side surface and a flat bearing surface, a portion of which is sometimes undercut adjacent to the shank.  
Button Head :
A button head as applied to threaded fasteners has a low rounded top surface with a large flat bearing surface.
Fillister Head :
The fillister head has a rounded top surface, cylindrical side surface and a flat bearing surface.
Flat Fillister Head :
The flat fillister head is a flat top surface, cylindrical side surface and a flat bearing surface.
Flat Head :
The flat head has a flat top surface and a conical bearing surface with head angle of nominally 82 degrees.
Flat Trim Head :
The flat trim head has a smaller head diameter and lower head height than the standard flat head.
Flat Undercut Head :
   

The flat undercut head is basically the same as the standard 820 flat head except it is undercut to 70 percent of the basic head height.

  
Hex Head :
The hex head has a flat or indented top surface, six flat sided and a flat bearing surface.
Hex Flange Head :
The hex flange head is a circular flange upon which a hex head is formed.
Hexagon Washer Head :
The hexagon washer head is a washer head upon which a hexagon head is formed.
Oval Head :
The oval head has a rounded top surface and a conical bearing surface with head angle of nominally 82 degrees.
Oval Trim Head :
   

The oval trim head has a smaller head diameter and lower head height than the standard oval head with a controlled radius at the junction of the top and the conical bearing surface.

  
Oval Undercut Head :
    The oval undercut head is the same basic head as the standard oval head except it is shorter. The screw head is undercut to 70 percent of the basic head side height to afford a greater length of thread.  
Pan Head :
   

The pan head has a flat bearing surface and a flat top surface rounding into a cylindrical side surface. On recessed pan heads, the top surface is semi-elliptical, rounding into a cylindrical side surface.

  
Round Head :
The round head has a semi-elliptical top surface and a flat bearing surface.
Round Countersunk Head :
The round countersunk head is a circular head having a flat top surface and conical bearing surface.
Round Washer Head :
The round washer head is a washer head upon which a round head is formed.
Socket Head :
    The socket head has a flat chamfered top surface with smooth or knurled cylindrical side surface and a flat bearing surface. A hexagon socket is usually formed in the center of the top surface.  
Square Head :
    The square head has a flat top surface, four flat sides and a flat bearing surface. Square heads on set screws have a rounded top surface and may have an underhead construction tapered or radiused directly into the body.  
T-Head :
The T-head is an oblong shaped head, having a rounded top surface, flat sides and a flat bearing surface.
Truss Head :
   

The truss head has a low rounded top surface with a flat bearing surface. For a given screw size, the diameter of the truss head is larger than the diameter of the corresponding round head. It is sometimes called "Oven HEad" or "Stove Head".

 
Twelve-Point Head :
    The twelve-point head has a flat or indented top surface, twenty four short flat sides, a circular collar at the bottom of the head and a flat bearing surface. It is sometimes called "Double Hexagon Head".  
Washer Head :
    A washer head is a head having a circular colalr with a large flat bearing surface upon which various other head styles are integrally super-imposed.  
Button Head :
    A button head is a circular head having a hemispherical top surface and a flat bearing surface. It is sometimes called "Round Head".  
High Button Head :
    A high button head is a circular head having a high semi-elliptical top surface and a flat bearing surface. It is sometimes called "Acorn Head".  
Cone Head :
A cone head is a high conical head with a small, flat truncated top and a flat bearing surface.
Countersunk Head :
    A countersunk head is a circular head having a flat top surface and a conical bearing surface with head angles that vary with the rivet type.  
Flat Top Countersunk Head (with Chamfered Top) :
This head is similar to flat top countersunk head but a chamfered top.
Round Top Countersunk Head :
A round top countersunk head is a circular head having a rounded top surface and a conical bearing surface with a head angle of 78~.
Flat Head :
A flat head is a low cylindrical head having a flat top, rounded side surface and a flat bearing surface.
Globe Head :
A globe head is a head approximately spherical in shape.
Machine Head :
A machine head is a high inverted conical head with a large flat top, tapered side surface and a small flat bearing surface.
Steeple Head :
A steeple head is a sharp conical head having a flat bearing surface.
Truss (Wagon Box) Head :
A truss head is a large circular head having a low rounded top surface and flat bearing surface.
Points
The point of a fastener is the configuration of the end of the shank of a headed fastener or of each end of a headless fastener.
Chamfer Point :

A chamfer point is a truncated cone point, the end of which is approximately flat and perpendicular to the fastener axis. These points on threaded fasteners generally have point included angles of 45 to 90 degrees and a point diameter equal to or slightly less than the minor diameter of the thread. This point is intended to facilitate entry of fasteners into holes at assembly.
Cone Point :
A cone point is a sharp conical point designed to perform perforating or aligning functions at assembly.
Gimlet Point :
A gimlet point is a threaded cone point usually having a point angle of 45 to 50 degrees. It is used on thread forming screws such as type "AB" tapping screws, wood screws, lag screws etc.
Needle Point :
A needle point is a cone point of long length intended to perform a piercing function.
Oval Point :
An oval point is a radiused point, sometimes referred to as a "Crowned End" or "Round Point".
Pilot Point :
A pilot point is a cylindrical point having a diameter somewhat smaller than the shank diameter. It is designed to facilitate the alignment and starting of such fasteners as drive screws and groove pins into holes at assembly.
Threads
Normal Size
d
Pitch
P
dh
H13
dp
h131)
dt2)
h16
dz
h14
z1
+ IT14
z2
+ IT14
z3
+IT14
z4
~
z5
~
W
min.
1
0,25
-
0,5
-
-
-
0,5
-
-
-
-
1,2
0,25
-
0,6
-
-
-
0,6
-
-
-
-
1,4
0,3
-
0,7
-
0,7
0,35
0,7
-
-
-
-
1,6
0,35
-
0,8
-
0,8
0,4
0,8
-
-
-
-
1,8
0,35
-
0,9
-
0,9
0,45
0,9
-
-
-
-
2
0,4
0,6
1
-
1
0,5
1
0,5
0,25
0,4
0,7
2,2
0,45
0,6
1,2
-
1,1
0,55
1,1
0,55
0,3
0,5
0,8
2,5
0,45
0,6
1,5
-
1,2
0,63
1,25
0,63
0,35
0,6
0,9
3
0,5
0,6
2
-
1,4
0,75
1,5
0,75
0,4
0,8
1,2
3,5
0,6
0,8
2,2
-
1,7
0,88
1,75
0,88
0,45
0,9
1,2
4
0,7
0,8
2,5
-
2
1
2
1
0,5
1
1,5
4,5
0,75
0,8
3
-
2,2
1,12
2,25
1,12
0,55
1,25
1,8
5
0,8
1
3,5
-
2,5
1,25
2,5
1,25
0,6
1,5
2
6
1
1
4
1,5
3
1,5
3
1,5
0,7
1,75
2,5

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