Y Slot Screws

  1. Y Slot Screw Head
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Slotted and Phillips screwdrivers work with metric screws, but you must use metric hex keys with metric hex socket screws. Also, Phillips, square, hex and Torx® drive screws are popular because there's less chance for the driver to slip out and scratch finish work. Hex head, like hex cap screws, require a wrench or socket.

Like nails, screws are (usually) small pieces of hardware used to hold materials together. One of the main differences is that screws are designed to be able to be removed and replaced easily without damage to the screw itself or the material it connects. Most screws are made from some type of metal, and many are covered in a rustproof coating. Aside from material, screws differ in head shape, head type, threading and purpose.

Machine screws are designed to hold pieces of machinery together. Most machine screws require that the hole already be drilled and threaded, although there are a few types of machine screws capable of tapping their own holes. Like other screws, machine screws are available in a variety of shapes and sizes. Pan head machine screws are machine screws with heads that are flat on top and rounded on the sides. They're similar to oval head machine screws, which also have rounded sides; the difference is that oval head screws have a rounded top, too, as opposed to a flat top, and they have tapered bases. Both are commonly used for metal applications. Pan head machine screws can also be differentiated from flat head screws, which have flat tops, as well. However, flat head screws are tapered on the underside of the head so they can lie flush with the material they're driven into. Meanwhile, round head screws have flat bottoms with rounded heads, much like half a sphere. Round head screws can't sit flush with the material they're driven into; instead, their heads poke out like little bumps.

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  2. Slot head screws are driven by a flat-bladed screwdriver. Cross-head or Phillips screws have an X-shaped slot and are driven by a cross-head screwdriver, designed originally in the 1930s for use with mechanical screwing machines, intentionally made so the driver will ride out, or cam out, under strain to prevent over-tightening.
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Pan head machine screws can be designed with a variety of head types, too. A slotted pan head machine screw has a single cut in the head for use with a straight screwdriver. Philips pan head machine screws have a cross cut into the top for use with a Philips screwdriver.

msflathead

82°
Flat Head
82° Undercut
Flat Head
100°
Flat Head
Torx® Drive
Flat Head
Square Drive
Flat Head
Pozidriv°
(Type 1A)
Flat Head

Head Dimensions for 82° Flat Head Machine Screws
ANSI B18.6.3 – 1998

Nominal
Size
AHJTMRNFGPhillips
Driver
Size
Head Dimensions *Slot DimensionsRecess DimensionsProtusion Above
Gaging Diameter
Gaging
Diameter
DiameterHeightWidthDepthDiaDepthWidth
MaxMinMaxMinMaxMinMaxMinRefRefRefMaxMin
0.112.096.035.026.023.016.015.010.062.035.014.026.016.0780
1.137.120.043.033.026.019.019.012.070.043.015.028.016.1010
2.162.144.051.040.031.023.023.015.096.055.017.029.017.1241
3.187.167.059.047.035.027.027.017.100.060.018.031.018.1481
4.212.191.067.055.039.031.030.020.122.081.018.032.019.1721
5.237.215.075.062.043.035.034.022.148.074.027.034.020.1962
6.262.238.083.069.048.039.038.024.168.094.029.036.021.2202
8.312.285.100.084.054.045.045.029.182.110.030.039.023.2672
10.362.333.116.098.060.050.053.034.198.124.032.042.025.3132
12.412.380.132.112.067.056.060.039.262.144.035.045.027.3623
1/4.477.442.153.131.075.064.070.046.276.160.036.050.029.4243
5/16.597.556.191.165.084.072.088.058.358.205.061.057.0345.5394
3/8.717.670.230.200.094.081.106.070.386.234.065.065.039.6534
1/2.815.765.223.186.106.091.103.065.418.265.069.081.049.7394
* Edge of head may be rounded or flat.

Head Dimensions for 100° Flat Head Machine Screws
ANSI B18.6.3

Nominal
Size
AHJTMRNFGPhillips
Driver
Size
Head Dimensions *Slot DimensionsRecess DimensionsProtusion Above
Gaging Diameter
Gaging
Diameter
DiameterHeightWidthDepthDiaDepthWidth
MaxMinMaxMinMaxMinMaxMinRefRefRefMaxMin
0.112.095.026.019.023.016.013.008.054.027.013.020.012.0740
2.162.142.037.029.031.023.019.012.088.048.012.022.014.1211
4.212.188.049.039.039.031.024.017.110.070.018.025.016.1671
6.262.235.060.049.048.039.030.022.148.074.027.028.017.2142
8.312.282.072.060.054.045.036.027.162.090.028.031.019.2612
10.362.329.083.070.060.050.042.031.178.104.030.034.021.3072
1/4.477.437.110.094.075.064.055.042.240.124.033.040.025.4153
* Edge of head may be rounded or flat.

Y Slot Screw Head

Head Dimensions for Undercut Flat Head Machine Screws
ANSI B18.6.3

T Slot Screws

Nom
Size
LAHJTMRNFGPhillips
Driver
Size
These
Lengths
or Shorter
are
Undercut
Head Dimensions *Slot DimensionsRecess DimensionsProtusion Above
Gaging Diameter
Gaging
Diameter
DiameterHeightWidthDepthDiaDepthWidth
MaxMinMaxMinMaxMinMaxMinRefRefRefMaxMin
01/8.112.096.025.018.023.016.011.007.062.035.0140
11/8.137.120.031.023.026.019.014.009.070.043.0150
21/8.162.144.036.028.031.023.016.011.088.048.017.029.017.1241
43/16.212.191.047.038.039.031.022.014.110.070.018.032.019.1721
53/16.237.215.053.043.043.035.024.016.122.081.018.034.020.1961
63/16.262.238.059.048.048.039.027.017.140.066.025.036.021.2202
81/4.312.285.070.058.054.045.032.021.168.094.029.039.023.2672
105/16.362.333.081.068.060.050.037.024.182.110.030.042.025.3132
123/8.412.380.092.078.067.056.043.028.226.110.030.045.027.3623
1/47/16.477.442.107.092.075.064.050.032.244.124.032.050.029.4243
5/161/2.597.556.134.116.084.072.062.041.310.157.053.057.034.5394
3/89/16.717.670.161.140.094.081.075.049.358.205.061.065.039.6534
1/23/4.815.765.156.130.106.091.072.046.402.252.068.081.049.7394

Head Dimensions for Torx® Drive Flat Head Machine Screws – Camcar

Nominal
Size
GTBFMax
Penetration
of “No-Go”
Gauge
(Fallaway)
Torx®
Driver
Size
Head DiameterHead HeightRecess
Diameter
Gauge
Penetration
Max
Sharp
Min
Sharp
Abs MinRefRefMin
4.225.209.195.067.094.028.019T8
6.279.257.244.083.111.035.022T10
8.332.308.292.100.132.040.026T15
10.385.359.340.116.155.050.031T20
1/4.507.477.452.153.200.075.040T27
Torx° is a trademark of the Camcar Corporation, division of Textron Industries.

Head Dimensions for Square Socket Flat Head
Machine Screws – IFI

Screws
Nominal
Size
or Basic
Screw Diameter
AHMTDriver
Size
Head DiameterRecess
Square
Recess DepthRecess Penetration
Gaging Depth
MaxMinMaxMinMaxMinMaxMin
4.1120.212.191.071.0696.073.063.038.0320
6.1380.262.238.091.090.113.105.065.0571
8.1640.312.285.1126.111.140.119.075.0652
10.1900.362.333.1126.111.140.119.075.0652
12.2130.412.380.133.1315.165.155.095.0853
1/4.2500.477.442.133.1315.165.155.095.0853
5/16.3125.597.556.191.1895.201.191.100.0904
This type of recess has a square opening, slightly tapered sides and a conical bottom.

Head Dimensions for Posidriv® Flat Head Machine Screws
ASME B18.6.3 – 1998

Nominal
Size
AHMRNRecess
Penetration
Gaging
Depth
FGDriver
Size
Head DimensionsRecess DimensionsProtrusion Above
Gaging Diameter
Gaging
Diameter
DiameterHeightDiaDepthWidth
MaxMinMaxMinRefRefRefMaxMinMaxMin
2.162.144.051.040.096.055.029.053.037.029.017.1241
4.212.191.067.055.122.081.030.079.063.032.019.1721
6.262.238.083.069.168.098.041.091.073.036.021.2202
8.312.285.100.084.182.112.041.107.089.039.023.2672
10.362.333.116.098.198.127.041.122.104.042.025.3132
12.412.380.132.112.262.149.056.136.118.045.027.3623
1/4.477.442.153.131.276.164.057.151.133.050.029.4243
5/16.597.556.191.165.358.211.086.193.175.057.034.5394
3/8.717.670.230.200.368.239.086.222.204.065.039.6534
Posidriv® is a registered trademark of the Phillips Screw Company. Our fasteners with the “1A-drive”
are not manufactured by or connected with the producers of Pozidrive® fasteners.

See also:
Slotted Flat Head Cap Screws
Machine Screw Drive Types
Machine Screw Head Styles