Round Head U Drive Screws
Specifications and Dimensions



Drive Screws - Round Head Type U

Nominal
Screw
Size
Number
of
Thread
Starts
D A H P Recommended
Hole Size
Outside Diameter Head Diameter Head Height Pilot Diameter
Max Min Max Min Max Min Max Min Drill Size
No.
Hole
Diameter
00 6 .060 .057 .099 .090 .034 .026 .049 .046 55 .052
0 6 .075 .072 .127 .118 .049 .041 .063 .060 51 .067
2 8 .100 .097 .162 .146 .069 .059 .083 .080 44 .086
4 7 .116 .112 .211 .193 .086 .075 .096 .092 37 .104
6 7 .140 .136 .260 .240 .103 .091 .116 .112 31 .120
7 8 .154 .150 .285 .264 .111 .099 .126 .122 29 .136
8 8 .167 .162 .309 .287 .120 .107 .136 .132 27 .144
10 8 .182 .177 .359 .334 .137 .123 .150 .146 20 .161
12 8 .212 .206 .408 .382 .153 .139 .177 .173 11 .191
14 9 .242 .236 .457 .429 .170 .155 .202 .198 2 .221



Drive Screw Pilot Lengths

L Nominal Screw
Length
1/8 3/16 1/4 5/16 3/8 1/2 5/8 3/4 1 inch
and
over
S Pilot Length .047 .047 .047 .047 .062 .062 .078 .078 .125



Drive Screw Tolerances on Length

L Nominal Screw
Length
1/8 3/16 1/4 5/16 3/8 1/2 5/8 3/4 1 inch
and
over
Tolerance on Length L +/- .02 +/- .02 +/- .02 +/- .02 +/- .02 +/- .03 +/- .03 +/- .03 +/- .03



  • Description:   Round head metallic drive screw having multiple start threads of large helix angle, with a pivot.
  • Applications & Advantages:   For making permanent fastenings in metals and plastics, when forced into the work under pressure.
  • Material:    Steel: AISI 1016 - 1024 or equivalent steel.
  • Heat Treatment:   Quenched in liquid and then tempered by reheating to 650°F minimum
  • Surface Hardness:   Rockwell C45 Minimum
  • Case Depth:   No. 2 thru 6 Diameter - .002 - .007, Nos. 7 thru 12 diameter - .004 - .009
    No. 14 diameter: .006 - .011
  • Core Hardness:    Rockwell C28 - C38
  • For Us In:    Drive screws shall produce mating threads without shearing of threads or fracture of the screw when driven into properly sized holes in test plates havind a Rockwell hardness of B70 to B85.
  • Plating:   See plating page for more information.




Smith Fastener Company • 3613 East Florence Avenue, Bell, California, 90201
Phone: ( 323 ) 587-0382 • FAX: ( 323 ) 587-8712 • E-mail: sales@smithfast.com
Copyright © 2009 by Smith Fastener Company

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