Ohio Rod Products offers long length fasteners and small diameter fasteners. Ohio Rod Products, part of the Elgin Fastener Group. Long length, small diameter headed and threaded industrial fasteners from Ohio Rod.
Tel: 812-689-6565
E-mail: info@ohiorod.com
www.ohiorod.com

Pilot Hole Sizes

Lo-Driv & Tri Round Recommended Pilot Holes Sizes - Inch Screws
Material Thickness Inch Nominal Screw Size
Diameter - TPI
Inch
Approx.
US Gauge Material
.020 - .055
26 - 17
Diameter
.061 - .122
16 - 11
Diameter
.125 - .245
11 - 3
Diameter
.250 - .312
3 - 5/16"
Diameter
.313 - .500
5/16" - 1/2"
Diameter
4 - 40
Steel*
Aluminum**
.098
.098
.102
.100
.104
.102
.
.
6 - 32
Steel
Aluminum
.120
.120
.120
.120
.125
.125
.128
.125
.
8 - 32
Steel
Aluminum
.
.147
.147
.150
.150
.154
.152
.
10 - 24
Steel
Aluminum
.
.166
.166
.172
.166
.177
.170
.
10 - 32
Steel
Aluminum
.
.173
.173
.177
.173
.180
.177
.
12 - 24
Steel
Aluminum
.
.193
.191
.199
.196
.203
.199
.
1/4 - 20
Steel
Aluminum
.
.219
.219
.224
.221
.228
.224

.234
.228

5/16 - 18
Steel
Aluminum
.
.
.281
.278
.288
.284
.290
.286
3/8 - 16
Steel
Aluminum
.
.
.342
.339
.348
.343
.350
.343
Lo-Driv & Tri Round Recommended Pilot Holes Sizes - MetricScrews
Material Thickness Nominal Screw Size Dia. Pitch
Millimeters
Material
.05 - 1.2
Diameter
1.3 - 2.4
Diameter
2.5 - 4.0
Diameter
4.1 - 5.9
Diameter
6.0 - 8.1
Diameter
M3 x 0.5
Steel
2.72
2.74
2.77
.
.
M4 x .07
Steel
3.58
3.60
3.63
3.68
.
M5 x 0.8
Steel
.
4.55
4.57
4.60
4.65
M6 x 1.0
Steel
.
5.41
5.46
5.51
5.54
M7 x 1.0
Steel
.
.
6.45
6.51
6.58
M8 x 1.25
Steel
.
.
7.31
7.39
7.47
M10 x 1.50
Steel
.
.
9.10
9.17

9.27

* Steel: Low carbon sheet and bar; average Rockwell - "B" 55 - 75.
** Aluminum: Aluminum sheet and bar (including aluminum and zinc die castings and all alloys in Rockwell "B" hardness range from 40 - 70) and other ductile materials of similar hardness, such as brass, bronze, etc.

Note: Special materials and applications may warrant special hole sizes. Information available upon request.

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Ohio Rod Products Ohio Rod Products
1415 S. Benham Road, Versailles, IN 47042-0416
Tel. 812-689-6565  •  Fax 812-689-6635
E-mail: info@ohiorod.com
www.ohiorod.com

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