Use and Care Manual

328
Copyright © 2020 MiTek Industries, Inc. All Rights Reserved
Cold-Formed Steel Connectors
CFS Connectors
MiTek
®
Product Catalog
MiTek recommends the use of hex head metal screws with a self-drilling tip,
for ease of installation and strength. Screw diameter ranges from 0.190" to
0.250" and is specied for each connector in their corresponding load table.
An important factor to consider when selecting a self-drilling screw is
the material thickness specically the combined side and main member
thickness. Care should be taken by the designer to verify that the drill point
and thread length are long enough to appropriately fasten the members
per the fasteners manufacturers specications.
The drill point is the unthreaded section from the screw tip to the rst thread.
This length must be long enough to completely drill through the material
before the threads engage. If the threads engage too early, they can cause
the fastener to bind and break.
Specication Table
Screw Identication Table
33─33 43─43 54─54 68─68 97─97 33 43 54 68 97
(20─20) (18─18) (16─16) (14─14) (12─12) (20) (18) (16) (14) (12)
#10 x 1/2" 0.190 0.375 573 188 289 404 564 573 885 87 116 145 182 254
#12 x 3/4" 0.216 0.375 724 200 308 430 601 724 1184 99 132 165 207 289
#14 x 3/4" 0.250 0.500 990 215 331 463 647 990 1605 115 153 191 239 335
1) Allowable loads are per AISI S-100 and are for use when utilizing the traditional Allowable Stress Design methodology. The tabulated loads may
be multiplied by a Factor of Safety (Ω) of 3 to determine the screw nominal strength. The LRFD load may be determined by multiplying the allowable
screw load by the ASD safety factor of 3 then by Resistance Factor (φ) of 0.50.
2) Allowable loads may not be increased for wind or seismic load unless otherwise noted.
3) Allowable loads are based on cold-formed steel members with a minimum yield strength, Fy, of 33 ksi and tensile strength, with an Fu, of 45 ksi.
4) Allowable loads are based on design steel thickness for 33 mil = 0.036", 43 mil = 0.048", 54 mil = 0.060", 68 mil = 0.075",
and 97 mil = 0.105" per ITW Buildex ESR-1976.
5) Self-drilling tapping screw fasteners for steel-to-steel connections used for connectors in this catalog shall be in compliance with ASTM C1513.
6) Screw diameters used in the calculation of shear loads per ANSI/ASME standard.
Allowable
Screw
Tension
Strength
(P
ts
/Ω)
Allowable Tensile Pull-Out Strength
(P
not
/Ω, P
ts
/Ω)
Steel Thickness
mil (gauge)
Screw Size
Nominal
Diameter
d
(in)
Washer
Diameter
d
w
(in)
Allowable
Screw
Shear
Strength
(P
ss
/Ω)
Allowable Shear Connection Strength
(P
ns
/Ω, P
ss
/Ω)
Steel Thickness
mil (gauge)
Fastening Information
#10 x 1/2" #12 x 3/4" #14 x 3/4"
(in) (mm)
#10 0.095 2.41
#12 0.095 2.41
#14 0.095 2.41
#10 0.175 4.45
#12 0.210 5.33
#14 0.210 5.33
TEKS/4 #12 0.250 6.35
TEKS/4.5 #14 0.375 9.53
#12 0.500 12.70
#14 0.500 12.70
1) Total thickness of all steel, including any spacing
between steel layers.
2) Drill and tap capacities may vary.
3) Table is guideline only; see individual product for
specific maximum material thickness.
TEKS/5
Maximum Material Thickness
1,2
Screw Point
Type
Screw
Size
TEKS/1
TEKS/3