Metal Fasteners

Available in Zinc coated and stainless steel, types 304-316, & 410. Please call with your specific requirements for placing an order. Corrugated Metal will be happy to help in choosing the correct fasteners for your specific needs.

Decimal (inch) Equivalents
of Thread Diameters
Decimal (inch) Equivalents
of Sheet Metal Gauges
Thread Diameter Decimal Equivalent Gauge Thickness (in.)
#6 .140 26 .018
#7 .150 24 .024
#8 .160 22 .030
#9 .180 20 .036
#10 .190 18 .048
#11 .200 16 .060
#12 .210 14 .075
#13 .230 12 .105
1/4" .240 10 .134
#14 .250 8 .164
#17 .285 4 .224
#18 .304 1/4 .250
11/32" .344

Fastener Size Washer O.D.
#8 thru #10 1/2"
#12 thru 1/4" 15mm
#18 15mm

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Recommended Driving Speed
Drilling Fasteners Electric Screw Gun with
depth sensing nose piece
#6 thru #10 2,500 RPM max
#12 thru #18 2,000 RPM max
Self-Tapping Fasteners
Carbon & 410 Stainless 2,000 RPM max
300 Stainless 800 RPM max

Metal to Metal Fastening to Determine Drilling Tip Length

The length of the tip required on a drilling fastener is determined by adding up the thickness of the top material, any insulation or void between the top material and bottom meterial, and the thickness of the bottom material. If a hole larger than the screw thread has been pre-drilled or punched into the top material, only the thickness of the bottom material need be considered. The threaded portion of the shank must be long enough to extend into and through the bottom material drilled.

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Socket Information

Recommend 5/16" retaining ring socket, which allows good fastener head engagement into socket and keeps fastener perpendicular to the work surface. If magnetic sockets are used, be sure to set magnet depth prior to use. Magnetic sockets usually become worn which causes the fastener to wobble and "walk" on sheets.

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Washer Seating Recommendation

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Head Styles Available

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Head Drive Systems

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Fastener Selection
to Minimize Galvanic Action (Corrosion) Between Fastener and Base Metal
Fastener Metal
Base Metal Zinc &
Galvanized
Steel
Aluminum &
Aluminum
Alloys
Steel &
Cast Iron
Brasses,
Copper,
Bronze,
Monel
Martensitic
Stainless
410
Austenitic
Stainless
302/304, 303,
305
Zinc &
Galvanized
Steel
A B B C C C
Aluminum &
Aluminum
Alloys
A A B C * B
Steel &
Cast Iron
AD A A C C B
Terne
(Lead-Tin)
Plated Sheet
ADE AE AE C C B
Brass,
Copper,
Bronze,
Monel
ADE AE AE A A B
Ferritic
Stainless
Steel (430)
ADE AE AE A A A
Austenitic
Stainless
Steel(302/304)
ADE AE AE AE A A

KEY

A – corrosion of the base metal is not increased by the fastener
B – corrosion of the base metal is marginally increased by the fastener
C – corrosion of the base metal may be markedly increased by the fastener
D – plating on the fastener is rapidly consumed, leaving the bare fastener metal
E – corrosion of the fastener is increased by the base metal
NR – not recommended
NOTE: Surface treatment and environment can change activity.

* – Commonly used in the metal building industry

Fastener Selection Chart and Suggested Drill Sizes
#14 Type A 1/4" Type B & BP 1/4" Type AB #17 Type AB
Steel Gauge Hole Size Steel Gauge Hole Size Steel Gauge Hole Size Steel Gauge Hole Size
#26 1/8" 3/16" – 3/8" #2 Bit #26 1/8" #26 3/16"
#24 5/32" 3/8" & over #1 Bit #24 5/32" #24 3/16"
#22 5/32" #22 5/32" #22 3/16"
#20 5/32" #20 5/32" #20 1/4"
#18 3/16" #18 3/16" #18 1/4"
#16 3/16" #16 3/16" #16 1/4"
#14 #7 Bit #14 #7 Bit #14 1/4"
#12 #7 Bit #12 17/64"
1/8" #2 Bit #10 16/64"
#10 #2 Bit

All test results and recommendations are based on laboratory tests. Hole sizes for material thicker than 14 gauge are based on 50,000 psi hot rolled structural steel. Specific job site conditions should be taken into consideration when specifying the proper fastener. Because applications vary, we assume no liability for use of this information.