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

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.

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.

Washer Seating Recommendation

Head Styles Available

Head Drive Systems

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.