Corrugated Metal
Fasteners
Available in Zinc coated and stainless steel, types 304-316, & 410. Please call with your specific requirements for placing an order. Mechanical Metals, Inc, 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 |
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| 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 |
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| #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 |
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| 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 |
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| 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.