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TECHNICAL BULLETIN
NO. 10 "DUAL-GRIP"
Type of Fasteners
Self-drilling piercing point with shank slot. Number 10 Diameter.
Type of Material
Fasteners are to be made from a good quality cold heading wire of 1018 designation.
Screws to be heat treated after cold forming to produce a Rockwell Hardness of C-38
minimum.
Tool Selection
An electric screwgun with a variable speed of 0-2000 RPM is the suggested
tool.
Recommended Usage
Fastener to be used for attachment of light gauge sheeting to wood. No pre-drilling
of material is necessary. Maximum panel thickness is .050 inches. Minimum
suggested embedment in wood is 7/8".
PERFORMANCE TEST
Test Results
Strength of Fastener
| Minimum tensile strength |
1,825 lbs. |
| Minimum shear strength |
965 lbs. |
| minimum torsional strength |
60 inch lbs. |
(These are conservative values) |
Test Results
Pull Out Tests
To determine the tension required to remove properly drilled screws out
of steel member.
Wood Type |
Average Pull Out in Lbs.
Embedment in Wood 1" |
| Pine |
384 |
| Treated Pine |
514 |
| Poplar |
506 |
| Spruce |
579 |
| Cedar |
666 |
| Oak |
1219 |
The test results shown are believed to be reliable.
However, variances in testing and actual field
conditions may alter the results. There is no
expressed or implied warranty on the test Data.
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