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TECHNICAL BULLETIN
PLATED STEEL SELF-TAPPING FASTENERS
Type of Fastener
A, AB, B, Number 14 Diameter
Type of Material
Fasteners are to be made from a good quality cold heading wire of 1018 designation. Screws
to be heat treated to a Rockwell Hardness of C-38 Minimum.
Type of Plating
X-Tend finish provides two layers of protection. The top seal is an effective
barrier to the environmental elements present. While the zinc layer
affords a secondary layer for even further protection. These two layers work
together to provide an exceptionally corrosion resistant coating.
Tool Selection
An electric screwgun with a variable speed of 0-2000 RPM is the suggested tool.
Recommend Usage
Type B to be used for sheet to structure. Type AB for sheet to light gauge purlins or
laps. Type A lap only.
PERFORMANCE TESTS
Test Results
Strength of Fastener
| |
1/4" Type B |
#14 Type A & AB |
| Minimum tensile strength |
3,900 lbs. |
3,825 lbs. |
| Minimum shear strength |
2,625 lbs. |
2,475 lbs. |
| Minimum torsional strength |
150 inch lbs. |
140 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.
Average Pull Out Values in Lbs.
Thickness
of Steel |
Hardness of
Steel Rockwell |
Drilled
Hole Size |
1/4" Type B |
#14 Type AB |
#14 Type A |
| 20 gauge |
50 |
3/16" |
|
|
511 |
| 18 gauge |
60 |
3/16" |
896 |
677 |
666 |
| 16 gauge |
64 |
#8 |
1211 |
1168 |
1043 |
| 14 gauge |
64 |
#8 |
1373 |
1494 |
1485 |
| 12 gauge |
64 |
#7 |
2526 |
1758 |
|
| 1/4" gauge |
60 |
#1 |
3566 |
|
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Test Results
Pull Over Tests
To determine the tension required to pull steel over fastener head.
Thickness
of Steel |
Hardness of
Steel Rockwell B |
Drilled
Hole Size |
Washer
Diameter |
Average Pull Over
in Lbs. |
| 20 gauge |
56 |
3/16" |
15mm Glav. |
1408 |
| 22 gauge |
52 |
3/16" |
15mm Galv. |
1211 |
| 24 gauge |
50 |
3/16" |
15mm Galv. |
896 |
| 26 gauge |
49 |
1/8" |
15mm Galv. |
612 |
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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