Concrete Flat Head Screw
Caliburn screws are professionally engineered fasteners for concrete and similar applications. They feature a patented thread design for ease of driving the screw. They are available in different head designs for multiple applications with the recommended GRK Drill Bits. Both Caliburn and Caliburn XL are Climatek coated for high corrosion resistance.
Features:
Star Drive Recess
Complete and Effective Installation
Case Hardened Steel
To Use:
Pre-drill pilot hole with 3/16 Concrete Drill Bit for Caliburn screws or 1/4 GRK Concrete Drill Bit for Caliburn XL screws.
Clear concrete dust from hole.
Drive the screw with GRK #25 bit for Caliburn� screws or #40 bit for Caliburn XL screws.
DRILL BIT INCLUDED IN BOX
TECHNICAL DATA |
Screw Size | Embed. Depth (in) | 2000 psi Concrete | Bit Size | Drill Size |
Tension Pullout (lbs) | Shear (lbs) (in) |
1/4 x 1 3/4 | 1 1/2 | 1655 | 1505 | T25 | 3/16 |
1/4 x 2 1/4 | 2 | 2120 | 2055 | T25 | 3/16 |
19/64 x 2 3/4 | 2 1/2 | 2209 | 3135 | T40 | 1/4 |
19/64 x 3 1/2 | 3 1/4 | 2523 | 3200 | T40 | 1/4 |
19/64 x 5 | 4 3/4 | 5724 | 3300 | T40 | 1/4 |
NOTE:
- All values are based on close tolerance holes drilled a minimum of 1/4" deeper than embedment depth, using GRK drill bits.
- All listed values shown at left are average pullout and shear values for GRK's Caliburn� and Caliburn� XL screws. Values will vary depending on a number of factors, including the quality of the concrete and size of the drill hole.
- These figures are only offered as a guide, are not guaranteed by GRK and not reduced by any safety factor.
- For safety factor requirements in your area, contact your local building official architect or engineer. Testing was performed according to ASTM standard E-488-96. For specific calculations refer to ACI #318 Appendix D