Selection Guide

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Complete Selection Guide

Climatek™ coated screws have been independently tested and approved for use in treated wood products.  Our fasteners come with a limited Lifetime Warranty.  For best performance use PHEinox™ stainless steel screws by GRK.

Always build your project according to current ICC (International Code Council) specifications.  GRK’s Climatek™ coating conforms with ICC-NES Report #NER-643, ICC-NES Report #NER-628 and ICC-NES Report #NER-669 which allows for use of triple zinc polymer coated fasteners in contact with ACQ treated woods.

Pressure Treated Lumber Decking:
Use #9 or #10 gauge R4™ on deck boards.  For Southern Yellow Pine use #10. For best performance use PHEinox™ stainless steel screws by GRK.

Cedar & Redwood Decking:
Use #9 or #10 gauge GRK R4™ to lock wood in place. Countersink screws by 1/8" and seal wood immediately with a quality sealer to lessen the likelihood of tanic acid stains. For best performance use PHEinox™ stainless steel screws by GRK.

Tropical Wood Decking: (e.g. Mahogany, Ipe, etc.)
Use PHEinox™ stainless steel screws by GRK. Due to movements of these woods many importers recommend pre-drilling.

Composite & Plastic Decking:
For best performance use PHEinox™ RT Composite™ stainless steel screws by GRK.

Ledger Boards & Structural Parts:
Use RSS™ Structural Screws by GRK as a lag screw alternative to get exceptional strength.

Concrete & Masonry:
Use Caliburn™ Screws by GRK.

Pools, Hot Tubs, Saunas:
Use only PHEinox™ stainless steel screws by GRK.

No pre-drilling for R4™, RSS™, Cabinet™ and Trim™ Head screws
except where wood limitations require.
Always place deck boards with outer edge of growth rings facing up
(bark side up).
DO NOT use deck cleaners which contain bleach with coated metals.
Always consult wood supplier's / manufacturer's recommendations.
Decking screws should be countersunk 1/8".

Technical Data

RSS™ Structural Screw Test Data

GRK Fasteners utilizes strict quality control procedures. Every batch of screws produced is independently random sampled and quality controlled to the highest standards.

Accreditations for independent test laboratories include:
ICC, CNLA, TÜV, Ü, ISO, DAR.

Tests conducted in Douglas Fir specific gravity 0.5.

Pull Out Test Results for RSS™ Structural Screws     Size Sidegrain: Endgrain: 5/16 x 2"1/2 1740 lbs 1223 lbs 5/16 x 3"1/8 2054 lbs 2321 lbs 5/16 x 4" 2644 lbs 2565 lbs 5/16 x 5"1/8 2745 lbs 2829 lbs 5/16 x 6" 3619 lbs 3522 lbs 3/8  x 7"1/4 3962 lbs 3920 lbs 3/8  x 8" 4364 lbs 4661 lbs 3/8  x 10" 4840 lbs 5104 lbs 3/8  x 12" 5258 lbs 5044 lbs 3/8  x 14"1/8 5306 lbs 5172 lbs 3/8  x 16" 5990 lbs 5753 lbs	Shear Strength Test Results for RSS™ Structural Screws Size Shear Values 5/16 x 2"1/2 829 lbs 5/16 x 3"1/8 847 lbs 5/16 x 4" 1328 lbs 5/16 x 5"1/8 1331 lbs 5/16 x 6" 1335 lbs 3/8  x 7"1/4 1282 lbs 3/8  x 8" 1386 lbs 3/8  x 10" 1504 lbs 3/8  x 12" 1900 lbs 3/8  x 14"1/8 1958 lbs 3/8  x 16" 2065 lbs
Head Pull Through Test Results for RSS™ Structural Screws.  5/16" screws avg. 825 lbs Shaft Diameter 0.198" Head Diameter 0.616" 3/8" screws avg. 889 lbs Shaft Diameter 0.220" Head Diameter 0.711"	Shear Test Result for R4™ Multipurpose Screws Diameter Avg. Ultimate Load (lbs) Wood Failure Rate #4 139 50% #6 301 70% #8 361 30% #9 452 65% #10 687 75% #12 720 75%
Minimum Tensile Strength GRK Spec: 139,000 PSI Code Spec: 45,000 PSI	Minimum Bending Angle GRK Spec: 35° Code Spec: 15°
Bending Yield Moment Test for RSS™ Structural Screws 5/16": 159,073 PSI 3/8": 177,241 PSI	GRK Certifications include: ISO 9001 ICC Ü – German Institute for Building Technology
Test stopped after wood failure or 1/8" screw displacement.
All tests were conducted at independent laboratories in the United States, Germany and Taiwan. Tests were conducted in accordance with ASTM and/or DIN norms. Testing is ongoing and is conducted on every production series. All posted results are Average Ultimate Load Values. For construction design purposes an applicable safety margin should be applied. An architect or engineer should be consulted for this.

R4™ Multi Purpose Screw Test Data

R4™ Shear Test Results
Diameter	Avg. Ultimate Load (lbs)	Wood Failure Rate
#4	139	50%
#6	301	70%
#8	361	30%
#9	452	65%
#10	687	75%
#12	720	75%

• Test ASTM D 1761 Lateral Resistance/Slip, Wood to Wood connection.
• Testing stopped when screw displaced 1/8" or upon wood failure. Wood failed in majority of tests prior to screw failure. Test conducted in wood with specific gravity 0.42.
• Please note, the above stated values are ultimate loads. For construction design purposes an applicable safety margin should be applied. An architect or engineer should be consulted for this.

Caliburn™ Concrete Screw Test Data

TECHNICAL DATA - Caliburn™
Screw Size	Embed. Depth	2000 psi Concrete		Bit Size	Drill Size
		Tension Pullout lbs/in	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™, Caliburn™ PH 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

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