Package Quantity: 500 per box
Price: $265.81
Item #OMG-CRHD7B
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Description
The OMG CRHD7B is a 7-inch heavy duty roofing fastener in the #14 series designed to secure insulation and membranes to steel, wood, and concrete decks. It features a deep thread geometry and a sharp 30° spade point for fast penetration. The fastener is coated with OMG’s CR-10 corrosion resistant finish and is Factory Mutual and Miami-Dade approved.
Key Features:
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Deep thread profile for high pull-out resistance in roofing substrates
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30° spade point enables swift penetration into steel, wood, or concrete
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CR-10 corrosion resistant coating meets FM 4470 and limits red rust formation
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#3 Phillips truss head allows use with standard screw guns
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7-inch length accommodates thicker insulation plus substrate
Specifications
- SKU / Model: CRHD7B
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Thread diameter: 0.245 in (6.22 mm)
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Shank diameter: 0.190 in (4.82 mm)
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Head diameter: 0.435 in (11.04 mm) truss Phillips #3
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Thread pitch: 10 threads per inch
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Point type: 30° spade point
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Coating: CR-10 corrosion resistant coating, passes FM 4470 / EAD 030351-00-0402 requirements (standard for OMG Heavy Duty #14 series)
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Length: 7 in (175 mm)
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Threaded length: 4 in (102 mm)
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Minimum embedment (steel decks): ¾ in (20 mm)
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Minimum embedment (wood decks): 1 in (25 mm)
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Minimum embedment (concrete decks): 1 in (25 mm)
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Pilot hole size: 3⁄16 in (5 mm), drilled at least ½ in (13 mm) deeper than embedment
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Weight per box: approximately 30 lbs (13.60 kg)
How To
- Determine the required fastener length by adding insulation thickness, membrane thickness (if used) and required minimum embedment into the structural deck.
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Drill a pilot hole of 3⁄16 inch (5 mm) depth at least ½ inch (13 mm) deeper than the embedment depth.
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Place the fastener so its head lies flush with the insulation or membrane surface.
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Drive the fastener using a screw gun with a #3 Phillips bit, stopping when a slight depression appears around the plate. Do not overdrive.
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Ensure that if plates, insulation boards or membranes are in use, they lie flat and stable before final drive.
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Conduct pull tests periodically to confirm anchorage performance and verify substrate suitability.
FAQs
Q: What coating does CRHD7B use and why?
A: It uses OMG’s CR-10 corrosion resistant coating, which is designed to meet FM 4470 and industry corrosion standards and minimize red rust formation.
Q: In what substrates can CRHD7B be used?
A: It can be used in steel decks, wood decks, and structural concrete (with proper pilot drilling and embedment).
Q: How many fasteners are packaged per box?
A: 500 per box.
Q: What pilot hole is needed for CRHD7B?
A: A 3⁄16 inch (5 mm) pilot hole should be drilled at least ½ inch (13 mm) deeper than the embedment depth.
Q: Should pull tests be performed with CRHD7B?
A: Yes, pull tests are recommended to validate the substrate condition and anchorage performance.
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