Self-Tapping Cinder Block Screws Hex Washer Head, Blue Ruspert, 3/16" & 1/4" Diameter
[Features]
Self-Tapping Thread Design
- — Cuts its own mating threads directly into cinder block, concrete, brick, and CMU walls; eliminates the need for plastic anchors or expansion sleeves, reducing installation time by up to 40%.
Hi-Lo Dual Thread Geometry
- — Alternating high and low thread profile maximizes holding power in hollow-core cinder blocks while preventing spalling and blowout at the block face. Typical pull-out values exceed 800 lbf in solid concrete (1/4" diameter at 1-1/4" embedment).
Blue Ruspert Corrosion Protection
- — 1,000-hour salt spray rated triple-layer coating (zinc electroplating + chromate passivation + organic topcoat); compliant with ASTM B117 requirements for exterior and humid environment applications.
T25 Torx Drive Recess
- — Six-lobe drive engagement eliminates cam-out and delivers consistent torque transfer during power installation; compatible with standard impact drivers for high-volume jobsite productivity.
Serrated Bearing Surface (Hex Washer Head)
- — Integrated washer face with under-head serrations locks against the fixture surface, preventing vibration-induced loosening in HVAC, electrical, and plumbing applications.
Precision-Cut Lead-in Point
- — CNC-ground chisel point starts engagement in the pilot hole without walking; reduced entry torque compared to standard concrete screw tips.
[Specifications]
|
Parameter |
Specification |
|
Material |
Carbon Steel (1022A), Heat Treated & Case Hardened |
|
Coating / Finish |
Blue Ruspert (Zn + Yellow Chromate + Organic Topcoat) |
|
Alternative Finish |
Zinc Plated (Clear/Blue-White), 410 Stainless Steel |
|
Diameters |
3/16" (#10), 1/4" |
|
Lengths (3/16") |
1-1/4", 1-3/4", 2-1/4", 2-3/4", 3-1/4", 4" |
|
Lengths (1/4") |
1-1/4", 1-3/4", 2-1/4", 2-3/4", 3-1/4", 3-3/4", 4", 5", 6" |
|
Head Style |
Hex Washer Head (HWH), Flat Countersunk Head, Pan Head |
|
Drive Type |
T25 Torx (Ruspert), #2 Phillips / #3 Phillips (Zinc) |
|
Thread Type |
Hi-Lo Alternating, Type-C Self-Tapping |
|
Pilot Hole (3/16") |
5/32" carbide-tipped masonry bit |
|
Pilot Hole (1/4") |
3/16" carbide-tipped masonry bit |
|
Min. Embedment (3/16") |
1" |
|
Min. Embedment (1/4") |
1-1/4" |
|
Pull-Out (3/16", 4,000 PSI Concrete) |
~600 lbf |
|
Pull-Out (1/4", 4,000 PSI Concrete) |
~840 lbf |
|
Salt Spray Rating |
1,000 hours (Ruspert) |
|
Applicable Standards |
ASTM B117, ICC-ES AC193/AC106, ANSI/ASME B18.6.3 |
|
Head Marking |
"F" logo (optional, per batch MOQ) |
|
Packaging |
Bulk carton: 100/250/500 pcs per box; Retail blister card: 10/25/50 pcs |
[Applications]
|
Industry |
Typical Use Cases |
|
Electrical |
Conduit straps, junction boxes, panel boards, cable tray brackets mounted to CMU walls |
|
HVAC |
Duct support brackets, louver frames, condenser unit mounting pads on block walls |
|
Plumbing |
Pipe clamps, hanger brackets, toilet flanges anchored to masonry floors |
|
Framing & Drywall |
Furring strips, metal stud track fastened to block, window and door buck frames |
|
General Construction |
Handrail brackets, exterior lighting fixtures, signage post bases, awning frame mounting |
|
Residential |
Shelving brackets, curtain rod holders, hose reel mounts, security camera brackets on masonry |
|
Precast / Tilt-Up |
Temporary bracing anchors, form tie connections, lifting insert installation |
[Why choose Fasto?]
