High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws

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High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws

High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws are engineered for critical applications requiring maximum tensile strength and fatigue resistance. Manufactured from premium alloy steel and heat-treated to meet rigorous Grade 8 or Class 10.9/12.9 standards, these fasteners provide exceptional clamping force and structural integrity. Ideal for heavy machinery, automotive suspension, and high-stress industrial environments, they ensure long-term reliability where failure is not an option.

Part Number Thread Size Length Threading Specifications Met Thread Type Head Diameter Head Height Material Tensile Strength Hardness
0278FA00020 1/4"-20 1/2" Fully Threaded IFI 111 UNC - 9/32" Black-Phosphate Steel 150000 psi Rockwell C33
0278FA00001 1/4"-20 1/2" Fully Threaded IFI 111 UNC - 9/32" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00002 1/4"-20 3/4" Fully Threaded IFI 111 UNC - 9/32" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00023 1/4"-20 1" Fully Threaded IFI 111 UNC - 9/32" Zinc Yellow-Chromate Plated Steel 150000 psi Rockwell C33
0278FA00003 1/4"-20 1" Fully Threaded IFI 111 UNC - 9/32" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00004 1/4"-20 1 1/4" Fully Threaded IFI 111 UNC - 9/32" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00005 1/4"-20 1 1/2" Fully Threaded IFI 111 UNC - 9/32" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00026 5/16"-18 1/2" Fully Threaded IFI 111 UNC - 21/64" Zinc Yellow-Chromate Plated Steel 150000 psi Rockwell C33
0278FA00006 5/16"-18 1/2" Fully Threaded IFI 111 UNC - 21/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00027 5/16"-18 3/4" Fully Threaded IFI 111 UNC - 21/64" Zinc Yellow-Chromate Plated Steel 150000 psi Rockwell C33
0278FA00007 5/16"-18 3/4" Fully Threaded IFI 111 UNC - 21/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00021 5/16"-18 1" Fully Threaded IFI 111 UNC - 21/64" Zinc Yellow-Chromate Plated Steel 150000 psi Rockwell C33
0278FA00008 5/16"-18 1" Fully Threaded IFI 111 UNC - 21/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00009 5/16"-18 1 1/4" Fully Threaded IFI 111 UNC - 21/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00010 5/16"-18 1 1/2" Fully Threaded IFI 111 UNC - 21/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00011 5/16"-18 1 3/4" Fully Threaded IFI 111 UNC - 21/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00012 5/16"-18 2" Fully Threaded IFI 111 UNC - 21/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00013 3/8"-16 3/4" Fully Threaded IFI 111 UNC - 25/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00014 3/8"-16 7/8" Fully Threaded IFI 111 UNC - 25/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00022 3/8"-16 1" Fully Threaded IFI 111 UNC - 25/64" Zinc Yellow-Chromate Plated Steel 150000 psi Rockwell C33
0278FA00015 3/8"-16 1" Fully Threaded IFI 111 UNC - 25/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00025 3/8"-16 1 1/4" Fully Threaded IFI 111 UNC - 25/64" Zinc Yellow-Chromate Plated Steel 150000 psi Rockwell C33
0278FA00016 3/8"-16 1 1/4" Fully Threaded IFI 111 UNC - 25/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00024 3/8"-16 1 1/2" Fully Threaded IFI 111 UNC - 25/64" Zinc Yellow-Chromate Plated Steel 150000 psi Rockwell C33
0278FA00017 3/8"-16 1 1/2" Fully Threaded IFI 111 UNC - 25/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00018 3/8"-16 1 3/4" Fully Threaded IFI 111 UNC - 25/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00019 3/8"-16 2" Fully Threaded IFI 111 UNC - 25/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00028 1/2"-13 1" Fully Threaded IFI 111 UNC - 33/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00029 1/2"-13 1 1/4" Fully Threaded IFI 111 UNC - 33/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00030 1/2"-13 1 1/2" Fully Threaded IFI 111 UNC - 33/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00031 1/2"-13 1 3/4" Fully Threaded IFI 111 UNC - 33/64" Zinc-Plated Steel 150000 psi Rockwell C33
0278FA00032 1/2"-13 2" Fully Threaded IFI 111 UNC - 33/64" Zinc-Plated Steel 150000 psi Rockwell C33
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