Head Type: Hex
Screw Features: Flanged
Locking Type: Serrations
Drive Style: External Hex
Thread Type: UNC
Thread Direction: Right Hand
Threading: Fully Threaded
Thread Spacing: Coarse
Fastener Strength: Grade 8
Material: Zinc Yellow-Chromate Plated Steel
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About 20% stronger than medium-strength steel screws, these Grade 8 steel screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. Serrations under the head grip the material surface for mild vibration resistance, and the flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. Material meets SAE J429 specifications for quality. Dimensions meet IFI 111 specifications. Grade 8 steel hex head screws are marked with six radial lines. Head height includes the flange. Length is measured from under the flange.
Finish
Black-phosphate steel screws are mildly corrosion resistant in dry environments.
Zinc-plated and zinc yellow-chromate plated steel screws are corrosion resistant in wet environments.
