Knurled Hex Socket Head Cap Metal Screw With A Hole M8 M9 M10 Black Zinc Plated Galvanized Carbon Steel
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Knurled Hex Socket Head Cap Metal Screw With A Hole M8 M9 M10 Black Zinc Plated Galvanized Carbon Steel Product Description This hex socket head cap screw combines knurling under the head and a transverse hole through the head. The knurling aids hand starting, while the hole allows safety wire or cotter pin insertion for positive mechanical locking against loosening. Material: carbon steel with black zinc plating (black passivated zinc). Strength class typically 8.8 or 10.9. Sizes M8, M9, M10 suit medium-duty industrial connections. The drilled hole design is essential in high-vibration environments such as engine peripherals, railway equipment, and mining machinery. Black zinc provides a uniform dark finish and moderate corrosion protection. Applications
Construction machinery engine mounts – safety wire through hole prevents loosening. Mining vibrating screens – transverse hole with cotter pin. Railway vehicle bogie access covers – double security against vibration. Large fan rotor locking rings – wire-locked drilled screws. Agricultural harvester blade holders – black zinc resists mud and wear. Key Features Dual function: knurling + hole – hand starting convenience plus wire-locking anti-loosening. Black zinc finish – dark, non-reflective appearance. Medium diameters M8-M10 – common for moderate loads. Positive mechanical locking – safety wire outperforms spring washers. High-strength carbon steel – Grade 10.9 for high preload. Company Information Frequently Asked Questions Q: Are you trading company or manufacturer? A: We are factory and OEM are available. Q: How long is your delivery time? A: Generally 7-10 days if in stock, or 15-20 days if not in stock
(depending on quantity). Q: Do you provide samples? Is it free or extra? A: Yes, we offer free samples but customers pay the freight cost. Q: What are your payment terms? A: 30% T/T in advance, balance before shipment or L/C. |
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| Product Tags: knurled hex socket cap screw black zinc plated metal screw galvanized carbon steel screw |
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Knurled Hex Socket Head Cap Metal Screw With A Hole M8 M9 M10 Black Zinc Plated Galvanized Carbon Steel |
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