GB78 - 45H (Carbon Steel) - Grade B, Grade A - Grade 12.9 - Black Oxide
Product Details
Product Name: Yongjing Grade 12.9 Hexagon Socket Cone Point Set Screw
Technical Standard: GB78
Product Grade: Grade B, Grade A (Optional)
Performance Grade: Grade 12.9
Material: 45H (Medium Carbon Steel)
Surface Treatment: Black Oxide
Product Type: Hexagon Socket Cone Point (Sharp Point)
Product Description
Product Overview
This product is a hexagon socket cone point (sharp point) set screw complying with GB78 standard, manufactured from 45H (medium carbon steel) material and heat-treated to achieve ultra-high strength of Grade 12.9, with black oxide surface treatment. Its sharp conical tip can be effectively embedded into the surface of the fastened part, providing extremely strong anti-vibration and anti-loosening capabilities. Two tolerance grades are available: Grade B (general) and Grade A (precision), to meet the high-strength locking needs of different precision assembly scenarios.
Core Advantages
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Top-Level Locking Strength: Ultra-high strength of Grade 12.9 provides extremely high locking force and shear resistance.
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Excellent Anti-Loosening Performance: The sharp cone tip can be embedded into the material to form mechanical locking, with excellent anti-vibration and anti-loosening effects.
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Dual Precision Grades Available: Grade A (high precision) and Grade B (general precision) are provided to adapt to different assembly requirements.
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Surface Protection and Friction Reduction: Black oxide treatment provides basic rust resistance and a certain friction reduction effect.
Applicable Industries
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Heavy and Construction Machinery: Locking and positioning of key components in high-vibration environments such as excavators, cranes, and mining equipment.
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Mold Manufacturing and Stamping: Fastening and anti-rotation of high-load precision components such as mold cores and inserts in stamping molds and plastic molds.
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Power Transmission Systems: Axial fixation of high-torque transmission components such as high-power gearboxes, transmissions, and engine flywheels.
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Automotive Key Components: Locking and adjustment of safety-critical parts such as automotive chassis suspension, steering systems, and drive shafts.
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Rail Transit Equipment: Structural fastening and anti-loosening of relevant accessories for locomotive running gear and heavy rail equipment.
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High-End Hydraulic Equipment: Fixation of components bearing high pressure and pulsating loads in equipment such as high-pressure cylinders, hydraulic pumps, and valves.
Warm Tips
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The cone point design is intended to be embedded into the surface of the fastened part. It is recommended to process a pilot hole or dimple at the corresponding position to achieve the best effect and prevent slipping.
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Please select Grade A (precision) or Grade B (general) products according to the assembly accuracy requirements, and use a torque wrench to tighten to the specified torque.
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The black oxide layer has limited corrosion resistance and is mainly suitable for dry or indoor environments. If used in humid or corrosive environments, additional protective measures must be taken.
