UNC/UNF Head Perforated Lead Sealed Hex Screw 12.9 Grade Imperial Cup Head US Fastener

Regular price $5.06 USD

Regular price ~~$5.06 USD~~ Sale price $5.06 USD

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Color classification 2 #-56 * 1/8 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 5/32 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 3/16 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 1/4 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 5/16 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 3/8 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 7/16 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 1/2 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 5/8 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 3/4 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 7/8 (10pcs) side hole 1.0Variant sold out or unavailable 2 #-56 * 1 (10pcs) side hole 1.0Variant sold out or unavailable 3 #-48 * 1/8 (10pcs) side hole 1.0Variant sold out or unavailable 3 #-48 * 5/32 (10pcs) side hole 1.0Variant sold out or unavailable 3 #-48 * 3/16 (10pcs) side hole 1.0Variant sold out 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12.9 Grade Imperial Cup Head Perforated Lead Sealed Hex Screw Product Description (Shopify & Google SEO-Optimized)

Elevate your industrial fastening security with our 12.9 Grade Imperial Cup Head Perforated Lead Sealed Hex Screws—engineered for high-torque, tamper-resistant applications that demand uncompromising strength and compliance with UNC/UNF thread standards. Crafted from premium alloy steel and heat-treated to achieve 12.9 grade tensile strength, these US-standard hex screws deliver exceptional shear resistance and load-bearing capacity, making them ideal for heavy machinery, construction equipment, pipeline systems, and high-security industrial installations where unauthorized disassembly is a critical concern.

Core Features & Benefits

12.9 Grade High-Strength Alloy Steel Construction

Forged from top-grade alloy steel and processed through rigorous heat treatment, these screws meet the strict 12.9 strength rating—outperforming ordinary carbon steel fasteners by withstanding extreme torque, vibration, and heavy loads without deformation or breakage. Perfect for heavy-duty scenarios like mining machinery, hydraulic systems, and structural steel assembly.
Head Perforated & Lead Sealed Tamper-Resistant Design

The unique cup head perforation allows for easy lead sealing after installation, creating a tamper-proof barrier that prevents unauthorized loosening or removal. This design is essential for applications requiring compliance with safety regulations, such as public infrastructure, transportation equipment, and industrial machinery with strict maintenance protocols.
UNC/UNF Imperial Thread Compatibility

Available in both UNC (Unified Coarse) and UNF (Unified Fine) imperial thread standards, these hex screws seamlessly match US-standard tapped holes and nuts. Whether you need coarse threads for quick assembly or fine threads for precise load distribution, they adapt to diverse industrial workflows with universal compatibility.
Precision-Machined Cup Head for Tool Stability

The smooth, precision-machined imperial cup head and hex drive ensure slip-free installation with standard hex key tools, eliminating the risk of tool slippage and workpiece damage during assembly. The streamlined head design also reduces protrusion, making it suitable for applications with limited space.
Corrosion-Resistant Finish for Longevity

Coated with a durable anti-rust layer, these screws offer reliable protection against mild humidity, oil, and industrial debris in workshop, outdoor, and underground environments. The corrosion-resistant finish extends service life, minimizes maintenance costs, and ensures consistent performance even in harsh working conditions.

Specifications

Strength Grade: 12.9 Grade Alloy Steel
Thread Standard: UNC/UNF (Imperial/US Standard)
Design: Cup Head, Head Perforated, Lead Sealed
Drive Type: Hex Socket
Applications: Heavy machinery, pipeline systems, construction equipment, high-security installations, transportation hardware

Why Choose Our Screws?

We prioritize precision and durability in every fastener we produce. Each 12.9 grade hex screw undergoes strict dimensional and performance testing to meet international industrial standards, ensuring reliable, long-lasting performance for your critical projects. Whether you’re a professional engineer, factory manager, or procurement specialist, our tamper-resistant lead sealed screws provide the security and strength you need to keep operations running smoothly.

Warm Tip: Please confirm your required thread type (UNC/UNF) and length before purchase to ensure perfect compatibility with your project.