10.9 Grade UNC/UNF/BWS American Round Head Plum Blossom Slot Screw Product Description (Shopify & Google SEO-Optimized)

Elevate your industrial and hardware assembly projects with our 10.9 Grade UNC/UNF/BWS American Round Head Plum Blossom Slot Screws—precision-engineered imperial fasteners designed for reliable, high-torque performance across diverse applications. Available in yuan cup, round cup, and mushroom head profiles, these machine screws adhere to American thread standards, delivering a seamless fit for US-spec tapped holes and components in machinery, electronics, automotive, and construction workflows.

Core Features & Benefits

10.9 Grade High-Strength Alloy Steel Construction

Forged from premium alloy steel and heat-treated to meet the 10.9 strength rating, these screws boast exceptional shear resistance and load-bearing capacity. They withstand heavy vibration, high torque, and extreme working conditions, outperforming standard carbon steel fasteners for long-lasting durability in critical assemblies.
Multi-Thread Standard Compatibility (UNC/UNF/BWS)

Compliant with three key American thread standards—UNC (Unified Coarse), UNF (Unified Fine), and BWS (British Whitworth Standard, adapted for US use)—these screws offer versatile compatibility for different project needs. Coarse threads suit quick, secure fastening, while fine threads deliver precise load distribution for precision equipment and automotive parts.
American Round Head Plum Blossom Slot Design

The precision-machined plum blossom slot (torx-compatible) prevents tool slippage during installation, reducing the risk of stripped heads and workpiece damage. Paired with the classic American round head, yuan cup, and mushroom head profiles, the screws provide low-profile or enhanced bearing surface options, adapting to limited-space or high-stability assembly requirements.
Imperial Sizing for US-Standard Applications

Tailored to imperial measurements, these machine screws are the perfect match for American-made machinery, electronic enclosures, furniture hardware, and automotive components. Their exact dimensional accuracy ensures a tight, wobble-free fit, eliminating the hassle of mismatched metric and imperial fasteners in cross-border projects.
Corrosion-Resistant Finish for Extended Service Life

Coated with a durable anti-rust and anti-corrosion layer, these screws resist moisture, oil, and industrial debris in workshop, outdoor, and underhood environments. The protective finish minimizes maintenance costs and extends service life, making them ideal for both indoor and outdoor installations.

Specifications

Strength Grade: 10.9 Grade Alloy Steel
Thread Standards: UNC/UNF/BWS (American/Imperial)
Head Types: American Round Head, Yuan Cup, Round Cup, Mushroom Head
Drive Type: Plum Blossom Slot (Torx-Compatible)
Applications: Machinery assembly, electronics, automotive parts, construction hardware, furniture installation

Why Choose Our Screws?

Every screw undergoes strict dimensional and performance testing to meet international industrial standards, ensuring consistent quality for your projects. Whether you’re a professional engineer, factory manager, or DIY enthusiast, these 10.9 grade imperial machine screws provide the versatility, strength, and precision to get the job done right the first time.

Warm Tip: Please confirm your required thread type (UNC/UNF/BWS) and head profile before purchase to ensure perfect compatibility with your components.