Professional Grade 12.9 high-strength imperial set screws (also known as machine rice or stop screws), precision-engineered for mechanical positioning, locking, and anti-loosening applications in industrial equipment. Designed to meet US imperial standards, these hex headless concave end set screws are available in 2# and 3/4 sizes with UNC (coarse thread) and UNF (fine thread) options—perfect for imperial-measured machinery, gears, pulleys, and precision components.
Crafted with Grade 12.9 high-strength alloy steel, these set screws deliver exceptional tensile strength and torque resistance, making them ideal for heavy-duty industrial use, high-stress applications, and machinery that requires secure, long-lasting positioning. The hex headless (hex socket) design ensures a flush, low-profile installation that won’t protrude or interfere with mechanical movement, while the concave end provides precise contact with shafts, gears, or other components—preventing slippage and ensuring accurate positioning.
The precision-machined inner hex (hex socket) drive offers a secure grip during installation, preventing slipping, stripping, or cross-threading even when applying high torque—critical for tight locking applications. Available in UNC and UNF thread types, these imperial set screws offer universal compatibility with imperial-measured mechanical parts, adapting to diverse industrial and commercial needs (e.g., automotive, aerospace, heavy machinery).
Engineered for precision and durability, the rolled threads ensure uniformity and a tight, anti-loosening fit that resists slippage under continuous mechanical vibration, heavy loads, or temperature fluctuations. Unlike standard screws, these set screws (machine rice/stop screws) are designed to lock components in place without damaging surfaces, making them ideal for precision instruments and delicate machinery.
Easy to install with standard imperial hex keys (Allen keys), no special tools required, these screws streamline assembly, maintenance, and repair processes. Their versatile design caters to both professional industrial use and specialized projects that demand imperial measurements—optimized for Google search and Shopify’s product page best practices to attract your target buyers seeking high-quality imperial set screws.
Core Features (SEO-Friendly, Keyword-Rich)
- Grade 12.9 high-strength alloy steel: exceptional tensile strength and torque resistance for heavy-duty industrial applications.
- Imperial specifications: #2, 3/4 sizes with UNC (coarse) and UNF (fine) thread types, compatible with US imperial equipment.
- Hex headless (hex socket) design: flush, low-profile installation, no interference with mechanical movement.
- Concave end: precise contact with components, secure positioning without surface damage.
- Multi-name compatibility: set screw, machine rice, stop screw—covers industry 俗称 for broader search reach.
- Precision-rolled threads: uniform, tight anti-loosening fit, resistant to vibration and heavy loads.
- Hex socket drive: secure grip, no slipping or stripping, easy torque application with standard hex keys.
- Industrial-grade durability: wear-resistant, deformation-proof, ensures long-term reliability and reduces maintenance.
Ideal For
- Industrial machinery manufacturers and maintenance teams (imperial-equipped)
- Automotive component assembly and repair (US standards)
- Aerospace auxiliary positioning and locking applications
- Precision instrument and delicate machinery manufacturing
- Gear, pulley, and shaft locking projects
- Professional engineers and maintenance technicians
- Hardware supply companies specializing in imperial fasteners
- Specialized DIY projects requiring high-strength imperial set screws
Why Choose Our Grade 12.9 Imperial Set Screws?
Unlike generic imperial set screws, our Grade 12.9 precision screws are engineered for maximum strength and strict compatibility with UNC/UNF thread standards. The hex headless concave end design delivers precise positioning and a flush finish, while the machine rice/stop screw functionality ensures secure locking without component damage. With #2 and 3/4 size options, these screws cater to diverse imperial assembly needs—from compact instruments to heavy machinery. Optimized to rank well on Google and convert Shopify visitors, they offer the precision, durability, and versatility that industrial imperial hardware buyers demand.
