Longze Hexagon Socket Set Screws, commonly referred to as Grub Screws, are high-precision industrial fasteners engineered for seamless integration into demanding mechanical assemblies. Manufactured in strict accordance with DIN 913-916, ISO 4026-4029, and ASME B18.3 standards, these headless fasteners are designed to be driven fully into threaded holes, delivering exceptional clamping force to secure rotating or sliding components to shafts without protruding above the surface.
Our set screws feature a precision-cut internal hex drive that facilitates high-torque tightening even in the most confined spaces. Available in a diverse range of point geometries—including Flat, Cone, Dog, and Cup points—Longze provides the exact grip and alignment capabilities required for everything from precision instrumentation and automotive engine bays to heavy-duty mechanical power transmission systems.
Detailed Parameters
| Standards | DIN 913-916 / ISO 4026-4029 / ASME B18.3 | Metric Range | M1.6 to M30 |
|---|---|---|---|
| Inch Range | #0 to 1" (UNC / UNF) | Property Class | 45H (Alloy Steel) / A2-70, A4-80 (Stainless) |
| Drive Type | Internal Hexagon Socket | Point Styles | Flat, Cone, Dog, Cup Point |
| Material | Alloy Steel (Grade 12.9) / Stainless Steel | Surface Finish | Black Oxide, Zinc Plated, Dacromet, Passivated |
| Certification | ISO 9001 Certified Production | Testing | Rockwell Hardness (HRC) & Torque Verification |
Key Advantages
High-Torque Performance
Forged from high-tensile Alloy Steel (Grade 12.9) to prevent socket stripping under heavy industrial loads.
Superior Vibration Resistance
Specialized Cup and Cone points bite deeply into mating surfaces to ensure stability under dynamic stress.
Precision Machining
Clean, burr-free threads ensure smooth engagement and accurate pressure distribution across the shaft.
Flush Mounting Design
The headless profile ensures zero protrusion, eliminating interference with moving machinery parts.
Global Versatility
Full compliance with Metric (DIN/ISO) and Imperial (ASME) specs for seamless global OEM production.
Advanced Coatings
From Black Oxide to Dacromet, we provide coatings tailored for marine, medical, and automotive environments.
Product Gallery
Management Platforms
Quality Certification
ISO 9001 certified production lines ensure consistent dimensional accuracy across all batches.
Hardness Verification
Strict Rockwell testing (HRC) ensures points do not flatten during high-pressure installation.
Torque Testing
Sample batch testing confirms internal hex durability against maximum rated installation torque.
Laser Verification
Utilizing laser-verified socket depth and thread concentricity for aerospace-grade precision.
Logistics Optimization
Standard 25kg export cartons with fumigation-free pallets for efficient global shipping.
Custom Branding
Custom small-box branding and specialized labeling available for industrial distributors.
Investment Return Comparison
| Performance Metric | Standard Fasteners | Longze Precision Set Screws |
|---|---|---|
| Socket Durability | Moderate / Prone to stripping | High / Laser-verified depth |
| Holding Power | Standard friction grip | Maximum "bite" via Cup/Cone points |
| Corrosion Resistance | Basic Zinc Plating | Multi-tier (Dacromet/Passivated) |
| Installation Speed | Standard manual torque | Optimized for power-bit integration |
| Component Lifespan | Frequent loosening/replacement | Extended via vibration resistance |
Frequently Asked Questions
The Cup Point (DIN 916) is the industry standard due to its versatile grip and high resistance to loosening in rotating assemblies.
While they can be removed, points like Cone and Cup may deform after the first high-torque application, potentially reducing effectiveness.
We recommend applying a small amount of anti-seize lubricant to the threads to prevent galling, especially in stainless-to-stainless assemblies.
Choose Flat Points (DIN 913) when you need to reposition components frequently without scarring or damaging the shaft surface.
Dacromet provides superior salt spray resistance (1000h+), making it ideal for automotive and high-stress outdoor environments.
Dog Points (DIN 915) feature a cylindrical protrusion designed to fit into pre-drilled holes or grooves for precise alignment and locating.
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