Through Hole Hex Socket Internal External Thread Nut For Fastening
Lighting And Furniture
The through-hole hexagon socket internal & external thread nut is a
precision fastener integrating hexagon socket drive, axial
penetration, and internal & external thread conversion functions.
It realizes rigid connection of different components through
specification adaptation of threads at both ends, and is widely
used in mechanical transmission and equipment assembly scenarios
requiring concealed fastening and reducing butt joint. Its
structural design combines the dual advantages of high-strength
fastening and flexible adaptation, making it a key component in
industrial connections for solving specification mismatch problems.
I. Core Structure and Design Highlights
Hexagon Socket Drive Head
The head adopts a hexagon socket groove design, compatible with
hexagon socket wrenches (DIN 912 specifications). It can apply high
tightening torque (recommended torque for M10 model: 25-30N・m),
avoiding slipping, and is suitable for concealed installation or
space-constrained scenarios.
Through-Hole Internal & External Thread Structure
Axially fully penetrating design, with internal threads at one end
(for connecting bolts/screws) and external threads at the other end
(for adapting to female parts/sleeves). The thread precision
reaches 6H/6g, with complete thread profile and no broken teeth,
ensuring connection concentricity ≤0.15mm to achieve stable force
transmission.
Mechanically Optimized Transition
The transition area between the head and the thread section is
designed with arc chamfering (R≥0.5mm) to reduce stress
concentration. The overall cold heading or forging forming ensures
high material density without sand holes, and its shear resistance
is superior to that of spliced nuts.
II. Core Parameter Specifications
| Parameter Category | Specific Parameters | Detailed Description |
|---|
| Execution Standard and Grade | Standard Basis | Complies with GB/T 5787 (General Specification for Hexagon Socket
Fasteners) and thread standard GB/T 192, compatible with metric
thread series. |
| Product Grade | Grade A precision, with thread tolerance 6H (internal)/6g
(external), across flats tolerance ±0.2mm, and length tolerance
±0.3mm. |
| Strength Grade | High strength of 8.8/10.9 grade; tensile strength ≥800MPa (for 8.8
grade), yield strength ≥640MPa, meeting the needs of medium and
above load. |
| Material and Surface Treatment | Base Material | 45# carbon steel (for 8.8 grade), 35CrMo alloy steel (for 10.9
grade), 304 stainless steel (for anti-corrosion scenarios). |
| Surface Treatment | Electro-galvanizing (zinc layer: 8-12μm, salt spray test ≥48h);
chrome plating (hardness ≥800HV, wear-resistant and aesthetic);
stainless steel passivation (improving corrosion resistance). |
| Thread Specifications | Internal Thread Specification | Metric M5-M20 (e.g., M8*1.25), with depth ≥1.5 times the thread
diameter, ensuring effective engagement length. |
| External Thread Specification | Metric M6-M22 (e.g., M10*1.5), customizable for reducing conversion
(e.g., internal M8→external M10) to adapt to different female part
requirements. |
III. Performance Advantages
Flexible Reducing Adaptation
Internal and external thread specifications can be customized (same
diameter/reducing), solving the problem of mismatched thread
specifications of bolts, sleeves, flanges and other components, and
reducing the cost of custom connectors.
Reliable High-Strength Fastening
8.8/10.9 grade strength is compatible with bolts of the same grade.
It maintains stable pre-tightening force under vibration and impact
conditions, avoiding connection loosening, and is suitable for key
nodes of mechanical transmission systems.
Friendly to Concealed Installation
The hexagon socket head can be sunk into the surface of the
connector, reducing the protruding height, beautifying the
appearance while avoiding collision interference. It is especially
suitable for exposed components of automated equipment and
precision instruments.
Strong Anti-Corrosion and Durability
Galvanized/passivated surface treatment effectively resists
atmospheric corrosion; stainless steel material can withstand humid
and mild chemical environments, extending the maintenance cycle.
IV. Typical Application Scenarios
Mechanical Transmission Equipment
Reducing connection of shaft systems between motors and reducers,
fixing of ball screw ends. The hexagon socket drive ensures
high-torque fastening, and internal & external threads adapt to
different shaft diameter specifications.
Automated Production Lines
Quick change parts of tooling fixtures, fixing of conveyor line
guide rails. The reducing conversion function simplifies the
universal design of multi-specification tooling.
Hydraulic and Pneumatic Systems
Adapter of pipeline joints, fixing of cylinder end caps. The
through-hole structure does not block fluid/gas circulation, and
the high-strength feature adapts to pressure environments.
Precision Instruments and Meters
Fixing of test equipment panels, connection of sensor mounting
bases. Grade A precision ensures assembly consistency, and the
hexagon socket design meets the compactness requirements of
instruments.
V. Installation and Maintenance Recommendations
Installation Points
Use a hexagon socket wrench of matching specification (avoid forced
twisting with a wrench plus sleeve). Tighten according to the
recommended torque (28N・m for M10 8.8 grade), ensuring complete
thread engagement (engagement length ≥ thread diameter).
Maintenance Notes
Regularly check for thread slipping and rust. For galvanized parts
with local rust, clean them in time and touch up with anti-rust
agent; for stainless steel parts, avoid direct contact with carbon
steel to prevent electrochemical corrosion.
With its precise specification conversion capability, high-strength
fastening performance and concealed installation advantages, the
through-hole hexagon socket internal & external thread nut provides
an efficient and reliable solution for industrial reducing
connection scenarios, and is an indispensable precision fastener in
mechanical manufacturing, automated equipment and other fields.
