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Hex Flange Nuts are specialized fastening components designed with an integrated washer-like base that distributes load evenly and improves joint stability under vibration. Widely manufactured in stainless steel, carbon steel, and alloy steel grades, these nuts conform to standards such as DIN 6923, ISO 4161, and ASTM specifications, making them suitable for high-performance assemblies across automotive, construction, and heavy machinery industries.
The flange design eliminates the need for a separate washer, reducing assembly time while enhancing torque retention. Serrated variants provide additional anti-loosening capability, especially in dynamic or vibration-prone environments.
KK Fasteners supplies precision-engineered Hex Flange Nuts to global markets, ensuring dimensional accuracy, material traceability, and compliance with international quality benchmarks required by OEMs and EPC contractors.
| Parameter | Details |
|---|---|
| Material | Stainless Steel (SS 304, SS 316), Carbon Steel (Grade 4, 8), Alloy Steel |
| Grades | A2-70, A4-80, Class 8, Class 10, ASTM A194 Gr.2H |
| Size Range | M5 to M24 / 3/16" to 1" |
| Thread Type | Metric, UNC, UNF |
| Standards | DIN 6923, ISO 4161, ASTM A563, BS 4190 |
| Surface Finish | Zinc Plated, Hot Dip Galvanized, Black Oxide, PTFE Coated |
| Type Variants | Serrated Flange Nuts, Non-Serrated Flange Nuts |
| Hardness | Up to 32 HRC (depending on grade) |
| Tensile Strength | Up to 800 MPa (Class 8) / 1000 MPa (Class 10) |
|
Nominal Size |
Basic
Major Diameter of Thread |
F | G | B | H | J | K | ||||
|
Width Across Flats |
Width Across Corners |
Dia.
Flange |
Thickness
Hex Nut |
Wrenching
Length |
Flange
Thickness |
||||||
| min | max. | min. | max. | min. | max. | min. | max. | min. | min. | ||
| Hex Flange Nuts | |||||||||||
| No.6 | 0.1380 | 0.302 | 0.312 | 0.342 | 0.361 | 0.406 | 0.422 | 0.156 | 0.171 | 0.10 | 0.02 |
| 8 | 0.1640 | 0.334 | 0.344 | 0.381 | 0.397 | 0.452 | 0.469 | 0.187 | 0.203 | 0.13 | 0.02 |
| 10 | 0.1900 | 0.365 | 0.375 | 0.416 | 0.433 | 0.480 | 0.500 | 0.203 | 0.219 | 0.13 | 0.03 |
| 12 | 0.2160 | 0.428 | 0.438 | 0.488 | 0.505 | 0.574 | 0.594 | 0.222 | 0.236 | 0.14 | 0.04 |
| 1/4 | 0.2500 | 0.428 | 0.438 | 0.488 | 0.505 | 0.574 | 0.594 | 0.222 | 0.236 | 0.14 | 0.04 |
| 5/16 | 0.3125 | 0.489 | 0.500 | 0.557 | 0.577 | 0.660 | 0.680 | 0.268 | 0.283 | 0.17 | 0.04 |
| 3/8 | 0.3750 | 0.551 | 0.562 | 0.628 | 0.650 | 0.728 | 0.750 | 0.330 | 0.347 | 0.23 | 0.04 |
| 7/16 | 0.4375 | 0.675 | 0.688 | 0.768 | 0.794 | 0.910 | 0.937 | 0.375 | 0.395 | 0.26 | 0.04 |
| 1/2 | 0.5000 | 0.736 | 0.750 | 0.840 | 0.866 | 1.000 | 1.031 | 0.437 | 0.458 | 0.31 | 0.05 |
| 9/16 | 0.5625 | 0.861 | 0.875 | 0.982 | 1.010 | 1.155 | 1.188 | 0.483 | 0.506 | 0.35 | 0.05 |
| 5/8 | 0.6250 | 0.922 | 0.938 | 1.051 | 1.083 | 1.248 | 1.281 | 0.545 | 0.569 | 0.40 | 0.05 |
| 3/4 | 0.7500 | 1.088 | 1.125 | 1.240 | 1.299 | 1.460 | 1.500 | 0.627 | 0.675 | 0.46 | 0.06 |
| Large Hex Flange Nuts | |||||||||||
|
Nominal Size |
Basic
Major Diameter of Thread |
F | G | B | H | J | K | ||||
|
Width Across Flats |
Width Across Corners |
Dia.
Flange |
Thickness
Hex Nut |
Wrenching
Length |
Flange
Thickness |
||||||
| min | max. | min. | max. | min. | max. | min. | max. | min. | min. | ||
| 1/4 | 0.2500 | 0.428 | 0.438 | 0.488 | 0.505 | 0.700 | 0.728 | 0.281 | 0.312 | 0.15 | 0.04 |
| 5/16 | 0.3125 | 0.489 | 0.500 | 0.557 | 0.577 | 0.790 | 0.820 | 0.343 | 0.375 | 0.20 | 0.04 |
| 3/8 | 0.3750 | 0.551 | 0.562 | 0.628 | 0.650 | 0.885 | 0.915 | 0.390 | 0.406 | 0.24 | 0.04 |
| 7/16 | 0.4375 | 0.675 | 0.688 | 0.768 | 0.794 | 1.100 | 1.131 | 0.437 | 0.468 | 0.26 | 0.04 |
| 1/2 | 0.5000 | 0.736 | 0.750 | 0.840 | 0.866 | 1.175 | 1.205 | 0.485 | 0.515 | 0.29 | 0.06 |
| 9/16 | 0.5625 | 0.861 | 0.875 | 0.982 | 1.010 | 1.260 | 1.300 | 0.546 | 0.578 | 0.37 | 0.06 |
| 5/8 | 0.6250 | 0.922 | 0.938 | 1.051 | 1.083 | 1.280 | 1.360 | 0.600 | 0.640 | 0.42 | 0.06 |
Hex Flange Nuts are used in applications where secure fastening, load distribution, and vibration resistance are critical to system reliability.
Hex Flange Nuts are primarily manufactured using cold forging processes, followed by precision threading and surface finishing. This method ensures high dimensional consistency and improved mechanical strength due to refined grain structure.
Each batch undergoes strict quality checks, including thread gauge inspection, hardness testing, tensile verification, and coating thickness evaluation. Surface finish uniformity is also verified to ensure corrosion protection meets specified standards.
At KK Fasteners, production is supported by ISO 9001-certified systems, with full lot traceability maintained from raw material to final dispatch. Compliance with RoHS and REACH requirements ensures suitability for global industrial applications.
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Hex Flange Nuts are hexagonal nuts with a built-in flange that functions like an integrated washer. This design distributes load evenly across the surface and improves resistance to loosening, making them ideal for applications exposed to vibration or dynamic stress.
Hex Flange Nuts are commonly available in stainless steel grades such as SS 304 and SS 316 for corrosion resistance, as well as carbon steel and alloy steel for higher strength applications. The material selection depends on environmental exposure and load requirements.
These nuts are typically manufactured according to DIN 6923 and ISO 4161 standards. They may also comply with ASTM A563 specifications depending on the application and regional requirements, ensuring dimensional accuracy and mechanical performance.
Serrated flange nuts provide enhanced grip and are suitable for vibration-prone environments where loosening is a concern. Non-serrated flange nuts are preferred when the mating surface must remain undamaged or when the nut needs to be reused multiple times.
A reliable supplier should offer ISO-certified production, material traceability, and compliance with international standards. Companies like KK Fasteners support global supply with consistent quality checks and documented inspection processes for industrial buyers.
Precision, compliance, and supply reliability define the performance of Hex Flange Nuts in critical applications. With controlled manufacturing processes, certified materials, and consistent export supply, KK Fasteners supports industrial buyers with dependable fastening solutions.
For project-specific requirements or bulk inquiries, connect with the engineering team to request a quotation or detailed technical specifications.
