Product Summary

Longze Hex Flange Nuts are high-performance fasteners featuring an integrated circular flange that acts as a built-in washer. As a leading Metric Flange Nuts Supplier, we manufacture to DA

6923 E ISO 4161 standards, providing Heavy Duty Flange Nuts for automotive chassis, solar mounting systems, E industrial structural steel where high-torque vibration resistance is critical.

• ✔ Serrated Flange Nuts Option: Our specialized Dadi flangiati dentellati feature under-head "teeth" that bite into the material, providing superior mechanical locking against rotational loosening.

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• ✔ High-Tensile Performance: Available in Grade 10 and 12 carbon steel for safety-critical heavy machinery and industrial assemblies.

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• ✔ Washers Replacement: The large bearing surface effectively replaces the need for separate flat and spring washers, reducing assembly time and costs.

• Standards: DIN 6923, ISO 4161, ASME B18.16.4.

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• Size Range: M3 to M24 | 1/4” to 1” (Full metric & imperial stock).

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• Property Class: Grade 8, 10, 12, A2-70, A4-80.

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• Surface Finish: Hot-Dip Galvanized (HDG), Zinc Plated, Electropolished.

Mechanical Properties & Material Hardness

• Matching the certified tensile strength and hardness ratings for industrial safety.

• Material Grade	Tensile Strength (Rm)	Yield Strength (Re)	Hardness (HB/HV)
  Carbon Steel Grade 8	≥ 800 MPa	≥ 640 MPa	233 - 353 HV
  Carbon Steel Grade 10	≥ 1000 MPa	≥ 900 MPa	295 - 353 HV
  Carbon Steel Grade 12	≥ 1200 MPa	≥ 1080 MPa	353 - 415 HV
  SS304 / SS316	≥ 700 MPa	≥ 450 MPa	140 - 200 HV

Dimensions & Global Size Conversion

• Metric to Inch Comparison: Use this integrated conversion table to identify the exact specifications required for your international project. Longze ensures precision engagement for both DIN and ASME bolt standards.

• American Size (#/Inch)	Nearest Metric Size (M)	Width Across Flats (s)	Flange Dia. (dc)	Nut Height (m)
  #10 - 24	M5	8.0 mm / 0.312"	11.8 mm / 0.465"	5.0 mm / 0.197"
  1/4" - 20	M6	10.0 mm / 0.437"	14.2 mm / 0.559"	6.0 mm / 0.236"
  5/16" - 18	M8	13.0 mm / 0.500"	17.9 mm / 0.705"	8.0 mm / 0.315"
  3/8" - 16	M10	15.0 mm / 0.562"	21.8 mm / 0.858"	10.0 mm / 0.394"
  1/2" - 13	M12	18.0 mm / 0.750"	26.0 mm / 1.024"	12.0 mm / 0.472"
  5/8" - 11	M16	24.0 mm / 0.937"	34.5 mm / 1.358"	16.0 mm / 0.630"

Surface Treatment & Corrosion Resistance

• Selecting the appropriate coating for diverse industrial environments.

• Coating Type	Process	Salt Spray Test	Best Application
  Hot-Dip Galv. (HDG)	Molten Zinc	500 - 800 Hours	Outdoor / Solar Racking
  Zinc Plated	Electrolytic	72 - 144 Hours	General Construction
  Dacromet / Geomet	Zinc-Flake	1000+ Hours	Automotive / Heavy Duty
  Electropolished	Chemical	1000+ Hours	Food / Marine (SS)

Avoid Pitfalls:

• Surface Irregularity: Flange nuts require a flat, smooth mating surface to maximize the contact area. Using them on heavily curved or uneven surfaces reduces the locking effect.

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• Over-Torquing: While flange nuts support high torque, exceeding the proof load can strip the threads or deform the flange "skirt," leading to loss of clamping force.

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• Misuse of Washers: Never use a flat washer under a flange nut. The flange is designed to replace the washer; adding one negates the anti-loosening properties.

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Perfect Fit Assembly:

• Thread Engagement: Ensure the bolt or stud extends at least two full threads beyond the top of the flange nut to guarantee full tensile strength utilization.

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• Serration Orientation: If using Dadi flangiati dentellati, ensure the serrations are facing the workpiece. These "teeth" are designed to dig in and prevent rotation.

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Quality Control & Logistics:

• ISO 9001 Certified: 5-step QC including Vibration Resistance Testing, Hardness Gradient Inspection, E Thread Go/No-Go Gauge verification.

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• Sea-Worthy Packaging: Fumigation-free pallets, wooden cases, cartons with inner plastic bags, 25kg cartons. Secured for maritime export from our Yongnian hub.

• Q: Are Serrated Flange Nuts reusable? A: While they can be reused, the serrations may wear down or mar the surface. For safety-critical joints, we recommend new nuts to ensure 100% locking torque.

• Q: Can I use these for high-vibration automotive parts? A: Absolutely. Longze Grade 10 and 12 flange nuts are specifically engineered to maintain clamp load in chassis and engine mounts.

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