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 から

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

• ✔ Serrated Flange Nuts Option: Our specialized 鋸歯状フランジナット 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 鋸歯状フランジナット, 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、 そして 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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