Home » High Nylon Locking Nuts (DIN 982) - Zinc Plated Carbon Steel (Class 8)

High Nylon Locking Nuts (DIN 982) - Zinc Plated Carbon Steel (Class 8)

High Nylon Locking Nuts — DIN 982 | Zinc Plated Carbon Steel (Class 8)

FULLERKREG DIN 982 High Nylon Insert Lock Nuts in Class 8 zinc-plated medium carbon steel deliver superior clamping strength combined with reliable vibration-resistant locking. The high-profile (Type P) hexagon body incorporates a non-metallic nylon insert that deforms around the bolt thread upon engagement, generating consistent prevailing torque without adhesives or secondary locking features. Manufactured from 35K medium carbon steel — heat-treated to achieve Class 8 mechanical properties — with a trivalent chromium zinc plating (Zinc CR3) for corrosion protection and full RoHS compliance. The preferred choice for high-load structural, automotive, and heavy machinery applications where both strength and vibration resistance are critical.

Standard: DIN 982 (ref. ISO 7042)  |  Material: Medium Carbon Steel 35K  |  Surface: Zinc Plated CR3 (Trivalent Chromium)  |  Property Class: Class 8

Dimensional Data

Thread
d		 Pitch
(mm)		 Width Across Flats
s (mm)		 Width Across Corners
e (mm)		 Nut Height
m (mm)		 Nylon Insert
Thickness
t (mm)		 Unit Weight
(g/pc)
min max min max min max
M5 0.8 7.78 8.00 8.63 8.79 6.14 6.50 2.4 1.4
M6 1.0 9.78 10.00 10.89 11.05 7.14 7.50 2.4 2.4
M8 1.25 12.73 13.00 14.20 14.38 9.14 9.50 2.8 5.3
M10 1.5 15.73 16.00 17.59 17.77 11.14 11.50 3.0 9.2
M12 1.75 17.73 18.00 19.85 20.03 13.40 14.00 3.5 14.0
M14 2.0 20.67 21.00 23.16 23.36 15.40 16.00 3.5 20.5
M16 2.0 23.67 24.00 26.75 26.75 17.40 18.00 4.0 29.0
M18 2.5 26.16 27.00 29.56 30.14 19.40 20.00 4.0 40.5
M20 2.5 29.16 30.00 32.95 33.53 21.40 22.00 4.5 55.0
M22 2.5 31.61 32.00 35.03 36.01 23.40 24.00 4.5 70.5
M24 3.0 35.00 36.00 39.55 40.13 25.40 26.00 5.0 91.0

* Dimensions per DIN 982 / ISO 7042. Unit weights are reference values for 35K carbon steel (density ≈ 7.85 g/cm³) including zinc plating. Actual weights may vary slightly by batch.

Mechanical Properties

Property Value
Material Medium Carbon Steel 35K (heat-treated)
Property Class Class 8 (per DIN 982 / ISO 7042)
Proof Load Stress 855 MPa (M5–M16) / 830 MPa (M18–M24)
Min. Tensile Strength 800 MPa
Hardness HRC 24–34 / HRB 99–HRC 34
Nylon Insert Material Polyamide (PA6 / Nylon 6)
Max Operating Temp (Nylon) ≤ 120°C (continuous); ≤ 150°C (short-term)
Surface Treatment Zinc Plated — Trivalent Chromium CR3 (RoHS compliant)
Zinc Plating Thickness ≥ 5 μm (standard); ≥ 8 μm available on request
Salt Spray Resistance ≥ 72 hours (white rust per ISO 9227)
RoHS Compliant Yes — Cr3 trivalent chromium, no hexavalent chromium (Cr6)

Prevailing Torque Performance

Thread Min Prevailing Torque (N·m) Max Prevailing Torque (N·m) Min Proof Load (kN)
M5 0.08 0.60 11.2
M6 0.10 0.90 16.3
M8 0.20 1.50 29.5
M10 0.30 2.50 47.0
M12 0.50 4.00 68.5
M14 0.80 6.00 93.5
M16 1.00 8.00 122.0
M20 1.50 12.00 195.0
M24 2.50 20.00 282.0

* Prevailing torque values per DIN 982 / ISO 7042 for new nuts on first assembly. Class 8 proof loads are significantly higher than Class 4.

Class 8 vs Class 4 — Strength Comparison

Property Class 8 — 35K (This Product) Class 4 — Q195
Material Medium Carbon Steel 35K (heat-treated) Low Carbon Steel Q195
Proof Load Stress 855 MPa 510 MPa
Min. Tensile Strength 800 MPa 400 MPa
Hardness HRC 24–34 HRB 70–90
Typical Application Heavy machinery, automotive, structural high-load joints General industrial, light construction
Surface Zinc CR3 Zinc CR3
Cost ★★ Mid-range ★ Most economical

Selection Guide — DIN 982 vs DIN 985 (High vs Low Type)

Feature DIN 982 (High Type) DIN 985 (Low Type)
Nut Height Higher profile (~1.0× thread dia.) Lower profile (~0.8× thread dia.)
Prevailing Torque Higher — better vibration resistance Standard
Reusability Limited (nylon deforms after 1st use) Limited (nylon deforms after 1st use)
Space Constraint Standard clearance required Suitable for tight axial space
Typical Application Heavy vibration, high-load structural joints General locking, light assemblies
ISO Equivalent ISO 7042 ISO 10511

Material Grade Overview — Full DIN 982 Range

Grade Class 8 — Zinc Plated (This Product) Class 4 — Zinc Plated A2 — Stainless Steel A4 — Marine Stainless
Material 35K Medium Carbon Steel Q195 Low Carbon Steel SUS304 SUS316
Strength Class ★★★ Class 8 ★ Class 4 ★★ A2-70 ★★ A4-70
Corrosion Resistance Moderate (zinc plated) Moderate (zinc plated) Good Excellent
Best For High-load, heavy vibration General industrial Outdoor / food grade Marine / chemical
RoHS ✅ CR3 ✅ CR3 ✅ ✅

Standard & Compliance

DIN 982 specifies metric prevailing torque hexagon nuts with a non-metallic insert — high type. The standard covers thread sizes M5 through M24 with property classes 4, 6, 8, and 10. Although DIN 982 has been superseded by ISO 7042, the dimensional requirements are fully interchangeable. FULLERKREG manufactures Class 8 nuts from heat-treated 35K medium carbon steel to meet the elevated proof load and hardness requirements of Class 8. All zinc plating uses trivalent chromium (CR3) passivation in full compliance with RoHS Directive 2011/65/EU.

  • ✅ DIN 982 / ISO 7042 compliant — Class 8
  • ✅ Material: 35K medium carbon steel, heat-treated, with mill certificates available
  • ✅ Zinc CR3 plating — RoHS & REACH compliant, no Cr6
  • ✅ Salt spray tested per ISO 9227 (≥ 72 hours)
  • ✅ Hardness verified per ISO 898-2
  • ✅ Batch traceability with lot numbers

Typical Applications

  • 🚗 Automotive chassis, suspension, and drivetrain assemblies
  • 🛠️ Heavy machinery & industrial equipment manufacturing
  • 🏗️ Structural steel connections — bridges, towers, frames
  • ⚡ Power generation & transmission equipment
  • 🚂 Railway rolling stock & track infrastructure
  • 🚢 Port & lifting equipment — cranes, hoists, winches
  • 🔧 High-vibration machinery requiring maximum locking torque

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⚙️ Why FULLERKREG

🏭 Direct Manufacturer — No middlemen. Factory-direct pricing with full production traceability.
📐 Precision to Standard — Every batch dimensionally verified against DIN 982 / ISO 7042 gauging.
🔩 Wide Size Range — M5 to M24 in stock; custom sizes and non-standard threads available on request.
📦 Flexible MOQ — Bulk packing (1,000–50,000 pcs/bag) or retail packaging available.
🔥 High-Strength Class 8 — Heat-treated 35K medium carbon steel; proof load verified per ISO 898-2.
✅ RoHS CR3 Zinc Plating — Trivalent chromium passivation; fully compliant for EU and global export.
📋 Full Documentation — Mill certificates, hardness reports, RoHS declarations, and salt spray test results on request.
🚢 Global Shipping — Export experience to EU, North America, Southeast Asia, Middle East, and Oceania markets.

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