Home » High Nylon Locking Nuts (DIN 982) - Marine Stainless Steel (A4)

High Nylon Locking Nuts (DIN 982) - Marine Stainless Steel (A4)

High Nylon Locking Nuts — DIN 982 | Marine Stainless Steel A4 (SUS316)

FULLERKREG DIN 982 High Nylon Insert Lock Nuts in A4 Marine Grade Stainless Steel (SUS316) are engineered for the most demanding corrosion environments. 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. SUS316 (A4) provides superior resistance to chloride-induced corrosion compared to A2, making these nuts the preferred choice for marine, offshore, chemical processing, and coastal infrastructure applications. Surface is passivated and whitened for maximum corrosion protection.

Standard: DIN 982 (superseded by ISO 7042, dimensions remain interchangeable)  |  Material: SUS316 Marine Stainless Steel (A4)  |  Surface: Passivated / Whitened  |  Property Class: A4-70

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 1.5
M6 1.0 9.78 10.00 10.89 11.05 7.14 7.50 2.4 2.5
M8 1.25 12.73 13.00 14.20 14.38 9.14 9.50 2.8 5.6
M10 1.5 15.73 16.00 17.59 17.77 11.14 11.50 3.0 9.7
M12 1.75 17.73 18.00 19.85 20.03 13.40 14.00 3.5 14.8
M14 2.0 20.67 21.00 23.16 23.36 15.40 16.00 3.5 21.5
M16 2.0 23.67 24.00 26.75 26.75 17.40 18.00 4.0 30.6
M18 2.5 26.16 27.00 29.56 30.14 19.40 20.00 4.0 42.9
M20 2.5 29.16 30.00 32.95 33.53 21.40 22.00 4.5 58.2
M22 2.5 31.61 32.00 35.03 36.01 23.40 24.00 4.5 74.5
M24 3.0 35.00 36.00 39.55 40.13 25.40 26.00 5.0 97.0

* Dimensions per DIN 982 / ISO 7042. Unit weights are reference values for SUS316 material (density ≈ 8.0 g/cm³). Actual weights may vary slightly by batch.

Mechanical Properties

Property Value
Material Grade A4 (SUS316 Austenitic Stainless Steel)
Property Class A4-70
Tensile Strength ≥ 700 MPa
Proof Load Stress Per ISO 7042 / DIN 982
Nylon Insert Material Polyamide (PA6 / Nylon 6)
Max Operating Temp (Nylon) ≤ 120°C (continuous); ≤ 150°C (short-term)
Corrosion Resistance Excellent — superior to A2; ideal for marine, offshore, chloride-rich environments
Mo Content (SUS316) 2.0–2.5% Molybdenum — key differentiator vs A2/SUS304
Surface Treatment Passivated + Whitened (natural A4 finish)
RoHS Compliant Yes

Prevailing Torque Performance

Thread Min Prevailing Torque (N·m) Max Prevailing Torque (N·m) Min Proof Load (kN)
M5 0.08 0.60 7.0
M6 0.10 0.90 10.2
M8 0.20 1.50 18.4
M10 0.30 2.50 29.2
M12 0.50 4.00 42.5
M14 0.80 6.00 58.0
M16 1.00 8.00 76.0
M20 1.50 12.00 121.0
M24 2.50 20.00 177.0

* Prevailing torque values per DIN 982 / ISO 7042 for new nuts on first assembly.

A4 vs A2 — Why Choose Marine Grade?

Feature A4 — SUS316 (This Product) A2 — SUS304
Base Alloy 316 Austenitic SS 304 Austenitic SS
Molybdenum Content 2.0–2.5% Mo ✅ None ❌
Chloride Resistance Superior — resists pitting & crevice corrosion Moderate — susceptible to chloride attack
Marine / Offshore Use ✅ Recommended ⚠️ Limited suitability
Chemical Processing ✅ Excellent ⚠️ Moderate
Food & Pharmaceutical ✅ Preferred grade ✅ Acceptable
Cost Higher (premium alloy) Standard
Property Class A4-70 A2-70

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, structural joints, marine General locking, light assemblies
ISO Equivalent ISO 7042 ISO 10511

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. Although DIN 982 has been superseded by ISO 7042, the dimensional requirements are fully interchangeable. FULLERKREG manufactures to the current ISO 7042 standard with DIN 982 cross-reference documentation available upon request. All A4 material is sourced from certified SUS316 mill stock with full traceability.

  • ✅ DIN 982 / ISO 7042 compliant
  • ✅ Material: SUS316 (A4) with mill test reports available
  • ✅ RoHS & REACH compliant
  • ✅ Batch traceability with lot numbers
  • ✅ ASTM A276 Type 316 equivalent

Typical Applications

  • 🚢 Marine & offshore structures — hulls, decks, rigging hardware
  • 🏭 Chemical processing plants — pipe flanges, reactor assemblies
  • 🌊 Coastal & waterfront infrastructure — bridges, jetties, seawalls
  • 🍽️ Food & beverage processing equipment
  • 💊 Pharmaceutical manufacturing environments
  • ⚡ Desalination plants & water treatment facilities
  • 🔩 High-vibration machinery requiring reliable locking in corrosive conditions

Product Gallery

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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.
🌊 True Marine Grade — SUS316 A4 with verified Mo content; not substituted with A2 material.
📋 Full Documentation — Mill certificates, RoHS declarations, and dimensional inspection reports on request.
🚢 Global Shipping — Export experience to EU, North America, Southeast Asia, Middle East, and Oceania markets.

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