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DIN 6916 300HV Structural Washer HDG

DIN 6916 300HV Structural Washer — 45# Carbon Steel, Hot-Dip Galvanized (HDG)

FULLERKREG DIN 6916 hardened structural washers are manufactured to DIN 6916 standard (equivalent: ISO 7416, DIN EN 14399-6) in 45# medium carbon steel, quenched and tempered to 300–370 HV hardness, with hot-dip galvanizing (HDG) per ISO 1461. DIN 6916 washers are specifically designed for use in high-tensile structural bolted connections (HV / HSFG assemblies) with high-strength bolts of property class 10.9. The washer features 45° chamfers on both inner and outer edges, and is marked H/HV per DIN 522 for identification in structural assemblies. Hot-dip galvanizing provides a thick, metallurgically bonded zinc coating (45–85 μm per ISO 1461) with excellent long-term corrosion protection and cathodic protection — the industry-standard surface treatment for structural steelwork in outdoor and exposed environments. Inner holes are reamed after galvanizing to restore dimensional tolerances per DIN 6916.

Product Highlights

  • Standard: DIN 6916 — equivalent to ISO 7416, DIN EN 14399-6
  • Material: 45# Medium Carbon Steel (quenched & tempered)
  • Surface Treatment: Hot-Dip Galvanizing (HDG) per ISO 1461
  • Zinc Coating Thickness: 45–85 μm (metallurgically bonded)
  • Hardness: 300–370 HV (Product Grade A, per DIN 522)
  • Size Range: M12 – M36
  • Profile: Round, chamfered — 45° external chamfer (e) + 45° internal chamfer (c)
  • Marking: H / HV per DIN 522 — required for structural assembly identification
  • Inner hole: Reamed after galvanizing to restore DIN 6916 dimensional tolerances
  • Cathodic protection: HDG zinc sacrificially protects base steel
  • Used with: High-strength bolts property class 10.9 in HV structural connections
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 6916, 45# Carbon Steel HDG

All dimensions in millimeters (mm). Per DIN 6916 / ISO 7416. Inner hole reamed after HDG to restore tolerances.

For Thread d1 min d1 max d2 min d2 max h min h max e min e max c min c max
M12 13.00 13.27 23.48 24.00 2.7 3.3 0.50 1.00 1.6 1.9
M14 15.00 15.27 27.48 28.00 2.7 3.3 0.50 1.00 1.6 1.9
M16 17.00 17.27 29.48 30.00 3.7 4.3 0.75 1.50 1.6 1.9
M18 19.00 19.33 33.38 34.00 3.7 4.3 0.75 1.50 2.0 2.5
M20 21.00 21.33 36.38 37.00 3.7 4.3 0.75 1.50 2.0 2.5
M22 23.00 23.33 38.38 39.00 3.7 4.3 0.75 1.50 2.0 2.5
M24 25.00 25.00 43.38 44.00 4.0 4.4 0.75 1.50 2.0 2.5
M27 28.00 28.52 49.00 50.00 4.4 5.6 1.00 2.00 2.5 3.0
M30 31.00 31.62 54.80 56.00 4.4 5.6 1.00 2.00 2.5 3.0
M36 37.00 37.62 64.80 66.00 5.4 6.6 1.25 2.50 2.5 3.0

All dimensions in mm per DIN 6916 / ISO 7416 after reaming. d1 = inner diameter; d2 = outer diameter; h = thickness; e = external chamfer; c = internal chamfer. Both chamfers at 45°.

HDG vs. Zinc CR3 vs. Black Oxide — Surface Treatment Comparison

Property HDG (This Product) Zinc CR3 Black Oxide
Coating type Hot-dip zinc (metallurgically bonded) Electroplated zinc + CR3 Chemical conversion (<1μm)
Coating thickness 45–85 μm 5–12 μm <1 μm
Cathodic protection Yes — full cathodic protection Limited No
Corrosion resistance Excellent — outdoor structural Good — ≥72h NSS Light — indoor only
Service life (outdoor) 25–50+ years Limited Not suitable
Inner hole treatment Reamed after galvanizing No reaming needed No reaming needed
Best for Heavy outdoor structural steelwork General industrial Indoor, black finish

Material & Mechanical Properties — 45# Carbon Steel, HDG

Property Value
Material Grade 45# Medium Carbon Steel (GB/T 699)
C Content 0.42 – 0.50%
Heat Treatment Quench & Temper (before galvanizing)
Hardness 300–370 HV (maintained after HDG)
Surface Treatment Hot-Dip Galvanizing per ISO 1461
Zinc Coating Thickness 45–85 μm
Cathodic protection Yes — zinc sacrificially protects base steel
Expected service life 25–50+ years in typical outdoor environments
Product marking H / HV per DIN 522
Equivalent standards ISO 7416 · DIN EN 14399-6 · PN 82039 · UNI 5714 · EU 784
Used with bolt class Property class 10.9 (HV structural bolting)
RoHS / REACH Compliant

Why High Hardness (300–370 HV) Is Required for Structural Washers

  • Embedding prevention: High-tensile structural bolts (class 10.9) are tightened to very high preloads. A soft washer would embed into the connected steel surface, reducing clamping force and compromising joint integrity
  • Load distribution: The hardened washer distributes the high bolt head/nut bearing load over a larger area without deforming
  • Chamfer function: The 45° external chamfer (e) accommodates the bolt head/nut fillet radius; the 45° internal chamfer (c) accommodates the bolt shank thread runout
  • HDG compatibility: Quench and temper is performed before galvanizing — HDG process temperature (~450°C) does not affect the hardness of 45# steel tempered above 500°C

DIN 6916 vs. DIN 125 — Key Differences

Feature DIN 6916 (Structural) DIN 125 (Standard)
Hardness 300–370 HV (hardened) 100–200 HV (soft)
Chamfer 45° inner & outer chamfer No chamfer
Marking H / HV required None
Used with Class 10.9 HV structural bolts General bolted assemblies
Standard DIN 6916 / ISO 7416 / EN 14399-6 DIN 125 / ISO 7089
Embedding resistance High — no embedding under preload Low — may embed under high load

Application Scenarios

  • Outdoor high-tensile structural bolting (HV) — steel frame connections with class 10.9 bolts in exposed environments
  • Steel bridges & civil infrastructure — structural joints requiring long-term outdoor corrosion protection
  • Industrial buildings & warehouses — outdoor steel frame column and beam connections
  • Transmission towers & pylons — HDG standard for outdoor high-voltage infrastructure
  • Coastal & port structures — HDG for salt air environments (non-direct seawater)
  • Agricultural & rural structures — steel frame connections in humid outdoor conditions

Product Photo Gallery

FULLERKREG DIN 6916 300HV Structural Washer, 45# Carbon Steel, Hot-Dip Galvanized:

[ Photo 1 ] [ Photo 2 ] [ Photo 3 ] [ Photo 4 ]

Why Choose FULLERKREG?

  • 🏭 Direct manufacturer — factory in China, no middlemen
  • 📐 Strict DIN dimensional control — 100% inspection on dimensions and hardness
  • 🌍 Global export experience — serving distributors in Europe, North America, Southeast Asia
  • 📦 Flexible MOQ — small trial orders and large bulk shipments both welcome
  • 📋 Full documentation — material certs, hardness reports, HDG inspection reports, RoHS declarations
  • ⚡ Fast lead times — standard sizes in stock, ready to ship

Frequently Asked Questions

Q: Does HDG affect the hardness of DIN 6916 washers?
A: No. Quench and temper is performed before galvanizing. The HDG process temperature (~450°C) is below the tempering temperature used for 45# steel (typically 500–600°C), so hardness (300–370 HV) is maintained after galvanizing.

Q: Why is the inner hole reamed after HDG?
A: HDG adds 45–85 μm per surface. Without reaming, the inner hole would be undersized and the bolt would not pass through. Reaming after galvanizing restores the inner diameter to DIN 6916 tolerances while maintaining the HDG coating on all other surfaces.

Q: What is DIN 6916?
A: DIN 6916 specifies hardened round washers for high-tensile structural bolting (HV connections). Equivalent to ISO 7416 and DIN EN 14399-6. Hardness 300–370 HV, with 45° inner and outer chamfers, marked H/HV. Used with property class 10.9 bolts in structural steel connections per EN 1090.

Q: Do you provide material test certificates?
A: Yes. Mill certificates, hardness test reports, HDG coating thickness inspection reports, and RoHS declarations available upon request.

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