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DIN 6916 300HV Structural Washer Zinc CR3

DIN 6916 300HV Structural Washer — 45# Carbon Steel, Zinc CR3

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 zinc electroplating and trivalent chromium (CR3) passivation. 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. The high hardness (300–370 HV) prevents the washer from embedding into the connected parts under high bolt preload, maintaining clamping force integrity in structural joints. Zinc CR3 finish provides ≥72h salt spray resistance with full RoHS compliance.

Product Highlights

  • Standard: DIN 6916 — equivalent to ISO 7416, DIN EN 14399-6
  • Material: 45# Medium Carbon Steel (quenched & tempered)
  • Surface Treatment: Zinc Electroplating + CR3 Trivalent Chromium Passivation
  • Hardness: 300–370 HV (Product Grade A, per DIN 522)
  • Corrosion Resistance: ≥72h neutral salt spray (NSS) per ISO 9227
  • 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
  • Used with: High-strength bolts property class 10.9 in HV structural connections
  • RoHS Compliant — CR3, no Cr6+

Dimensional Specifications — DIN 6916, 45# Carbon Steel Zinc CR3

All dimensions in millimeters (mm). Per DIN 6916 / ISO 7416.

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. d1 = inner diameter; d2 = outer diameter; h = thickness; e = external chamfer; c = internal chamfer. Both chamfers at 45°.

Material & Mechanical Properties — 45# Carbon Steel, Zinc CR3

Property Value
Material Grade 45# Medium Carbon Steel (GB/T 699)
C Content 0.42 – 0.50%
Heat Treatment Quench & Temper
Hardness 300–370 HV (Product Grade A)
Surface Treatment Zinc Electroplating + CR3 Passivation
Salt Spray Resistance ≥72h NSS per ISO 9227
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 — CR3, no Cr6+

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
  • H/HV marking: Required by DIN 6916 / DIN EN 14399-6 for traceability and inspection in structural assemblies
  • Standard compliance: Structural bolted connections per EN 1090 require DIN 6916 / ISO 7416 washers with property class 10.9 bolts

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

  • High-tensile structural bolting (HV) — steel frame connections with class 10.9 bolts per EN 1090
  • Steel bridges & civil infrastructure — structural joints requiring certified hardened washers
  • Industrial buildings & warehouses — steel frame column and beam connections
  • Transmission towers & pylons — high-load structural bolted connections
  • Offshore & heavy industrial structures — zinc CR3 for corrosion protection
  • Machinery & equipment frames — high-preload bolted joints requiring hardened washers

Product Photo Gallery

FULLERKREG DIN 6916 300HV Structural Washer, 45# Carbon Steel, Zinc CR3:

[ 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, RoHS declarations available
  • ⚡ Fast lead times — standard sizes in stock, ready to ship

Frequently Asked Questions

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: Why must structural washers be hardened?
A: High-tensile bolts (class 10.9) are tightened to very high preloads. Soft washers would embed into the steel surface under this load, reducing clamping force and compromising joint performance. DIN 6916 washers at 300–370 HV resist embedding and maintain full clamping force.

Q: What does the H/HV marking mean?
A: H/HV is the product marking required by DIN 6916 / DIN 522 for identification and traceability in structural assemblies. H = for use under bolt head; HV = for use under nut. Both are identical in dimensions — the marking enables inspection compliance.

Q: What is CR3 passivation?
A: CR3 refers to trivalent chromium passivation over zinc electroplating. Provides ≥72h NSS corrosion protection without Cr6+. Fully RoHS compliant.

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

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