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DIN 6916 300HV Structural Washer Black

DIN 6916 300HV Structural Washer — 45# Carbon Steel, Black Oxide Finish

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 a black oxide (blackening) surface finish. 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 black oxide finish provides a uniform matte black appearance with light corrosion protection — suitable for indoor structural applications and assemblies where a black finish is specified or preferred. Black oxide does not affect dimensional tolerances or hardness.

Product Highlights

  • Standard: DIN 6916 — equivalent to ISO 7416, DIN EN 14399-6
  • Material: 45# Medium Carbon Steel (quenched & tempered)
  • Surface Treatment: Black Oxide (Blackening)
  • 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
  • Used with: High-strength bolts property class 10.9 in HV structural connections
  • Black oxide finish: Uniform matte black appearance, light corrosion protection, no dimensional impact
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 6916, 45# Carbon Steel Black

All dimensions in millimeters (mm). Per DIN 6916 / ISO 7416. Black oxide adds <1 μm — no dimensional impact.

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°. Black oxide coating <1μm — no dimensional impact.

Black Oxide vs. Zinc CR3 — Surface Treatment Comparison

Property Black Oxide (This Product) Zinc CR3
Appearance Matte black, uniform Bright silver
Coating thickness <1 μm — no dimensional impact 5–12 μm
Corrosion resistance Light — indoor / dry environments Good — ≥72h NSS
Dimensional impact None Minimal (5–12 μm)
RoHS compliant Yes Yes — CR3, no Cr6+
Best for Indoor structural, black finish specified Outdoor / light outdoor, corrosion protection

Material & Mechanical Properties — 45# Carbon Steel, Black Oxide

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 Black Oxide (Blackening)
Coating thickness <1 μm
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
  • H/HV marking: Required by DIN 6916 / DIN EN 14399-6 for traceability and inspection in structural assemblies

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

  • Indoor high-tensile structural bolting (HV) — steel frame connections with class 10.9 bolts, black finish preferred
  • Steel buildings & industrial structures — interior column and beam connections
  • Machinery & equipment frames — high-preload bolted joints where black finish is specified
  • Architectural steelwork — exposed structural connections where black appearance is required
  • General HV structural connections — wherever black oxide DIN 6916 washers are specified

Product Photo Gallery

FULLERKREG DIN 6916 300HV Structural Washer, 45# Carbon Steel, Black Oxide:

[ 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 black oxide finish?
A: Black oxide (blackening) is a chemical conversion coating that produces a uniform matte black iron oxide layer (<1 μm thick) on the steel surface. It provides light corrosion protection and a black appearance without affecting dimensions or hardness. Suitable for indoor and dry environments; not recommended for outdoor or high-humidity applications without additional oil or wax treatment.

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.

Q: When should I choose black oxide over zinc CR3?
A: Choose black oxide when a black appearance is required or specified, and the application is indoor or dry. Choose zinc CR3 when corrosion protection is needed for outdoor or humid environments (≥72h NSS).

Q: Does black oxide affect dimensions or hardness?
A: No. Black oxide coating is <1 μm thick — negligible dimensional impact. Hardness (300–370 HV) is achieved by quench and temper before blackening and is not affected by the surface treatment.

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

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