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Full Thread Hex Bolts (DIN 933) - Brass

Full Thread Hex Bolts (DIN 933 / GB 5783) — Brass (H65 / CuZn35)

FULLERKREG DIN 933 / GB 5783 full thread hex bolts in brass (H65 / CuZn35) offer a unique combination of properties unavailable in steel fasteners: natural corrosion resistance without surface coating, non-magnetic characteristics, non-sparking safety, excellent electrical and thermal conductivity, and an attractive golden appearance. Manufactured from H65 brass (65% copper, 35% zinc) and finished with a natural bright surface, these bolts are the preferred choice for electrical, marine, decorative, and hazardous-area applications where steel fasteners are unsuitable.

Product Highlights

  • Brand: FULLERKREG
  • Standards: DIN 933 / GB 5783 / ISO 4017
  • Material: Brass H65 (CuZn35 / C27200)
  • Composition: Cu 63.5–68.0% / Zn balance / Pb ≤ 0.03% / Fe ≤ 0.07% / others ≤ 0.5%
  • Thread Type: Full Thread (Fully Threaded Shank)
  • Surface: Natural brass finish (bright golden)
  • Head Type: Hexagon (Hex Head)
  • Size Range: M3 – M20
  • Thread: Metric coarse thread per ISO 261 / DIN 13
  • Key Properties: Non-magnetic • Non-sparking • Electrically conductive • Corrosion resistant

Why Choose FULLERKREG DIN 933 Brass Hex Bolts?

  • ✅ Non-magnetic — essential for MRI equipment, sensitive instruments, and electromagnetic-sensitive environments
  • ✅ Non-sparking — safe for use in explosive, flammable, and hazardous atmospheres (ATEX environments)
  • ✅ Excellent corrosion resistance — natural resistance to atmospheric corrosion, freshwater, and mild chemicals without surface coating
  • ✅ Electrically conductive — suitable for grounding, bonding, and electrical connection applications
  • ✅ Thermally conductive — good heat dissipation for thermal management applications
  • ✅ Attractive golden appearance — ideal for decorative, architectural, and visible fastening applications
  • ✅ Good machinability — H65 brass machines cleanly for precision applications
  • ✅ Good weldability & solderability — compatible with standard brass/copper joining processes
  • ✅ Full thread design — maximum thread engagement; ideal for through-bolting and variable grip-length applications
  • ✅ Wholesale & bulk supply — available in large quantities for electrical, marine, and OEM distributors

Brass H65 vs. Stainless Steel — When to Choose Brass

Property Stainless Steel (A2/A4) Brass H65 — This Product
Non-magnetic A2/A4: Non-magnetic (annealed) ✅ Fully non-magnetic
Non-sparking ❌ Sparks on impact ✅ Non-sparking (ATEX safe)
Electrical Conductivity Low (~1.4% IACS) ✅ High (~27% IACS)
Thermal Conductivity ~16 W/m·K ✅ ~120 W/m·K
Appearance Silver / grey ✅ Golden (decorative)
Corrosion Resistance (atmospheric) Excellent ✅ Excellent (no coating needed)
Seawater Resistance A4: Excellent Moderate (dezincification risk in aggressive seawater)
Tensile Strength 500–800 MPa 360–460 MPa (lower)
Machinability Moderate ✅ Excellent
Solderability Poor ✅ Excellent
Cost Moderate–High Moderate

Mechanical Properties — Brass H65 (CuZn35)

Specification Temper Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HV)
φ3-10 O60 ≥ 440 ≥ 360 ≥ 20 110
φ12-15 H02 ≥ 520 ≥ 210 ≥ 11 110
φ20-50 H04 ≥ 490 — ≥ 20 110
φ10-80 H02 ≥ 440 ≥ 320 — 110
φ25-60 H04 ≥ 460 ≥ 320 — 120

Physical Properties — Brass H65 (CuZn35)

Property Value Unit
Density 8.47 g/cm³
Melting Point 920 °C
Electrical Conductivity 27 % IACS
Thermal Conductivity 115 W/(m·K)
Elastic Modulus (E) 100 GPa
Coefficient of Thermal Expansion 20.1 × 10⁻⁶ /°C
Modulus of Elasticity 105.5 × 10³ ksi

Chemical Composition — Brass H65 (CuZn35 / C27200)

Element Cu (%) Pb (%) Fe (%) Others (%) Zn (%)
H65 / CuZn35 63.5–68.0 ≤ 0.03 ≤ 0.07 ≤ 0.5 Remainder

Material Designations — Cross-Reference

Standard Designation Region
GB (China) H65 China
ISO / EN CuZn35 International / Europe
UNS C27200 USA
JIS (Japan) C2700 Japan
DIN (Germany) CuZn35 / 2.0265 Germany

Fabrication Properties

Property Rating / Notes
Machinability Excellent — free-cutting characteristics
Hot Working Fair — suitable for hot forming processes
Cold Working Excellent — good ductility for cold forming
Weldability Good — gas, resistance, and brazing welding
Solderability Excellent — compatible with standard solder alloys
Joining Riveting, soldering, brazing
Plating Yes — can be plated (nickel, chrome, tin)

Dimensional Specifications — DIN 933 / ISO 4017 Full Thread Hex Bolts

All dimensions in millimeters (mm). Data per DIN 933 / ISO 4017 standard.

Thread (d) Pitch (mm) s — A/F (mm) e — A/C (mm) k — Head Height (mm) d_w min (mm) Length Range (mm)
M3 0.5 5.5 6.01 2.0 4.6 6 – 30
M4 0.7 7 7.66 2.8 5.9 8 – 40
M5 0.8 8 8.79 3.5 6.9 10 – 50
M6 1.0 10 11.05 4.0 8.9 10 – 80
M8 1.25 13 14.38 5.3 11.6 16 – 100
M10 1.5 17 18.90 6.4 14.6 20 – 100
M12 1.75 19 21.10 7.5 16.6 25 – 120
M16 2.0 24 26.75 10.0 22.5 35 – 150
M20 2.5 30 33.53 12.5 27.7 45 – 150

* Custom sizes and lengths available on request. Contact FULLERKREG for non-standard requirements.

Tolerance & Delivery Form

Specification Tolerance Quality Straight Bar Coil Wire
Length (m) Straightness (mm) ID (mm) Weight (kg)
φ8-8.5 H02 H65 ≥ 4000 1:1 600–700 500–700
φ9-13 H0-H2 H65 ≥ 4000 1:1 700–900 700–900
φ14-15 H0-H2 H65 ≥ 4300 1:1 0.6 1300 1000

Typical Applications

  • ⚡ Electrical & electronics — grounding bolts, bonding connections, bus bar fastening, switchgear, and control panel assembly
  • 🔋 Telecommunications & instrumentation — antenna mounting, instrument enclosures, precision equipment fastening
  • 💥 Hazardous & explosive environments (ATEX) — non-sparking fasteners for oil refineries, gas plants, chemical storage, and mining
  • 🧲 Marine & freshwater — boat fittings, freshwater plumbing, bilge equipment, and deck hardware in non-aggressive marine environments
  • 🏗️ Architectural & decorative — visible fastening in furniture, fixtures, façades, and interior design where golden appearance is desired
  • 🔧 Plumbing & HVAC — water fittings, valve assembly, heat exchanger fastening
  • 🎭 Musical instruments & precision devices — instrument assembly, clockwork, and precision mechanical devices
  • 🧪 Chemical processing — mild acid and alkali environments where brass corrosion resistance is adequate
  • 🏭 Food & beverage equipment — non-magnetic, non-toxic fastening in food contact applications (verify regulatory compliance)
  • 🚂 Automotive & transportation — battery terminals, electrical connections, and decorative trim fastening

Product Gallery

FULLERKREG DIN 933 Full Thread Hex Bolts — Brass H65 — actual product photos:

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

Ordering & Packaging Information

  • Packaging: Bulk carton / polybag per size and length; custom labeling available for OEM and distributor orders
  • MOQ: Contact FULLERKREG sales for wholesale minimum order quantities
  • Lead Time: Standard stock sizes ship promptly; large-volume orders subject to production schedule
  • Certifications: Material test reports (MTR) and chemical composition certificates available on request
  • Custom Requirements: Non-standard sizes, lengths, thread forms, and surface finishes (nickel plating, chrome plating) available — contact us

Frequently Asked Questions

Q: What is H65 brass and how does it differ from other brass grades?
A: H65 (CuZn35 / C27200) is a standard cartridge brass containing 63.5–68% copper and approximately 35% zinc. It offers an excellent balance of strength, ductility, corrosion resistance, and machinability. Compared to H62 (higher zinc), H65 has better corrosion resistance and ductility. Compared to H70 (higher copper), H65 offers slightly higher strength at lower cost.

Q: Are brass bolts non-sparking and safe for ATEX environments?
A: Yes. Brass is a non-sparking material, making it suitable for use in explosive, flammable, and hazardous atmospheres classified under ATEX or similar standards. This is one of the primary reasons brass fasteners are specified in oil refineries, gas plants, chemical storage facilities, and mining operations.

Q: Are brass bolts suitable for seawater applications?
A: H65 brass provides good resistance to freshwater and atmospheric corrosion. However, in aggressive seawater environments, brass may be susceptible to dezincification (selective leaching of zinc). For seawater applications, FULLERKREG recommends A4 (SUS316) stainless steel or Duplex 2205 fasteners for superior performance.

Q: Are brass bolts magnetic?
A: No. Brass is fully non-magnetic, making it ideal for MRI equipment rooms, sensitive scientific instruments, and any application where magnetic interference must be avoided.

Q: What is the difference between DIN 933 and DIN 931 for brass bolts?
A: DIN 933 (ISO 4017 / GB 5783) specifies fully threaded hex bolts — the thread runs the entire shank length. DIN 931 (ISO 4014) specifies partially threaded hex bolts with an unthreaded shank section. Full thread bolts offer greater grip-length flexibility and maximum thread engagement.

Q: Can brass bolts be plated or finished?
A: Yes. Brass bolts can be plated with nickel, chrome, tin, or other finishes for enhanced corrosion resistance, appearance, or specific application requirements. Contact FULLERKREG for custom finishing options.

Q: What nuts and washers are compatible?
A: Use DIN 934 brass hex nuts and DIN 125 brass flat washers for a fully matched brass assembly. FULLERKREG supplies the complete range of compatible brass fasteners.

FULLERKREG — Precision Fasteners to ISO/DIN/GB Standards. All technical data is provided for reference. Always verify fastener selection with a qualified engineer for structural and safety-critical applications.

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