Technical Specifications

DIN 931 / ISO 4014 / GB 5782 Hex Head Bolts with Shank 4.8 / 5.8 / 8.8 / 10.9 / 12.9 Plain, Black Oxide, Zinc Plated (Cr3+), Hot Dip Galvanized, Dacromet
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DIN 931 / ISO 4014 / GB 5782 Hex Head Bolts with Shank 4.8 / 5.8 / 8.8 / 10.9 / 12.9 Plain, Black Oxide, Zinc Plated (Cr3+), Hot Dip Galvanized, Dacromet
DIN 931 / ISO 4014 / GB 5782 Hex Head Bolts with Shank 4.8 / 5.8 / 8.8 / 10.9 / 12.9 Plain, Black Oxide, Zinc Plated (Cr3+), Hot Dip Galvanized, Dacromet

Standard

DIN 931 / ISO 4014 / GB 5782

Specification

M3 - M64

Material

Carbon Steel / Alloy Steel / Stainless Steel (SS304/SS316)

Property Class

4.8 / 5.8 / 8.8 / 10.9 / 12.9

Finish

Plain, Black Oxide, Zinc Plated (Cr3+), Hot Dip Galvanized, Dacromet

Product Description

Metric Coarse,Fine Thread Available.

Technical Data & Drawings
Model: DIN 931 / ISO 4014 / GB 5782 Hex Head Bolts with Shank pdf
Dimension CodeSpecification (mm)
d
P
L
L (max)
L (min)
da (max)
ds (max)
ds (min)
e (min)
k (min)
k (max)
r (min)
s (max)
s (min)

Technical Specifications

DIN 931-2-2009 Hex Head Bolts with Shank
Product No.
DIN 931-2
Product Specification
M68 * 200
Product Standard
DIN 931-2-2009
Material Grade
—
Unit
mm
Mechanical Property
—
Dimension CodeSpecification (mm)Dimension CodeSpecification (mm)
dDiameterM68PPitch6
LLength200L(max)Lmax200.925
L(min)Lmin199.075da(max)damax75
ds(max)dsmax68ds(min)dsmin67.26
e(min)emin110.51k(min)kmin42.5
k(max)kmax43.5r(min)rmin2
s(max)smax100s(min)smin97.8
dsRod diameter67.26
Other Requirements
Technical Conditions
MaterialTypeSteelGeneral Technical Conditions
Grade
ThreadToleranceMechanical PropertyClass
StandardStandard
ToleranceProduct GradeSurface Treatment
Standard
Surface RoughnessSurface Defect
Acceptance & PackingReference Weight per 1000 (kg)

Industrial Applications

DIN 931 Hex Bolts (Partial Thread) | Industrial Applications

1. Heavy Machinery & Industrial Equipment

  • Large Gearbox & Transmission Assembly:Recommended: M20 * 100 / M24 * 120 | Grade 10.9 | Plain or Lightly OiledTechnical Insight: In high-torque environments, the unthreaded shank of DIN 931 acts as a dowel pin, offering superior shear resistance compared to full-thread bolts, ensuring the gearbox housing remains perfectly aligned.
  • Conveyor System Frameworks:Recommended: M12 * 80 / M16 * 100 | Grade 8.8 | Zinc PlatedTechnical Insight: The smooth shank minimizes wear on the mounting holes during continuous vibration, extending the fatigue life of the conveyor structure in mining and logistics sectors.

2. Steel Structures & Civil Engineering

  • Bridge Girders & Truss Connections:Recommended: M24 * 150 / M30 * 200 | Grade 10.9 | Hot Dip Galvanized (HDG)Technical Insight: DIN 931 is preferred for structural "slip-critical" joints. The shank handles lateral loads more effectively than threads, while the HDG coating ensures decades of protection against atmospheric corrosion.
  • Tower Crane Mast Sections:Recommended: M36 * 200 / M48 * 300 | Grade 12.9 | DacrometTechnical Insight: For critical lifting equipment, Grade 12.9 provides maximum tensile strength. The partial thread design prevents stress concentration at the joint's shear plane, crucial for safety at extreme heights.

3. Energy & Infrastructure

  • Power Transmission Tower Assembly:Recommended: M16 * 75 / M20 * 90 | Grade 8.8 | Hot Dip Galvanized (HDG)Technical Insight: Specifically designed to withstand high wind loads. The HDG finish provides a self-healing zinc layer, essential for maintenance-free operation in remote mountainous or coastal regions.
  • Hydroelectric Turbine Housing:Recommended: M30 * 180 / M36 * 220 | Stainless Steel A4-80 (SS316) | PassivatedTechnical Insight: In constant contact with flowing water, the SS316 shank ensures the bolt won't corrode or "freeze" into the housing, allowing for structural integrity and easier long-term maintenance.

4. Agricultural & Specialized Vehicles

  • Tractor Chassis & Suspension Joints:Recommended: M14 * 90 / M16 * 110 | Grade 10.9 | Zinc PhosphatedTechnical Insight: Agricultural machinery faces unpredictable terrain. The DIN 931 shank provides a tight fit in the pivot points, reducing "play" and ensuring the suspension geometry remains stable under heavy load.
  • Harvester Blade Mounting:Recommended: M10 * 60 / M12 * 70 | Grade 12.9 | GeometTechnical Insight: High-speed rotation requires perfect balance. The precision-ground shank of the partial thread bolt ensures the blades are centered and can withstand the extreme centrifugal and impact forces.

Packaging & Delivery

Standard Packaging

Inner Packaging

Small boxes (white/blue or EternalFast branded) with clear labeling.

Bulk packaging in heavy-duty plastic bags (25kg per bag) to prevent moisture.

Outer Packaging

Standard Export Cartons (36×24×16 cm or similar).

Net Weight: 25kg per carton.

Gross Weight: ~25.5kg.

Palletization & Protection

Euro Pallets / Fumigation-free Pallets:

Dimensions

800×1200 mm or 1000×1000 mm or customed.

Safety Reinforcement

Wrapped in Stretch Film for moisture protection.

Reinforced with Plastic/Steel Strapping.

Corner protectors to prevent carton crushing.


Shipping & Delivery

Loading Ports

Shanghai Port / Ningbo Port

Lead Time:

Stock items: 3-7 days.

Custom production: 15-30 days (depending on quantity and surface treatment).

Quality & Certificates

Material & Performance Certifications

  • Raw material Mill Test Certificate (MTC)
  • Material certification: 4.8/8.8/10.9/12.9, A2-70, A4-70, A4-80
  • Hardness & Tensile test report
  • Dimensional inspection report

Quality System

  • ISO 9001 Quality Management System
  • Strict quality control before shipment
  • Full inspection available upon request

Export Documents Support

  • Commercial Invoice
  • Packing List
  • Bill of Lading
  • Certificate of Origin (CO/Form E/Form F)
  • Material Test Certificate
  • Third-party inspection (SGS / BV available)