DIN 931 hex bolt grade 10.9

Description

1. Product Overview

DIN 931 hex bolt grade 10.9 is a high-strength metric hex-head bolt manufactured to DIN 931 standards and heat-treated to achieve a 10.9 tensile class. It is engineered for critical structural and mechanical fastening in heavy industry where shear and tensile loads are high. The bolt delivers predictable, certified mechanical performance (high yield and tensile strength) and consistent dimensional accuracy, reducing downtime and rework in assembly and maintenance. As a strategic fastener choice, it supports safer, longer-lasting joints across construction, heavy machinery, automotive, and infrastructure projects, improving lifecycle cost and operational reliability.

2. Key Specifications & Technical Characteristics

• Standard: DIN 931 (partially threaded hex bolt with chamfered end).

• Grade/Class: 10.9 (quenched and tempered, high tensile strength).

• Material: Alloy steel (commonly SAE 4140/40Cr or equivalent), heat-treated.

• Mechanical properties: Minimum tensile strength approximately 1,040 MPa, yield strength typically ~940 MPa (manufacturer-certified values vary; see test certificates).

• Surface finish options: Plain (black), zinc plated (passivated), hot-dip galvanized, mechanical galvanize, or other corrosion-resistant coatings on request.

• Thread specification: Metric coarse (M) thread series; available sizes M8–M36 (size availability depends on supplier).

• Lengths: Standard and custom lengths available (per DIN 931 partially threaded specification).

• Dimensional tolerances: Manufactured to DIN tolerance classes for thread and shank; certificates available on request.

• Packaging: Bulk strapped bundles, carton-packed multiples, palletized crates, or export-grade wooden boxes; inner protective wrapping available.

• Unit weight/density: Dependent on diameter and length; material density ~7.85 g/cm³ for steel (used for accurate logistics calculations).

• Traceability: Batch/heat-number traceability and mechanical test report (MTR) available upon request.

• Shelf life: Indefinite when stored dry; recommended indoor storage to prevent corrosion prior to installation.

• Compliance documentation: Supply-ready with material certificates, mechanical test certificates, and inspection reports on request.

3. Core Industrial Applications

• Construction & Structural Engineering: Primary use for bolted steel connections in buildings, bridges, steel frames, and heavy structural assemblies where high clamping force and fatigue resistance are required.

• Heavy Machinery & Equipment Manufacturing: Used in gearboxes, presses, cranes, and large rotating equipment where secure joints must withstand dynamic loads and vibration.

• Automotive & Commercial Vehicle Assembly: Selected for chassis, suspension subframes, and driveline components in commercial and off-highway vehicles requiring high-strength fasteners.

• Energy & Utilities: Employed in wind turbine assemblies, power plant equipment, and transmission structures where long service life and load-bearing capacity are critical.

• Mining & Industrial Processing: Preferred for conveyor systems, crushers, and heavy-duty plant equipment exposed to high stress and abrasive conditions.
  Why it outperforms alternatives:

• Higher tensile and yield strengths than Grade 8.8 bolts reduce bolt count or size for equivalent joint capacity.

• Heat-treated alloy composition provides better fatigue resistance under cyclic loading versus plain carbon bolts.

• Proven dimensional control and traceability reduce assembly failures and maintenance interventions, lowering total cost of ownership.

4. Competitive Advantages

• Quality consistency: Manufactured under controlled heat-treatment and machining processes with batch testing and MTRs to ensure repeatable mechanical performance.

• Supply reliability: Industrial-scale production, safety stocks, and established logistics partners minimize lead times and support large project timelines.

• Logistics capability: Bulk packaging and pallet/container optimization enable cost-effective global shipment; loading guidance and packing lists provided for expedited customs handling.

• Price competitiveness: Economies of scale and multiple finish options allow competitive unit pricing for large-volume procurements.

• Sustainability: Options for surface treatments with lower environmental impact and packaging optimized for recyclability; supplier can provide CO2 and material sourcing data on request.

• Technical support: Engineering datasheets, torque tables, recommended installation practices (preload/torque values), and on-demand technical consultation for joint design and validation.
  Positioning: Presented as a strategic sourcing item—choosing DIN 931 grade 10.9 bolts reduces lifecycle risk, supports higher safety margins, and streamlines procurement for large-scale industrial projects.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): BULK 20 MT.

• Loading capacity (MT per container):

  • 20 ft container: approximately 20–22 MT (palletized bulk depends on packaging).

  • 40 ft container: approximately 24–26 MT (palletized bulk depends on packaging).

• Lead times: Standard lead time dependent on order size and finish; contact supplier for current production and shipment schedules.

• Packaging & shipping: Export-ready palletized packaging, bundling options, and documentation (packing list, commercial invoice, MTRs) provided.

• Payment & commercial terms: Available upon request and negotiable for recurring or contractual supply agreements.