Fasteners (Bolts/Nuts): Strength Grade 4.6, 8.8, 10.9, 12.9

Component Specifications

Definition

Bolts and nuts are standardized threaded fasteners that create secure, adjustable, and removable connections in structural bracing systems. Bolts feature external threads that engage with the internal threads of nuts, generating clamping force through torque application to resist shear, tension, and vibration loads while maintaining alignment and structural integrity.

Working Principle

Mechanical fastening through threaded engagement creates clamping force when torque is applied to the nut or bolt head. This force compresses joined materials between the bolt head and nut, generating friction that resists relative movement while the threads provide mechanical interlocking against axial forces.

Materials

Carbon steel (Grade 4.6-12.9), alloy steel, stainless steel (A2/A4), titanium, brass, or specialized coatings (zinc, galvanized, Dacromet) for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Head Type	Hex, socket, flange
Thread Type	Metric (ISO), UNC/UNF
Thread Pitch	Standard, fine
Strength Grade	4.6, 8.8, 10.9, 12.9
Surface Treatment	Zinc-plated, hot-dip galvanized, phosphate
Torque Specification	Based on diameter and grade

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 898, ISO 4014, ISO 4032, DIN 931, DIN 934, ASME B18.2.1

Parent Products

This component is used in the following industrial products

Bracing System

A structural reinforcement system that provides lateral stability and load distribution within a gantry structure.

View Product Details

Operator Seat & Mounting

The operator seat and its mounting system within the operator cabin, providing secure seating and attachment to the cabin structure.

View Product Details

Engineering Analysis

Risks & Mitigation

Over-torquing causing thread stripping
Under-torquing leading to joint loosening
Galvanic corrosion in dissimilar metals
Fatigue failure from vibration
Improper thread engagement

FMEA Triads

Trigger: Incorrect torque application
Failure: Joint loosening or bolt fracture
Mitigation: Use calibrated torque wrenches, follow manufacturer specifications, implement torque verification procedures

Trigger: Corrosive environment exposure
Failure: Reduced cross-sectional area, strength degradation
Mitigation: Select appropriate corrosion-resistant materials, apply protective coatings, implement regular inspection schedules

Trigger: Vibration-induced fatigue
Failure: Crack initiation and propagation
Mitigation: Use locking nuts, apply thread-locking compounds, implement vibration-damping washers, regular inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread pitch tolerance per ISO 965, dimensional tolerances per ISO 4759, mechanical properties per ISO 898

Test Method

Tensile testing (ISO 898-1), hardness testing, torque-tension testing, salt spray testing for corrosion resistance

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Fasteners (Bolts/Nuts)

Manufacturer profiles associated with Fasteners (Bolts/Nuts).

Sourcing Fasteners (Bolts/Nuts) from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Mounting Interface

Precision mounting interface connecting punch tips to pharmaceutical tablet press machines for accurate tablet production.

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Frequently Asked Questions

What determines the strength grade of bolts?

The strength grade (e.g., 8.8, 10.9) indicates tensile strength and yield strength ratios. The first number represents 1/100 of the minimum tensile strength in MPa, while the second number indicates the yield strength ratio.

How is proper torque determined for bolt installation?

Torque is calculated based on bolt diameter, strength grade, material friction coefficients, and joint requirements using standardized formulas or manufacturer specifications to achieve optimal clamping force without over-tightening.

What maintenance is required for fasteners in bracing systems?

Regular inspection for corrosion, loosening, or deformation; periodic re-torquing if specified; replacement if wear exceeds tolerance; and lubrication if required by the application environment.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Fasteners (Bolts/Nuts)