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  • SAE J429 Grade 8 Fine Threaded Hex Head Screw
  • SAE J429 Grade 8 Fine Threaded Hex Head Screw
  • SAE J429 Grade 8 Fine Threaded Hex Head Screw
  • SAE J429 Grade 8 Fine Threaded Hex Head Screw
  • SAE J429 Grade 8 Fine Threaded Hex Head Screw
  • SAE J429 Grade 8 Fine Threaded Hex Head Screw
SAE J429 Grade 8 Fine Threaded Hex Head Screw

SAE J429 Grade 8 Fine Threaded Hex Head Screw

  • 500 - 4999 Kilograms
    $2
  • >= 5000 Kilograms
    $1.40
View product details

SAE J429 Grade 8 Fine Threaded Hex Head Screw

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • High-Strength Fastening: Designed to withstand heavy loads and mechanical stress due to SAE J429 Grade 8 specifications, offering a tensile strength of 150,000 psi.
  • Precision Engagement: Fine thread design ensures secure, tight fits in applications requiring high torque and alignment accuracy, such as machinery assembly or automotive components.
  • Corrosion Resistance: Galvanized finish protects against rust and environmental degradation, extending lifespan in harsh conditions.

Key features

  • 1. Material Technology

    • With high-strength alloy steel and a galvanized corrosion-resistant finish, outperform standard steel screws in harsh environments*.

  • 2. Interactive Design

    • With a hex head design and fine thread, achieve 25% greater thread engagement than coarse-thread screws for precision fastening*.

  • 3. Performance Parameters

    • Engineered to ANSI standards with SAE Grade 8 strength, delivering ~30% higher tensile strength than Grade 5 bolts*.

  • 4. Scenario Solutions

    • Ideal for precision machinery and automotive applications where fine thread engagement in thin materials ensures structural integrity compared to coarse-thread alternatives*.

  • 5. Certification Standards

    • ANSI-certified compliance ensures adherence to industrial safety standards, surpassing non-certified fasteners in reliability*.

Product details

SAE J429 Grade 8 Fine Threaded Hex Head Screw

The SAE J429 Grade 8 Fine Threaded Hex Head Screw is engineered for high-strength fastening in demanding applications. With a galvanized finish, alloy steel construction, and precision-machined fine threads, these screws deliver exceptional durability and compatibility with ANSI standards.

Technical specifications

FeatureSpecificationBenefit
MaterialAlloy Steel / SteelHigh tensile strength for heavy loads
Thread TypeFine Thread (Metric)Enhanced torque retention and precision
Head TypeHexagonalEasy tightening/loosening with tools
FinishGalvanizedCorrosion resistance in harsh environments
StandardANSI SAE J429 Grade 8Meets industry benchmarks for strength
MeasurementInch SystemCompatibility with imperial components

Customization guide

Adjustable parameters include:

  • Thread Pitch: Customize for tighter torque requirements or specific material compatibility.
  • Length/Thread Length: Tailor to fit application-specific engagement depths.
  • Material Grade: Opt for higher alloy content in Pro models for extreme environments.

Get inspired

With their fine threads and galvanized finish, these screws are ideal for automotive assemblies, industrial machinery, and outdoor equipment. Their hexagonal heads ensure reliable torque control, while ANSI compliance guarantees seamless integration into global supply chains.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Tensile Strength150,000 psi (Grade 8)+15% (172,500 psi)+30% (195,000 psi)*
Thread Precision±0.001" toleranceEnhanced ±0.0005"Premium ±0.0003"
Corrosion Resistance200+ hours salt sprayEpoxy-coated (+50% longevity)Duplex coating (1000+ hours)

Supplier's note

  1. Technical Breakthroughs:

    • Galvanized Finish: Triple the corrosion resistance of uncoated steel, enabling use in marine or chemical environments.
    • Fine Thread Design: 20% higher torque capacity than coarse threads, ideal for thin materials.
    • Alloy Steel Composition: Grade 8 material exceeds SAE J429 standards, with a 30% strength boost in Pro models.

  2. Optimal Version Selection:

    • Base Model: Suitable for standard automotive or light industrial use where ANSI compliance is critical.
    • Advanced Model: Best for moderate-duty machinery or environments with occasional exposure to moisture.
    • Pro Model: Designed for extreme applications like offshore equipment or aerospace, where corrosion resistance and ultra-high strength are paramount.

*Pro Model’s tensile strength exceeds industry benchmarks by 30%, ensuring safe handling of heavy loads. Paired with its duplex coating, it maintains structural integrity in corrosive conditions for decades.

Frequently asked questions

  • Which SAE J429 Grade 8 screw is best suited for high-load automotive applications?

  • How do I clean and maintain galvanized hex head screws to prevent corrosion?

  • Alloy steel vs. regular steel screws: Which is better for heavy machinery parts?

  • Can SAE Grade 8 screws be customized for non-standard thread pitches or lengths?

  • Is the SAE J429 Grade 8 material compliant with ANSI safety standards?

  • What are the benefits of fine threads on machine screws for precision assemblies?

  • Where are Grade 8 hex head screws commonly used in industrial settings?

  • Galvanized vs. non-galvanized screws: Which resists corrosion better in outdoor machinery?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
SAE J429 Grade 5 Machine ScrewLight-duty automotive, consumer goodsSteel (120,000 psi tensile strength)
Coarse thread (e.g., 13 TPI)
No finish		Cost-effective, easy to install, widely compatibleLower strength (▲1.25× weaker than Grade 8)
Prone to corrosion without coating
SAE J429 Grade 8 (Our Base)Heavy machinery, industrial equipmentAlloy steel (150,000 psi)
Fine thread (e.g., 24 TPI)
Galvanized (ASTM A153)		High strength (▲25% stronger than Grade 5)
Corrosion resistance		Higher cost
Requires precise torque to avoid stripping (▲1.5× torque capacity vs coarse thread)
Our Advanced (Grade 8 + Black Oxide)Harsh environments (marine/oil fields)Alloy steel (150,000 psi)
Fine thread
Black oxide + galvanized (ASTM A953)		Enhanced corrosion resistance (▲2× vs bare steel)
Friction-reduced surface		Most expensive tier
Specialized coating adds weight (~5% increase)
ANSI Coarse Thread Screw (Industry)General construction, low-stress jointsSteel (100,000 psi)
Coarse thread (e.g., 13 TPI)
No finish		Easy to assemble/disassemble, low costLower load capacity (▲30% weaker than fine thread)
No corrosion protection
Metric Fine Thread Screw (Competitor)European machinery, precision toolsStainless steel (180,000 psi)
Metric fine thread
Passivated finish		Higher thread engagement (▲1.8× torque)
Stainless durability		Non-ANSI compliance (incompatible with inch systems)
Brittle under shock loads
Stainless Steel Machine ScrewMedical devices, food processing304 Stainless (75,000 psi)
Coarse thread
Passivated finish		FDA-compliant, non-corrosive in acidic/alkaline environments▲50% weaker than Grade 8
Lower heat resistance (▲200°C max vs 600°C for alloy steel)

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