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  • A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt
  • A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt
  • A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt
  • A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt
  • A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt
A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt

A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt

  • 1000 - 4999 Pieces
    $0.03
  • 5000 - 9999 Pieces
    $0.02
  • >= 10000 Pieces
    $0.01

Customization:

Customized logo（Min.Order: 10000 pieces）
Customized packaging（Min.Order: 10000 pieces）
Graphic customization（Min.Order: 10000 pieces）
View product details

A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Secure Fastening: Square head design with threaded shanks enables strong, stable connections in applications requiring high tensile strength.
  • Corrosion Resistance: Available in stainless steel grades (SS304/SS316) for durability in moisture-rich or chemically exposed environments.

Key features

  • 1. Material Technology

    • With corrosion-resistant stainless steel (SS304/SS316), you can ensure long-lasting performance in harsh environments like marine or industrial settings*

  • 2. Interactive Design

    • With a square head design, you can achieve secure fastening in tight spaces using standard wrenches, reducing assembly time compared to hex heads*

  • 3. Performance Parameters

    • With thread sizes ranging from M2 to M8 and lengths up to 25mm, you can accommodate diverse applications requiring precise fitment and structural stability*

  • 4. Scenario Solutions

    • Designed for industrial and construction scenarios, these bolts provide reliable connections in corrosive or high-stress environments, outperforming carbon steel alternatives*

  • 5. Certification Standards

    • With RoHS compliance, you can meet environmental and safety regulations for global projects, ensuring peace of mind in regulated industries*

Product details

A2-70 A2-80 A4-70 A4-80 18-8 SS304 SS316 Stainless Steel Square Head Long Thin Royal L Key Bolt

A2-70/A2-80/A4-70/A4-80 stainless steel square head bolts are engineered for precision and durability. Designed with corrosion-resistant materials like SS304/SS316 and hexagonal heads for secure torque application, these bolts cater to industrial, automotive, and construction applications requiring high tensile strength and environmental resilience.

Technical specifications

FeatureSpecificationBenefit
MaterialStainless Steel (SS304/SS316), Carbon Steel, BrassCorrosion resistance, high tensile strength
Thread SizeM2, M3, M6, M8Compatibility with standard nuts/threaded holes
Head TypeSquare HexagonalEnhanced wrench grip for tight spaces
Length25mm (customizable lengths available)Adaptable for varied assembly depths
Surface TreatmentPolishedSmooth finish for reduced friction
CertificationRoHS-compliantMeets global environmental safety standards

Customization guide

Adjustable parameters:

  • Length: Tailor bolt length to fit specific assembly depths (e.g., 10–50mm).
  • Thread Size: Select from M2–M8 to match component requirements.
  • Material Grade: Choose between A2-70 (general use), A4-80 (high strength), SS304 (corrosion-resistant), or SS316 (marine/chemical environments).

Get inspired

With SS316-grade stainless steel, you can ensure resistance to harsh chemicals and saltwater corrosion. The hexagonal head design enables precise torque control, while polished surfaces reduce wear in high-friction applications.

Choose your model

ParameterBase Model (A2-70)Advanced Model (A4-80)Pro Model (SS316)
Material GradeCarbon SteelHigh-Strength SteelSS316 Stainless
Tensile Strength400 MPa+15% (460 MPa)+30% (520 MPa)*
Corrosion ResistanceStandardImproved3x industry benchmark
Surface FinishMattePolishedPremium polished

Supplier's note

  1. Technical Breakthroughs:

    • Material Upgrades: SS316 in Pro models offers triple the corrosion resistance of base grades, ideal for marine/chemical plants.
    • Thread Strength: A4-80 alloys provide 15% higher tensile strength than A2-70, enabling use in heavy machinery.
    • Surface Treatment: Premium polished finishes reduce friction by 20%, extending longevity in high-cycle applications.

  2. Optimal Version Selection:

    • Base Model: Suitable for general assembly (e.g., automotive panels) where cost efficiency is prioritized.
    • Advanced Model: Ideal for industrial equipment requiring enhanced load-bearing capacity.
    • Pro Model: Recommended for corrosive environments (e.g., offshore platforms) where durability and chemical resistance are critical.

*Pro model’s 520 MPa tensile strength exceeds industry benchmarks by 30%, ensuring reliability in extreme conditions.

Frequently asked questions

  • Which stainless steel square head bolt model (A2-70/A4-80) is best for corrosive environments?

  • What’s the difference between SS304 and SS316 in square head bolts?

  • How do I maintain stainless steel square head bolts (M2-M8) for longevity?

  • Can these square head bolts be customized for specific lengths (e.g., 25mm)?

  • Are these square head bolts RoHS-certified for electronic assemblies?

  • Which square head bolt (18-8 SS304) suits thin, long hardware applications?

  • Do M2-M8 thread sizes on square head bolts fit standard nuts?

  • What makes these square head bolts suitable for outdoor construction?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Industry Standard BoltGeneral machinery, automotiveMaterial: Steel (ungraded); Tensile strength: 400 MPa (ISO 898-1); Thread size: M6Cost-effective, widely compatible; Passes basic corrosion tests (ASTM A153)Prone to rust in humid environments; Lower strength than graded bolts
A2-70 Carbon Steel BoltLight machinery, automotive partsTensile strength: 600 MPa (ISO 898-1); Thread size: M6; Passivation: OptionalHigher strength than ungraded steel; Affordable; ▲ 50% stronger than Industry StandardRequires coating for corrosion protection; Not for marine/chemical use
A4-80 Stainless Steel BoltMarine equipment, outdoor fixturesMaterial: Stainless steel (A4-80); Tensile strength: 800 MPa (▲ vs A2-70); ASTM A262 corrosion resistance▲ 33% stronger than A2-70; Resists corrosion in mild marine environmentsHigher cost than carbon steel; Not suitable for extreme chemical exposure
SS304 Stainless Steel BoltFood processing, architectural hardwareMaterial: SS304 (ASTM A276); Corrosion resistance: Passes ASTM A262; Tensile strength: 505 MPaWidely used in food-safe applications; ▲ 25% better corrosion resistance than A4-80Fails in chloride-rich environments (e.g., saltwater); Less durable than SS316
SS316 Stainless Steel BoltChemical plants, offshore platformsMaterial: SS316 (ASTM A276); Corrosion resistance: Passes ASTM A262; Tensile strength: 570 MPa▲ 13% stronger than SS304; Resists chloride corrosion (e.g., seawater)Highest cost tier; Heavier than carbon steel; Requires specialized tools
Brass Bolt (C26000)Electrical enclosures, decorative fittingsMaterial: Brass (C26000); Non-magnetic; Thread size: M3; Conductivity: 27% IACSNon-sparking; Resists tarnish in dry environments; ▲ 10% better conductivity than steelLow tensile strength (260 MPa); Prone to galling; Not for high-stress joints

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