ASME B18.3 SOCKET HEAD CAP SCREW

Name: ASME B18.3 Industrial Fastener
Brand: Longze Engineering

ASME B18.3 is structurally analyzed and engineered for high-demand industrial applications. We guarantee permanent retention and flawless, jam-free performance in high-speed automated production lines globally.

LIVE 3D ASSET ASME B18.3

INTERACTIVE MODEL

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Download 3D CAD Model (.GLB) View ASME B18.3 Engineering Data

V-SYSTEM A ASME B18.3

        CEV-1 HASH: 0366230dd4aeddb2db346515fed93ac329b5fc33916e286ac6170a7754061812
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        FROZEN: 2026-05-23 22:09:32
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        ASSET: standard_map_core.csv
    

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Full Specification Matrix →

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Assembly Ecosystem

● SYSTEM INTEGRATED BUNDLE SAVINGS

Complete your fastening system with these matching components. Bulk ordering reduces logistics costs and ensures material consistency.

ASME B18.2.2 ASME B18.21.1

Longze V-SYSTEM: The Single Source of Truth

● FACTORY DIRECT AUDIT

TRANSPARENCY & GLOBAL TRADE GUARANTEE

Global supply chains require trust built on clear accountability. The LZ-Shield protocol defines our commitment to ASME B18.3 quality and the boundaries of international logistics.

LZ-Shield Transparency & Liability Policy

STRICT COMPLIANCE

✔ Our Absolute Responsibility

We are 100% liable for Manufacturing Non-Compliance. If the products deviate from the agreed ISO/DIN standard or your verified TDS, we replace or refund.

The Guardrail: Our liability is capped at the Commercial Invoice Value of the specific defective batch. We do not cover consequential production losses or third-party assembly costs.

✖ Client & Logistics Boundaries

Transit Risks: Responsibility shifts strictly per Incoterms 2020.

For CIF/DDP: We lead the insurance claim process for you.
For FOB/EXW: We provide 100% Visual Evidence Support—including HD photos of inner packing and container loading—to ensure your insurance claims are indisputable.

PROACTIVE INTERVENTION:

Regardless of liability, Eric's team provides 100% technical cooperation to find a solution. We prioritize your production uptime over legal debates.

24H RESPONSE
CLAIMS WINDOW: 15 DAYS

LONGZE Technical Specification & Performance Lab

Advanced Fastener Testing Center & ISO/DIN Standard Compliance Hub

Every batch of Longze fasteners undergoes rigorous validation within our centralized Performance Lab. We go beyond dimensional checks, utilizing spectrometer analysis and real-time salt spray testing to ensure that our ASME B18.3 assemblies meet the most demanding mechanical and anti-corrosive requirements of modern industry.

QUALITY SAFEGUARD Three-Layer Quality Protocol Active

Layer 1 — Material Traceability

Full mill certificate traceability from raw steel to finished product. Every heat number is documented and verifiable.

Layer 2 — Dimensional Integrity

CNC-verified tolerances within ASME B18.3 spec limits. Precision tolerance control within +0.1/-0mm.

Layer 3 — 100% Inspection Protocol

Batch-level dimensional & visual inspection before shipping. Burr-free manufacturing to prevent thread interference.

Customized Fastening Solutions & Drawing Support

Expert OEM/ODM Engineering for Non-Standard ASME B18.3 Assemblies & Components

Hebei Longze specializes in bridging the gap between international standards and complex, site-specific engineering requirements. We analyze your technical drawings—whether CAD, PDF, or 3D models—to provide Free Technical Solutions and feasibility reports within 24 hours, ensuring that every custom fastener optimizes your automated production line's efficiency.

Technical Drawing Analysis

Submit your custom specifications for ASME B18.3 or related components. Our team provides detailed tolerance analysis and material compatibility audits to ensure zero-defect manufacturing.

Tailored System Integration

We design integrated fastening logic for unique industrial environments, offering specialized surface treatments (Zinc-Nickel, Flake Coatings) and rapid prototyping for critical OEM projects.

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SUBMIT YOUR DRAWING

Technical Specifications & Material Data

ASME B18.3 — Precision Engineering Parameters & Compliance Matrix

Testing Capabilities

Material Spectrometer Center

Pre-production chemical element analysis to ensure raw material consistency (Carbon Steel / Stainless Steel).

Mechanical Property Matrix

Hardness testing (HV/HRC) and tensile strength validation ensuring components maintain tension under load.

Surface Endurance Lab

NSS Salt Spray testing up to 1000+ hours for specialized coatings like Zinc-Nickel and Geomet.

Classification & Specs

Series Classification

Small (S): Optimized for reduced head geometry.
Normal (N): The universal standard for industrial assemblies.
Large (L): Maximum load distribution.

Mechanical Specs

Hardness: 200 HV (8.8) / 300-350 HV (10.9+).
Material: Heat-treated Steel / SS304 / SS316.
Standards: Full compliance with ASME B18.3 Class A.

Coating & Compliance

Advanced Coating

Zinc-Nickel Alloy:
1000h+ Salt Spray Resistance. The highest anti-corrosion benchmark for Automotive OEM & Offshore projects.

Standard Compliance

Full compliance with ASME B18.3, ISO 898-1, and ASTM A307. Batch-level certification available upon request.

V-SYSTEM B1 Specification Detail

ASME B18.3 · 1-1/4

                CEV-1 HASH: a0db37c098103a9acce1685c2b7383cc3e66cce72218f6c2b04667f2bdb26b36
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                FROZEN: 2026-05-24 00:43:04
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                ASSET: standard_map_core.csv
            

Parameter	Value
Diameter (Nominal)	31.8
Thread Pitch	—
Head Diameter	47.6 mm
Head Height	31.8 mm
Tensile Strength	827 MPa
Material	Grade 5
Surface	Plain

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