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BIS-ISI-CERTIFICATE

IS 1363 (Part 3) :2018

Bolts, Nuts & Fasteners - Hexagon Head Bolts, Screws and Nuts of product Grade C – Hexagon Nuts (Size Range M5 to M64)

Bolts, Nuts & Fasteners - Hexagon Head Bolts, Screws and Nuts of product Grade C – Hexagon Nuts (Size Range M5 to M64)
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1. Summary about Hexagon Head Bolts, Screws and Nuts of Product Grade C – Hexagon Nuts (M5 to M64)

Grade C hexagon nuts are general-purpose nuts used with bolts and screws in mechanical and structural assemblies. They are suitable for applications with moderate load requirements.


2. Why BIS Certificate is Mandatory for Grade C Hexagon Nuts

BIS certification is mandatory to ensure thread accuracy, hardness, and load-bearing capability. Inferior nuts can loosen or strip threads, leading to joint failure.


3. What is BIS Certified for Grade C Hexagon Nuts

BIS certification verifies compliance with Indian Standards covering dimensions, thread tolerances, mechanical properties, and surface finish.


Tests required for Grade C Hexagon Nuts (M5 to M64)

TitleMandatory/Optional
Dimensions

Required

Material

Optional

Threads requirement

Required

Stress under proof load

Required

Hardness Test

Required

Surface Integrity inspection

Required

Electroplating

Required

Non - Electrolytically applied zinc flake coating

Required


4. Benefits of BIS Certification for Grade C Hexagon Nuts

  • Ensures secure and reliable fastening
  • Mandatory for compliant industrial use
  • Improves interchangeability with bolts
  • Reduces risk of loosening and failure
  • Builds trust among manufacturers and users

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