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BIS-ISI-CERTIFICATE

IS 5187: 1972

Bolts, Nuts & Fasteners - Flush Bolts

Bolts, Nuts & Fasteners - Flush Bolts
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1. Summary about Flush Bolts

Flush bolts are door hardware components used to secure inactive leaves of double doors. They are commonly installed in residential, commercial, and institutional buildings for controlled door operation.


2. Why BIS Certificate is Mandatory for Flush Bolts

BIS certification is mandatory to ensure strength, smooth operation, and durability. Inferior flush bolts can jam, break, or compromise door safety.


3. What is BIS Certified for Flush Bolts

BIS certification confirms compliance with Indian Standards covering material strength, dimensional accuracy, surface finish, and operational reliability.


Tests required for Flush Bolts

TitleMandatory/Optional
Raw Material

Optional

Manufacture and Construction

Required

Dimensions

Required

Workmanship and Finish

Required

Thickness

Required

Quality of sealing

Optional

Colour and appearance

Required

Corrosion resistance

Required

Required

Required

Resistance to crazing by deformation

Required

Fastness to light

Optional

Light reflection properties

Optional

Required

Optional


4. Benefits of BIS Certification for Flush Bolts

  • Ensures smooth and reliable door locking
  • Mandatory for compliant building hardware
  • Improves durability under repeated use
  • Reduces risk of hardware failure
  • Enhances acceptance in construction projects

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