Door Handles for Mortice Locks – Specification — IS 4992 (2024) Testing

IS 4992:2024 covers door handles used for mortice locks, including lever door handles and door knobs. It specifies relevant requirements for design, construction, performance and classification to support reliable operation of mortice locks.

The standard covers lever door handles and door knobs intended for mortice locks. It also includes provisions related to handle cover plates and rosettes, helping define product designs and components within the scope of the standard.

BIS laboratory requirements include evaluation of fastening elements and spindle, axial strength, preload, permanent deformation, safety requirements, durability testing through specified cycles, corrosion resistance and marking. Fire-resistance testing may apply according to the product classification.

Yes. Fire resistance is included in the six-digit classification system of IS 4992:2024. The applicable fire-resistance requirement depends on the classification declared for the door handle, and BIS testing scope separately identifies fire-resistance testing provisions.

IS 4992:2024 uses a six-digit coding system to classify door handles based on category of use, durability, test door mass, fire resistance, corrosion resistance and type of operation. This system helps identify the intended performance level of a product.

Yes. IS 4992:2024 is the second revision of the standard and replaced IS 4992:1975. BIS issued implementation guidelines requiring transition to the revised standard, with the old standard scheduled for withdrawal after 14 May 2025.

The BIS Product Manual for IS 4992:2024 states that certification is operated under Scheme-I of the BIS Conformity Assessment Regulations, 2018. The manual serves as reference material for applicants, licensees and BIS offices for certification activities.

Manufacturers of door handles designed for mortice locks should assess their products against IS 4992:2024 requirements where BIS certification applies. Testing helps establish conformity with applicable performance, safety, durability, corrosion and marking requirements. Certko can assist with coordinating applicable product testing.