IS 8756:1978 is the Indian Standard (BIS) for mortice ball catches for use in the wooden almirah. This standard specifies the material, dimensional, manufacturing, and performance requirements for mortice-type ball catches. These catches are designed to be installed in wooden almirahs and other similar cabinetry to hold doors in the closed position.
Specification for mortice ball catches for use in the wooden almirah
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Endurance Test | 10,000 cycles of operation | 25,000 to 100,000 cycles, depending on grade | ANSI/BHMA A156.9 |
| Holding Force | Must withstand a pull of 2.5 kgf (approx. 24.5 N) | Typically 45 N to 90 N (10-20 lbf) depending on type and grade | ANSI/BHMA A156.9 |
| Material Specification | Prescribed: Brass, Mild Steel, Spring Steel for specific parts | Performance-based: Any material that meets strength, durability, and corrosion tests is acceptable | ANSI/BHMA A156.9 |
| Corrosion Resistance | Specifies nickel-chromium plating as per IS 1068 | Specifies performance in a salt spray test (e.g., 24-96 hours depending on material and finish) | ANSI/BHMA A156.9 |
| Dimensional Specification | Prescribes specific dimensions for 3 standard sizes | Not specified; dimensions are manufacturer-defined to meet performance criteria | ANSI/BHMA A156.9 |
| Performance Grading | Single level of acceptance | Graded system (e.g., Grade 1, 2, 3) for different duty levels | ANSI/BHMA A156.9 |