Specification - bath-room latches
1970 Edition

Overview of Bathroom Latch Requirements

Scope (Clause 1.1):

• Defines criteria for material selection, dimensions, and finishing of bathroom latches.

Material Criteria (Clause 3.1 & Table 1):

• Materials must meet specified standards:

Additional Notes:

• Castings must be free from surface defects and blowholes.
• Mild steel bolts require ductility as verified by cold bending.

Illustrative Diagram

Refer to Fig. 1 in IS 5899 for typical latch shape and dimensions (all in millimeters).

Ensures consistent quality and durability in bathroom latch production.

Shape and Size Requirements for Bathroom Latches

Highlights from Clause 2:

• Shape & Size:

  • Bathroom latches can take various shapes and dimensions as agreed upon by manufacturers and purchasers (Clause 2.2).

• Reference Illustration:

  • Typical latch shape and size shown in Fig. 1 (dimensions in mm).

Material Specifications Related to Form

Dimensioning and Rounding

• All measurements are in millimeters.
• Numerical values rounded according to IS 2-1960 (Clause 1.1).

Component Structure Diagram (Mermaid)

graph TD
    Body --> Knob
    Body --> Bolt
    Knob --> Material[Material: Brass/Cast Iron/Aluminium]
    Bolt --> Material

Note: For exact sizes, see Fig. 1 or mutually agreed specifications.

Material Requirements for Bathroom Latches (Clause 3.1, Table 1)

Notes:

• Copper percentage in brass is critical for corrosion resistance and strength.
• Mild steel bolts must demonstrate ductility via cold bend testing.
• All castings must be free from defects such as blowholes.
• Consult related IS standards for detailed mechanical properties.

Manufacturing and Construction Guidelines for Bathroom Latches (IS 5899)

Key Requirements (Clauses 3.1 & 4.1)

• Manufacturing Notes:
  • Knobs should be designed for smooth bolt movement (Clause 4.1).
  • Castings must not have blowholes or surface imperfections.
  • Steel components require ductility testing via cold bend.

Material Property Summary

Additional Notes:

• Follow IS 2-1960 for rounding numerical test values.
• Material grades ensure product durability and smooth operation.
• Reference related IS standards during procurement and quality checks.

Workmanship and Finishing Standards for Bathroom Latches (IS 5899)

Essential Specifications (Clauses 3.1 & 5)

Workmanship Details:

• Knobs must be shaped to facilitate smooth bolt action (Clause 4.1).
• Castings should be free from surface and casting flaws.
• Mild steel bolts undergo cold bend testing to confirm ductility.

Reference Conversion:

• Tensile strength: 1 kg/mm² equals 9.81 MPa.

flowchart TD
    MaterialSelection --> Body
    Body -->|Cast Brass| IS292Grade3
    Body -->|Cast Iron| IS210Grade15
    Body -->|Aluminium Alloy| IS617
    Body -->|Aluminium Extrusions| IS733
    MaterialSelection --> Bolts
    Bolts -->|Brass Cast/Extruded| IS319
    Bolts -->|Mild Steel| IS226

Testing and Compliance Requirements for Bathroom Latches (IS 5899)

Key Standards (Clause 3.1 and Table 1)

• Materials must comply with IS grades:
  • Body:
    • Cast Brass: Copper ≥ 60%, Grade 3, IS 292-1961
    • Cast Iron: Tensile strength ≥ 15 kg/mm², hardness 149-197, Grade 15, IS 210-1962
    • Aluminium Alloy: IS Designation A-5-M or A-6-M, IS 617-1959
    • Aluminium Extrusions: IS Designation HE-9 WP or HE-19 WP, IS 733-1967
  • Bolts and Knobs: Same material criteria as body with specified tensile and copper content.

Testing Requirements

• Material Quality: Must be free from blowholes and surface imperfections.
• Mechanical Properties: Tensile strength and hardness tested per IS grades.
• Ductility: Mild steel components must withstand cold bending without cracking.

Compliance

• Testing should be conducted at laboratories approved by ISI or regional centers listed in the standard.
• Final numerical results must be rounded as per IS 2-1960.

Material Compliance Summary

flowchart TD
    MaterialSelection --> PartType
    PartType -->|Body| BodyMaterial
    PartType -->|Bolts| BoltMaterial
    PartType -->|Knob| KnobMaterial
    BodyMaterial --> Testing
    BoltMaterial --> Testing
    KnobMaterial --> Testing

Marking and Packaging Guidelines for Bathroom Latches (IS 5899)

Although IS 5899 primarily addresses material specifications (Clause 3.1, Table 1), standard practices for marking and packaging typically include:

Marking

• Each latch should bear clear markings of:
  • Manufacturer's identity
  • ISI certification mark (if applicable)
  • Batch or lot number
  • Material grade as per Table 1

Packaging

• Packaging must protect from:
  • Mechanical damage during handling and transit
  • Corrosion or environmental harm during storage
• Use appropriate packaging materials such as sealed boxes and anti-rust paper.
• Labels on packages should state:
  • Product description
  • Quantity contained
  • Manufacturer's name and address
  • Handling instructions

Material Summary from Table 1 (Clause 3.1):

Notes:

• Use IS-approved materials to guarantee durability and performance.
• Proper marking and packaging ensure traceability and product integrity.

flowchart LR
    Manufacturing --> Marking
    Marking --> Packaging
    Packaging --> StorageTransport
    StorageTransport --> Installation