Specification for hat, coat and wardrobe hooks

IS 9899: Scope - Key Specifications & Tables

1. Scope Overview:

   • Covers hat, coat, and wardrobe hooks.
   • Specifies minimum sizes, materials, and conformity criteria.

2. Minimum Size & Dimensions (Clause 4.1):

3. Material Specifications (Clause 2.1, Table 1):

4. Conformity Sampling (Clause A-4.1, Table 2):

Summary:

• Hooks must be at least 50×30 mm, with 2 mm back plate thickness and 4 mm hook diameter.
• Materials must conform to specified IS grades for strength and durability.

IS 9899 Key References:

1. Hook Size & Dimensions (Clause 4.1)

• Minimum hook size: 50×30 mm
• Back plate thickness: 2 mm
• Hook diameter: 4 mm
• Screw holes: 2

2. Materials (Clause 2.1, Table 1)

3. Sampling & Conformity (Clause A-4.1, Table 2)

4. Additional Notes

• Rounding off values per IS:2-1960.
• This standard is part of a series on builder's hardware (see referenced IS codes for related items).

IS 9899 - Design & Construction: Key Specifications

1. Materials (Clause 2.1, Table 1)

Materials for hat, coat, wardrobe hooks must comply with:

2. Dimensions & Design (Clause 4.1, Table 4)

• Minimum hook size: 50×30 mm
• Back plate thickness: ≥ 2 mm
• Hook diameter: ≥ 4 mm
• At least 2 screw holes for secure fixing

3. Quality Control (Clause A-4.1, Table 2)

Summary Diagram: Hook Design Parameters

graph LR
A[Back Plate] -->|Thickness ≥ 2 mm| B[

IS 9899 - Size and Dimensions of Hooks

Key Specifications (Clause 4.1 & 4.1.1)

• Minimum size of hooks: 50 mm (height, A) × 30 mm (projection, B)
• Back plate thickness: Minimum 2 mm
• Minimum diameter of hook (d): 4 mm
• Minimum number of screw holes for Wood Screw No. 6: 2

• Designation: Size is designated by overall height (A) × overall projection (B).
• Hook shapes per Fig. 1 & 2 are illustrative; alternative shapes allowed if agreed.

Materials (Clause 2.1)

flowchart LR
    A[Hook Size] -->|Height (A)| B[50 mm]
    A -->|Projection (B)| C[30 mm]
    A -->|Thickness of Back Plate| D[2 mm]
    A -->|Hook Diameter (d)| E[4 mm]
    A -->|Screw Holes| F[2 holes for Wood Screw No. 6]

Summary: Use minimum 50×30 mm hooks with 2 mm back plate thickness,

IS 9899 - Key Material Specifications for Hooks

1. Materials and Suitable Grades (Clause 2.1, Table 1)

* IS references relate to specific material standards for hot-rolled steel, brass, aluminium alloys, etc.

2. Minimum Size and Dimensions of Hooks (Clause 4.1, Table 4)

3. Sampling and Quality Conformity (Clause 4.1, Table 2)

Notes:

• Use of non-ferrous materials (copper, zinc alloys) is discouraged for indigenous use due to scarcity but retained for export.
• Minimum hook size is 50×30 mm with specific thickness and hole requirements

IS 9899: Finish - Key Specifications and Tables

1. Materials (Clause 2.1, Table 1)

Materials for hat, coat, and wardrobe hooks must comply with:

2. Size & Dimensions (Clause 4.1, Table 4)

3. Marking (Clause 7.1)

• Each hook must be clearly and permanently marked with the manufacturer's name or trade-mark.

Summary:

• Use specified IS grades for materials.
• Minimum hook size: 50×30 mm, thickness: 2 mm, hook diameter: 4 mm.
• Hooks must have 2 screw holes for wood screws No. 6.
• Permanent marking of manufacturer/trade-mark is mandatory.

flowchart TD
    A[Materials] --> B{Select Material}
    B -->|Mild Steel| C[IS 1079-1973]
    B -->|Brass Sheet| D[IS 410-1977]
    B -->|Cast Brass| E[IS 292-1961]
    B -->|Aluminium Sheet| F[IS 737-1974]
    B -->|Aluminium Die Casting| G[

IS 9899 — Marking & Specifications for Hooks

Marking (Clause 7.1 & 7.1.1)

• Each hook must be clearly and permanently marked with:
  • Manufacturer's name or trade-mark.
  • Optionally, the ISI Certification Mark (subject to ISI regulations).
• ISI Mark ensures compliance with quality and inspection standards.

Materials (Clause 2.1, Table 1)

Size & Dimensions (Clause 4.1, Table 4)

Summary Diagram

flowchart TD
    A[Hook] --> B[Marking]
    B --> C{Mandatory}
    C -->|Manufacturer's name/trademark| D[Permanent Mark]
    C -->|Optional| E[ISI Certification Mark]
    A --> F[Material]
    F --> G[Mild Steel, Brass, Aluminium Alloys]
    A --> H[Dimensions]
    H --> I[Min Size 50x30 mm]
    H --> J[Thickness 2 mm]
    H --> K[Hook Dia 4 mm]
    H --> L[2 Screw Holes]

Key Takeaway: Hooks

IS 9899: Sampling and Criterion for Conformity (Appendix A)

1. Lot Definition

• All hooks of same shape, size, material, and manufacturing batch form a lot.

2. Sampling

• Hooks are selected from the lot as per sampling plan (Clause A-2).
• Sample size depends on lot size (refer IS 2500 or IS 4905 for detailed sampling tables).
• Hooks are checked for:
  • Dimensional requirements (Clause 4)
  • Manufacture quality (Clause 5)
  • Finish (Clause 6)

3. Defect Criterion

• Any hook failing any requirement is defective.
• The lot is accepted if the number of defective hooks ≤ Acceptance Number (Ac).
• If defective hooks > Ac, lot is rejected.

4. Typical Sampling Table (Example)

Note: Use the exact table from Appendix A or relevant IS standards for precise values.

flowchart TD
    A[Lot of Hooks] --> B[Select Sample]
    B --> C{Check Hooks}
    C -->|Pass| D[Count Defects = 0]
    C -->|Fail| E[Count Defects > 0]
    D --> F{Defects ≤ Ac?}
    E --> F
    F -->|Yes| G[Accept Lot]
    F -->|No| H[Reject Lot]

Summary: Sampling ensures quality by testing a representative subset; acceptance depends on defect limits per IS 9899 Appendix A.

IS 9899 Appendix A: Method of Selecting Hooks & Conformity Criteria

Sampling & Selection (Clause A-2.1)

• Number of hooks selected depends on lot size.
• Sample size and permissible defective hooks are per Table 2 below.

Table 2: Scale of Sampling & Criterion for Conformity

Conformity Criterion (Clause A-4.1)

• A lot conforms if defective hooks ≤ permissible number in Table 2.
• Hooks failing dimensional, manufacturing, or finish requirements are defective.

Summary:

• Select sample size based on lot.
• Test for dimensions, manufacture, finish.
• Accept lot if defective hooks ≤ permissible limit.

flowchart TD
    A[Select Lot Size] --> B[Determine Sample Size (Table 2)]
    B --> C[Test Hooks for Dimensional & Quality Requirements]
    C --> D{Number of Defective Hooks ≤ Permissible?}
    D -- Yes --> E[Lot Accepted]
    D -- No --> F[Lot Rejected]

This method ensures quality control by statistically sampling hooks and setting clear acceptance criteria.