steel bookcases
1983 Edition

Scope Summary - IS 7761:1983

Scope: Defines the essential dimensions, material quality, and construction requirements for steel bookcases.

1. Dimensions (Clause 3.1)

• These are the external overall measurements.
• Refer to Figure 1 in the standard for layout details.

2. Material and Fabrication Details

• Back panel thickness: Not less than 1.0 mm steel sheet, spanning entire cabinet width (Clause 4.3).
• Surfaces should be free from burrs, dents, and sharp edges (Clause 6.1.1).
• Components undergo pickling, scrubbing, and rinsing to eliminate contaminants.

3. Marking Details (Clause 10.1.1)

• Optional ISI Certification Mark to indicate compliance and quality assurance.

4. Units of Measurement

• All measurements and physical properties utilize the SI system (meters, kilograms, seconds).
• Pressure and stress in Pascals (Pa = N/m²).
• Force measured in Newtons (N = kg·m/s²).

Structural Diagram of Steel Bookcase

graph TD
    A[Top Panel] --> B[Side Panels]
    B --> C[Bottom Panel]
    C --> D[Back Panel (1.0 mm thick)]
    B --> E[Shelves]
    style D fill:#f9f,stroke:#333,stroke-width:2px

References

• IS 7761 - 1983
• Relevant Indian Standards for materials and welding.

Material Criteria & Relevant Standards (IS 7761)

1. Thickness and Quality Requirements

• The back panel must be at least 1.0 mm thick steel sheet, devoid of burrs or dents.
• Steel bars and flats should conform to mild steel grade Fe 310-0 (St 32-0), as specified in IS:1977-1975, IS:1731-1971, and IS:1732-1971.

2. Dimensional Details

• The back panel width equals the cabinet width, extending from top to bottom.
• Steel rounds and flats adhere to IS specified dimensions.

3. Material Standards Cited

• Structural steel of ordinary quality (Second Revision).
• Cold rolled and hot rolled carbon steel sheets (Second and Third Revisions).
• Slotted countersunk head screws (Third Revision).

4. Testing Protocol

• Stripping test conducted on mild steel plates measuring 150×50 mm with 0.315 mm thickness, per IS:101-1964, ensuring scratch edges are smooth and free of jaggedness.

SI Units for Material Properties

Material Specification Flow

graph TD
  A[Steel Material] --> B[Grade Fe 310-0 (St 32-0)]
  A --> C[Thickness ≥ 1.0 mm]
  A --> D[Surface: No burrs or dents]
  B --> E[Complies with IS:1731 & IS:1732]
  F[Testing] --> G[Stripping Test as per IS:101]
  G --> H[Scratch edges smooth]

Refer to IS:1731, IS:1732, and IS:197 for detailed mechanical and dimensional data.

IS 7761 - Steel Bookcase Dimensions and Tolerance Guidelines

1. Principal Dimensions (Clause 3.1)

2. Acceptable Tolerances (Clause 3.2)

• Dimensions may vary within ±5 mm.

3. Back Panel Details (Clause 4.3)

• Thickness ≥ 1.0 mm steel sheet.
• Width matches cabinet width (840 mm).
• Quality: free from burrs or dents.

4. Screw Specifications (Clause 2.4)

• Must meet IS 1365-1978 and IS 1366-1968.

Dimension Summary Table

flowchart LR
    A[Steel Bookcase Dimensions] --> B[Height: 1675 mm]
    A --> C[Width: 840 mm]
    A --> D[Depth: 305 mm]
    A --> E[Tolerance: ±5 mm]
    F[Back Panel] --> G[Thickness ≥ 1.0 mm]
    F --> H[Width = 840 mm]
    F --> I[No burrs or dents]
    J[Screws] --> K[IS 1365-1978]
    J --> L[IS 1366-1968]

These ensure adherence to IS 7761 dimensional and material requirements.

IS 7761 - Structural Construction Details for Steel Bookcases

Essential Details and Dimensions

• Back Panel:

  • Minimum thickness: 1.0 mm steel sheet without burrs or dents.
  • Width equal to cabinet width (840 mm).
  • Extends fully from top to bottom.

• Overall Cabinet Size (Clause 3.1):

• Sheet Metal Components (Clause 6.1):
  • All burrs, dents, and sharp edges must be removed.
  • Parts are cleaned by pickling, scrubbing, and rinsing to remove grease, rust, and scales.

Related Material Standards

• Structural steel sheets (cold rolled and hot rolled carbon steel as per IS).
• Fasteners: slotted countersunk head screws.
• Welding: methods for mild steel including oxy-acetylene, metal arc, and resistance spot welding.

Steel Bookcase Dimension Overview

graph TD
  A[Top Surface] --> B[Back Panel (1.0 mm thick)]
  B --> C[Bottom Surface]
  style B fill:#f9f,stroke:#333,stroke-width:2px
  D[Width = 840 mm]
  E[Height = 1675 mm]
  F[Depth = 305 mm]

This guarantees structural soundness, precise dimensions, and quality surface preparation as per the standard.

IS 7761 - Assembly Guidelines for Steel Bookcases

1. Sheet Metal Components (Clause 6.1)

• Use steel sheet backs with a minimum thickness of 1.0 mm.
• Back width should be equal to cabinet width (840 mm).
• Back panel extends the entire height (1675 mm) between top and bottom.
• Remove all burrs, dents, and sharp edges.
• Clean parts thoroughly by pickling, scrubbing, and rinsing to eliminate grease, rust, and scale.

2. Dimensions and Tolerances (Clause 3.1)

3. Material Standards

• Ordinary-grade structural steel sheets (both cold and hot rolled).
• Steel bars and flats compliant with relevant IS specifications.
• Assembly hardware includes slotted countersunk head screws.
• Welding per IS standards for oxy-acetylene, metal arc, and spot welding.

Assembly Process Flow

flowchart TD
    A[Cut Steel Sheets] --> B[Remove Burrs and Dents]
    B --> C[Pickling and Cleaning]
    C --> D[Form Components]
    D --> E[Assemble with Screws or Welding]
    E --> F[Final Inspection and Finishing]

This process ensures structural integrity and compliance with IS 7761.

IS 7761: Surface Treatment and Finishing Guidelines

1. Phosphating Process

• After pickling, mild steel parts must undergo phosphating treatment conforming to Class C of IS:3618-1966.
• The application procedure follows IS:6005-1970 standards.
• This process provides corrosion resistance by forming a phosphate coating.

2. Paint and Primer Specifications

• Putty application: As per IS:110-1968 to fill surface imperfections.
• Aluminium primer: According to IS:5660-1970.
• Paint options include ready-mixed enamel paints, aluminium red oxide primers, spraying and stoving enamels, and exterior enamel undercoats and finishes.

3. Stripping Test (Clause 7.4)

• Test samples: 150×50 mm mild steel plates of 0.315 mm thickness.
• Conducted as per IS:101-1964 (Clause 17).
• Scratch edges must be smooth without jagged fragments.

Surface Treatment Standards Summary

flowchart LR
    A[Pickling] --> B[Phosphating Treatment (IS:3618)]
    B --> C[Putty Application (IS:110)]
    C --> D[Primer Coating (IS:5660)]
    D --> E[Painting and Finishing]
    E --> F[Stripping Test (IS:101)]

This ensures corrosion resistance and surface finish durability as per IS 7761.

IS 7761: Finish Performance Specifications

1. Finish Requirements (Clause 6.2):

• All parts should have a color finish mutually agreed upon by the purchaser and manufacturer.

2. Stripping Test (Clause 7.4):

• Sample size: 150 mm × 50 mm, thickness 0.315 mm.
• Testing follows IS 101-1964, Clause 17.
• Scratch edges post-test must be free from jaggedness.

3. Paint and Protective Treatments:

• Phosphating for corrosion resistance as per IS 3618.
• Paint types include:
  • Ready mixed enamel paint with brushing and grey filler.
  • Aluminium red oxide primer.
  • Spraying, finishing, and stoving enamels.
  • Exterior enamel undercoating and finishing layers.
• Enamel coatings comply with IS 151-1950, IS 2932-1974, or IS 2933-1975.

4. Order Specifications (Clause 8.1):

• Purchasers must specify:
  • Desired finish colour.
  • Any alternative construction or finishing methods.

Stripping Test Summary

flowchart LR
    A[Component] --> B[Surface Preparation]
    B --> C[Phosphating Treatment]
    C --> D[Primer Coating]
    D --> E[Enamel Paint Application]
    E --> F[Stripping Test]
    F --> G{Jagged Edges?}
    G -- No --> H[Pass]
    G -- Yes --> I[Fail]

Refer to relevant IS codes for detailed painting and finishing procedures.

IS 7761 - Required Technical Details from Purchaser (Clause 8)

When placing an order, purchasers must provide:

• Finish colour: Exact colour specification for the product.
• Optional methods: Indicate if alternative construction or finishing techniques are acceptable.

Additional Specifications

• Back Panel (Clause 4.3):

  • Steel sheet with minimum thickness of 1.0 mm.
  • Free from burrs and dents.
  • Width equal to cabinet width, covering full height.

• Corrosion Resistance Test (Clause 7.5):

  • Sample size: 150 mm × 100 mm, thickness 1.25 mm.
  • Tested for condensation corrosion as per IS 101-1964.
  • No corrosion tolerated after test.

Summary Table of Purchaser Info

This information ensures clarity and quality assurance during procurement.

flowchart TD
    A[Purchaser submits order] --> B{Technical Data Provided?}
    B -- Yes --> C[Colour Specification]
    B -- Yes --> D[Construction/Finish Options]
    C & D --> E[Order Processing]
    B -- No --> F[Order Incomplete - Possible Delay]

Packaging Guidelines as per IS 7761 for Steel Bookcases

Key Dimensions (Clause 3.1):

Material Specifications (Clause 4.3):

• Back panel thickness: minimum 1.0 mm steel sheet.
• Back panel width equals cabinet width (840 mm).
• Back sheet must be free of burrs and dents.
• Back panel extends fully from top to bottom surfaces.

Marking (Clause 10.1.1):

• Steel bookcases may carry the ISI certification mark confirming compliance with Indian Standards.
• The ISI mark assures quality, inspection, and testing adherence.

Packaging and Marking Summary

• Proper steel thickness and dimensions support structural integrity during packaging and transit.
• ISI marking guarantees conformity and quality.
• Packaging must effectively protect against physical damages, especially to the back panel.

flowchart TD
    A[Steel Bookcase] --> B[Dimensions: 1675×840×305 mm]
    A --> C[Back Panel: ≥1.0 mm Steel]
    C --> D[Free from Burrs and Dents]
    A --> E[ISI Certification Mark]
    E --> F[Quality Assurance]

For detailed packaging practices, refer to ISI licensing and inspection regulations.

IS 7761 - Marking Requirements for Steel Bookcases (Clauses 10.1 & 10.1.1)

Main Points:

• Manufacturer Identification:

  • Each steel bookcase must be marked with the manufacturer's name and identification number.
  • Keys should display the maker's name and a unique ID number, distinct from key step numbering.
  • Locks must bear the same identification number as their matching keys.

• ISI Certification Mark:

  • The ISI mark may be applied to indicate conformity with relevant Indian Standards, subject to licensing.

Marking Summary Table

Notes on ISI Mark

• The ISI mark confirms product quality under ISI supervision.
• Use of the mark is regulated by licensing terms from the Indian Standards Institution.

Related Standards and Tests

• Stripping test per IS 101-1964 for surface finish evaluation.
• Phosphating treatment for corrosion protection.
• Paint and enamel specifications for primers and finishing coats.

flowchart LR
    A[Steel Bookcase] -->|Mark| B[Manufacturer's Name + ID]
    C[Key] -->|Mark| D[Maker's Name + Unique ID]
    E[Lock] -->|Mark| F[Same ID as Key]
    G[ISI Mark] -->|Optional| A

These marking protocols ensure traceability and compliance with IS standards for steel bookcases.