Specification For Fire Hooks
1981 Edition

Scope of IS 927 and Essential Specifications

• Scope: Defines requirements for bamboo handles used in fire hooks, ensuring compliance with quality and size standards.

• Handle Material & Minimum Length:

  • Constructed from bamboo
  • Length not less than 3 meters (Clause 2.2)

• Shape & Dimension Compliance:

  • Must match the profile and measurements specified in Figure 1 (Clause 3.1)
  • (Refer to IS 927 Fig. 1 for exact design details)

• Rounding off Results:

  • Testing outcomes must be rounded following IS 2-1960 guidelines
  • Number of significant figures in rounded data equals that in the standard’s specified values (Clause 0.3)

Summary Table

Rounding Procedure (IS 2-1960)

• Test results must be rounded with the same significant figure count as the specification.
• Example: For a specified value of 3.00 (3 significant digits), the test result should be rounded to 3 significant digits.

flowchart TD
    A[Begin: Test Measurement] --> B{Determine Significant Figures}
    B --> C[Round to Matching Figures]
    C --> D[Compare Rounded Value with Standard]
    D --> E{Complies?}
    E -->|Yes| F[Accept Result]
    E -->|No| G[Reject Result]

Refer to Figure 1 in IS 927 for detailed shape and size specifications.

Material Specifications According to IS 927

• Handle (Clause 2.2):

  • Material: Bamboo
  • Minimum length: 3 meters

• Hook Head Steel (Clause 2.1):

  • Material: Forged medium carbon steel
  • Standard Reference: IS 2004-1978
  • Hardness Range: 350 to 450 HV (Vickers Hardness)

• Rounding of Numerical Data (Clause 0.3):

  • Numerical values must adhere to rounding rules outlined in IS 2-1960.
  • The number of significant digits should match the standard’s specifications.

Material Summary

Reference Diagram (Figure 1: Shape & Dimensions)

graph LR
A[Handle (Bamboo)] --> B[Hook Head (Forged Steel)]
B --> C[Dimensions as per Figure 1]

See Figure 1 in IS 927 for exact dimensional details.

Fire Hook Shape and Dimensions as per IS 927

• Clause 3.1: The form and measurements must strictly follow Figure 1 in IS 927, representing the standardized fire hook design.

• Handle Length: Bamboo handle must be at least 3 meters long (Clause 2.2).

• Rounding Guidelines: Dimension and test results should be rounded in accordance with IS 2-1960, preserving the same number of significant digits as specified.

Typical Measurements (from Figure 1, IS 927):

Additional Notes:

• Material: Medium carbon steel forging as per relevant IS codes.
• Craftsmanship: Smooth finishing, absence of sharp edges, proper forging.

flowchart LR
    A[Bamboo Handle ≥ 3m] --> B[Carbon Steel Hook]
    B --> C[Design as per Figure 1]
    C --> D[Compliance with IS 927 Dimensions]

Refer to Figure 1 in IS 927 for comprehensive shape and dimensional details.

IS 927 Requirements for Workmanship and Finishing

• Design & Dimensions: Must conform exactly to the layout in Figure 1 (Clause 3.1).
• Forging Quality (Clause 4.1):
  • Must be free from cracks, seams, burrs, and surface imperfections.
  • Edges should be properly shaped and finished as per Figure 1.
• Handle Specifications (Clause 2.2):
  • Constructed from bamboo with a minimum length of 3 meters.
• Rounding of Test Data (Clause 0.3):
  • Numerical test results should comply with IS 2-1960 rounding rules, maintaining consistent significant digits.

Summary Table: Craftsmanship Criteria

These criteria ensure the fire hook's reliability, safety, and conformity with IS 927.

Performance Testing Guidelines for Fire Hooks as per IS 927

• Rounding of Test Results (Clause 0.3):
  Test values must be rounded following IS 2-1960 standards, preserving the same number of significant figures as the specified values.

• Material and Finish Standards (Clauses 1.1, 4.2):
  Hooks must comply with specified criteria for materials, shape, dimensions, workmanship, surface finish, and functional performance.

  • The hook head should be coated with anti-corrosive paint (IS 1404-1970), except for the piercing edges which must be left bright and lacquered.

• Shape and Dimensions (Clause 3.1):
  Must adhere to the design depicted in Figure 1 (not shown here).

Performance Test Parameters

Example of Rounding (IS 2-1960):

flowchart TD
    A[Sample Fire Hook] --> B{Dimension Check}
    B -- Within Tolerance --> C[Apply Anti-Corrosive Paint]
    B -- Out of Tolerance --> D[Reject Sample]
    C --> E[Conduct Strength and Performance Tests]
    E --> F{Test Outcome}
    F -- Pass --> G[Accept Sample]
    F -- Fail --> D

Summary: IS 927 enforces strict adherence to shape, surface finish, corrosion protection, and precise rounding in test results to maintain fire hook quality.

Marking Instructions for Fire Hooks (IS 927)

• ISI Certification Mark (Clause 6.1.1):

  • Fire hooks can bear the ISI mark indicating conformity to IS 927 and quality control under ISI supervision.
  • Use of the ISI mark is regulated by the Indian Standards Institution (Certification Marks) Act.

• Rounding of Values (Clause 0.3):

  • Test results must be rounded in accordance with IS 2-1960, preserving the same significant digits as specified.

• Dimensions & Tolerances:

  • Fire hook dimensions follow Figure 1.
  • Handle cross-section: 20 mm × 10 mm ± 0.5 mm (Amendment 2, 2007).
  • Handle length: minimum 3 meters bamboo (Clause 2.2).
  • Tolerances conform to IS 2102 (Part 1)-1980 for coarse class general tolerances (Amendment 1, 1984).

Summary Table: Marking and Dimension Details

flowchart LR
    A[Fire Hook] --> B[Handle: Bamboo, ≥3 m]
    B --> C[Cross-section: 20x10 mm ± 0.5 mm]
    A --> D[ISI Mark (Optional)]
    A --> E[Dimensions per Figure 1]
    E --> F[Tolerances per IS 2102 (Part 1)]
    G[Rounding of Test Results] --> H[IS 2-1960 Standard]

For precise dimension details, consult Figure 1 in IS 927.

Tolerance Information Overview (IS 927)

IS 927 does not explicitly provide comprehensive tolerance tables or formulas in the clauses provided. Key tolerance-related points include:

• Rounding Off (Clause 0.3):
  Test values should be rounded following IS 2-1960, keeping the same number of significant digits as specified.

• Handle Length (Clause 2.2):
  The bamboo handle must be at least 3 meters in length.

• Shape and Dimensions (Clause 3.1):
  Must strictly conform to the specified shape and size in Figure 1.

General Notes on Tolerances (Engineering Best Practices)

• Dimensional tolerances generally depend on manufacturing methods and material properties.
• For bamboo handles, a typical length tolerance might be ±5 cm as a practical guideline.
• Rounding procedures per IS 2-1960 ensure standardization in reporting measurements.

Rounding Rules Summary (IS 2-1960)

For detailed tolerance values relevant to dimensions or surface finish, consult related IS standards on forging or bamboo materials.

Summary of Amendments to IS 927

• Rounding of Numerical Data (Clause 0.3):
  All final test results must be rounded according to IS 2-1960 rules, maintaining the same number of significant digits as required by IS 927. This ensures uniformity and precision in compliance evaluation.

• Handle Specifications (Clause 2.2):

  • Material: Bamboo
  • Minimum length: 3 meters

• Shape and Dimension Details (Clause 3):

  • Exact shape and sizing are outlined but not reproduced here; refer to IS 927 for comprehensive information.

Rounding Rules Overview (IS 2-1960)

For the latest updates, always consult the official IS 927 document and its corrigenda.