Specification for hold fast
1974 Edition

IS 7196: Holdfast Specification — Scope Overview

• Coverage: Defines dimensions, material criteria, and marking for mild steel holdfasts utilized in construction.
• Material: Mild steel adhering to IS standards.
• Dimensional Details: Provided in Figure 1 of the code, measurements expressed in millimeters.
• Marking: Use of BIS Standard Mark regulated under BIS Act, 1986 (refer Clause 6.2).

Essential Data:

Typical Holdfast Sizes (Referenced from Fig. 1):

• Length approximately 300 mm
• Width and thickness conforming to steel flat sizes outlined in IS 7196 Fig. 1

Additional Remarks:

• Holdfasts serve to securely fix doors and windows.
• Dimensional tolerances and rounding procedures follow IS 7196.
• For manufacturing and certification, Bureau of Indian Standards directives apply.

flowchart LR
    A[Holdfast] --> B{Material}
    B --> C[Mild Steel]
    A --> D{Dimensions}
    D --> E[According to Fig. 1]
    A --> F{Marking}
    F --> G[BIS Standard Mark]

Refer to IS 7196 Fig. 1 and accompanying clauses for detailed dimensions and illustrations.

IS 7196: Material Specifications for Holdfasts

1. Material Requirements

• Holdfasts must be fabricated using mild steel flat bars conforming to IS 1731-1971.
• The steel should be suitable for structural and general engineering applications.

2. Dimensions and Sizes (Clause 3.1)

• Holdfast dimensions are standardized as per Figure 1 in IS 7196.
• All measurements are specified in millimeters (mm).
• Steel flat sizes and dimensional rounding must comply with IS 7196 provisions.

3. Summary of Material Specifications

4. Additional Notes

• Mild steel flats must meet mechanical and chemical properties stipulated in IS 1731.
• Holdfast design ensures robust anchorage in masonry or concrete structures.

Conceptual Illustration of Holdfast Dimensions

graph TD
A[Steel Flat] --> B[Length as per Fig. 1]
A --> C[Width as per Fig. 1]
A --> D[Thickness as per IS 1731]

For precise dimension details, consult Figure 1 in IS 7196.

Summary: Employ mild steel flats conforming to IS 1731, dimensioned following IS 7196 Figure 1, to ensure compliance with size and mechanical property requirements for holdfasts.

IS 7196: Dimensional Requirements for Mild Steel Holdfasts

• Material: Mild steel flat bars as per IS 1731-1971.
• Dimensions: All sizes are expressed in millimeters.
• Reference Diagram: Figure 1 in IS 7196 illustrates the detailed size and shape.
• Typical Dimensions (from Figure 1):
  • Flat length: L (varies according to design)
  • Flat width: b (standard widths from IS 1731)
  • Thickness: t (per IS 1731)
  • Bend radius and hole diameters specified in drawings.

Standard Sizes for Steel Flats (per IS 1731):

• Rounding: Dimensions rounded according to IS 2:1960 norms.
• Marking & Licensing: BIS Standard Mark use controlled under BIS Act, 1986 (Clause 6.2).

Conceptual Dimensional Diagram

graph TD
A[Mild Steel Flat] --> B[Length (L)]
A --> C[Width (b)]
A --> D[Thickness (t)]
A --> E[Bend Radius]
A --> F[Hole Diameter]

Refer to Figure 1 of IS 7196 and IS 1731 for accurate flat sizes.

Though IS 7196 does not explicitly outline detailed manufacturing quality tables or formulas, standard engineering practice and related IS codes provide the following guidance:

Manufacturing Quality Essentials:

• Material: Mild steel flats must comply with IS 1731-1971.
• Dimensional Tolerances: Holdfast sizes and tolerances must conform to IS 7196 specifications.
• Marking: Employ the Standard Mark as per BIS Act, 1986 (Clause 6.2).
• Testing: Mechanical tests such as tensile, bend, and impact tests must be performed to verify quality.
• Surface Condition: Should be free from defects like cracks, rust, or scale.

Quality Control Procedures:

• Visual inspection for dimension accuracy.
• Mechanical testing per IS 1608 (tensile), IS 1599 (bend), and IS 1609 (hardness).
• Certification and marking aligned with BIS guidelines.

Sample Quality Control Table

flowchart TD
    A[Raw Mild Steel Flats] --> B[Cutting and Shaping]
    B --> C[Dimension Inspection]
    C --> D[Mechanical Testing]
    D --> E{Pass Quality Tests?}
    E -- Yes --> F[Marking and Packaging]
    E -- No --> G[Rework or Reject]

Summary: Adherence to IS 1731 for materials, IS 1608/1599 for mechanical testing, and IS 7196 for dimension and marking ensures manufacturing quality of holdfasts.

IS 7196 (1974) does not provide explicit clauses on surface treatment of holdfasts, but the following are standard practices for mild steel holdfasts:

Typical Surface Treatments:

• Corrosion Protection: Hot-dip galvanizing or zinc plating in accordance with IS 4759.
• Painting: Application of anti-corrosive primers followed by enamel or synthetic enamel paint.
• Surface Preparation: Cleaning to remove oil, grease, and rust prior to treatment.

Key Details:

• Hot-dip galvanizing thickness should be at least 50 microns as per IS 2629.
• Paint coatings: Primer ~25 microns; finishing coat ~40 microns.
• Surface cleaning methods include abrasive blasting or wire brushing to enhance paint adhesion.

Summary Table:

For comprehensive surface treatment procedures, consult IS 4759 and IS 2074.

flowchart LR
    A[Holdfast Steel] --> B[Surface Cleaning]
    B --> C[Surface Treatment]
    C --> D[Hot-dip Galvanizing]
    C --> E[Zinc Plating]
    C --> F[Painting (Primer and Finish)]

This treatment ensures enhanced durability and resistance to corrosion for holdfasts used in construction.

Marking Provisions per IS 7196 (Clause 6)

Important Points:

• Clause 6.1: Each holdfast must bear a clear, permanent mark indicating the manufacturer's name or trademark.

• Clause 6.1.1: The holdfast may also carry the BIS Standard Mark, subject to licensing.

• Clause 6.2: Use of the Standard Mark is regulated by the Bureau of Indian Standards Act, 1986. License to use the mark must be obtained from BIS.

Marking Summary Table

Additional Information:

• Markings must endure handling and environmental exposure.
• Licensing and marking details are available from BIS regional offices (refer clause 6.2).

flowchart LR
    A[Manufacturer] --> B[Mark Name/Trademark]
    B --> C{Apply for Standard Mark License?}
    C -->|Yes| D[BIS Licensing Authority]
    C -->|No| E[Marking Completed]
    D --> F[Use Standard Mark]
    F --> E

For licensing specifics, consult BIS offices as specified in Clause 6.2.

Though IS 7196 (1974) does not explicitly cover testing and compliance steps, standard IS code practices and BIS guidelines apply:

Key Points:

• Standard Mark Licensing (Clause 6.2):

  • Governed by Bureau of Indian Standards Act, 1986.
  • Manufacturers must obtain a license from BIS to use the Standard Mark.
  • This license confirms adherence to IS 7196 specifications.

• Testing Requirements:

  • Mechanical strength, corrosion resistance, and dimensional verification are typical tests.
  • Conducted at BIS-approved laboratories or central testing facilities.

• Contact for Certification:

  • Central Manak Bhavan, New Delhi and regional BIS offices (Kolkata, Mumbai, Chennai).
  • Branch offices across India handle compliance assessment.

Typical Testing Parameters

Compliance Process Flow

flowchart TD
    A[Manufacturer] --> B[Manufacture Product]
    B --> C[Testing at BIS Laboratory]
    C --> D{Tests Passed?}
    D -- Yes --> E[Apply for Standard Mark License]
    D -- No --> F[Product Modification]
    F --> B
    E --> G[License Issued]
    G --> H[Use Standard Mark]

Summary: Testing and compliance for IS 7196 holdfasts involve certification by BIS, mechanical and corrosion testing, and dimensional conformity. Contact BIS regional offices for detailed procedures.

IS 7196: Installation Recommendations for Holdfasts

• Dimensions: Follow Figure 1 in IS 7196 for holdfast sizing; all dimensions are in millimeters.
• Material: Mild steel flats meeting specified thickness and length.
• Installation Method:
  • Embed holdfasts vertically into concrete or masonry.
  • Ensure minimum embedment length per Figure 1 for secure anchorage.
  • Align and plumb holdfasts before concrete curing.
• Rounding: Use IS 2 standards for rounding numerical values.
• Steel Flat Standards: Follow IS 2062 for structural steel flat specifications.

Example Holdfast Dimensions

Important Points:

• Embedment depth must be sufficient for load transfer.
• Apply corrosion-resistant coatings if exposed.
• Comply with IS 2062 for steel flat sizes.

flowchart TD
    A[Prepare Concrete Base] --> B[Place Holdfast Vertically]
    B --> C[Ensure Plumb and Alignment]
    C --> D[Pour Concrete and Allow to Cure]
    D --> E[Inspect Holdfast Stability]

Refer to Figure 1 and Clause 3.1 of IS 7196 for detailed installation specifications.

Licensing and Standard Mark Guidelines (IS 7196 Clause 6.2)

• The use of the Standard Mark is regulated under the Bureau of Indian Standards Act, 1986.
• Manufacturers must obtain a license from BIS to apply the Standard Mark to their products.
• Application details and conditions for licensing are available at BIS offices.

Marking Requirements (Clauses 6.1 & 6.1.1)

• Each holdfast must be clearly and permanently marked with:
  • The manufacturer's name or trademark.
  • The Standard Mark (optional, subject to licensing).

BIS Regional Office Contacts

Summary

• Manufacturers must secure a BIS license to use the Standard Mark.
• Markings should be permanent and legible.
• For licensing procedures and inquiries, contact the nearest BIS regional office.

flowchart LR
    A[Manufacturer] --> B[Apply for BIS Licence]
    B --> C{Licence Approved?}
    C -->|Yes| D[Use Standard Mark]
    C -->|No| E[Cannot Use Standard Mark]
    D --> F[Mark Product with Name and Standard Mark]

Refer to BIS Act, 1986 and regional offices for comprehensive licensing information.