Understanding the Evolution and Specifications of Tower Bolts

 Foreword

The Indian Standard for tower bolts, now in its fifth revision, was adopted by the Bureau of Indian Standards following approval by the Civil Engineering Division Council and the Builders Hardware Sectional Committee. Initially published in 1950 and revised in 1961, 1966, 1974, and 1978, the standard was bifurcated during the fourth revision into two parts: Part 1 for ferrous metals and Part 2 for non-ferrous metals. This latest revision introduces necessary updates to dimensions, practical use, and sampling clauses, aligning with the latest Indian Standards and international practices. All tower bolts must comply with these standards, with final values from tests rounded off as specified by IS 2: 1960.

Tower Bolts - Specification

1. Scope

This standard (Part 2) specifies the requirements for tower bolts made from non-ferrous metals, including:

  • Barrel Tower Bolts:
    • Brass barrels with cast or rolled brass bolts.
    • Aluminium barrels with extruded aluminium alloy sections.
    • Zinc barrels with die-cast zinc alloy.
  • Skeleton Tower Bolts:
    • Brass skeletons with cast brass plates and rolled or drawn brass bolts.
    • Aluminium skeletons with extruded aluminium alloy sections.
    • Zinc skeletons with die-cast zinc alloy plates and staples.

2. References

The Indian Standards listed in Annex A serve as necessary adjuncts to this standard.

3. Types

  • Barrel Tower Bolts: Available in brass, aluminium, or zinc, featuring various constructions and finishes.
  • Skeleton Tower Bolts: Includes brass, aluminium, and zinc options with specific design requirements.

4. Materials

Materials for different types of tower bolts must conform to the standards specified in Table 3 of the standard.

5. Manufacture

Tower bolts must be well-made, smooth, and free from defects. Sharp edges and corners should be removed. Where possible, the knob should be integral with the bolt. For non-ferrous metals, bolts should feature a small spring and ball inside the barrel to ensure smooth operation.

6. Dimensions and Tolerances

The dimensions of barrel and skeleton tower bolts must conform to specified standards, with tolerances outlined in Table 1.

7. Finish

  • Brass Tower Bolts: Should be polished or plated according to standards.
  • Aluminium Tower Bolts: Must be anodized to a specified grade.
  • Zinc Tower Bolts: Require oxidation or plating as specified.

8. Packing

Tower bolts should be packed in cartons with appropriate labeling. Aluminium tower bolts need individual wrapping to ensure protection.

9. Sampling and Criteria for Conformity

Sampling criteria and testing procedures are outlined to ensure conformity. A lot is considered conforming if the number of defective bolts does not exceed the allowable number.

10. Marking

Each tower bolt must be clearly marked with the manufacturer's name or trademark. The Standard Mark may also be included if applicable.

Conclusion

Understanding the specifications and standards for tower bolts is essential in the door hardware industry. Whether you’re sourcing from leading #doorkitmanufacturers or looking for #doorkitmanufacturersinindia, being knowledgeable about these details ensures you receive high-quality products that meet industry standards.

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#doorkitmanufacturers #doorkitmanufacturersinrajkot #doorkitmanufacturersinindia #doorkitmanufacturerinahmedabad #doorkitmanufacturersinaligarh #circleindustriesahmedabad #doorlatchset #doorkit #doorkitmanufacturers #doorkitsetstainlesssteel #aldropdoorkit #aldrop #aldropfordoor #aldropformaindoor #aldropandhandle #aldropbolt #cabinethandle #kitchencabinethandle #handleforcabinet #doorhandle #doorhandleset #maindoorhandles #doorstopper #towerbolt

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