Stainless steel tower bolts -Specification

IS 15833 - Scope: Key Specifications & Tables

• Scope: Covers stainless steel tower bolts with specified minimum dimensions and requirements (Clause 10.0). Illustrative shapes (Fig. 1) are non-binding; dimensions are mandatory.

Key Table: Stainless Steel Tower Bolts Dimensions (Clause 3.2)

Tolerances:

• Length of Bolt A & Barrel B: +3 / -1 mm
• Width of Barrel C: ±1 mm
• Diameter of Bolt D: ±0.50 mm
• Length of Socket E: ±1 mm
• Thickness of Steel for Barrel F: ±0.10 to ±0.15 mm

Notes:

• Minimum number of equally spaced screw holes for wood screws No. 6 ensures secure fixing.
• Dimensions ensure interchangeability and performance.
• Rounding off values per IS 2

IS 15833: Key References, Tables & Specifications

1. References (Table 2)

These referenced standards form an integral part of IS 15833 and should be consulted for detailed specifications on materials and fasteners.

2. Stainless Steel Tower Bolts Dimensions (Table 1, Clauses 3.2 & 6)

Tolerances:

• Lengths A and B: +3/-1 mm
• Width C: ±1 mm
• Diameter D: ±0.50 mm
• Length E: ±1 mm
• Thickness F: ±0

IS 15833: Nominal Sizes for Stainless Steel Tower Bolts

• Nominal size is defined by the Length of Barrel (B) (Clause 3.2).
• Table 1 specifies dimensions for tower bolts of sizes: 100, 150, 200, 250, and 300 mm.

Tolerances:

• Length of Bolt A & Barrel B: +3 / -1 mm
• Width of Barrel C: ±1 mm
• Diameter of Bolt D: ±0.50 mm
• Length of Socket E: ±1 mm
• Thickness of Steel for Barrel F: ±0.10 to ±0.15 mm

Summary:

• Use Length of Barrel (B) to denote size.
• Minimum number of screw holes increases with size.
• Thickness and bore diameter depend on bolt diameter (10 or 12 mm).

IS 15833: Key Material Specifications & Tables

Materials References (Table 2)

• Stainless steel wire rods: IS 6527:1995
• Wood screws (slotted countersunk head): IS 6760:1972
• Stainless steel plate, sheet, strip: IS 6911:1992

Stainless Steel Tower Bolts (Table 1, Clauses 3.2 & 6)

Tolerances:

• Lengths: +3/-1 mm
• Width: ±1 mm
• Diameter: ±0.50 mm
• Thickness: ±0.10 to ±0.15 mm

Material Compliance

• Manufacturer must provide a certificate of compliance per Clause 10.5 confirming adherence to material requirements in Clause 4.

This summary aids in selecting and verifying stainless steel tower bolts per IS 15833, ensuring proper dimensions and material quality.

IS 15833: Construction and Workmanship - Key Specifications & Sampling

1. Construction & Workmanship:

• Shapes in Fig. 1 are illustrative; dimensions and minimum requirements are mandatory.
• Emphasis on quality control during manufacturing and installation.

2. Sampling & Criteria for Conformity (Clause 10.2, Table 10.4):

• Sampling is essential to ensure lot conformity.
• Defective tower bolts beyond permissible limits mean lot rejection.

3. Additional Notes:

• Refer to IS 6760 for wood screws and IS 6527/6911 for stainless steel materials.
• Ensure workmanship follows BIS guidelines for durability and safety.

flowchart LR
    A[Lot Size] --> B[Sample Size]
    B --> C[Check Defective Units]
    C -->|Within Limit| D[Accept Lot]
    C -->|Exceeds Limit| E[Reject Lot]

Summary: Use the sampling table for quality checks; follow specified dimensions strictly for workmanship.

IS 15833: Dimensions and Tolerances for Stainless Steel Tower Bolts

Key Dimensions & Tolerances (from Table 1)

Tolerances

• Length of Bolt A & Barrel B: +3 / -1 mm
• Width of Barrel C: ±1 mm
• Diameter of Bolt D: ±0.50 mm
• Length of Socket E: ±1 mm
• Thickness of Steel for Barrel F: ±0.10 (D=10mm), ±0.15 (D=12mm) mm

Additional Specifications

• Bolt must be single piece with integral knob or knob fitted securely (Clause 5.2).
• Surface finish: Polished bright with smooth surface.
• Minimum number of equally spaced screw holes as per size.

Summary Diagram

graph LR
A[Length of Bolt A] --> B[Length

IS 15833: Finish and Marking - Key Specifications

Finish:

• Stainless steel tower bolts must have a smooth, corrosion-resistant finish as per IS 6527 and IS 6911.
• Surfaces should be free from defects such as cracks, pits, or roughness affecting performance.

Marking:

• Governed by BIS Act 1986 and related rules (Clause 8.1.1.1).
• Each carton must have a label with:
  • Manufacturer's name or trademark
  • Size of tower bolts
  • Quantity contained

Packing:

• Bolts are packed in cartons with clear markings.
• Ensures traceability and quality assurance.

Table Extract: Stainless Steel Tower Bolts Dimensions (mm)

Tolerances apply as per table.

Summary Diagram: Tower Bolt Components

flowchart LR
    A[Length of Bolt (A)]
    B[Length of Barrel (B)]
    C[Width of Barrel (C)]
    D[Diameter of Bolt (D)]
    E[Length of Socket (E)]
    F[Thickness of Steel for Barrel (F)]
    G[Diameter of Bore (G)]

    A --> B --> C --> D --> E --> F

IS 15833: Packaging and Labelling for Stainless Steel Tower Bolts

Key Specifications:

• Packaging: Stainless steel tower bolts shall be packed suitably in cartons.
• Labelling: Each carton must have a label indicating:
  • Source of manufacture or trade-mark
  • Size of tower bolts
  • Quantity of tower bolts

Important Dimensions & Tolerances (from Table 1):

All dimensions in mm; Tolerances as per table.

Notes:

• Refer Fig. 1 (typical sketch) for shape illustration.
• The Standard Mark usage is governed by BIS Act, 1986.
• Refer IS 6760 for wood screws used with tower bolts.

flowchart LR
    A[Manufacture] --> B[Packaging in Cartons]
    B --> C[Label on Carton]
    C --> D{

IS 15833 — Sampling and Inspection (Clause 10)

Key Points on Sampling and Inspection:

• Sample Size Selection (Clause 10.2):
  Depends on the lot size as per Table 2 below.

• Criteria for Conformity (Clause 10.4):
  A lot is accepted if the number of defective bolts in the sample does not exceed the permissible number in Table 2.

Table 2: Scale of Sampling and Criterion for Conformity

Summary:

• Select sample size based on lot size.
• Inspect sample for defects.
• Accept lot if defective count ≤ permissible defective bolts.
• Reject otherwise.

flowchart TD
    A[Start: Lot of tower bolts] --> B{Determine Lot Size}
    B --> |Up to 200| C[Sample 5 bolts]
    B --> |201-300| D[Sample 8 bolts]
    B --> |301-500| E[Sample 13 bolts]
    B --> |501-800| F[Sample 20 bolts]
    B --> |801+| G[Sample 25 bolts]

    C --> H[Inspect Sample]
    D --> H
    E --> H
    F --> H
    G --> H

    H --> I{Defective bolts ≤ Permissible?}
    I --> |Yes| J[Accept Lot]
    I --> |No| K[Reject Lot]

This ensures quality control per IS 15833 standards for stainless steel tower bolts.

IS 15833: Criteria for Conformity (Clause 10.4)

A lot of tower bolts is conforming if the number of defective bolts in the inspected sample does not exceed the permissible number in Table 2. Otherwise, the lot is non-conforming.

Table 2: Scale of Sampling and Criterion for Conformity

Key Points:

• Sample size depends on lot size.
• Defects allowed are limited to ensure quality.
• Manufacturer must provide a certificate of compliance per Clause 10.5.

flowchart TD
    A[Lot of Tower Bolts] --> B[Select Sample Size (Table 2)]
    B --> C[Inspect Sample]
    C --> D{Defective Bolts ≤ Permissible Number?}
    D -->|Yes| E[Lot Conforms]
    D -->|No| F[Lot Does Not Conform]

This ensures consistent quality control in manufacturing and inspection.

IS 15833 - Committee Composition & Sampling Criteria

Committee Composition (Annex A)

• The Committee is the Builder's Hardware Sectional Committee, CED 15.
• Includes representatives from:
  • BIS Directorate General (Chair & Member Secretary)
  • Allied Anodisers, Argent Industries, Builders Association of India, Central Building Research Institute, CPWD, DDA, Godrej & Boyce, Hindalco, Indian Aluminium Co., National Test House, NTPC, Ministry of Railways, and others.
• Chairman: Shri B. Majumdar (In personal capacity)
• Member Secretary: Shri Naveen Kumar Veeramalla, Scientist 'B', BIS

Sampling Scale & Criteria for Conformity (Clause 10.2, Table 2)

• Sample size depends on lot size.
• Permissible defective bolts are limited as above for acceptance.

Summary Diagram of Sampling Criteria

flowchart TD
    A[Lot Size] --> B{Sampling Size}
    B --> |Up to 200| C[Sample: 5, Max Defect: 0]
    B --> |201-300| D[Sample: 8, Max Defect: 1]
    B --> |301-500| E[Sample: 13, Max Defect: 2]
    B --> |501-800| F[Sample: 20, Max Defect: 2]
    B --> |801+| G[Sample: 25, Max Defect: 3]

This composition and sampling ensure standardization and quality control in stainless steel tower bolts under IS 15833.