Specification for flush bolts

IS 5187 - Scope: Key Specifications & Tables

Scope Summary:

• Covers flush bolts dimensions, tolerances, workmanship, and conformity criteria.
• Manufacturer and purchaser must agree on specific clauses (3.2, 6.1).
• Final test values rounded as per IS 2:1960.

Key Tables & Specifications:

1. Tolerance on Dimensions (Clause 5.2)

• Refer to Table 2 and Table 3 for dimensional tolerances of Type 1 & Type 2 flush bolts.

2. Table 2: Flush Bolts (Type 1) Dimensions (mm)

3. Table 3: Flush Bolts (Type 2) Dimensions (mm)

IS 5187: Materials for Flush Bolts (Clause 2.1 & Table 1)

• Only one material type (except spring) should be used for all flush bolt components.
• Material specifications ensure durability, corrosion resistance, and mechanical strength.

Additional Notes:

• Dimensions and tolerances of flush bolts are specified in Tables 2 & 3 of IS 5187.
• Rounding off values must follow IS: 2-1960.
• Component shapes and screw hole positions are illustrative, adaptable per design needs.

flowchart TD
    A[Flush Bolt Components] --> B[Body & Plate]
    A --> C[Bolt]
    A --> D[Spring]

    B --> E[Cast Brass (IS:292 Grade 3)]
    B --> F[Cast/Extruded Aluminium Alloy (IS:617, 733)]
    C --> G[Cast Brass (IS:292 Grade 3)]
    C --> H[Extruded Brass (IS:319)]
    C --> I[Extruded Aluminium Alloy (IS:733)]
    D --> J[Phosphor Bronze (IS:1385)]
    D --> K[Steel Strip (IS:2507)]

This summary aids in selecting appropriate materials per IS 5187 for manufacturing flush bolts.

IS 5187: Flush Bolts — Types, Sizes, and Shapes

Types:

• Type 1 and Type 2 Flush Bolts as per Clause 5.1 and Figures.

Key Dimensions (All in mm):

Materials (Clause 2.1, Table 1):

• Body and Plate: Cast Brass (Grade 3 IS:292), Cast/Extruded Aluminium Alloy (IS:617, IS:733)
• Bolt: Cast/Extruded Brass (IS:292, IS:319), Extruded Aluminium Alloy (IS:733)
• Spring: Phosphor Bronze (PCuSn4 IS:1385), Steel Strip (IS:2507)

Notes:

• Dimensions include tolerances as per Tables 2 & 3.
• Shapes and screw hole positions are illustrative, not limiting design.
• Bolt movement via knob or lever.

Summary Diagram of Flush Bolt Components

graph LR
A[Face Plate] -->|Length, Breadth, Thickness| B[Flush Bolt Body]
B -->|Bolt Diameter, Throw| C[Bolt]
B -->|Spring| D[Spring]
A -->|Lip Extension| E[Lip]
A -->|Screw Hol

IS 5187: Manufacture and Construction of Flush Bolts

1. Materials (Clause 2.1, Table 1)

• Body & Plate:
  • Cast brass (IS: 292-1961, Grade 3)
  • Cast aluminium / Extruded aluminium alloy (IS: 617-1959, IS: 733-1967)
• Bolt:
  • Cast brass (IS: 292-1961)
  • Extruded brass (IS: 319-1968)
  • Extruded aluminium alloy (IS: 733-1967)
• Spring:
  • Phosphor bronze (IS: 1385-1968)
  • Steel strip (IS: 2507-1965)

2. Dimensional Tolerances (Clause 5.2, Tables 2 & 3)

• Note: Minimum dimensions shall not be less than the lip extension of the face plate.

3. Workmanship and Finish (Clause 6)

• Components must be free from defects affecting performance.
• Surface finish should be smooth and corrosion-resistant as per material.

4. Marking (Clause 5.1)

• Flush bolts shall be marked for size and manufacturer identification.

Summary Diagram:

IS 5187: Dimensions of Flush Bolts (Type 1 & Type 2)

Key Points from Clause 5.1 & 5.2:

• Dimensions and tolerances of flush bolts are specified in Table 2 (Type 1) and Table 3 (Type 2).
• Bolt length should ensure the bolt top is flush or max half thickness recessed below the face plate (Clause 4.2).
• Bolt top has a 45° taper for ease of operation.

Table 2: Flush Bolts (Type 1) Dimensions (mm)

Table 3: Flush Bolts (Type 2) Dimensions (mm)

IS 5187 - Finish: Key Formulas, Tables & Specifications

1. Tolerance on Dimensions (Clause 5.2)

• Tolerances for flush bolts dimensions are specified in Table 2 (Type 1) and Table 3 (Type 2).
• All dimensions are in millimeters (mm).

2. Dimensions of Flush Bolts

Note: Minimum dimensions shall not be less than the lip extension of the face plate.

3. Workmanship and Finish (Clause 6)

• Flush bolts must have manufacturer’s name or trademark (Clause 7.1).
• Finish specifications include:
  • Electroplated coatings of nickel and chromium on copper alloys.
  • Oxidized copper finishes.
  • Anodic coatings on aluminum.

Summary Table Extract (Type 1 Example):

IS 5187: Marking of Flush Bolts – Key Specifications

1. Marking Clause (7.1.1)

• Each flush bolt may bear the ISI Certification Mark, ensuring compliance with IS standards.
• ISI Mark indicates:
  • Production under strict inspection, testing, and quality control.
  • Continuous market conformity checks by ISI.

2. Dimensions & Tolerances (Clauses 5.1 & 5.2)

• Tolerance: As per Tables 2 & 3, dimensions must not be less than lip extension.

3. Sampling & Quality Control (Clause 1.2, Table 4)

Summary Diagram: Marking & Quality Flow

flowchart TD
    A[Manufacture Flush Bolts] --> B[Apply ISI Mark (Optional)]
    B

IS 5187: Sampling and Testing of Flush Bolts

Key Specifications from Appendix A (Clause 9.1)

1. Sampling Scale & Conformity Criteria (Table 4)

• Lot: Total flush bolts produced.
• Sample Size: Number of bolts randomly selected for testing.
• Permissible Defectives: Maximum allowed defective bolts in the sample for the lot to be accepted.

2. Tolerance on Dimensions

• Refer to Table 2 and Table 3 of IS 5187 for dimensional tolerances.
• Tolerances ensure flush bolts meet size and fit requirements.

3. Rounding of Test Results

• Test results must be rounded off as per IS 2-1960.
• Maintain the same significant figures as the specified values.

Summary Diagram: Sampling Process

flowchart TD
    A[Start: Lot of Flush Bolts] --> B{Determine Lot Size}
    B -->|Up to 200| C[Sample 15 bolts]
    B -->|201-300| D[Sample 20 bolts]
    B -->|301-500| E[Sample 30 bolts]
    B -->|501-800| F[Sample 40 bolts]
    B -->|801+| G[Sample 55 bolts]
    C --> H[Test Sample]
    D --> H
    E --> H
    F --> H
    G --> H
    H --> I{Count Defective Bolts}
    I -->|≤ Permissible| J[Lot Accepted]
    I -->|> Permissible| K[Lot Rejected]

Use this sampling plan to ensure quality control and conformity in flush bolt production as per IS 5187.

IS 5187: Criterion for Conformity - Key Points

Sampling & Acceptance Criteria (Table 4)

Conformity Clause (A-3.1)

• A lot is conforming if the number of defective bolts in the sample is ≤ permissible defective bolts from the table.
• Otherwise, the lot is not conforming.

Defect Definition (Clause 2.1)

• Bolts failing dimensional requirements (Clause 5) or finish (Clause 6) are defective.

Tolerance (Clause 5.2)

• Dimensions must comply with Tables 2 & 3 (not provided here).

Summary:

• Sample size and acceptance depend on lot size.
• Zero to three defective bolts allowed, depending on lot size.
• Defects include dimensional or finish failures.
• Non-conforming lots must be rejected or reworked.

flowchart TD
    A[Select Lot] --> B[Determine Lot Size]
    B --> C{Lot Size Range}
    C -->|Up to 200| D[Sample 15 bolts]
    C -->|201-300| E[Sample 20 bolts]
    C -->|301-500| F[Sample 30 bolts]
    C -->|501-800| G[Sample 40 bolts]
    C -->|>800| H[Sample 55 bolts]
    D --> I[Check bolts for defects]
    E --> I
    F --> I
    G --> I
    H --> I
    I --> J{Defective bolts ≤ permissible?}
    J -->|Yes| K[Lot Conforms]
    J -->|No| L[Lot Does Not Conform]

This ensures quality control by statistically sampling flush bolts and accepting lots only if defects are within permissible limits.

IS 5187: Sampling and Specifications for Flush Bolts

Key Points from IS 5187:

1. Dimensions of Flush Bolts

• Type 1 and Type 2 flush bolts dimensions are specified in Tables 2 & 3 (all in mm):

• Minimum lip extension ≥ face plate length & breadth.

2. Materials (Table 1)

• Body & Plate: Cast brass (IS:292 Grade 3), cast/extruded aluminium alloys (IS:617, IS:733).
• Bolt: Cast brass, extruded brass (IS:319), extruded aluminium alloy.
• Spring: Phosphor bronze (IS:1385), steel strip (IS:2507).

3. Sampling & Conformity (Appendix A, Clause 9.1)

• Sampling scale and conformity criteria are detailed in Appendix A (not fully reproduced here).
• Sampling ensures bolts meet dimensional and material specs.

Summary Table for Dimensions (Type 1 Example)

| Size | Face Plate (L×B×T) mm | Throw (F) mm | Bolt Dia (D) mm | Lip Extension (G) mm | Screw Holes | Screw Hole Size (mm) | |-------|-----------------------|--------------|-----------------|---------------------|-------------|