Steel back flap hinges -Specification

IS 3843: Scope - Key Specifications

• Scope: Specifies dimensions, tolerances, and conformity criteria for hinges.
• Dimensions & Tolerances:
  • Given in Table 1 and Table 2 (for various hinge types).
  • These tables define key hinge parameters (length, width, thickness, pin diameter, etc.) and allowable deviations.
• Sampling & Conformity:
  • Revised criteria for sampling scale and conformity assessment ensure quality control.
• Rounding Off:
  • Final test or analysis values must be rounded per IS 2:1960 rules.
  • Retain the same number of significant digits as specified in the standard.

Typical Dimension Parameters (from Table 1 & 2)

(Exact values vary by hinge type; refer to IS 3843 Tables 1 & 2)

flowchart LR
    A[Hinge Type] --> B[Dimension Table 1]
    A --> C[Dimension Table 2]
    B & C --> D[Tolerances]
    D --> E[Sampling & Conformity]
    E --> F[Rounding Off per IS 2:1960]

For detailed values, always consult the official IS 3843 Tables 1 & 2.

IS 3843 - Key References: Dimensions & Specifications for Steel Back Flap Hinges

1. Dimensions & Tolerances (Clause 5.1, Clause 6.4.2)

• Hinges classified as Light Weight and Heavy Weight.
• Dimensions in millimeters (mm).
• Tolerances specified as ± values for length, breadth, thickness, etc.

2. Table 1: Light Weight Steel Back Flap Hinges

3. Table 2: Heavy Weight Steel Back Flap Hinges

4. Notes:

• Thickness of flap (C), diameter of hinge pin (D), width of knuckles (E), and number of screw holes are critical for hinge strength and durability.
• Screw numbers correspond to standard screw sizes for mounting.

5. Additional References:

• Annex A (not provided) lists related Indian Standards necessary for full compliance.

flowchart TD
    A[IS 3843 Standard] --> B[Clause 5.1: Dimensions & Tolerances]
    B --> C[Table 1: Light Weight Hinges]
    B --> D[Table 2: Heavy Weight Hinges]
    C

IS 3843: Types and Sizes of Steel Back Flap Hinges

Key Specifications from Tables:

Table 1: Light Weight Steel Back Flap Hinges (Dimensions in mm)

Table 2: Heavy Weight Steel Back Flap Hinges (Dimensions in mm)

IS 3843: Key Specifications for Materials & Dimensions of Steel Back Flap Hinges

1. Materials (Clause 5.00, Table 3)

• Materials must comply with the above grades for durability and performance.

2. Dimensions of Hinges

Table 1: Light Weight Steel Back Flap Hinges (All dimensions in mm)

(Refer to full table in IS 3843 for all sizes)

Table 2: Heavy Weight Steel Back Flap Hinges (All dimensions in mm)

IS 3843 - Dimensions and Tolerances for Steel Back Flap Hinges

1. Light Weight Steel Back Flap Hinges (Table 1)

2. Heavy Weight Steel Back Flap Hinges (Table 2)

IS 3843: Manufacture and Workmanship - Key Specifications

1. Acceptance Criteria for Lots (Clause 10.2.2)

• A lot is accepted if defectives ≤ acceptance number (Table 4, col. 3).
• Rejected if defectives ≥ rejection number (Table 4, col. 4).

2. Dimensions & Tolerances for Steel Back Flap Hinges

Table 1: Light Weight Steel Back Flap Hinges (All dimensions in mm)

Table 2: Heavy Weight Steel Back Flap Hinges (All dimensions in mm)

IS 3843 - Finish: Key Formulas, Tables & Specifications

1. Material Specifications (Clause 5)

2. Dimensions of Hinges (Clause 6.4.2)

• Light Weight Steel Back Flap Hinges (mm):

• Heavy Weight Steel Back Flap Hinges (mm):

3. Position of Screw Holes (Clause 6.4.4)

• Holes must be parallel to the pin.
• For 2 holes: aligned in one line.
• For >2 holes: arranged triangularly.

IS 3843 Key Specifications on Marking and Dimensions

1. Marking (Clause 8.2)

• Products may be marked with the BIS Standard Mark to indicate conformity.
• Marking ensures traceability and compliance with IS standards.

2. Dimensions and Tolerances (Clause 5 & 6.4.2)

• Two hinge types: Light Weight and Heavy Weight Steel Back Flap Hinges.
• All dimensions in millimetres (mm) with specified tolerances.
• Rounding off values per IS 2:1960 rules.

3. Key Tables for Dimensions

4. Example: Light Weight Steel Back Flap Hinges

IS 3843 - Packing Specifications for Hinges

Packing Quantities (Clause 9.1)

• Size up to 25 mm: 30 pieces per package
• Size over 25 mm up to 75 mm: 10 pieces per package
• Hinges shall be packed in multiples of 5 if requested by purchaser.

Key Dimensions & Tolerances for Hinges

Table 1: Light Weight Steel Back Flap Hinges (mm)

Table 2: Heavy Weight Steel Back Flap Hinges (mm)

IS 3843: Sampling and Criteria for Conformity

Key Points:

• Sampling:
  Samples are taken from each lot separately to check conformity (Clause 10.1.2).

• Acceptance/Rejection Criteria (Clause 10.2.2):

  • If the number of defectives ≤ Acceptance Number → Lot conforms.
  • If the number of defectives ≥ Rejection Number → Lot rejected.

Table 4 (Typical format for acceptance sampling):

• Note: Exact values for sample size, acceptance, and rejection numbers are given in Table 4 of IS 3843 (refer to the code for detailed values).

Summary:

• Test samples from each lot.
• Use Table 4 to determine acceptance/rejection.
• Lot accepted if defectives ≤ Ac; rejected if defectives ≥ Re.

flowchart TD
    A[Start: Sample from Lot] --> B{Count Defectives}
    B -->|≤ Acceptance Number| C[Lot Accepted]
    B -->|≥ Rejection Number| D[Lot Rejected]
    B -->|Between Ac and Re| E[Further Inspection or Decision]

For exact dimensions and modifications, refer to Tables 1 & 2 in IS 3843.

IS 3843 references several Indian Standards essential for materials, design, and testing related to the subject of the code (builders hardware). While Annex A of IS 3843 lists these standards, key referenced IS codes typically include:

• IS 2062: Steel for general structural purposes
• IS 1237: Mild steel and medium tensile steel bars and hard-drawn steel wire for concrete reinforcement
• IS 1367: Hexagon bolts, screws, and nuts of product grades A and B
• IS 1363: Hexagon head bolts, screws, and nuts (general purpose)
• IS 814: Specification for steel tubes for structural purposes
• IS 1597: Code of practice for design and installation of expansion joints

Important Notes:

• These referenced standards provide material specifications, mechanical properties, and testing methods.
• Always consult the latest versions of these IS codes for detailed tables and formulas.

Typical Use in IS 3843 Context:

For detailed formulas or tables, refer to the specific IS code mentioned in Annex A of IS 3843.

flowchart LR
    A[IS 3843] --> B[Annex A: Referenced IS Codes]
    B --> C[IS 2062 - Structural Steel]
    B --> D[IS 1367 - Bolts & Nuts]
    B --> E[IS 1597 - Expansion Joints]

Summary: IS 3843 relies on multiple IS codes for material and hardware specifications. Always cross-reference Annex A for the complete list and consult respective standards for detailed technical data.

IS 3843 - Committee Composition & Key Specifications

• Committee Composition:
  The technical committee responsible for IS 3843 formulation is detailed in Annex B of the code. It is under the Builder's Hardware Sectional Committee, CED 15.

• Key Clauses:

  • Clause 10.2: Specifies the Number of Tests and Criteria for Conformity.
  • Sampling & Conformity: Revised criteria for scale of sampling and conformity are included, affecting dimensions in Table 1 and Table 2.

Important Tables & Specifications (Summary)

Sampling & Testing (Clause 10.2)

• Defines sample size for tests.
• Sets acceptance/rejection criteria based on conformity.

If you need detailed formulas or the tables, refer directly to Annex B and Clause 10.2 in IS 3843 for exact values and committee member details.