Steel butt hinges

IS 1341: Scope Summary & Key Specifications

IS 1341 covers dimensions and tolerances for mild steel butt hinges of various types (Light Weight, Heavy Weight Type 1 & 2).

Key Tables for Dimensions (Clause 6.4)

Example: Light Weight Mild Steel Butt Hinges (mm)

Example: Heavy Weight Type 1 Mild Steel Butt Hinges (mm)

IS 1341 - Referenced Indian Standards & Sampling Criteria

Key Referenced IS Codes (Annex A)

Sampling & Criterion for Conformity (Annex B, Clause 10)

• Hinges of the same type, size, and material form a lot.
• Sample size and permissible defective hinges depend on lot size:

Notes:

• Dimension B in hinge drawings varies: uncranked hinge uses standard B; cranked hinges have increased B.
• BIS controls quality certification and standardization under the BIS Act, 1986.

flowchart LR
    LotSize --> SampleSize
    SampleSize --> PermissibleDefects
    LotSize["Lot Size"] --> SampleSize["Sample Size"]
    SampleSize --> PermissibleDefects["Permissible Number of Defective Hinges"]

For detailed hinge dimensions and manufacturing tolerances, refer to IS 1341 and the above referenced IS codes.

IS 1341 - Materials & Dimensions for Steel Butt Hinges

1. Material Specifications (Table 4)

2. Dimensions for Mild Steel Butt Hinges

Light Weight Hinges (Table 2)

Medium Weight Hinges (Table 3)

IS 1341: Types and Dimensions of Mild Steel Butt Hinges

Key Specifications (from Clauses 5.1 & 6.4)

The standard provides dimensions and tolerances for various hinge types, primarily:

• Broad Type Hinges
• Heavy Weight Type 1 Hinges
• Heavy Weight Type 2 Hinges

Important Dimension Parameters:

Sample Table: Heavy Weight (Type 2) Mild Steel Butt Hinges

(Refer to IS 1341 Tables 4, 6, 7 for full details on all types and sizes)

Notes:

• Tolerance on length and breadth is generally ±0.5 mm to ±2 mm depending on size.
• **Kn

IS 1341 - Manufacture Specifications for Mild Steel Butt Hinges (Clause 6.4)

The code provides detailed dimensional tables for different types of mild steel butt hinges:

1. Light Weight Hinges (Table 2)

2. Medium Weight Hinges (Table 3)

• Thickness ranges from 1.20 mm to 2.24 mm.
• Pin diameter from 2.00 mm to 6.30 mm.
• Number of knuckles: 3 or 5.
• Screw holes: 4 to 8, with corresponding screw numbers.

3. Broad Type Hinges (Table 4)

• Lengths from 50 mm to 150 mm.
• Thickness from 1.50 mm to 2.24 mm.
• Pin diameter from 4.00 mm to 7.10 mm.
• Knuckles: 3 or 5.
• Screw holes: 4 to 8.

4. Square Type Hinges (Table 5)

• Length and breadth equal (50 mm to 100 mm).
• Thickness from 1.70 mm to 2.50 mm.
• Pin

IS 1341: Finish Specifications for Mild Steel Butt Hinges (Clause 6.4)

The code provides detailed dimensions and tolerances for various types of mild steel butt hinges, focusing on finish quality through dimensional conformity.

Key Tables for Finish (Dimensional Specifications):

Sample from Table 2 (Light Weight Hinges):

Finish Quality Control:

• Dimensional tolerances ensure uniformity and fit.
• Sampling and conformity criteria (Clause 6.4) ensure consistent finish across batches.
• Proper finish affects corrosion resistance and mechanical performance.

Summary:

• Finish in IS 1341 is controlled by strict dimensional tolerances.
• Use the tables for Light, Medium, and Heavy Weight hinges to verify finish.
• Ensure pin diameter, flap thickness, and screw hole specs conform to the code for proper

IS 1341 - Marking: Key Specifications & Tables for Mild Steel Butt Hinges

Marking Requirements (Clause 6.4)

• Hinges must be marked for easy identification of:
  • Manufacturer's name or trademark
  • Size and type of hinge
  • Batch or heat number for traceability
• Marking should be clear, durable, and legible after handling.

Key Dimensions from IS 1341 Tables (Clause 6.4):

IS 1341: Packing Specifications for Hinges (Clause 9.1)

• Packing in cardboard boxes or approved packing.
• Hinges may be packed in multiples of six if purchaser requires.

Key Dimensions & Tolerances for Light & Medium Weight Mild Steel Butt Hinges

Notes:

• Dimensions vary by hinge size.
• Refer to Tables 2 & 3 in Clause 6.4 for exact values per size.
• Tolerances ensure interchangeability and fit.

flowchart LR
    A[Hinge Size] --> B{Packing Quantity}
    B -->|15,20,25 mm| C[30 pieces/package]
    B -->|>25 to 75 mm| D[20 pieces/package]
    B -->|>75 mm| E[10 pieces/package]
    F[Purchaser Requirement] --> G[Multiples of 6 packing allowed]

IS 1341: Sampling and Criterion for Conformity

Key Points from Clause 6.30 & Annex B:

• Lot Definition: Hinges of same type, size, material, and manufacturing conditions form a lot.
• Sampling: Representative samples are taken from each lot for conformity testing.

Sampling & Conformity Criteria (Summary)

• Samples must be randomly selected from the lot.
• The lot is accepted if all sampled hinges meet dimensional and quality requirements.
• If defects found exceed permissible limits, the lot is rejected or subjected to 100% inspection.

Key Dimensional Tables (Clause 6.4)

Note: Dimension B for uncranked hinges; increases for cranked hinges.

Practical Use:

• Use these tables to verify hinge dimensions during sampling.
• Confirm number of knuckles, screw holes, and pin diameter per size/type.
• Reject lot if sampled hinges deviate beyond specified tolerances.

flowchart TD
    A[Lot of Hinges] --> B[Random Sampling]
    B --> C{Samples Meet Specs?}
    C -->|Yes| D[Accept Lot]
    C -->|No| E[Reject or 100% Inspection]

IS 1341 Annex A: List of Referenced Indian Standards

Sampling & Criterion for Conformity (Annex B, Clause 10)

• A lot = all hinges of same type, size, material & manufacturing conditions.
• Sample sizes and permissible defective hinges:

Note on Dimension B (Clause 6.30):

• For uncranked hinges, use specified dimension B.
• For cranked hinges, dimension B increases accordingly.

This summary aids in referencing related IS codes and quality control sampling for butt hinges per IS 1341.

IS 1341: Sampling and Criterion for Conformity - Key Details

Sampling Criterion (Clause 6.30 & Annex B)

• Lot Definition: Hinges of same type, size, material, and manufacturing conditions grouped as one lot.
• Sample Size: As per Clause 6.4, sample size depends on lot size and hinge type.
• Dimension B Note: For cranked hinges, dimension B increases from that of uncranked hinges.

Key Tables for Dimensions (Clause 6.4)

Refer to IS 1341 Tables 3, 4, 5 for full size ranges.

Summary of Specifications:

• Thickness of Flap (C): Varies 1.20 mm to 2.50 mm depending on hinge size/type.
• Diameter of Hinge Pin (D): Ranges from 2.00 mm to 7.10 mm.
• Knuckles: Usually 3 or 5, depending on hinge size.
• Screw Holes: 4 to 8 holes, sized for specific screw numbers (e.g., 6 to 10).

Sampling Procedure:

• Inspect sample hinges from the lot.
• Check dimensions against above tolerances.
• Accept/reject lot based on conformity