Mild Steel Sliding Door Bolts for Use With Padlocks -Specification

IS 281: Scope - Key Specifications & Tables

1. Scope Summary

IS 281 covers mild steel sliding door bolts, specifying dimensions, materials, sampling, and acceptance criteria.

2. Material Specification

• Mild steel rods must conform to Grade Fe 410 W of IS 2062 (Clause 5.3).

3. Dimensions & Tolerances

• Detailed dimensions for plate type bolts and hasp designs are provided in Table 1 and Figures 1A, 1B, 2A, 2B.
• For 375 mm & 450 mm bolts, provide an extra supporting clip (31 ± 1 mm length, 1.25 ± 0.10 mm thick mild steel sheet).

4. Sampling & Acceptance Criteria (Table A-2)

5. Hole Specifications

• 8 mm square holes for 1/4" carriage bolts.
• Countersunk holes for designation No. 9 wood screws (IS 451).

6. Additional Notes

• Shapes in figures are illustrative; dimensions and minimum requirements are binding.
• Bolt plates have specified rivets, screws, and hole counts per size (see Table 1).

flowchart LR
    A[Material: Fe 410 W Steel] --> B[Dimensions per Table 1]
    B --> C[Sliding

IS 281 Key References: Sampling, Dimensions & Specifications

Sampling & Acceptance Criteria (Clause 1.2 & 3.15)

Dimensions of Mild Steel Sliding Door Bolts (Table 1)

Material Specification (Clause 5.3)

• Mild steel rods must conform

IS 281: Key Specifications for Sliding Door Bolts

Types & Sizes

• Plate type sliding bolts: 150, 200, 250, 300, 375, 450 mm
• Clip or bolt type sliding bolts: 200, 250, 300, 375, 450 mm

Material

• Mild steel rods: Grade Fe 410 W as per IS 2062 (Clause 5.3)

Dimensions & Tolerances for Clip/Bolt Type (Length A)

Construction Details (Clause 7.2)

• Back plates, straps, and hasps: Mild steel sheets
• Sliding bolt: Round mild steel bar
• Hasp: Cut, finished, riveted securely
• Staple plate: Countersunk holes, riveted staples or one-piece mild steel sheet staple
• Screw holes: Countersunk for wood screws (see Table 1, Fig. 2A/2B)
• Square holes 8 mm for carriage bolts on plate

Finish & Functionality (Clause 7.1)

• Smooth sliding action mandatory
• All sharp edges/corners removed and finished smooth
• Countersunk screw holes for flush fixing

flowchart LR
    A[Sliding Door Bolt Types]
    A --> B[Plate Type (150-450 mm)]
    A --> C[Clip/Bolt Type (200-450 mm)]
    B --> D[Back Plate & Hasp: Mild Steel Sheet]
    C --> E[Sliding Bolt: Round Mild Steel Bar]
    D --> F[Staple: Riveted or One-piece]
    E --> F

This summary aids in selecting and verifying sliding door bolts per IS 281 standards.

IS 281: Dimensions and Tolerances for Sliding Door Bolts

1. Dimensions & Tolerances (Clause 6)

• Dimensions must conform to Table 1 and figures (1A, 1B for plate type; 2A, 2B for clip/bolt type).
• Length tolerance for sliding bolts (clip/bolt type):

2. Key Dimensions for Plate Type Sliding Door Bolts (Table 1)

• Example for 150 mm size:

• Number of rivets, screws, and carriage bolt holes specified per size.

3. Holes & Fasteners

• 8 mm square holes for 1/4" carriage bolts.
• Countersunk holes for Designation No. 9 wood screws (see IS 451).
• Rivets and screws per bolt size detailed in Table 1.

4. Material

• Mild steel rods: Grade Fe 410 W as per IS 2062 (Clause 5.3).

Summary Diagram of Dimensions (Plate Type Bolt)

graph LR
A[Length A] --> B[Width B]
B --> C[Height C]
C --> E[Flap E]
E --> T[Thickness T]
T --> Holes[8 mm Sq. Holes for Carriage Bolts]

References:

• **

IS 281: Key Specifications for Materials (Clause 5.3 & Related)

1. Material Specification for Mild Steel Rods

• Mild steel rods for sliding door bolts must conform to Grade Fe 410 W of IS 2062.

2. Dimensions & Tolerances (Clause 6)

• Length of sliding bolts (clip or bolt type):

• Plate type sliding door bolts dimensions and tolerances are given in Table 1 (see IS 281 Fig. 1A, 1B), including hole sizes for carriage bolts (8 mm square holes) and wood screws (designation No. 9 per IS 451).

3. Material Details

• Mild steel sheets and rods used must comply with IS standards ensuring mechanical properties and durability.
• Bolt holes: 8 mm square for 1/4" carriage bolts.
• Wood screw holes: Countersunk for designation No. 9 wood screws.

Summary Table: Dimensions of Plate Type Sliding Door Bolts (Excerpt)

IS 281 — Manufacture of Mild Steel Sliding Door Bolts: Key Formulas, Tables & Specs

1. Material Specification

• Mild steel rods must conform to Grade Fe 410 W of IS 2062 (Clause 5.3).

2. Sampling & Acceptance Criteria (Table A-2, Clause 1.2)

3. Dimensions & Tolerances

• Plate Type Sliding Bolts: See Table 1 & Fig. 1A, 1B.
• Clip or Bolt Type Sliding Bolts: See Fig. 2A (single flap) & 2B (double flap).

4. Dimensional Table for Plate Type Bolts (Excerpt from Table 1)

IS 281: Finish Specifications for Mild Steel Sliding Door Bolts

Key Points on Finish & Dimensions:

• Material: Mild steel rods conforming to Grade Fe 410 W (IS 2062).
• Finish: Typically, the bolts and plates are supplied with a clean, smooth surface suitable for painting or galvanizing.
• Holes:
  • 8 mm square holes for 1/4" carriage bolts.
  • Countersunk holes for Designation No. 9 wood screws (IS 451).
• Tolerances: Dimensions have ±1 to ±3 mm tolerances depending on size (see Table 1).

Key Dimensional Table (Excerpt from Table 1):

Sampling & Acceptance Criteria (Table 2):

Summary:

• Use Grade Fe 410 W mild steel rods.
• Maintain dimensional tolerances as per Table 1.
• Provide 8 mm square holes for carriage bolts and countersunk holes for wood screws.
• Finish should allow for corrosion protection (painting/galvanizing

IS 281 — Marking, Sampling & Specifications for Sliding Door Bolts

1. Marking Requirements (Clause 9.1.1 & 9.1.1.1)

• Each bundle/box must have a label showing:
  • Manufacturer's name or trademark
  • Type
  • Size
  • Quantity of door bolts
• Use of BIS Standard Mark governed by BIS Act 1986; license required for usage.

2. Sampling & Criterion for Conformity (Annex A, Clause 1.2 & 3.15)

3. Key Dimensions for Mild Steel Sliding Door Bolts (Table 1)

• Holes: 8 mm square for 1/4" carriage bolts

IS 281 Packaging Specifications for Sliding Door Bolts

Packing Requirements (Clause 9.1.1.1):

• Sliding door bolts shall be wrapped in strong paper.
• Packed in bundles or cardboard boxes.
• Each bundle/box must have a label showing:
  • Manufacturer's name or trademark
  • Type
  • Size
  • Quantity of door bolts

Key Dimensions & Hole Specifications (Table 1)

• Holes are drilled and countersunk for wood screws (Designation No. 9 as per IS 451).
• 8 mm square holes are for 1/4" carriage bolts.

IS 281: Sampling and Criterion for Conformity

Sampling Plan (Clause 1.2, Table 2)

• Lot: Group of door bolts manufactured under similar conditions.
• Sample Size: Number of bolts randomly selected for inspection.
• Acceptance Criterion: Maximum number of defective bolts allowed in the sample.

Additional Specification (Clause 1.25)

• For 375 mm and 450 mm bolts, provide one extra supporting clip made of 1.25 ± 0.10 mm thick mild steel sheet, length 31 + Imm.

Key Points:

• Sampling size increases with lot size.
• Zero defects allowed for small lots (≤200).
• Defect tolerance increases with lot size.
• Sampling ensures quality control without testing every item.

Summary Diagram of Sampling Process

flowchart TD
    A[Start: Define Lot Size] --> B{Lot Size?}
    B -->|≤ 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 -->|>800| G[Sample 55 bolts]
    C --> H[Inspect Sample]
    D --> H
    E --> H
    F --> H
    G --> H
    H --> I{Defect Count ≤ Permissible?}
    I -->|Yes| J[Accept Lot]
    I -->|No| K[Reject Lot]

This ensures consistent quality by statistically validating batches of door bolts as per IS 281.

IS 281 - Testing Requirements for Door Bolts

Sampling & Acceptance Criteria (Table 2)

Key Points:

• Sample size is based on the lot size (Clause A-1.2).
• A lot passes if defective bolts ≤ permissible number (Clause A-2.1).
• For 375 mm and 450 mm bolts, provide an extra supporting clip of length 31 + Imm, thickness 1.25 ± 0.10 mm mild steel sheet (Clause 1.25).

Summary Flow of Testing

flowchart TD
    A[Start: Identify Lot Size] --> B{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[Inspect Sample]
    D --> H
    E --> H
    F --> H
    G --> H
    H --> I{Defective bolts ≤ Permissible?}
    I -->|Yes| J[Lot Accepted]
    I -->|No| K[Lot Rejected]

Use this table and flow to ensure compliance during door bolt testing per IS 281.

IS 281: Sampling and Criterion for Conformity

1. Sampling Plan & Acceptance Criteria (Table A-2, Clause 1.2)

• This sampling plan ensures that lots with ≤1.5% defectives are accepted most of the time (Clause 1.5).

2. Additional Specification (Clause 1.25)

• For 375 mm and 450 mm bolts, provide one extra supporting clip made of 1.25 ± 0.10 mm thick mild steel sheet, length 31 + 1 mm.

3. Dimensional Specifications (Annex A, Clause 11, Table 1)

• Bolt sizes range from 150 mm to 450 mm with detailed dimensions (A, B, C, E, G, H, J, T).
• Holes: 8 mm square holes for 1/4" carriage bolts and countersunk holes for No. 9 wood screws (IS 451).
• Number of rivets, screws, and carriage bolt holes specified per size.

Summary Diagram of Sampling Process

flowchart TD
    LotSize[Lot Size]
    LotSize -->|Up to 200| Sample15[Sample 15]
    LotSize -->|201-300| Sample20[Sample 20]
    LotSize -->|301-500| Sample30[Sample 30]
    LotSize -->|501-800| Sample40[Sample 40]
    LotSize -->|801+| Sample55[Sample 55]

    Sample15 --> Accept0[Accept if ≤ 0 defective]
    Sample20 --> Accept1[Accept if ≤ 1 defective]
    Sample30 --> Accept2[Accept if ≤ 2 defective]
    Sample40 --> Accept2b[Accept if ≤ 2 defective]
    Sample55 --> Accept3[Accept if ≤ 3 defective]

**Use

IS 281: Committee Composition & Key Specifications

Committee Composition (Annex B)

• Builder's Hardware Sectional Committee, CED 15 includes representatives from:
  • Allied Anodisers, Argent Industries, Builders Association of India, BMTPC, and many others.
  • Key members such as Shri B. Majumdar (Chairman), Shri Sushil Tawar, Shri R.P. Agrawal, and alternates.
  • Representatives from government bodies: Central Building Research Institute, CPWD, DDA, Ministry of Railways, NTPC, etc.
  • BIS Directorate General is represented by Shri A.K. Saini (Scientist 'F' and Head, CED).

Sampling & Acceptance Criteria (Clause 1.2, Table 2)

• Note: Sampling plan accepts lots with ≤1.5% defectives most times.

Key Dimensions for Mild Steel Sliding Door Bolts (Table 1 excerpt)