Technical Of Collar Eye Bolt

1. Ultimate Tensile Strength (UTS)

1. Represents the maximum axial force the collar eye bolt can withstand without failure.

2. Manufactured from forged carbon steel or mild steel (MS) with high mechanical integrity.

3. Conforms to IS 4190, ASTM F541, and DIN 580 for lifting eye bolts.

2. Working Load / Safe Working Load (SWL)

1. SWL is calculated with a safety factor of 4–5, depending on application (vertical, angular, or oblique pull).

2. The collar design resists bending or shear during side pulls and ensures safety under load misalignment.

3. Conductor Diameter Compatibility

1. Collar Eye Bolts do not directly hold conductors but act as anchoring or connecting points for:
I. Suspension clamps
II. Guy/grip assemblies
III. Stay wire connections

4. Slip Strength:

1. Threaded portion ensures strong anchorage when combined with:
I. Lock nuts
II. Flat/spring washers

2. Collar prevents lateral movement or rotation under load.

3. Field-tested to maintain position under tension and vibration.

5. Temperature Withstanding Capacity:

1. Designed for outdoor usage, from cold climates to desert/high-heat zones.

2. Material retains strength and does not deform or corrode under thermal stress.

6. Corrosion Resistance:

1. Tested for salt spray corrosion (ASTM B117) for marine/humid environments.

7. Impact & Fatigue Strength:

1. Collar Eye Bolts are frequently exposed to:
I. Pole sway
II. Conductor vibrations
III. Shock loads (e.g. line fault)

2. Designed to resist deformation under oblique or shock loading.

Top 5 Quality Assurance

1. Material Testing
a. Steel grade verified via:
I. Tensile and yield strength tests
II. Chemical composition (spectrometer analysis)
III. Hardness testing

2. Dimensional & Thread Checks
a.Eye diameter, shank length, and collar thickness tested using:
I. Vernier calipers
II. Thread pitch gauges
III. Go/No-Go ring and plug gauges

3. Surface & Coating QA
a. Galvanizing thickness checked using Elcometer.
b. Visual inspection for zinc uniformity, burrs, or deformation.
c. Coating tested for adherence and salt-spray resistance.

4. Mechanical Testing
a. UTS and SWL verified using:
I. Universal Testing Machine (UTM)
II. Proof Load Testing
III. Slip and fatigue testing under cyclic tension.
IV. Batch sampling as per IS 1367, ASTM A489, or customer-specific QA plans.

5. Documentation & Traceability
a. Each batch supplied with:
I. Mill Test Certificate (MTC)
II. Coating Certificate
III. Inspection Report
IV. Lot Number / Heat Number Tags