technical of HALF INCH X 6 INCH SHOULDER EYE BOLT
1. Ultimate Tensile Strength (UTS)
1. UTS defines the maximum force the eye bolt can handle before failing or deforming.
2. The shoulder design enhances lateral load resistance.
3. Load tested as per ASTM A489 / A193 / IS 4190 standards.
2. Working Load / Safe Working Load (SWL)
1. SWL is calculated with a safety factor of 4–5, depending on application (vertical, angular, or side pull).
3. Conductor Diameter Compatibility
1. While eye bolts do not clamp conductors directly, they serve as an anchoring or linking point for:
I. Stay wires
II. Suspension fittings
III. Clevis and clamps
4. Slip Strength:
1. Shoulder eye bolts resist movement under axial and side load due to:
I. Thread length engagement ≥ 50 mm
II. Use with locking washers or nuts
III. Proper torque tightening
2. Field-tested with dynamic tension pull and vibration scenarios.
5. Temperature Withstanding Capacity:
1. Designed for harsh outdoor conditions and thermal variation caused by conductor load/faults.
2. No deformation or material degradation within range.
6. Corrosion Resistance:
1. Typically finished with Hot-Dip Galvanizing (HDG), which protects against oxidation, rust, and chemical attacks.
2. Passes 500–1000 hour Salt Spray Test (ASTM B117) for marine/coastal deployment.
7. Impact & Fatigue Strength:
1. Shoulder Eye Bolts are subject to dynamic line loads, pole sway, and guy tension adjustments.
2. Vibration fatigue tested over time to simulate wind galloping and shock loading conditions.
Top 5 Quality Assurance
1. Material Testing
a. Raw steel tested for:
I. Tensile Strength
II. Yield Strength
III. Elongation
IV. Carbon & Alloy Composition
2. In-Process QA
a. Threads checked with:
I. Go/No-Go gauges
II. Thread pitch verifiers
b. Visual inspection for surface defects and bend uniformity
c. Shoulder positioning accuracy verified by calipers
3. Routine Testing
I. UTS Test using Universal Testing Machines
II. Slip & Torque Test under dynamic load
III. Coating thickness test using Elcometer
IV. Salt spray corrosion testing for HDG
4. Certifications & Compliance
a. Conforms to:
I. IS 4190 – Eye bolts for overhead lines
II. ASTM A489 / A307 / F541 – Forged eye bolts
III. IS 1367 – Mechanical properties
b. QA Documents provided:
I. Mill Test Certificate (MTC)
II. Galvanizing Certificate
III. Dimensional Inspection Report
IV. Lot Number / Heat Number Traceability