NM01X0000011

The Bolting Reference Standard, 4140 Steel, 3" Diameter is a precisely machined calibration block specifically designed for ultrasonic testing (UT) of bolts and threaded fasteners. Made from high-strength 4140 steel, a chromium-molybdenum alloy known for its toughness and hardenability, this reference standard provides a reliable medium for calibrating and verifying ultrasonic equipment used in bolt tension monitoring and flaw detection.

The 3" diameter offers a substantial and stable platform for consistent ultrasonic coupling. This reference standard typically incorporates simulated flaws or features at specific depths and orientations to allow technicians to:

• Calibrate Time-of-Flight Measurements: Essential for accurate bolt elongation and tension calculations.

• Determine Sensitivity Levels: Ensuring the ultrasonic system can reliably detect critical flaw sizes.

• Verify Transducer Performance: Assessing the consistency and effectiveness of the ultrasonic transducer being used.

• Establish Acceptance Criteria: By comparing signals from the reference standard to those from actual bolts under inspection.

Key Features:

• Material: High-strength 4140 Steel, offering consistent ultrasonic properties.

• Diameter:3 inches, providing a stable and ample surface area for testing.

• Simulated Flaws/Features: Incorporates precisely machined reflectors (e.g., flat-bottom holes, side-drilled holes, notches) at specific locations and sizes to simulate common bolt defects or features related to bolt length measurement.

• Precision Machining: Manufactured to tight tolerances to ensure accurate and repeatable ultrasonic responses.

• Material Certification (Typically Included): Often comes with a material certificate verifying the 4140 steel composition.

• Protective Case (May be Included): Some standards are supplied with a protective case for storage and transport.

Benefits:

• Ensures Accurate Bolt Testing: Provides a reliable reference for calibrating and verifying ultrasonic bolt tension monitors and flaw detectors.

• Facilitates Consistent Inspections: Allows for the establishment of repeatable testing procedures.

• Supports Quality Control: Helps ensure the integrity and safety of bolted joints.

• Durable Construction: Made from robust 4140 steel for long-lasting use.

• Application-Specific Design: Tailored for the unique challenges of ultrasonic bolt inspection.

Applications:

• Calibration of ultrasonic bolt tension monitoring equipment.

• Verification of ultrasonic flaw detectors used on bolts and threaded fasteners.

• Development of inspection procedures for bolted joints in various industries, including construction, manufacturing, and infrastructure.

• Training and qualification of ultrasonic testing personnel for bolt inspection.

• Quality control during the manufacturing and installation of critical bolted connections.