ASTM E1685
Standard Practice for Measuring the Change in Length of Bolts Using the Ultrasonic Pulse-Echo Technique
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About This Item
ASTM E1685 is the standard practice for measuring the change in length of bolts using the ultrasonic pulse-echo technique. It provides a controlled approach for evaluating bolt length change without relying on destructive testing, which can be useful when assessing installed fasteners or monitoring dimensional variation. By defining a repeatable ultrasonic method, the standard supports more consistent measurement results for engineering, inspection, and quality-related work where fastener length matters.
ASTM E1685 standard overview
The ASTM E1685 standard addresses a specific ultrasonic method for measuring bolt length change with a pulse-echo technique. As a practice, it is intended to guide how the measurement is performed so results are more consistent across users and applications. This makes the document relevant for technical teams that need a reliable way to compare bolt length conditions, track changes over time, or support inspection procedures tied to dimensional control and verification.
Where is ASTM E1685 used?
This standard is commonly used in laboratory, inspection, and field measurement workflows where bolts must be evaluated without removing them from service. It is especially relevant when ultrasonic equipment is used to assess fastener length change in support of maintenance checks, acceptance testing, or product evaluation. ASTM E1685 is also useful in settings where measured bolt condition affects assembly integrity, documentation, or follow-up analysis of installed hardware.
Practical importance of ASTM E1685
The practical value of ASTM E1685 lies in providing a recognized method for more consistent bolt length measurement. That consistency can help reduce uncertainty in testing, support procurement and compliance needs, and improve quality control decisions. For organizations working with critical fasteners, a standard practice like this may also help reduce risk by making measurement results easier to compare, document, and review across different inspections or operators.
- Ultrasonic pulse-echo measurement method
- Bolt length change assessment
- Non-destructive evaluation approach
- Inspection and verification support
- Repeatable technical measurement practice
- Publication Date: 2020-12-07
- Publisher: ASTM
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