October 18, 2025
Adjustment and blocking thread---fastener expertise (easy to ask questions 5)
**Fastener Knowledge and Q&A – Easy to Tighten**
Fastener Expertise Q & A
No. 5
**Phase 5: Threads used for adjustment or blocking should be ______.**
A. Triangular coarse thread
B. Rectangular thread
C. Zigzag thread
D. Triangular fine thread
**Review: Easy to Ask Questions – Stage 4**
Triangular fine thread has better self-locking properties and higher tensile strength of the nail rod.
Compared with the coarse thread, the triangular fine thread of the same nominal size has a smaller pitch and a smaller diameter due to the fine thread, so the **_______** of the fine thread.
A. Good self-locking property, low tensile strength of the nail rod
B. Good self-locking property, high tensile strength of the nail rod
C. Poor self-locking property, high tensile strength of the nail rod
D. Poor self-locking property, low tensile strength of the nail rod
*(Strength – refers to the carrying capacity of the threaded rod.)*
**Answer Diagram:**
*Triangular fine thread has better self-locking performance.*
*Triangular fine-threaded shank has high tensile strength.*
In fastener design, choosing between coarse and fine threads is crucial. Fine threads offer more precise adjustments and better locking characteristics, making them ideal for applications where vibration or movement could loosen the connection. However, their smaller diameter may affect overall strength. Understanding these differences helps engineers and technicians select the right fastener for each specific use case.
TC Bolts, Tension Control Bolts, A325 TC Bolts, A490 TC Bolts, High Tension Bolts
Ningbo Brightfast Machinery Industry Trade Co.,Ltd , https://www.brightfastener.com