millwright Level1 module 3 Fasteners and
Anchors Exam Questions and Answers with
Verified Solutions | Latest Updated 2026
unified national coarse(UNC) used for bolts,screws,nuts,and other
thread general
purposes. Fasteners with UNC threads are
commonly used for rapid assembly or
disassembly
of parts and where corrosion or slight
damage may
occur
unified national fine (UNF) thread used for bolts,screws,nuts,and other
applications
where a finer thread for a tighter fit is
desired
Unified National Extra Fine Used on thin-walled tubes,nuts,ferrules
(UNEF) and
thread couplings
class 3A and 3B provide a minimal clearance
class 1A and 1B provide maximum clearance
nominal size diameter of the fastener
Anchors Exam Questions and Answers with
Verified Solutions | Latest Updated 2026
unified national coarse(UNC) used for bolts,screws,nuts,and other
thread general
purposes. Fasteners with UNC threads are
commonly used for rapid assembly or
disassembly
of parts and where corrosion or slight
damage may
occur
unified national fine (UNF) thread used for bolts,screws,nuts,and other
applications
where a finer thread for a tighter fit is
desired
Unified National Extra Fine Used on thin-walled tubes,nuts,ferrules
(UNEF) and
thread couplings
class 3A and 3B provide a minimal clearance
class 1A and 1B provide maximum clearance
nominal size diameter of the fastener