Fasteners Flashcards
What are five ways of removing a seized nut?
Penetrating oil, Use heat, Nut splitting, Use a hammer an chisel, Use a hack saw to cut threads.
Thread restoring inserts can provide stronger threads in soft or weak materials?
True
A threaded coil insert is large in diameter than its prepared hole?
True
A bolt with a cross sectional area of 2 square inches and weight of 14 000 lbs hanging from it is under tension of?
7000 psi
How do you prevent wall dilation from occurring in a nut?
Increase wall thickness
a lubricated fastener achieves the same pre load as a dry fastener when torqued to the same setting?
False
What problems are caused by undertorquing and overtorquing?
Bolts may snap or come off, Bolts may become loose an allow parts to vibrate, sub components me be crushed, all of the above
You are using a 24 inch torque wrench with a 6 inch adapter, the adapter extended straight out, recommended torque is 355 ft-lb, with out the extension you would set the wrench for 355 ft lb, what is your setting now?
24/30=.8x355=284 ft lb
How is a bolt tensioned in a hydraulic nut tensioning set up?
Axial force
What are the advantages of using multi-jackbolt fasteners over other tensioning?
Tension without gulling, higher tension rate.
When exposed to air, anaerobic sealers cure to a firm but flexible silicone like material.
False
The primary function of an adhesive is to?
Hold parts together.
Dowel pins are?
Hardened and ground steel.
The primary purpose of sealant is?
To exclude dust, dirt, and moisture.
What do marks on the end of the bolt indicate?
Grade and tensile strength.
The pitch diameter of a thread is measured exactly halfway between the major and minor diameters.
False
A thread is designated as 5/8 - 11 UNC - 2B, is this external or internal thread?
Internal.
What is the taper per foot of an NPT thread?
3/4 inch taper per foot.
What are the names of each part of a thread?
Thread angle, crest, root, pitch, single depth of thread.
The designation that identifies a nut is?
5/16-18 UNC - 1B the B is internal thread
Marks on the head bolt indicate the?
Grade and tensile strength.
A thread is designated 5/8-11 Class 2 A.
Is an external thread.
Which type of torque wrench is best for achieving a pre set amount of torque?
Click type
