Allen bolts are characterized by___________________?
Show answer Hide answer
Answer: D. provided with hexagonal depression in head
Explanation
Allen bolts are mechanically identified by their internal hexagonal driving socket depression in the bolt head. This internal hex socket allows a hexagonal wrench to apply high tightening torque in restricted spaces. The recessed head design prevents tool slippage and protects the fastener head from external damage. Allen bolts, also known as socket head cap screws, are widely used in precision machinery and tooling applications. The hexagonal socket permits closer spacing of fasteners since wrenches do not require external clearance around the head. Alloy steel materials are commonly used to manufacture high strength Allen bolts for demanding industrial uses.
Option A is incorrect because self-locking bolts require special thread geometry rather than a recessed head. Options B and C describe possible applications, but the defining physical characteristic is the internal hex socket. Option E is wrong because uniform strength bolts refer to shank necking designs rather than head socket features.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Aircraft structures are typically fabricated through_________________?
Show answer Hide answer
Answer: C. rivetting
Aircraft structures are predominantly assembled using structural riveting techniques to join thin metal sheets. Riveting prevents heat-induced metallurgical damage associated with traditional welding processes on thin al...
Q2. At low temperatures (e.g., 75°C), steel notched-bar impact values____________________?
Show answer Hide answer
Answer: B. decreases markedly
Ferritic steels experience a well documented ductile to brittle transition temperature range. Lowering the temperature causes notched bar impact strength values to drop dramatically and rapidly. Impact energy absorption...
Q3. An Allen bolt is defined as___________________?
Show answer Hide answer
Answer: C. provided with hexagonal depression in head
An Allen bolt or socket head cap screw features a recessed hexagonal socket in its head. An Allen wrench or hex key is inserted into this hexagonal depression to tighten the fastener. This recessed design allows fastener...
Q4. A basic shaft is defined as one where__________________?
Show answer Hide answer
Answer: A. whose upper deviation is zero
According to ISO international fit standards, a basic shaft is defined by its upper deviation limit. The upper deviation for a basic shaft is precisely zero, meaning its maximum allowable limit equals nominal size. All m...
Q5. An elastic nut serves as a locking fastener wherein__________________?
Show answer Hide answer
Answer: C. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
Elastic lock nuts feature a built in polymer or nylon insert inside the upper recess. As the bolt threads advance, they permanently cut mating threads into the nylon material. The tight frictional grip generated by the d...
Q6. A castle nut functions as a locking mechanism featuring__________________?
Show answer Hide answer
Answer: D. through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
A castle nut features slotted cutouts on top that resemble medieval castle battlements. A cotter pin passes through these slots and a drilled hole in the bolt shaft. Splitting and bending the cotter pin ends in reverse d...