Acronym Definition
UMJT Universal Maintenance Job Tracking
UMJT Universal Management Joint Trust
UMJT Universal Mechanical Joint Tightness
UMJT University Moral Judgement Test
UMJT Universal Multi-Jackbolt Tensioners
UMJT Union Museum of Jurassic Technology
UMJT Universal Multi-Jackbolt Tensioners
The Superbolt, or Multi-Jackbolt Tensioner is an alternative type of fastener
that retrofits or replaces existing nuts, bolts, or studs. Tension in the bolt
is developed by torquing individual jackbolts which are threaded through the
body of the nut and push against a hardened washer. Installation and removal of
any size tensioner is achieved with hand tools, which can be advantageous when
dealing with large diameter bolting applications.
Types of screws and bolts
Combination flanged-hex/Phillips-head screw used in computersA hex cap screw has
a protruding hexagonal head, designed to be driven by a spanner or wrench.
A socket cap screw has a hexagonal recessed drive, usually with a cylindrical
head, but can also be found with a rounded button head or a countersunk flat
head.
Wood and chipboard screws have a tapered shaft. A hole of about the diameter of
the shaft, but less than the diameter of the thread, is often drilled into the
wood; screws can be driven into undrilled wood, but there is a risk of splitting
the workpiece. Chipboard is less likely to split. A hole can be drilled in
brick, concrete, or other hard materials, and a wall plug inserted; a woodscrew
can then be driven into the plug.
Lag screw, lag bolt or coach screw refers to a large wood screw with a head,
square or hexagonal, driven by a wrench rather than a screwdriver.
A Machine screw has a cylindrical shaft, threaded its entire length, and fits
into a nut or a tapped hole.
Self-tapping screws or thread cutting screws have sharp threads that cut into a
material such as sheet metal or plastic. They are sometimes notched at the tip
to aid in chip removal during thread cutting.
A Self-drilling screw is similar to a self-tapping screw, but has a drill-shaped
point to cut through the material without prior drilling.
Thread rolling screws have a lobed (usually triangular) cross section. They form
threads by pushing outward during installation. They may have tapping threads or
machine threads.
A Drywall screw is a specialized self-tapping screw designed to bind drywall to
wood or metal studs, but it has proven to be a versatile construction fastener.
A Set screw, used to prevent loosening due to vibration, is available with thumb
screw, square head, Hex head (inset socket) and, most commonly, headless (a grub
screw in UK parlance, designed to be inserted flush with or below the surface of
the work piece). Alternatively defined to be a screw whose thread reaches the
head (if any), as opposed to a bolt.
Dowel screw is a wood screw with two pointed ends and no head, used for making
hidden joints between two pieces of wood.
A wood screw being driven into a board with a drillA stud is similar to a bolt
but without the head. Studs are threaded on both ends. In some cases the entire
length of the stud is threaded, while in other cases there will be an unthreaded
section in the middle. It may be anchored in concrete, for example, with only
the threads on one end exposed. (See also: screw anchor, wedge anchor.)
An Eye bolt used for attaching cables to a surface.
A carriage bolt or coach bolt has a domed or countersunk head, and the shaft is
topped by a short square section under the head. The square section grips into
the part being fixed (typically wood), preventing the bolt from turning when the
nut is tightened. A rib neck carriage bolt has several longitudinal ribs instead
of the square section, to grip into a metal part being fixed.
A stove bolt is similar to a carriage bolt, but usually used in metal. It
requires a square hole in the metal being bolted to prevent the bolt from
turning.
The Superbolt, or Multi-Jackbolt Tensioner is an alternative type of fastener
that retrofits or replaces existing nuts, bolts, or studs. Tension in the bolt
is developed by torquing individual jackbolts which are threaded through the
body of the nut and push against a hardened washer. Installation and removal of
any size tensioner is achieved with hand tools, which can be advantageous when
dealing with large diameter bolting applications.
Acme screw form has threads that are stronger and broader than standard
V-profile threads, making them much better for load carrying, linear actuating
(also see ball screws), and quick threading. It is often used for vise screws.
A Shoulder Screw is a screw used for revolute joints in mechanisms and linkages.
The main shank of the screw is smooth and works as a suitable bearing surface.
At the end of the cylindrical bearing surface is a reduced diameter thread.
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RuneScape takes place in the fantasy-themed realm of Gielinor, which is divided
into several different kingdoms, regions, and areas. Players can travel
throughout the gaming world on foot, by using magical teleportation spells or
devices, or mechanical means of transportation. Each region offers different
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