fasteners(bolts and nuts)
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FASTENERS
-Manojkum
Engg-Mec
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Fasteners
Bolts Nuts
Washers
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Bolt
Bolts are typically used to fasten two oobjects together through pre-drilled ho
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Types of fasteners
Hex bolts, or hex cap screwsUsed in machinery and construction. Can
with a nut, or in a tapped hole. Fully thre
bolts are also known as tap bolts.
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Wood screws Have large threads and a smooth shan
pulling two pieces of material together
They can be used in wood and other so
materials.
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Sheet metal screws Have sharp points and threads, and are
to be driven directly into sheet metal.
They can also be used in softer materia
plastic, fiberglass, or wood
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Machine screwsThese are fully treaded for use with a nu
tapped hole. Certain types are sometime
to as stove bolts
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Socket screws
Are machine screws with an internal hex
(Allen) drive. Longer lengths may have a s
shank.
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Lag bolts, or lag screws
Are large wood screws with hex heads. Ty
used for wood construction and landscap
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Carriage bolts
Have smooth, domed heads with a squa
underneath that pulls into the material to
spinning during installation
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Head marking of bolts
Head MarkingClass and
Material
Nominal Size Range
(mm)
Mechanical Properties
Proof Load
(MPa)
Min. Yield Strength
(MPa)
Min
Metric bolts
8.8
Class 8.8
Medium Carbon Steel,
Quenched and
Tempered
All Sizes below 16mm 580 640
16mm - 72mm 600 660
10.9
Class 10.9
Alloy Steel, Quenched
and Tempered
5mm - 100mm 830 940
12.9
Class 12.9
Alloy Steel, Quenched
and Tempered
1.6mm - 100mm 970 1100
Stainless markings vary.
Most stainless is non-
magnetic.
Usually stamped A-2
A-2 Stainless
Steel alloy with 17-
19% Chromium and 8-
13% Nickel
All Sizes thru 20mm210 Min.
450 Typical
Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or frac
Yield Strength: The maximum load at which a material exhibits a specific permanent deformation
Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.
1MPa = 1N/mm2
= 145 pounds/inch2
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Nut
A nut is a type of fastener with a thread
Nuts are almost always used opposite a
mating bolt to fasten a stack of parts t
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Nut The two partners are kept together by
combination of their threads' friction, astretch of the bolt
In applications where vibration or rotawork a nut loose, various locking mech
may be employed: Adhesives, safety pior lockwire nylon inserts, or slightly ovathreads
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Types of nut
Hex
A six sided nut. Also
referred to as a
finished hex nut.
Nylon Insert Lock
A nut with a nylon
insert
to prevent backing
off.
Also referred to as aNylock
Jam
A hex nut with a
reduced height.
N
A
r
http://www.boltdepot.com/Browse.aspx?Category=Nuts&Subcategory=Hex_jam_nylon_lock_nutshttp://www.boltdepot.com/Browse.aspx?Category=Nuts&Subcategory=Hex_jam_nutshttp://www.boltdepot.com/Browse.aspx?Category=Nuts&Subcategory=Hex_lock_nuts_nylon_inserthttp://www.boltdepot.com/Browse.aspx?Category=Nuts&Subcategory=Hex_nuts -
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Types of nut
Wing
A nut with 'wings'
for hand tightening.
Cap
A nut with a domed
top over the end of
the fastener.
Acorn
Acorn nuts are a
high crown type of
cap nut, used for
appearance.
A n
w
http://www.boltdepot.com/Browse.aspx?Category=Nuts&Subcategory=Acorn_nutshttp://www.boltdepot.com/Browse.aspx?Category=Nuts&Subcategory=Cap_nutshttp://www.boltdepot.com/Browse.aspx?Category=Nuts&Subcategory=Wing_nuts -
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Types of nut
Coupling
Coupling nuts are
long nuts used to
connect pieces of
threaded rod or
other male threadedfasteners.
Slotted
Slotted nuts are
used in conjunction
with a cotter pin on
drilled shank
fasteners to preventloosening.
Castle
Castle nuts are
similar to slotted
nuts but with the
slots in a rounded
section above themain nut.
http://www.boltdepot.com/Castle_nuts.aspxhttp://www.boltdepot.com/Slotted_nuts.aspxhttp://www.boltdepot.com/Coupling_nuts.aspx -
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