Fasteners(Bolts and Nuts)

7/29/2019 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
http://www.boltdepot.com/Metric_hex_bolts.aspxhttp://www.boltdepot.com/Metric_hex_bolts.aspx


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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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Fasteners(Bolts and Nuts)

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