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DIFFERENT KINDS OF
FASTENERS USED IN PIPING STUD BOLT
Stud has a thread on full
lengths or at both ends. As shown in images. It is having
three components if washers are not used (two nuts and
stud). If you used washer, it would become five. Sommes
additional nuts are used for hydraulic tensioning with
larger size stud.
The length of stud bolt
should be enough to cover crane Nut plus 1.5 to 3 threads
exposed. Long studs must be avoided as it increases the
chance of corrosion and other damage to exposed threads,
which would make subsequent removal difficult. ASME B16.5
gives the required size of the stud.
Length of the stud depends
on the type of gasket and the maximum exposed thread
requirements.
List of ASTM
Material grade used for manufacturing stud is given in
ASME B16.5, which is the Standard for the flanges. For
high temperature and pressure services ASTM A193 Gr B7,
B7M, B5, B8 are used.
For low-temperature services ASTM A320 Gr L7, L7A, L7B are
used. ASTM A354 Gr BC, BD is material grades for alloy
steel quenched and tempered studs and bolts. For special
application ASTM A540 Gr B21 to B24 are used. Out of these
grades, most popular material grades are ASTM A193 Gr B7 &
B7M.
TYPES
:
Stud Bolt, Matching Bolt, Anchor Bolt, etc.
STANDARD
:
ASTM A193 GRADE B7 STUD BOL
PRESSURE CLASS :
150#, 3000#, 6000#, 9000# 15000#
CARBON STEEL
:
ASTM A193 Gr. B7, B8, B8M, B16, B6, B5, B8T, B8MA,
(High Temperature / Pressure Service Bolts).
ASTM 320-L7,
L7M, L43, B8, B8M, B8T, B8MA,
(Low Temperature Service
Bolts)
STAINLESS STEEL :
SUS/SA 304, 304L, 316, 316L
OTHER MATERIALS :
Monel, Nickel, Inconel, Hastelloy, Copper, Brass, Bronze,
Titanium, Tantalum, Bismuth, Aluminum,
High Speed Steel,
Zinc, Lead, etc.
COATING STD
:
Zinc Electroplating, Hot Dip Galvanizing, Hot Dip
Aluminum
Plating, Dichromat Plating, Chrome Plating,
Cadmium
Electroplating, PTFE Coating, Xylan Coating.
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