Fort Worth Gasket & Supply stocks
domestic built bolts and nuts and will furnish a certification from the
domestic factory when requested. We import directly from overseas plain, zinc plated,
cad plated, hot dip galvanized hex
machine bolts, cap screws, finished and heavy hex nuts, flat
washers and fender washers. We
also cut and stock low carbon, B7, and S/S all thread rods and studs.
We stock brass water meter flanges and flange
We package flange bolt sets with gaskets in a pizza style box, shrink wrapped
or in individual boxes without the gasket.
joints only require ASTM A 307
GRADE A or B HEX BOLTS and ASTM A 563 A or B NUTS.
We ship a variety of flange bolt set sizes that conform to AWWA pipe size
recommendations. All bolts and nuts meet the requested ASTM
specification. Common specifications that we ship bolts and nuts
SAE J 429 grade 5 and grade 8 (ASTM A 354-BD), ASTM A193, B7, B8,
and A194, GD 2H, ASTM A307 Grade A / B and A563 Grade A / B, and ASTM A 325. We also
assemble bolt sets using alloy steel such as S/S 316 and 304.
Our bolts meet the ANSI / ASME general and dimensional standards B18.2.1,
our nuts meet B18.2.2. specifications. Length and diameter of flange
bolt sets conform to ASME 16.5 specifications. We can furnish other grades in the 300 and 400
series of stainless steel as well as brass and bronze. We furnish
domestic built bolt sets when requested and will also furnish a
certification from the factory when requested.
PATTERNS and TORQUE VALUES
To make a good seal at a pipe joint it is important that the bolts be
tightened in the proper pattern to the proper torque value.
Click above to see the patterns and torque values.
For reference we have included some standard bolt sizes for pipe flange
bolt sets. However all
applications are not standard and you should check your flange dimensions
if ordering something special and for pipes above 24 inches (click bolt
sizes above for the normal bolt sizes).
There is a large variation in bolt length on butterfly valves above 12
inches. There will be some
bolts that go into a tapped hole in the body of the valve requiring
shorter bolts. You must check
with the valve manufacture for the recommended bolt size. Most manufactures recommend studs rather than bolts for