Bolts Gaskets & Fasteners

Bolts Gaskets & Fasteners

Intercoastal Sales stocks a full line of Fasteners for flanged, tray, angle, tube clip, and other connections.

Products: Stud Bolts, Hex Head Bolts, Carriage Bolts, Machine Bolts, Wedge Anchor Bolts, U-Bolts, Heavy Hex Nuts, Flat Washers and Lock Washers. Gaskets include Non-Asbestos Ring, Spiral Wound, Inner and/or Outer Ring, 304 SS, 316SS and Carbon Steel, PTFE, Teflon, Graphoil, Rubber, Neoprene, etc.

Material: B7 Black, B8 Stainless, B7 Cad Plated, Hot Dipped Galvanized, Electro-Plated Galvanized, Teflon Xylon Coated, and other alloys available.

Stud Bolts
With flange connections, Stud Bolts are typically used to join two flanges together in conjuntion with a gasket to make a tight seal. The quantity of bolts for a flange connection will be given by the number of bolt holes in a flange. The diameter and length of bolts is dependent of flange type and Pressure Class of flange.Click Here for Stud Bolt Sizing Chart.

Dimensions from Stud Bolts are defined in the ASME B16.5 standard. The material qualities for studs are defined in the different ASTM standards, and are indicated by Grade. Frequently used grades are A193 for the threaded studs and A194 for the nuts.

ASTM A193 covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.

ASTM A194 covers a variety of carbon, alloy, and stainless steel nuts. These nuts are intended for high-pressure or high-temperature service, or both.

Below you will find as an example a table with materials and grades for flanges, bolts and nuts, arranged on design temperature, flanges, studs and recommended nuts.

-195° to 102°C ASTM A 182
Gr. F304, F304L, F316,
F316L, F321, F347
A320 Gr. B8 Class 2A194 Gr. 8A
-101° to -47°CASTM A 350
Gr. LF3
A 320 Gr. L7A 194 Gr. 7
-46° to -30°CASTM A 350
Gr. LF2
A 320 Gr. L7A 194 Gr. 7
-29° to 427°CASTM A 105A 193 Gr. B7A 194 Gr. 2H
428° to 537°CASTM A 182
Gr. F11, F22
A 193 Gr. B16A 194 Gr. 2H
538° to 648°CASTM A182
Gr. F11, F22
A 193 Gr. B8 Class 1A 194 Gr. 8A
649° to 815°CASTM A182
Gr. F304 H, F316 H
A 193 Gr. B8 Class 1A 194 Gr. 8A

Flange gaskets are used to create a static seal between two flanges faces, at various operating conditions, with varied pressure and temperature ratings. A gasket fits on the flange faces, and forms a seal that is designed to prevent leakage of liquids and gases. Types of gaskets

Materials for gaskets can be divided into three main categories:

Non-Metallic types - usually composite sheet materials are used with flat-face and raised-face flanges in low Pressure Class applications. Non-metallic gaskets are manufactured from arimid fiber, glass fiber, elastomer, Teflon® (PTFE), graphite etc.. Full-face gasket types are suitable for use with flat-face flanges. Flat-ring gasket types are suitable for use with raised face flanges. ASME B16.21 covers types, sizes, materials, dimensions, dimensional tolerances, and markings for non-metallic flat gaskets.

Semi-Metallic types - composites of metal and non-metallic materials. The metal is intended to offer strength and resiliency, while the non-metallic portion provides conformability and sealability. Often used semi-metallic gaskets are spiral wound and camprofile, and a variety of metal-reinforced graphite gaskets. Semi-metallic are designed for almost all operating conditions and high-temperature and pressure applications, and are used on raised face, male-and-female, and tongue-and-groove flanges. ASME B16.20 covers materials, dimensions, dimensional tolerances, and markings for metallic and semi-metallic gaskets.

Metallic types - fabricated from one or a combination of metals to the desired shape and size. Often used metallic gaskets are ring-type-joint gaskets (RTJ). They are always applied to special, accompanying flanges which ensure good, reliable sealing with the correct choice of profiles and material. Ring Type Joint gaskets are designed to seal by "initial line contact" or wedging action between the mating flange and the gasket. By applying pressure on the seal interface through bolt force, the "softer" metal of the gasket flows into the microfine structure of the harder flange material, and creating a very tight and efficient seal. ASME B16.20 covers materials, dimensions, dimensional tolerances, and markings for metallic and semi-metallic gaskets.

Typical Sprial Wound Gasket:Click Here for Color Chart.

Manufacturers include: Garlock, Lamons, Flexitallic, Utex.