STS Industrial - Bolts & Screws

 

ASTM A193 GRADE B7 HEAVY HEX HEAD BOLTS

GOVERNING STANDARDS:
ASTM A193 Standard specification for alloy-steel and stainless steel bolting for high temperature or high pressure service and other special purpose applications.
ASME B18.2.1 Covers the complete general and dimensional data for multiple types of inch series square and hex bolts and screws.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

 

APPLICATIONS:

Common / economical heavy hex bolt for use in high temperature and high pressure applications in refineries, chemical plants, pipelines, power plants, and other industries. High strength hex bolt with heavy pattern head to increase the bearing surface, and distribute the clamping load over a larger area. Bolts having diameters above 1″ are available in both UNC (coarse thread) and UN8 (8 threads per inch).

ASTM A193 Grade B7 Heavy Hex Head Bolt Head Marking

Product to be marked with the manufacturers head marking as indicated by the X.

  • OPTIONAL COATINGS

    FluroKote1® Fluoropolymer coating is formulated with superior characteristics for maximum fastener life. Technical components include a tensile strength of up to 4,000 psi and an operating pressure up to 100,000 psi. The absence of nut locking oxides enable easy and safe removal. FluroKote1® has extreme chemical resistance and is ideal for applications including insulating piping, boiler rooms, water filled piping, water lines and more.

    Due to its unique benefits, FluoroKote#1® applications have been used for various types and grades of fasteners. The water works industry takes advantage of the superior corrosion resistance properties by coating T-head bolts for underground service. Stainless steel fasteners, used in many different industries, are coated for lubricity and anti-galling. The most widely used application is on B7 studs with 2H nuts. These fasteners are commonly used by turnaround groups, operations and maintenance departments, and contractors at many chemical plants, refineries, and offshore platforms.

 

MATERIAL PROPERTIES:
Chromium- Molybdenum Alloy Steel, AISI 4140, 4142, 4145, 4140H, 4142H or 4145H Quenched and Tempered

DIAMETER

PROOF LOAD

YIELD STRENGTH

TENSILE STRENGTH

CORE HARDNESS

up through 2″

105,000 psi 125,000 psi

C35 Max

Elongation 16% Minimum for diameters through 2″
Reduction of Area 50% Minimum (All Diameters)
Material strengths listed are minimum acceptable per governing standard. Core hardness based on Rockwell scale.
DIMENSIONAL SPECIFICATIONS:

ASTM A193 Grade B7 Heavy Hex Head Bolt Dimensions

Sources: ASTM Standards for Mechanical Fasteners and Related Processes 2nd Edition, Inch Fastener Standards 8th Edition, Kanebridge Fastener Reference Guide 4th Edition

Note: All material included on this page is informational only, and should not be used as one’s sole source for design purposes. STS Industrial, Inc. and its affiliates do not guarantee the accuracy of the information on this site, and retain no liability for the use or misuse of the information contained on this site.