STS Industrial - Bolts & Screws

 

ASTM A193 GRADE B8 STAINLESS STEEL STUD BOLTS

GOVERNING STANDARDS:
ASTM A193/A193M Standard specification for alloy-steel and stainless steel bolting for high temperature or high pressure service and other special purpose applications.
ASME B16.5 Covers recommended stud bolt quantity, diameter, and length for use in flanged pipe fittings.
ASME B1.1 Class 2A Specifies the thread form, series, class, allowance, tolerance, and desig nation for unified screw threads. UNC for 1″ diameter and smaller. UN8 (8 threads per inch) for 1-1/8″ diameter and larger.

 

APPLICATIONS:

Non-magnetic, 18-8 stainless with good corrosion resistance. Ideal for use in high temperature, high pressure applications where certain corrosives or harsh atmospheric conditions exist.

ASTM A193 Grade B8 Stainless Steel Stud Bolt Marking

Product to be marked with the manufacturer’s marking and grade marking on one end of each stud 3/8″ diameter and larger. Manufacturer’s marking may be placed on other end if insufficient space. 

MATERIAL PROPERTIES:
Stainless Steel, AISI 304, Carbide Solution Treated

DIAMETER

PROOF LOAD

YIELD STRENGTH

TENSILE STRENGTH

CORE HARDNESS

All Diameters

30,000 psi 75,000 psi

B96 Max

Elongation 30% Minimum for diameters through 4”, 18% Minimum for diameters over 4” through 7”
Reduction of Area 50% Minimum (All Diameters)
Material strengths listed are minimum acceptable per governing standard. Core hardness based on Rockwell scale.

 

STUD REFERENCE CHART:

The chart below gives the recommended stud bolt diameter, length, and quantity for a given flange size.

FLANGE NOMINAL PIPE DIAMETER (in.)
RATING BOLTING 1/2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 3-1/2 4
150# Number 4 4 4 4 4 4 4 4 8 8
Diameter 1/2 1/2 1/2 1/2 1/2 5/8 5/8 5/8 5/8 5/8
Stud Bolt Length 2-1/4 2-1/2 2-1/2 2-3/4 2-3/4 3-1/4 3-1/2 3-1/2 3-1/2 3-1/2
Mach Bolt Length 2 2 2-1/4 2-1/4 2-1/2 2-3/4 3 3 3 3
300# Number 4 4 4 4 4 8 8 8 8 8
Diameter  1/2  5/8  5/8  5/8  3/4  5/8  3/4  3/4  3/4  3/4
Stud Bolt Length 2-1/2 3 3 3-1/4 3-1/2 3-1/2 4 4-1/4 4-1/4 4-1/2
Mach Bolt Length 2-1/4 2-1/2 2-1/2 2-3/4 3 3 3-1/4 3-1/2 3-3/4 3-3/4
600# Number 4 4 4 4 4 8 8 8 8 8
Diameter  1/2  5/8  5/8  5/8  3/4  5/8  3/4  3/4  7/8  7/8
Stud Bolt Length 3 3-1/2 3-1/2 3-3/4 4-1/4 4-1/4 4-3/4 5 5-1/2 5-3/4
900# Number 4 4 4 4 4 8 8 8 8
Diameter  3/4  3/4  7/8  7/8 1  7/8 1 7/8 1-1/8
Stud Bolt Length 4-1/4 4-1/2 5 5 5-1/2 5-3/4 6-1/4 5-3/4 6-3/4
1500# Number 4 4 4 4 4 8 8 8 8
Diameter  3/4  3/4  7/8  7/8 1  7/8 1 1-1/8 1-1/4
Stud Bolt Length 4-1/4 4-1/2 5 5 5-1/2 5-3/4 6-1/4 7 7-3/4
2500# Number 4 4 4 4 4 8 8 8 8
Diameter  3/4  3/4  7/8 1 1-1/8 1 1-1/8 1-1/4 1-1/2
Stud Bolt Length 4-3/4 5 5-1/2 6 6-3/4 7 7-3/4 8-3/4 10
FLANGE NOMINAL PIPE DIAMETER (in.)
RATING BOLTING 5 6 8 10 12 14 16 18 20 24
150# Number 8 8 8 12 12 12 16 16 20 20
Diameter 3/4 3/4 3/4 7/8 7/8 1 1 1-1/8 1-1/8 1-1/4
Stud Bolt Length 3-3/4 4 4-1/4 4-1/2 4-3/4 5-1/4 5-1/4 5-3/4 6-1/4 6-3/4
Mach Bolt Length 3-1/4 3-1/4 3-1/2 4 4 4-1/2 4-1/2 5 5-1/2 6
300# Number 8 12 12 16 16 20 20 24 24 24
Diameter  3/4  3/4  7/8 1 1-1/8 1-1/8 1-1/4 1-1/4 1-1/4 1-1/2
Stud Bolt Length 4-3/4 4-3/4 5-1/2 6-1/4 6-3/4 7 7-1/2 7-3/4 8 9
Mach Bolt Length 4-1/4 4-1/4 4-3/4 5-1/2 5-3/4 6-1/4 6-1/2 6-3/4 7-1/4 8
600# Number 8 12 12 16 20 20 20 20 24 24
Diameter 1 1 1-1/8 1-1/4 1-1/4 1-3/8 1-1/2 1-5/8 1-5/8 1-7/8
Stud Bolt Length 6-1/2 6-3/4 7-1/2 8-1/2 8-3/4 9-1/4 10 10-3/4 11-1/4 13
900# Number 8 12 12 16 20 20 20 20 20 20
Diameter 1-1/4 1-1/8 1-3/8 1-3/8 1-3/8 1-1/2 1-5/8 1-7/8 2 2-1/2
Stud Bolt Length 7-1/2 7-1/2 8-3/4 9-1/4 10 10-3/4 11-1/4 12-3/4 13-3/4 17-1/4
1500# Number 8 12 12 12 16 16 16 16 16 16
Diameter 1-1/2 1-3/8 1-5/8 1-7/8 2 2-1/4 2-1/2 2-3/4 3 3-1/2
Stud Bolt Length 9-3/4 10-1/4 11-1/2 13-1/4 14-3/4 16 17-1/2 19-1/2 21-1/4 24-1/4
2500# Number 8 8 12 12 12
Diameter 1-3/4 2 2 2-1/2 2-3/4
Stud Bolt Length 11-3/4 13-1/2 15 19-1/4 21-1/4

 

 

All dimensions in inches unless otherwise noted.

Sources: ASTM Standards for Mechanical Fasteners and Related Processes 2nd Edition, Inch Fastener Standards 8th 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.