B7 Stud Bolt, Plated
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B7 Stud Bolt, Plated

ASTM A193 Grade B7 stud bolts are high strength fasteners manufactured from a chromium-molybdenum steel and are quenched and tempered. Dimensional specifications are governed by ASME B18.31.2. Grade markings consists of both the grade symbol "B7" and the manufacturer's identification mark on one end of each stud 3/8" diameter and larger. Manufacturer's marking may be placed on other end if insufficient space. Inch series fasteners meeting ASTM A193 Grade B7 specifications are typically used in flange bolting applications. ASTM A193 covers the requirements for high temperature and high pressure bolting. A193 B7 all thread studs having diameters above 1" are most common 8UN (8 threads per inch). These fasteners are available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

 

Governing StandardsGrade B7

ASTM A193 Covers alloy and stainless steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
ASME B18.31.2 Covers the complete dimensional and general data for continuous thread, flange studs (stud bolts), and double-end inch-dimensioned studs.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Grade B7 Head Marking
Grade B7 Material Marking

Mechanical PropertiesGrade B7

Alloy Steel, Quenched & Tempered Per ASTM A193/A193M-16
Diameter Tempering
Temperature
Tensile
Strength
Yield Strength,
0.2% offset
Elongation
in 4D
Reduction
of Area
Hardness
Min ksi Min ksi Min % Min % Max
2 1/2" and under 1100F 125 105 16 50 321 HBW or 35 HRC
over 2 1/2 to 4" 1100F 115 95 16 50 321 HBW or 35 HRC
over 4 to 7" 1100F 100 75 18 50 321 HBW or 35 HRC

Chemical PropertiesGrade B7

Per ASTM A193/A193M-16
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Chromium Molybdenum
% by weight % by weight % by weight % by weight % by weight % by weight % by weight
B7 Alloy Steel 0.38-0.48 (1) 0.75-1.00 0.035 max 0.040 max 0.15-0.35 0.80-1.10 0.15-0.25
  1. 1. For bar sizes over 3 1⁄2 in. [90 mm], inclusive, the carbon content may be 0.50 % max.

Stud Flange ChartsASME B16.5

FLANGE NOMINAL PIPE DIAMETER
CLASS 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
CLASS 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 - - - - -
  1. All dimensions are in inches.
B7 Stud Bolt, Plated
View
Diameter Thread Pitch Length 1st Thrd To 1st Thrd Item # Availability Price Quantity UOM
1/2 13 2 1/2 2 1/4 SB7P0500250Y-I In Stock $0.36528/EA EA
1/2 13 3 2 3/4 SB7P0500300Y-I In Stock $0.68861/EA EA
1/2 13 3 1/2 3 1/4 SB7P0500350Y-I In Stock $1.65581/EA EA
1/2 13 4 3 3/4 SB7P0500400Y-I In Stock $0.57872/EA EA
1/2 13 4 1/2 4 1/4 SB7P0500450Y-I In Stock $0.5657/EA EA
5/8 11 3 2 3/4 SB7P0620300Y-I In Stock $1.43338/EA EA
5/8 11 3 1/2 3 1/4 SB7P0620350Y-I In Stock $1.65337/EA EA
5/8 11 4 3 3/4 SB7P0620400Y-I In Stock $0.76072/EA EA
5/8 11 4 1/2 4 1/4 SB7P0620450Y-I In Stock $1.00634/EA EA
5/8 11 5 4 3/4 SB7P0620500Y-I In Stock $1.08396/EA EA
5/8 11 5 1/2 5 1/4 SB7P0620550Y-I 7-10 Working Days $1.07736/EA EA
5/8 11 6 5 3/4 SB7P0620600Y-I In Stock $1.0965/EA EA
5/8 11 6 1/2 6 1/4 SB7P0620650Y-I In Stock $1.70558/EA EA
3/4 10 3 1/2 3 1/4 SB7P0750350Y-I In Stock $1.04993/EA EA
3/4 10 4 3 3/4 SB7P0750400Y-I In Stock $1.38234/EA EA
3/4 10 4 1/2 4 1/4 SB7P0750450Y-I In Stock $3.16581/EA EA
3/4 10 5 4 3/4 SB7P0750500Y-I 7-10 Working Days $1.61134/EA EA
3/4 10 5 1/2 5 1/4 SB7P0750550Y-I In Stock $1.85844/EA EA
3/4 10 6 5 3/4 SB7P0750600Y-I In Stock $1.87225/EA EA
3/4 10 6 1/2 6 1/4 SB7P0750650Y-I 7-10 Working Days $2.02192/EA EA
3/4 10 7 6 3/4 SB7P0750700Y-I In Stock $2.5045/EA EA
7/8 9 4 3 3/4 SB7P0870400Y-I In Stock $2.08905/EA EA
7/8 9 4 1/2 4 1/4 SB7P0870450Y-I In Stock $2.08518/EA EA
7/8 9 5 4 3/4 SB7P0870500Y-I 7-10 Working Days $0.74228/EA EA
7/8 9 5 1/2 5 1/4 SB7P0870550Y-I In Stock $2.37478/EA EA
7/8 9 6 5 3/4 SB7P0870600Y-I In Stock $2.95067/EA EA
7/8 9 6 1/2 6 1/4 SB7P0870650Y-I In Stock $2.94857/EA EA
7/8 9 7 6 3/4 SB7P0870700Y-I In Stock $2.41058/EA EA
1 8 5 4 3/4 SB7P1000500Y-I In Stock $2.84214/EA EA
1 8 5 1/2 5 1/4 SB7P1000550Y-I In Stock $3.37658/EA EA
1 8 6 5 3/4 SB7P1000600Y-I In Stock $3.95318/EA EA
1 8 6 1/2 6 1/4 SB7P1000650Y-I 7-10 Working Days $6.6124/EA EA
1 8 7 6 3/4 SB7P1000700Y-I 7-10 Working Days $6.99631/EA EA
1 8 7 1/2 7 1/4 SB7P1000750Y-I In Stock $4.35198/EA EA
1 1/8 8 6 5 3/4 SB7P1120600Y-I In Stock $4.42312/EA EA
1 1/8 8 6 1/2 6 1/4 SB7P1120650Y-I 7-10 Working Days $5.04249/EA EA
1 1/8 8 7 6 3/4 SB7P1120700Y-I In Stock $5.5891/EA EA
1 1/8 8 7 1/2 7 1/4 SB7P1120750Y-I 7-10 Working Days $4.83672/EA EA
1 1/8 8 8 7 3/4 SB7P1120800Y-I 7-10 Working Days $4.89195/EA EA
1 1/8 8 8 1/2 8 1/4 SB7P1120850Y-I In Stock $6.42923/EA EA
1 1/8 8 9 8 3/4 SB7P1120900Y-I In Stock $7.07169/EA EA
1 1/8 8 10 9 3/4 SB7P1121000Y-I 7-10 Working Days $14.17895/EA EA
1 1/4 8 6 1/2 6 1/4 SB7P1250650Y-I In Stock $6.29034/EA EA
1 1/4 8 7 6 3/4 SB7P1250700Y-I 7-10 Working Days $6.77109/EA EA
1 1/4 8 7 1/2 7 1/4 SB7P1250750Y-I 7-10 Working Days $6.57303/EA EA
1 1/4 8 8 7 3/4 SB7P1250800Y-I 7-10 Working Days $7.3624/EA EA
1 1/4 8 8 1/2 8 1/4 SB7P1250850Y-I In Stock $7.43838/EA EA
1 1/4 8 9 8 3/4 SB7P1250900Y-I In Stock $8.2757/EA EA
1 1/4 8 9 1/2 9 1/4 SB7P1250950Y-I 7-10 Working Days $8.40058/EA EA
1 1/4 8 10 9 3/4 SB7P1251000Y-I In Stock $8.09993/EA EA