B7 Heavy Hex Bolt, Teflon
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B7 Heavy Hex Bolt, Teflon

ASTM A193 Grade B7 heavy hex head bolts are high strength fasteners manufactured from heat treated alloy steel AISI 4140/4142, quenched and tempered. Dimensional specifications are governed by ASME B18.2.1. Grade markings consists of both the grade symbol "B7" and the manufacturer's identification mark. 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. Heavy hex head bolts have a larger head to increase the bearing surface and distribute the clamping load over a larger area. Bolts listed that are smaller than 1/2" diameter may be finished pattern bolts. A193 B7 hex bolts, as well as all thread stud bolts having diameters above 1" are most common 8UN (8 threads per inch) and are also available UNC (coarse thread). PTFE coating (commonly referred to as Teflon) 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. PTFE coatings have extreme chemical resistance and are ideal for applications including insulating piping, boiler rooms, water filled piping, water lines and more.

Governing StandardsGrade B7

ASTM A193 Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
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.

Grade B7 Head Marking
Grade B7 Material Marking

Mechanical PropertiesGrade B7

Chromium-Molybdenum, Quenched & Tempered Per ASTM A193/A193M-16
Diameter Tempering
Temperature
Tensile
Strength
Yield Strength min,
0.2% offset
Elongation
in 4D
Reduction
in Area
Hardness
Min Min ksi ksi Min % Min % Max
up to 2 1/2" 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 Chromium-Molybdenum (1) 0.38-0.48 (2) 0.75-1.00 0.035 max 0.04 max 0.15-0.35 0.80-1.10 0.15-0.25
  1. 1. Typical steel compositions used for this grade include 4140, 4142, 4145, 4140H, 4142H, and 4145H.
  2. 2. For bar sizes over 3 1/2 in. [90 mm], inclusive, the carbon content may be 0.50 % max. For the B7M grade, a minimum carbon of 0.28 % is permitted, provided that the required tensile properties are met in the section sizes involved, the use of AISI 4130 or 4130H is allowed.

Dimensional SpecificationsGrade B7

Heavy Hex Bolt dimensions
Per ASME B18.2.1-2012
Nominal
Diameter
UNC UNF E F G H J LT Y
Body Diameter Width Across Flats Width Across
Corners
Head Height Wrench
Height
Thread Length Transition
Length
Max Min Basic Max Min Max Min Basic Max Min Min Lengths
up to 6"
Lengths
> 6"
Max
1/4 0.2500 20 28 0.2500 0.2405 7/16 0.4380 0.4280 0.5050 0.4880 5/32 0.1630 0.1500 0.1060 0.7500 1.0000 0.2500
5/16 0.3125 18 24 0.3125 0.3065 1/2 0.5000 0.4890 0.5770 0.5570 13/64 0.2110 0.1950 0.1400 0.8750 1.1250 0.2750
3/8 0.3750 16 24 0.3750 0.3690 9/16 0.5620 0.5510 0.6500 0.6280 15/64 0.2430 0.2260 0.1600 1.0000 1.2500 0.3120
7/16 0.4375 14 20 0.4375 0.4305 5/8 0.6250 0.6120 0.7220 0.6980 9/32 0.2910 0.2720 0.1950 1.1250 1.3750 0.3570
1/2 0.5000 13 20 0.5000 0.4930 3/4 0.7500 0.7360 0.8660 0.8400 5/16 0.3230 0.3020 0.2150 1.2500 1.5000 0.3850
9/16 0.5625 12 18 0.5625 0.5545 13/16 0.8120 0.7980 0.9380 0.9100 23/64 0.3710 0.3480 0.2500 1.3750 1.6250 0.4170
5/8 0.6250 11 18 0.6250 0.6170 15/16 0.9380 0.9220 1.0830 1.0510 25/64 0.4030 0.3780 0.2690 1.5000 1.7500 0.4550
3/4 0.7500 10 16 0.7500 0.7410 1 1/8 1.1250 1.1000 1.2990 1.2540 15/32 0.4830 0.4550 0.3240 1.7500 2.0000 0.5000
7/8 0.8750 9 14 0.8750 0.8660 1 5/16 1.3120 1.2850 1.5160 1.4650 35/64 0.5630 0.5310 0.3780 2.0000 2.2500 0.5560
1 1.0000 8 14 1.0000 0.9900 1 1/2 1.5000 1.4690 1.7320 1.6750 39/64 0.6270 0.5910 0.4160 2.2500 2.5000 0.6250
1 1/8 1.1250 7 12 1.1250 1.1140 1 11/16 1.6880 1.6310 1.9490 1.8590 11/16 0.7180 0.6580 0.4610 2.5000 2.7500 0.7140
1 1/4 1.2500 7 12 1.2500 1.2390 1 7/8 1.8750 1.8120 2.1650 2.0660 25/32 0.8130 0.7490 0.5300 2.7500 3.0000 0.7140
1 3/8 1.3750 6 12 1.3750 1.3630 2 1/16 2.0620 1.9940 2.3820 2.2730 27/32 0.8780 0.8100 0.5690 3.0000 3.2500 0.8330
1 1/2 1.5000 6 12 1.5000 1.4880 2 1/4 2.2500 2.1750 2.5980 2.4800 15/16 0.9740 0.9020 0.6400 3.2500 3.5000 0.8330
  1. All dimensions are in inches.
  2. Usable thread length for Hex Head Cap Screws under 6 1/4" long can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″
B7 Heavy Hex Bolt, Teflon
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Diameter Thread Pitch Length Threading Item # Availability Price Quantity UOM
3/8 16 1 Full HHB70370100T-I In Stock $1.81165/EA EA
3/8 16 1 1/4 Full HHB70370125T-I In Stock $1.87357/EA EA
3/8 16 1 1/2 Partial HHB70370150T-I In Stock $1.96669/EA EA
3/8 16 2 Partial HHB70370200T-I In Stock $2.69256/EA EA
1/2 13 1 Full HHB70500100T-I In Stock $1.81165/EA EA
1/2 13 1 1/4 Full HHB70500125T-I In Stock $1.87357/EA EA
1/2 13 1 1/2 Full HHB70500150T-I In Stock $1.98852/EA EA
1/2 13 1 3/4 Full HHB70500175T-I In Stock $2.34/EA EA
1/2 13 2 Partial HHB70500200T-I In Stock $2.40156/EA EA
1/2 13 2 1/4 Partial HHB70500225T-I In Stock $2.58001/EA EA
1/2 13 2 1/2 Partial HHB70500250T-I In Stock $2.90639/EA EA
1/2 13 2 3/4 Partial HHB70500275T-I In Stock $2.96215/EA EA
1/2 13 3 Partial HHB70500300T-I In Stock $3.83515/EA EA
1/2 13 3 1/2 Partial HHB70500350T-I In Stock $3.75274/EA EA
1/2 13 4 Partial HHB70500400T-I In Stock $3.84679/EA EA
1/2 13 4 1/2 Partial HHB70500450T-I In Stock $3.94224/EA EA
5/8 11 1 Full HHB70620100T-I In Stock $2.35081/EA EA
5/8 11 1 1/4 Full HHB70620125T-I In Stock $2.48537/EA EA
5/8 11 1 1/2 Full HHB70620150T-I In Stock $2.78801/EA EA
5/8 11 1 3/4 Full HHB70620175T-I In Stock $3.6247/EA EA
5/8 11 2 Full HHB70620200T-I In Stock $3.72/EA EA
5/8 11 2 1/4 Partial HHB70620225T-I In Stock $3.77648/EA EA
5/8 11 2 1/2 Partial HHB70620250T-I In Stock $3.77648/EA EA
5/8 11 2 3/4 Partial HHB70620275T-I In Stock $4.2756/EA EA
5/8 11 3 Partial HHB70620300T-I In Stock $4.392/EA EA
5/8 11 3 1/4 Partial HHB70620325T-I In Stock $4.14198/EA EA
5/8 11 3 1/2 Partial HHB70620350T-I In Stock $4.76472/EA EA
5/8 11 3 3/4 Partial HHB70620375T-I In Stock $4.86/EA EA
5/8 11 4 Partial HHB70620400T-I In Stock $5.12765/EA EA
5/8 11 4 1/2 Partial HHB70620450T-I In Stock $6.11379/EA EA
5/8 11 5 Partial HHB70620500T-I In Stock $6.1408/EA EA
5/8 11 5 1/2 Partial HHB70620550T-I In Stock $7.53446/EA EA
3/4 10 1 1/2 Full HHB70750150T-I In Stock $3.7262/EA EA
3/4 10 1 3/4 Full HHB70750175T-I In Stock $4.43368/EA EA
3/4 10 2 Full HHB70750200T-I In Stock $4.8469/EA EA
3/4 10 2 1/4 Full HHB70750225T-I In Stock $5.26361/EA EA
3/4 10 2 1/2 Full HHB70750250T-I In Stock $5.38001/EA EA
3/4 10 2 3/4 Partial HHB70750275T-I In Stock $6.216/EA EA
3/4 10 3 Partial HHB70750300T-I In Stock $6.27908/EA EA
3/4 10 3 1/4 Partial HHB70750325T-I In Stock $6.34613/EA EA
3/4 10 3 1/2 Partial HHB70750350T-I In Stock $7.33553/EA EA
3/4 10 3 3/4 Partial HHB70750375T-I In Stock $7.80346/EA EA
3/4 10 4 Partial HHB70750400T-I In Stock $7.98/EA EA
3/4 10 4 1/2 Partial HHB70750450T-I In Stock $8.35892/EA EA
3/4 10 5 Partial HHB70750500T-I In Stock $8.1182/EA EA
3/4 10 5 1/2 Partial HHB70750550T-I In Stock $9.28965/EA EA
3/4 10 6 Partial HHB70750600T-I In Stock $9.82602/EA EA
7/8 9 2 Full HHB70870200T-I In Stock $5.78741/EA EA
7/8 9 2 1/4 Full HHB70870225T-I In Stock $6.50723/EA EA
7/8 9 2 1/2 Full HHB70870250T-I In Stock $6.90124/EA EA
7/8 9 2 3/4 Full HHB70870275T-I In Stock $7.668/EA EA
7/8 9 3 Partial HHB70870300T-I In Stock $8.10377/EA EA
7/8 9 3 1/2 Partial HHB70870350T-I In Stock $9.07024/EA EA
7/8 9 3 3/4 Partial HHB70870375T-I In Stock $9.34785/EA EA
7/8 9 4 Partial HHB70870400T-I In Stock $9.75525/EA EA
7/8 9 4 1/4 Partial HHB70870425T-I In Stock $10.32/EA EA
7/8 9 4 1/2 Partial HHB70870450T-I In Stock $11.0445/EA EA
7/8 9 4 3/4 Partial HHB70870475T-I In Stock $11.33783/EA EA
7/8 9 5 Partial HHB70870500T-I In Stock $12.24/EA EA
7/8 9 5 1/2 Partial HHB70870550T-I In Stock $13.12881/EA EA
1 8 2 Full HHB71000200T-I In Stock $7.93196/EA EA
1 8 2 1/4 Full HHB71000225T-I In Stock $9.04428/EA EA
1 8 2 1/2 Full HHB71000250T-I 7-10 Working Days $9.56808/EA EA
1 8 2 3/4 Full HHB71000275T-I In Stock $9.64164/EA EA
1 8 3 Full HHB71000300T-I In Stock $11.15484/EA EA
1 8 3 1/4 Partial HHB71000325T-I In Stock $11.22003/EA EA
1 8 3 1/2 Partial HHB71000350T-I In Stock $11.91843/EA EA
1 8 3 3/4 Partial HHB71000375T-I In Stock $12.06/EA EA
1 8 4 Partial HHB71000400T-I In Stock $12.3/EA EA
1 8 4 1/2 Partial HHB71000450T-I In Stock $13.07556/EA EA
1 8 5 Partial HHB71000500T-I In Stock $13.6756/EA EA
1 8 5 1/2 Partial HHB71000550T-I In Stock $14.2008/EA EA
1 8 6 Partial HHB71000600T-I In Stock $14.64/EA EA
1 1/8 7 3 Full HHB71120300CT-I In Stock $18.42254/EA EA
1 1/8 7 3 1/2 Full HHB71120350CT-I In Stock $20.42303/EA EA
1 1/8 7 4 Partial HHB71120400CT-I 7-10 Working Days $22.49287/EA EA
1 1/8 7 4 1/2 Partial HHB71120450CT-I In Stock $24.51779/EA EA
1 1/8 7 5 Partial HHB71120500CT-I In Stock $26.61584/EA EA
1 1/8 7 5 1/2 Partial HHB71120550CT-I In Stock $28.66545/EA EA
1 1/8 7 6 Partial HHB71120600CT-I In Stock $30.66407/EA EA
1 1/8 8 3 Full HHB71120300T-I In Stock $17.31497/EA EA
1 1/8 8 3 1/2 Full HHB71120350T-I In Stock $19.19651/EA EA
1 1/8 8 4 Partial HHB71120400T-I In Stock $21.14261/EA EA
1 1/8 8 4 1/2 Partial HHB71120450T-I In Stock $23.04691/EA EA
1 1/8 8 5 Partial HHB71120500T-I In Stock $25.01925/EA EA
1 1/8 8 5 1/2 Partial HHB71120550T-I In Stock $26.94648/EA EA
1 1/8 8 6 Partial HHB71120600T-I In Stock $28.82646/EA EA
1 1/4 7 3 Full HHB71250300CT-I In Stock $24.72763/EA EA
1 1/4 7 3 1/2 Full HHB71250350CT-I In Stock $26.88188/EA EA
1 1/4 7 4 Partial HHB71250400CT-I In Stock $29.62608/EA EA
1 1/4 7 4 1/2 Partial HHB71250450CT-I In Stock $32.14735/EA EA
1 1/4 7 5 Partial HHB71250500CT-I In Stock $34.72679/EA EA
1 1/4 7 5 1/2 Partial HHB71250550CT-I In Stock $36.91382/EA EA
1 1/4 7 6 Partial HHB71250600CT-I In Stock $38.84138/EA EA
1 1/4 8 3 Full HHB71250300T-I 7-10 Working Days $23.22145/EA EA
1 1/4 8 3 1/2 Full HHB71250350T-I In Stock $25.25019/EA EA
1 1/4 8 4 Partial HHB71250400T-I In Stock $27.82769/EA EA
1 1/4 8 4 1/2 Partial HHB71250450T-I In Stock $30.19992/EA EA
1 1/4 8 5 Partial HHB71250500T-I 7-10 Working Days $32.6264/EA EA
1 1/4 8 5 1/2 Partial HHB71250550T-I In Stock $34.68767/EA EA
1 1/4 8 6 Partial HHB71250600T-I In Stock $36.50758/EA EA