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ASTM A193 B7, A194 2h Bolt and Nut Fastener

China ASTM A193 B7, A194 2h Bolt and Nut Fastener, Find details about China Bolts, Hub Bolts from ASTM A193 B7, A194 2h Bolt and Nut Fastener

Model NO.
KM-310
Application
Machinery, Chemical Industry, Environmental, Building
Finish
PTFE
Dimensions
ASME B18.2.1, B18.3
Neck Type
Hex, Square, Triangular, Oval & Knurled etc
Thread
Unc, Unf, Metric Thread
Color
Black, Green, Blue, Sliver etc
Used
Building, Machinery ..
Certificate
ISO9001, SGS, CTI, RoHS
Trademark
KM
Specification
M3-M100
Origin
China
Model NO.
KM-310
Application
Machinery, Chemical Industry, Environmental, Building
Finish
PTFE
Dimensions
ASME B18.2.1, B18.3
Neck Type
Hex, Square, Triangular, Oval & Knurled etc
Thread
Unc, Unf, Metric Thread
Color
Black, Green, Blue, Sliver etc
Used
Building, Machinery ..
Certificate
ISO9001, SGS, CTI, RoHS
Trademark
KM
Specification
M3-M100
Origin
China

 

Stud Bolt Materials

The most common materials for stud bolts (for flanges) are ASTM A193 (grade B7, B8, B8M, B8T), ASTM A453 (grade 660), ASTM A320 (grade L7, L7M), and ASTM A182 (duplex and super duplex bolting). For aggressive fluids and environments, stud bolts can be coated with Xylan/PTFE, Zinc and other materials.
 

ASTM A193 Stud Bolts: Chemical Composition

Physical ElementASTM A193 grade B7 (AISI 4140)ASTM A193 grade B8 (AISI 304)ASTM A193 grade B8M (AISI 316)
Carbon0.38 - 0.48%0.08% max0.08% max
Manganese0.75 - 1.00%2.00% max2.00% max
Phosphorus, max0.035%0.045%0.045%
Sulfur, max0.040%0.030%0.030%
Silicon0.15 - 0.35%1.00% max1.00% max
Chromium0.80 - 1.10%18.0 - 20.0%16.0 - 18.0%
Nickelabsent8.0 - 11.0%10.0 - 14.0%
Molybdenum0.15 - 0.25%absent2.00 - 3.00%



ASTM A193 Stud Bolts: Mechanical Properties

ASTM A193SizeMin Tensile Strength (KSI)Min Yield Strength (KSI)Min Elongation (%)RA % minMax HBWMax HRC
ASTM A193 grade B7Up to 2-1/2125105165032135
2-5/8 - 4115951650
4-1/8 - 7100751850
ASTM A193 grade B8 Class 1All7530305022335
ASTM A193 grade B8M Class 1All7530305022396
ASTM A193 grade B8 Class 2Up to 3/4125100123532135
7/8 - 1115801535
1-1/8 - 1-1/4105652035
1-3/8 - 1-1/2100502845
ASTM A193 grade B8M Class 2Up to 3/411095154532135
7/8 - 1100802045
1-1/8 - 1-1/495652545
1-3/8 - 1-1/290503045
 

The material chosen for the threaded stud and the hex nuts should be compatible. Materials for bolting sets shall be selected based on the process's working temperatures, as shown in the table below:

 TEMPERATURE °C ( °F )
STUD BOLTS MATERIALSMIN.MAX.
CARBON STEEL-29 (-20)300 (572)
A193 B7, L7-73 (-100)400 (752)
A193 B60 (32)500 (932)
A193 B8-200 (-325)575 (1067)
A193 B160 (32)520 (968)
A193 B17B-29 (-20)650 (1202)
A913 Inconel 7180 (32)750 (1382)
A453 Gr. 660-29 (20)538 (1000)
 

ASTM A453 Stud Bolts for High-Temp. Service

ASTM A320 Stud Bolts for Low-Temp. Service

 

 Stud Bolts' Coating

Stud bolts can be coated to increase the resistance to corrosion. The most common types of coatings for stud bolts are listed below:

  • Electro zinc plating
  • Electro cadmium plating
  • Hot dip galvanizing
  • PTFE Coating
  • Phosphate coating
  • Electroless nickel plating
  • Zinc-nickel coating
  • Aluminum coating
  • Silver coating
  • Zinc/Nickel by electrodeposition
  • Xylan coating


ASTM A193 B7, A194 2h Bolt and Nut Fastener

ASTM A193 B7, A194 2h Bolt and Nut Fastener
ASTM A193 B7, A194 2h Bolt and Nut Fastener
ASTM A193 B7, A194 2h Bolt and Nut Fastener


 

 

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