Products

PTFE Coated Carbon Steel A194 2h Heavy Hex Nut Fastener

China PTFE Coated Carbon Steel A194 2h Heavy Hex Nut Fastener, Find details about China Fluoropolymer Coated Bolts, Xylan Coated B7 Studs from PTFE Coated Carbon Steel A194 2h Heavy Hex Nut Fastener

Model NO.
SBN-035
Surface Treatment
PTFE Coating
Delivery
2-4 Weeks
Manufacture Standard
ANSI B18.2.2
Length
According to Client′s Requirement
Size Range
M6-M100, 1/4"- 4"
Trademark
Qishine
Specification
1"
Origin
China
HS Code
7318159090
Model NO.
SBN-035
Surface Treatment
PTFE Coating
Delivery
2-4 Weeks
Manufacture Standard
ANSI B18.2.2
Length
According to Client′s Requirement
Size Range
M6-M100, 1/4"- 4"
Trademark
Qishine
Specification
1"
Origin
China
HS Code
7318159090

Stud Bolt and Nuts

A193 B7 Stud Bolt is a bolt with threads on both ends that designed to be screwed into a fixed part at one end, and to receive a nut on the other end. In Petroleum or Chemical industry, they are prominently used for flange connection, so stud bolt used with two nuts on either side is the most common combination which replaces bolt and nut assembly.

As we know that Stud Bolts have many categories, the type for flange connection is called flange stud bolts, which has fully thread with chambered ends. The theoretical length is measured the thread. Continuous threaded stud bolt is very similar to it, except no chambered ends.

PTFE Coated Carbon Steel A194 2h Heavy Hex Nut Fastener

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

PTFE Coated Carbon Steel A194 2h Heavy Hex Nut Fastener


 

You Might Also Like