B7 Thread Rod

ASTM A193 Grade B7 T Eflon Industry Thread Rod

ASTM A193 Grade B7 PTFE Coated Threaded Rod – A fully threaded stud bolt manufactured from heat-treated chromium-molybdenum alloy steel (AISI 4140/4142) per ASTM A193 Grade B7, with a PTFE (polytetrafluoroethylene) coating such as Teflon or Xylan. Minimum tensile strength of 125 ksi (860 MPa) and yield strength of 105 ksi (720 MPa). Maximum hardness 35 HRC. PTFE coating provides chemical resistance, corrosion protection, high-temperature stability (intermittent service up to 315°C / 600°F), and enhanced lubricity for consistent torque application and anti-galling during disassembly. Typically paired with ASTM A194 Grade 2H heavy hex nuts. Applications: bolting for pressure vessels, valves, flanges, and fittings in high-temperature or high-pressure service, including oil and gas, chemical processing, marine environments, boiler rooms, and piping systems. Available in common blue, red, or green PTFE finish options.

ASTM A193 Grade B7 PTFE Coated Threaded Rod – A fully threaded stud bolt manufactured from heat-treated chromium-molybdenum alloy steel (AISI 4140/4142) per ASTM A193 Grade B7, with a PTFE (polytetrafluoroethylene) coating such as Teflon or Xylan. Minimum tensile strength of 125 ksi (860 MPa) and yield strength of 105 ksi (720 MPa). Maximum hardness 35 HRC. PTFE coating provides chemical resistance, corrosion protection, high-temperature stability (intermittent service up to 315°C / 600°F), and enhanced lubricity for consistent torque application and anti-galling during disassembly. Typically paired with ASTM A194 Grade 2H heavy hex nuts. Applications: bolting for pressure vessels, valves, flanges, and fittings in high-temperature or high-pressure service, including oil and gas, chemical processing, marine environments, boiler rooms, and piping systems. Available in common blue, red, or green PTFE finish options.

Product Details

Product Introduction
Continuously threaded studs manufactured to ASTM A193 Grade B7 — a chromium-molybdenum (AISI 4140/4142) alloy steel specification — and finished with a polytetrafluoroethylene (PTFE) fluoropolymer coating. The studs are designed for bolted connections in ASME pressure classes 150 through 2500, service temperatures up to 450 °C, and corrosive industrial atmospheres. Standard supply includes PTFE-coated stud with two ASTM A194 Grade 2H heavy hex nuts. Blue PTFE topcoat (e.g., Xylan 1070/1424) is the default colour.

Material & Mechanical Properties
Quenched and tempered to the requirements of ASTM A193 B7:

  • Diameters ≤ 2½″ (64 mm): tensile strength min 125 ksi (862 MPa), yield strength min 105 ksi (724 MPa), elongation min 16 %, reduction of area min 50 %, hardness max 321 HBW.

  • Diameters 2½″–4″: tensile strength min 115 ksi (793 MPa), yield strength min 95 ksi (655 MPa), elongation min 16 %.
    Maximum continuous service temperature for the base metal is 450 °C. For applications below –29 °C, specify ASTM A320 L7. Heat-number traceability and grade symbol “B7” are stamped on one end of every stud ⅜″ and larger.

PTFE Coating Properties
The PTFE coating system delivers a dry-film thickness of 5–76 µm, providing an exceptionally low coefficient of friction of 0.09 (K‑factor approximately 0.14 per ASTM D5648). This prevents thread galling, reduces installation torque, and enables clean disassembly after extended service. In neutral salt spray (ASTM B‑117), the coating resists red rust for over 3900 hours. Service temperature of the coating ranges from –50 °C to +210 °C (260 °C for select formulations). The fluoropolymer layer is inert to virtually all industrial chemicals, acids, and alkalis, and its non‑stick surface prevents product build‑up.

Geometry, Thread & Nut Pairing
Continuous full‑length threading in UN/UNC pitch per ASME B1.1, Class 2A fit. For diameters above 1″ in ASME B16.5 flanges, the standard thread is 8UN. Metric threads M6–M125 are also produced. Dimensional conformity to ASME B18.31.2 (continuous thread studs). The stud must be assembled with ASTM A194 Grade 2H heavy hex nuts (quenched and tempered, hardness 248–352 HB). Substituting a lower‑grade nut compromises joint capacity.

Application Suitability
Refinery piping, petrochemical plants, offshore platforms, power generation, and pressure systems where high‑temperature strength, corrosion resistance, and reliable preload through controlled friction are essential. The PTFE coating also suits food and pharmaceutical environments where metal release must be prevented and equipment cleaned without disassembly.

Technical Parameters

Place of Origin CHINA
Standard ASTM A193 Grade B7 T Eflon Industry Thread Rod
HS CODE 7318159001
Brand Name QBH
Certification ISO9001
Material 35K, 40Cr, 35CrMo, SCM435，etc.
Size M3-M64
Production Process Cold forging≤300mm, Hot forging≤1000mm
Class 4.8/ 6.8/ 8.8/ 10.9/ 12.9
Delivery Time Within 30 Days

 

Product Introduction
Continuously threaded studs manufactured to ASTM A193 Grade B7 — a chromium-molybdenum (AISI 4140/4142) alloy steel specification — and finished with a polytetrafluoroethylene (PTFE) fluoropolymer coating. The studs are designed for bolted connections in ASME pressure classes 150 through 2500, service temperatures up to 450 °C, and corrosive industrial atmospheres. Standard supply includes PTFE-coated stud with two ASTM A194 Grade 2H heavy hex nuts. Blue PTFE topcoat (e.g., Xylan 1070/1424) is the default colour.

Material & Mechanical Properties
Quenched and tempered to the requirements of ASTM A193 B7:

  • Diameters ≤ 2½″ (64 mm): tensile strength min 125 ksi (862 MPa), yield strength min 105 ksi (724 MPa), elongation min 16 %, reduction of area min 50 %, hardness max 321 HBW.

  • Diameters 2½″–4″: tensile strength min 115 ksi (793 MPa), yield strength min 95 ksi (655 MPa), elongation min 16 %.
    Maximum continuous service temperature for the base metal is 450 °C. For applications below –29 °C, specify ASTM A320 L7. Heat-number traceability and grade symbol “B7” are stamped on one end of every stud ⅜″ and larger.

PTFE Coating Properties
The PTFE coating system delivers a dry-film thickness of 5–76 µm, providing an exceptionally low coefficient of friction of 0.09 (K‑factor approximately 0.14 per ASTM D5648). This prevents thread galling, reduces installation torque, and enables clean disassembly after extended service. In neutral salt spray (ASTM B‑117), the coating resists red rust for over 3900 hours. Service temperature of the coating ranges from –50 °C to +210 °C (260 °C for select formulations). The fluoropolymer layer is inert to virtually all industrial chemicals, acids, and alkalis, and its non‑stick surface prevents product build‑up.

Geometry, Thread & Nut Pairing
Continuous full‑length threading in UN/UNC pitch per ASME B1.1, Class 2A fit. For diameters above 1″ in ASME B16.5 flanges, the standard thread is 8UN. Metric threads M6–M125 are also produced. Dimensional conformity to ASME B18.31.2 (continuous thread studs). The stud must be assembled with ASTM A194 Grade 2H heavy hex nuts (quenched and tempered, hardness 248–352 HB). Substituting a lower‑grade nut compromises joint capacity.

Application Suitability
Refinery piping, petrochemical plants, offshore platforms, power generation, and pressure systems where high‑temperature strength, corrosion resistance, and reliable preload through controlled friction are essential. The PTFE coating also suits food and pharmaceutical environments where metal release must be prevented and equipment cleaned without disassembly.

Technical Parameters

Place of Origin CHINA
Standard ASTM A193 Grade B7 T Eflon Industry Thread Rod
HS CODE 7318159001
Brand Name QBH
Certification ISO9001
Material 35K, 40Cr, 35CrMo, SCM435，etc.
Size M3-M64
Production Process Cold forging≤300mm, Hot forging≤1000mm
Class 4.8/ 6.8/ 8.8/ 10.9/ 12.9
Delivery Time Within 30 Days

 

FAQ

1. How do you let me trust you.

Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.

 

2. How about your price.

We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.

 

3. How do you control your quality.

Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods

 

4. Could you provide free samples?

For new customer, We can provide free samples for standard fastener, But the clients will pay the express

charges. For old customer, We will send you free samples and pay express charges by ourself.

 

5. What is your packing.

Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information

such as LOGO and pattern of customers.

 

6. What is your payment term

Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately.

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