Think about what happens when a stud loses preload in a high-pressure joint. It causes leaks, downtime, and safety risks. B7 Tap End Studs are designed to hold clamping load where it matters. That's valves, pumps, and flanged connections.
One end threads directly into the tapped hole, and the other takes a single A194 Grade 2H heavy hex nut. As a B7 tap end studs supplier in Texas, Clarion stocks them locally and backs them with over 25 years of in-house manufacturing, CNC machining, and plating control. Hence, you get the bolting you need without long lead times or supply-chain guesswork.
Product overview of B7 Tap End Studs
B7 Tap End Studs are headless fasteners made from heat-treated chromium-molybdenum alloy steel to ASTM A193 Grade B7. The tap end threads into a tapped hole in a valve body, pump casing, or equipment flange, and the other end accepts an A194 Grade 2H heavy hex nut.
Like other B7 stud bolts, they provide a minimum tensile strength of 125 ksi and a minimum yield strength of 105 ksi for diameters up to 2½″. Industrial tap end studs in this grade are widely specified in refining, petrochemical, offshore, and power generation, where bolted joints see high pressure and temperature.
Key features of B7 Tap End Studs
High strength
Heat-treated Cr-Mo alloy steel to ASTM A193 Grade B7.
Direct tapped-hole engagement
The tap end threads into the equipment, so you don't need a nut on that side.
Single-nut assembly
One nut per stud means fewer loose parts and easier installation where rear access is limited.
Stays seated
The stud stays in the casing when you remove the covers, helping protect the tapped threads during maintenance.
Matched nuts
ASTM A194 Grade 2H heavy hex nuts complete the set.
Coating options
Zinc, black phosphate, PTFE, Xylan, hot-dip galvanized, or custom finishes.
Local stock and control
Houston inventory, with in-house machining and plating.
Specifications of ASTM A193 Grade B7 Tap End Studs
| Parameter | Specification |
|---|---|
| Material standard | ASTM A193 Grade B7 |
| Material | Chromium-molybdenum alloy steel, quenched and tempered |
| Nut standard | ASTM A194 Grade 2H, heavy hex |
| Tensile strength | 125 ksi min (up to 2½″ diameter) |
| Yield strength | 105 ksi min (up to 2½″ diameter) |
| Hardness | 321 HB / 35 HRC max |
| Diameter range | Multiple diameters available. Send your size for confirmation |
| Length range | Multiple lengths available. Custom lengths on request |
| Thread series | UNC up to 1″; 8UN above 1″ |
| Tap end thread, class | Per your tapped-hole requirement. Share your specification |
| Dimensional standard | ASME B18.31.2 |
| Documentation | Material test reports available on request |
Finish options for B7 Tap End Studs
Our B7 stud bolts are available with several coatings. The right choice depends on your operating environment, process media, and maintenance expectations.
| Finish | Best suited for |
|---|---|
| Plain/oiled | Dry, indoor, or controlled environments where cost is the priority |
| Zinc plating | Protection against atmospheric corrosion |
| Black phosphate | Basic corrosion resistance and oil retention |
| PTFE coating | Resistance to moisture, chemicals, and thread seizure |
| Xylan coating | Corrosion resistance and lower, more consistent installation torque |
| Hot-dip galvanized | Outdoor and infrastructure exposure. Thread fit and process requirements apply, so contact us before ordering |
| Custom finishes | Project-specific requirements |
Before you choose a finish
Every coating has a temperature limit, so contact us with your service temperature before choosing a finish. Plated and galvanized high-strength steel also needs process control to manage hydrogen embrittlement risk, and our team can walk you through the controls we use.
Applications of B7 Tap End Studs
Valve Bodies and Bonnets
B7 Tap End Studs thread directly into the valve body, and a nut secures the bonnet, creating a rigid, repeatable joint for high-pressure, high-temperature lines where valve integrity is critical.
Pumps and Compressors
Studs hold covers and flanges in place against vibration and cyclic loading. Because they stay seated in the casing, you can remove and refit covers without disturbing the stud or wearing the tapped threads.
Pressure Vessels and Heat Exchangers
B7 Tap End Studs secure nozzles, covers, and channel connections, helping the joint hold its clamping load through repeated thermal cycling and between maintenance shutdowns.
Piping Flanges and Equipment Connections
Where a flange mates to a tapped nozzle or manifold, B7 Tap End Studs paired with A194 Grade 2H nuts deliver the preload needed to keep the joint sealed, with only one nut to fit per stud.
Wellhead and Compression Equipment
The studs support assemblies under constant mechanical stress, pressure, and vibration, where a secure, high-strength joint is essential.
Petrochemical, Refining, and Power Generation
B7 Tap End Studs are a standard specification across these industries. Trusted wherever bolted joints face high pressure and temperature.
Service conditions
Standard B7 Tap End Studs are generally not suitable for sour (H₂S) service. Specify B7M for NACE MR0175 / ISO 15156 applications and L7 for low-temperature service.
Looking for a B7 Tap End Studs Supplier in Texas?
Clarion controls manufacturing from machining to plating. With more than 25 years of expertise, we supply B7 Tap End Studs and B7 stud bolts from our Houston facility, with MTRs available on request. Send us your size, length, thread, coating, and quantity, and we will confirm availability and lead time.
Contact Clarion in Houston TodayFrequently asked questions
What is the difference between B7 Tap End Studs and all-thread or double-end studs?
B7 Tap End Studs have one end made to thread into a tapped hole and a nut end that takes a single nut. All-thread and double-end studs are threaded on both ends and take a nut on each side. Choose tap end studs where one side of the joint is a tapped hole.
How much thread engagement do B7 Tap End Studs need in the tapped hole?
This depends on the tapped material and the loads involved. As a rule of thumb, steel typically needs about one stud diameter of engagement or more, while softer materials such as cast iron or aluminum need more. Always check your equipment manufacturer’s or flange specification.
How do I choose a coating for B7 Tap End Studs?
Match it to your environment and temperature. Zinc for atmospheric corrosion, PTFE or Xylan for chemical exposure and consistent torque, and galvanizing for outdoor exposure. Clarion’s team can advise on your application.
Do you provide material test reports with B7 Tap End Studs?
Yes, material test reports are available on request. Tell us when you place your quote request so documentation is ready with your order.
What are your lead times and minimums on B7 Tap End Studs?
Common sizes are stocked in Houston. Send us your diameter, length, thread, coating, and quantity, and our team will confirm availability, lead time, and any minimum order.