Unc B7 Bolt 2h Nut for B16.5 Flange Fastener

• Customization: Available
• Material: Carbon Steel
• Type: Round Head
• Model NO.: SBN-003
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, ANSI, GB, JIS, BSW, ASME, ISO, Hg
• Grade: 8.8
• Application: Machinery, Chemical Industry, Environmental, Building, B16.5 Flanges Connection
• Finish: Black
• Surface Treatment: Black
• Delivery: 2-4 Weeks
• Thread: Full Thread, Unc, Unf
• Length: According to Client's Requirement
• Size Range: M6-M100, 1/4"- 4"
• Transport Package: Plywood Cases/Wooden Boxes
• Specification: 1" x 80mm
• Trademark: Qishine
• Origin: China
• HS Code: 7318159090
• Package Size: 20.00cm * 12.00cm * 12.00cm
• Package Gross Weight: 12.000kg

Product Description

Company Profile

                                                                 About Us
Xiamen Qishine Industry Co., Ltd. is a Chinese company established in 2013. We are a leading fabrication services provider in industries such as Oil & Gas, Petroleum, Marine, Oilfield, Mining, and Heavy Industry, specifically for pipeline construction and maintenance.

Qishine is ideal choice for EPC companies and project contractors. Our company specializes in supplying a range of products including Fasteners, Flanges, Gaskets, Fittings, Valves, Pipes and Piping Spare Parts. Our products are API, CE, TUV and ISO certified.   Products are widely used on oil rigs, new nuclear power plant, Chemical and Heavy Industry.

Qishine is proud as being a premium product supplier who works closely with our clients to achieve the best possible results. We have an experienced team, skilled labor force, and advanced facilities to ensure safe and efficient project completion, meeting deadlines and budget requirements.

Stud Bolt and Nuts
A193 B7 Stud Bolts are commonly used in the Petroleum or Chemical industry for flange connections. They are designed to be screwed into a fixed part at one end and receive a nut on the other end. Using stud bolts with two nuts on either side is a common practice as it replaces the traditional bolt and nut assembly. This combination provides more secure and efficient fastening for flanges.

That's correct! A193 B7 stud bolts are known for their high strength and durability, making them suitable for demanding environments such as the Petroleum or Chemical industry. The use of stud bolts with two nuts on each side offers several advantages over the traditional bolt and nut assembly.

Firstly, using stud bolts allows for easier installation and removal since one end is screwed into a fixed part, while the other end receives a nut. This eliminates the need to hold the bolt while tightening the nut, making the process more efficient.

Secondly, the double nut arrangement provides a more secure fastening for flange connections. By tightening one nut against the other, it creates a locking effect that helps prevent loosening due to vibrations or thermal expansion and contraction.

Another advantage is that the use of stud bolts with two nuts allows for more even distribution of the load. With a traditional bolt and nut assembly, the load may be concentrated on the thread engagement between the bolt and nut. However, using two nuts on each side of the stud bolt spreads the load more evenly along the entire length of the bolt, reducing the risk of failure.

Overall, using A193 B7 stud bolts with two nuts on either side is a common practice in industrial applications due to the increased security, efficiency, and load distribution they provide for flange connections.

Certifications

 

As we know, stud bolts come in many different categories. The type used for flange connections is called a flange stud bolt and has a fully threaded chambered end. The theoretical length is measured by the thread. A continuous threaded stud bolt is very similar, except it has no chambered ends.

In the context of flange connections, the type of stud bolt used is commonly referred to as a flange stud bolt. These bolts are fully threaded with chambered ends, meaning that the threads run along their entire length and their ends are slightly modified to accommodate a nut.

The theoretical length of a flange stud bolt is measured from the top of the head to the tip of the chamfered end (the threaded portion). This determines how far the bolt engages with the nut and flange.

Continuous threaded stud bolts are very similar to flange stud bolts, but they lack chamfered ends. They have uninterrupted threading along their entire length without any modification at the ends. They are typically used in applications where bolt protrusion from the nut is not a concern, such as securing equipment or structures.

It is important to select the appropriate type of stud bolt for the application in question, taking into account factors such as intended use, load capacity and the necessary thread engagement for a secure and reliable connection.

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 Element	ASTM A193 grade B7 (AISI 4140)	ASTM A193 grade B8 (AISI 304)	ASTM A193 grade B8M (AISI 316)
Carbon	0.38 - 0.48%	0.08% max	0.08% max
Manganese	0.75 - 1.00%	2.00% max	2.00% max
Phosphorus, max	0.035%	0.045%	0.045%
Sulfur, max	0.040%	0.030%	0.030%
Silicon	0.15 - 0.35%	1.00% max	1.00% max
Chromium	0.80 - 1.10%	18.0 - 20.0%	16.0 - 18.0%
Nickel	absent	8.0 - 11.0%	10.0 - 14.0%
Molybdenum	0.15 - 0.25%	absent	2.00 - 3.00%

ASTM A193 Stud Bolts: Mechanical Properties

ASTM A193	Size	Min Tensile Strength (KSI)	Min Yield Strength (KSI)	Min Elongation (%)	RA % min	Max HBW	Max HRC
ASTM A193 grade B7	Up to 2-1/2	125	105	16	50	321	35
	2-5/8 - 4	115	95	16	50
	4-1/8 - 7	100	75	18	50
ASTM A193 grade B8 Class 1	All	75	30	30	50	223	35
ASTM A193 grade B8M Class 1	All	75	30	30	50	223	96
ASTM A193 grade B8 Class 2	Up to 3/4	125	100	12	35	321	35
	7/8 - 1	115	80	15	35
	1-1/8 - 1-1/4	105	65	20	35
	1-3/8 - 1-1/2	100	50	28	45
ASTM A193 grade B8M Class 2	Up to 3/4	110	95	15	45	321	35
	7/8 - 1	100	80	20	45
	1-1/8 - 1-1/4	95	65	25	45
	1-3/8 - 1-1/2	90	50	30	45

 

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 MATERIALS	MIN.	MAX.
CARBON STEEL	-29 (-20)	300 (572)
A193 B7, L7	-73 (-100)	400 (752)
A193 B6	0 (32)	500 (932)
A193 B8	-200 (-325)	575 (1067)
A193 B16	0 (32)	520 (968)
A193 B17B	-29 (-20)	650 (1202)
A913 Inconel 718	0 (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

Products to our clients.

 

 

Our Superiority

Why choose Qishine?

High Quality: Qishine provide high quality products.
Reasonable and Competitive Price: Our products are sales well in oversea markets,especially in Europe, South America and Africa.
Professional Service: Qishine's sales team have rich experience in exporting and projects service.
Fast Delivery: Fast deliver the goods to all of the world.
One Stop Service: We provide gaskets,screws,flanges,pipes and fittings.Best choice for EPC companies and projects' construction.

Who choose Qishine?

Application:

FAQ

About Sample

 1.We can offer samples for testing,courier freight afforded by the receiver .

 2.For cost saving, freight prepaid is recommended.

 3.Special requirement accepted
 

About Order
 

1.Payment Term: T/T, L/C

2.Trade Term:  EXW, FCA, FOB, CFR,CIF,DDU

3.Documents: CI, PL, CO,MTC and BL.
 

About After Sale Service

Product Quality Guarantee: We guarantee our products quality for 12months from the date of BL.