Prefabricated High Strength Bolts Screws & A194 Nut A193 B7 Hexagon Head Bolt for Flange Valve Fastener M12 M18 M 30 M22 Stubs

• Customization: Available
• After-sales Service: High Quality
• Warranty: 30 Years
• Model NO.: as customer require
• Product Name: Bolts and Nuts and Washer
• Head Style: Hexagonal
• Application: Vessel and Flanges Connector
• Key Words: Fastene
• Exterl Surface: Black, Varnish Painting, Galvanized
• Material: Carbon Steel, Stainless Steel, Alloy Steel
• Package: Wrapped by Plastic Clothes,Plywood Cases/Wooden Bo
• Accessories: Normal Head, Bit, Expanding Head, Hex-Nut, Seal
• Length: Length 1.5m, 2m, 3m, 4m, 5m, 6m or as Per Requeste
• MOQ: 100PCS
• Manufacturing Process: Cold Drawn
• Thread Form: ISO, API, DIN , En, GB. JIS
• Standard: DIN, ANSI, GB, JIS, Bsw, ASME, ISO, Hg
• Grade: 8.8, 10.8 , 12.8.
• Surface Treatment: Blue Xylan Coated/PTFE Coating
• Transport Package: Export Packing
• Specification: M10 M2 M22M30M50
• Trademark: Shanghai ali-steel
• Origin: China
• HS Code: 7201100000
• Production Capacity: 5000 Pieces/Year

Product Description

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.



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

 

 

 

 

 

Company Profile
Shanghai Ali-mama Steel Trading Co.Ltd Known as Ali-Steel, pioneered in 2020, based in SHANGHAI, ALI-STEEL is a professional one-stop steel products supplier. Our business philosophy is"keep improving & win-win cooperation". We furnish best steel and strict quality management, perfect after-sales services, reasonable product prices, good customer reputation as we have faith in integrity of the our business philosophy. We realize the common development of customers, employees and enterprises. We have won trust and support of customers from all over the world. Selling steel all over China and mainly exported to South America, Southeast Asia, Middle East, South Africa, Australia and many more. Our company's main products: Various  Carbon Steel and stainless steel pipe and fitting, Cooper tube,  Steel constrcution facbrication, Metal including ERW steel pipe , LSAW STEEL pipe and SSAW STEEL  pipe, Seamless steel pipe and galvanized Zinc steel pipe, square and rectangular steel pipe, steel plates and steel billets.  
    Learned over the years,we provide a strict quality control and  customer service. ALI-STEEL members are always available to discuss your requirements and ensure full customer satisfaction. ALI-STEEL  also welcomes OEM and ODM motors. Wether you select a current product from our catalogue or you seek engineering assistance for your application, you can talk to our customer service center about sourcing requirements.
  Ali steel trading company is a bridge which is helping you to open the window for imports and exports of steel all over the world.
Products are in compliance with the international standards and approved by the third party production. That is why our sales are increasing constantly. A huge credit for which also goes to our customers' valuable feedbacks as they have expressed praise and recognition. You are always welcome to visit our factory.
We  hope to establish a long term cooperation with you.

 

Certifications

 

Product packaging

 

Exhibition

 

Customer Photos

 

FAQ

Q1:How about thequality?
A:Third party inspections are always welcomed, like TUV.   All of the goods will be released together with MTC and stamped by TPI. 
Q2: How long is the delivery time?
A: Generally about 5-10 days if the goods in stock. Or will be 15-20 days if the goods are not in stock. And alsoaccording to the quantity.
Q3:Do you provide samples? Free or not?
A: Yes, we could offer the sample for free but do not pay the cost of freight.
Q4:May I customize the steel pipe?
A:Sure you can, we can produce according to your requirement, you can send the CAD ordesign drawing.
Q5:Any value-added Services?
A:Fottunately for you,we are very experience in this industry. We have equipped our warehouse with the necessitiesto perform in-house painting,coating,pipe cutting, jointed welding, and make machanical fabricate per to request.  
Q6: How about the trade terms?
A: EXW, FOB, CFR, CIF, LC will be accepted.