Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100

Place of Origin CHINA
Brand Name QBH
Certification ISO9001
Model Number ANSI-A325M M12-M36
Minimum Order Quantity 900kg
Price Negotiation
Packaging Details 25kg Carton+900kg/Pallet
Delivery Time 30days
Payment Terms L/C, T/T,OA
Supply Ability 500TON/MONTH

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Product Details
Material 1035 1045 40CR Size M12-M36
Surface Treatment DACROMET 500A Or 500B Grade A325M
Process Cold Forging,Hot Forging Sample Free Sample
Head Type Hex Head Application Industry,BUILDING
Length 10mm-800mm Keyword HEAVY HEX STRUCTURAL BOLTS
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Dacromet Heavy Hex Bolts


A325M Heavy Hex Bolts


A563M Heavy Hex Nuts

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Product Description







ASTM Standards

A153/A153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

A563M Specification for Carbon and Alloy Steel Nuts (Metric)

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel

D3951 Practice for Commercial Packaging

F436M Specification for Hardened Steel Washers (Metric)

F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets (Metric)

F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series

F959M Specification for Compressible-Washer-Type Direct Tension Indicators for Use With Structural Fasteners (Metric)

F1136M Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners (Metric)

F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection

F1789 Terminology for F16 Mechanical Fasteners

G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels

ASME Standards

B 1.13M Metric Screw Threads

B 18.18.3M Inspection and Quality Assurance for Special Purpose Fasteners

B Metric Heavy Hex Structural Bolts

B 18.24 Part Identifying Number (PIN) Code System Standard for B18 Fastener Products



This specification covers two types of quenched and tempered, steel, metric heavy hex structural bolts having a minimum tensile strength of 830 MPa (Note 1).


Formerly under the jurisdiction of Committee F16 on Fasteners, this specification was withdrawn in May 2016 and replaced by Specification F3125/F3125M for High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions. Specification F3125/F3125M supersedes and replaces specifications; A325, A325M, A490, A490M, F1852 and F2280. The unified Specification F3125/F3125M corrects known inconsistencies in the original documents and the combination will assure that requirements of the products covered under the original standards stay aligned.



Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 0

Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 1

Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 2

Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 3





A563M  Specification


ASTM A563M Heavy Hex Nuts (Metric)  for use with ASTM A325M Bolts


This ASTM A563 and ASTM A563M heavy hex nuts specification covers chemical and mechanical requirements for eight property classes of hex and hex-flange carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.


Note 1: Throughout this specification, the term class means property class.


Note 2: Requirements for the four classes 5, 9, 10, and 12 are essentially identical with requirements given for these classes in ISO 898/II. Requirements for Classes 8S and 10S are essentially identical with requirements in an ISO 4775 Hexagon Nuts for High-Strength Structural Bolting with Large Width Across Flats, Product Grade B, Property Classes 8 and 10. Classes 8S3 and 10S3 are not recognized in ISO standards.


1.2 Classes 8S3 and 10S3 nuts have atmospheric corrosion resistance and weathering characteristics comparable to those of the steels covered in Specification A 588/A 588M. The atmospheric corrosion resistance of these steel’s substantially is better than that of carbon steel with or without copper addition. and when properly exposed to the atmosphere, these steels can be used bare (un-coated) for many applications.


1.3 The nut size range for which each class is applicable is given in the table on mechanical requirements.

ASME A563M 8S 10S A325M M12 to M36 Carbon Steel Nuts 0



1. The nuts will generally conform to ANSI B18.2.4.1M – Metric Heavy Hexagonal Nuts

2. Thread will conform to class 6H of ANSI B1.13M for Coarse Series

3. Material & Heat Treatment: To achieve mechanical properties of Properties Class 8S or 10S of ASTM A563M.

4. Nuts of Property Class 8S are used with bolts of ASTM A325M – Type 1 (uncoated). Nuts of Property Class 10S are used with bolts of ASTM A325M – Type 1(Zinc– coated) (in general nuts of a higher property class can replace nuts of a lower property class in a joint).

5. In Bolt/Nut assembly, tightening should be done by rotation of nut.

6. Sizes in brackets are non preferred standards.

7. All dimensions are in millimeters.



A563M Nut Dimension Classes 8S & 10S




Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 5


size and
thread pitch
S E M dw C Total
runout of
Width across flats Width across corners Thickness Bearing face diameter Washer face thickness
max min max min max min min max min max
M16 x 2 27 26.16 31.18 29.56 17.1 16.4 24.9 0.8 0.4 0.47
M20 x 2.5 34 33 39.26 37.29 20.7 19.4 31.4 0.8 0.4 0.58
M22 x 2.5 36 35 41.57 39.55 23.6 22.3 33.3 0.8 0.4 0.63
M24 x 3 41 40 47.34 45.2 24.2 22.9 38 0.8 0.4 0.72
M27 x 3 46 45 53.12 50.85 27.6 26.3 42.8 0.8 0.4 0.8
M30 x 3.5 50 49 57.74 55.37 30.7 29.1 46.6 0.8 0.4 0.87
M36 x 4 60 58.8 69.28 66.44 36.6 35 55.9 0.8 0.4 1.05


Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 6


Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 7


Dacromet Heavy Hex Bolts Heavy Hex Nuts A325M A563M F436M F959M M22X100 8


Process flow


Cold forging

Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment ➨ Finish ➨ Packing


Hot forging

Cutting material ➨ hot forging ➨ turning ➨ shrink diameter(half thread) ➨thread rolling ➨ make heat treatment ➨ Finish ➨ Packing



Product Grade


Grade 8S Grade 10s



Materials and Chemical compstition



C Si Mn P S Cr Ni Cu
0.34 0.13 0.73 0.012 0.002 0.02 0.01  0.02 




C Si Mn P S Cr Ni Cu
0.45 0.23 0.58 0.014 0.006 0.057 0.008 0.016



C Si Mn P S Cr Ni Cu
0.4 0.21 0.54 0.015 0.008 0.95 0.02  0.02 


















Packing in small boxes according to customer’s requirements

Packing in plastic bag according to customer’s requirements




EURO Pallet





The advantages of QBH

  • QBH brand sales to the main quality assurance.
  • Years of export trade management, excellent service, word-of-mouth guarantee.
  • By working with TUV,escort for quality.
  • Customization of non-standard parts can be made according to customer's requirements and drawings.
  • For quality customers,we can provide a certain credit period.




      In brief Type 3 grade A325 bolts shall be marked “A325” to distinguish them from standard grade A325s. Likewise Grade A490 bolts are available in diameters from 1/2 to 1-1/2 inch diameters with a minimum tensile strength of 150,000 PSI for all diameters, and are offered in two types.

      In Fact ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1⁄2 to 1 1⁄2 inches (13 to 38 mm) in diameter.

      In accordance with ASTM A325, all threaded components of the fastener assembly must be galvanized by the same process and the supplier’s option is limited to one process per item with no mixed processes in a lot.



      This Specification deals principally with two strength grades of high-strength bolts, ASTM A325 and A490, and with their design, installation and inspection in structural steel joints. Equivalent fasteners, however, such as ASTM F1852 (equivalent to ASTM A325) twist-off-type tension-control bolt assemblies, are also covered. These provisions may not be relied upon for high-strength fasteners of other chemical composition, mechanical properties, or size. These provisions do not apply when material other than steel is included in the grip; nor are they applicable to anchor rods. This Specification relates only to the performance of fasteners in structural steel joints and those few aspects of the connected material that affect this performance. Many other aspects of connection design and fabrication are of equal importance and must not be overlooked. For more general information on design and issues relating to high-strength bolting and the connected material, refer to current steel design textbooks and the Guide to Design Criteria for Bolted and Riveted Joints, 2 nd Edition (Kulak et al., 1987).






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. Do you accept small order?
QBH company can accept small orders if we have them in stock.Generally speaking,the stock probability of stainless steel fasteners is higher than that of carbon steel fasteners.
6. How about your delivery time
What we pursure is the high efficiency movement pattern,the stainless steel fastener delivery time about 15days,the carbon steel fastener will it about 30days
7. 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.
8. 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