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As of 2/2023 this site no longer supports e-commerce sales. Please visit www.aftfasteners.com to purchase items or email info@aft-corp.com for a quote.

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October 3rd, 2013 at 1:06 pm
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Going from a local metal plating company to an international success in the fastener distribution market takes a passion for success. AFT Industries has been a quality provider of metal plating, fastener importing-distribution, and industrial services for more than a decade now. Providing customers with a cost effective and profitable partnership has been the driving force behind their success. It is with great pride that they are announcing a broad expansion of services for the future. 

 

Recent events include the acquisition of a large distribution center in the heart of Dallas and Fort Worth's shipping community. This modern facility provides a great hub for global sourcing, timely shipping-receiving, inventory warehousing and a great environment for dedicated employees and staff to do business. New facilities were then added to increase capacities in metal plating, wet paint, dry film lube and Xylan® coatings.  To further meet customers' needs, AFT has amplified a global internet presence and global marketing strategy, making communications and requests for fastener pricing and availability easier than ever. Visit www.aftfasteners.com and take a virtual stroll through this user friendly web experience.

 

AFT announces specialized sales departments to cater to high-tech clients with needs in the electronic hardware, MIL-Spec/Aerospace, and industrial services arenas. Dedicated departments provide detail oriented hardware kitting services, fastener modifications, and industry targeted customer specifications. AFT also has recently opened a sales and support department in the greater Houston area. Look for their appearance at the Southwest Design2Part trade show, to be held at the Reliant Center on November 16th and 17th, 2011.

 

Maintaining profitable business relations in these economic times takes an attention to detail and dedication to customer satisfaction, now more than ever before. AFT's  expansion shows that being a dedicated, reliable and "forward thinking" solutions provider can be done and done right.


“Meeting a customer's needs is our number one goal, whether it is an everyday fastener request or a specialized international shipment. Satisfaction and building reliable relationships are AFT's primary objectives.” – Johnny Rose, President

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October 3rd, 2013 at 1:06 pm
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Usually fastener standards specify two types of marks to be on the head of a bolt. The manufacturer's mark is a symbol identifying the manufacturer (or importer). This is the organization that accepts the responsibility that the fastener meets specified requirements. The "Grade Mark" is a standardized mark that identifies the material properties that the fastener meets. For example 307A on a bolt head indicates that the fastener properties conform to the ASTM A307 Grade A standard.

Both marks are usually located on the top of the bolt head, most standards indicating that the marks can be raised or depressed. Raised marks are usually preferred by manufacturers because these can only be added during the forging process whereas depressed marks can subsequently be added (possibly with illegitimate marks).

 

 

The below listed Table is a listing of some of the more common Bolt Head Markings. If you have questions about a bolt head marking or specification, do not hesitate to Contact Us via our electronic form or call us at 877-844-8595.

  

 

 

Hex Bolt Head Markings

SAE Bolt Designations

 

SAE

Grade

No.

 

Size

Range

 

Tensile

strength,

ksi

Material

 

Head

Marking

1

 

 

2

 

1/4" thru 1 1/2"

 

1/4" thru 3/4"

 

7/8" thru 1 1/2"

 

60

 

74

 

60

 

Low or medium

carbon steel

5

1/4" thru 1"


1 1/8" thru 1 1/2"

120


105

Medium Carbon Steel,

quenched & tempered

5.2 1/4" thru 1" 120 Low carbon
martensite steel,
quenched & tempered
7 1/4" thru 1 1/2" 133 Medium carbon
alloy steel,
quenched & tempered
8 1/4" thru 1 1/2" 150 Medium carbon
alloy steel,
quenched & tempered
8.2 1/4" thru 1" 150 Low carbon
martensite steel,
quenched & tempered

 

ASTM Bolt Designations

ASTM

Standard

 

Size

Range

 

Tensile

strength,

ksi

Material

 

Head

Marking

A307 1/4" thru 4"

 

60

 

Low Carbon Steel

A325

Type 1

1/2" thru 1"
1 1/8" thru 1 1/2"

120

105

Medium carbon steel,
quenched & tempered

A325

Type 2

1/2" thru 1"
1 1/8" thru 1 1/2"

120

105

 

Low carbon
martensite steel,
quenched & tempered

A325

Type 3

1/2" thru 1"
1 1/8" thru 1 1/2"

120

105

 

Weathering steel,
quenched & tempered
A449 1/4" thru 1"
1 1/8" thru 1 1/2"
1 3/4" thru 3"

120

105

90

 

Medium carbon steel,
quenched & tempered

A490

Type 1

1/4" thru 1 1/2" 150 Alloy steel,
quenched & tempered

A490

Type 3

1/4" thru 1 1/2" 150 Weathering steel,
quenched & tempered

 

Often one will find "extra" marks on a bolt head--marks in addition to those shown above. Usually these marks indicate the bolt's manufacturer.

 

ASTM A325 Type 2 bolts have been discontinued, but are included above because they can be found in existing structures. Their properties can be important in failure investigations.

 

While the bolts shown above are among the most common in the U.S., the list is far from exhaustive. In addition to the other bolts covered by the SAE and ASTM standards, there are a host of international standards, of which ISO is perhaps the most well known.

 

-AFT Team

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   AFT Supply offers over 200,000 products to ensure your satisfaction.

If we have not yet added your specific product, please contact us or complete a quote form.

 

 

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