Quantcast Bolt Material

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
Figure 2-22.—Bolt head markings. there is a different number of coarse and fine threads per inch.    For instance, consider the 1/4-inch bolts. Some are called 1/4-28 bolts because they have 28 fine threads per inch. Others have only 20 coarse threads per inch and are called 1/4-20 bolts. To force one size of threads into another size, even though both are 1/4 of an inch, can strip the finer threads or softer metal. The same thing is true concerning the other sizes of bolts; therefore, make certain that bolts you select have the correct type of threads. BOLT MATERIAL.—The type of metal used in an aircraft bolt helps to determine its strength and its resistance to corrosion. Therefore, make certain that material is considered in the selection of replacement bolts. Like solid shank rivets, bolts have distinctive head markings that help to identify the material from which they are manufactured. Figure 2-22 shows the tops of several hex-head bolts, each marked to indicate the type of bolt material. BOLT IDENTIFICATION.—Unless current directives specify otherwise, every unserviceable bolt should be replaced with a bolt of the same type. Of course, substitute and interchangeable items are sometimes available, but the ideal fix is a bolt-for-bolt replacement. The part number of a needed bolt may be obtained by referring to the illustrated parts breakdown (IPB) for the aircraft concerned. Exactly what this part number means depends upon whether the bolt is AN (Air Force-Navy), NAS (National Aircraft Standard), or MS (Military Standard). AN Part Number.—There are several classes of AN bolts, and in some instances their part numbers reveal slightly different types of information. However, most AN numbers contain the same type of information. Figure 2-23 shows a breakdown of a typical AN bolt part number. Like the AN rivets discussed earlier, it starts with the letters AN. Next, notice that a number follows the letters. This number usually consists of two digits. The first digit (or absence of it) shows the class of the bolt. For instance, in figure 2-23, the series number has only one digit, and the absence of one digit shows that this part number represents a general-purpose hex-head bolt. However, the part numbers for some bolts of this class have two digits. In fact, general-purpose hex-head bolts include all part numbers beginning with AN3, AN4, and so on, through AN20. Other series numbers and the classes of bolts that they represent are as follows: AN21 through AN36—clevis bolts AN42 through AN49—eyebolts The series number shows another type of information other than bolt class. With a few exceptions, it indicates bolt diameter in sixteenths of Figure 2-23.—AN bolt part number breakdown. 2-18



Aviation News
ANA Holdings firms up order for A320neo Family
ANA to become first A320neo operator in Japan Share this...
airbus.com
One Year of Success with Airbus Managed Inventory for Latin America MRO Aeroman
Aeroman, an El Salvador based Maintenance Repair and Overhaul (MRO)...
airbus.com
DAC International Achieves STC on New Software Products
[Avionics Today 07-30-2014] DAC International, has received Parts Manufacturer Approval...
aviationtoday.com
Exelis Delivers Latest Electronic Warfare Technology for F/A-18s
[Avionics Today 07-30-2014] Exelis has delivered the first nine electronic...
aviationtoday.com
Flight Restrictions for African Leaders Summit
Flight restrictions in place over Washington, DC for the U.S.-African...
faa.gov
Airbus terminates purchase order with Skymark Airlines for A380s
Following discussions with Skymark Airlines and in light of the...
airbus.com
Australian Audit Office Slams MRH90 Project
The Australian Government ordered the MRH90 – an Australian variant...
aviationtoday.com
Aircraft and honey: Bees are playing a key role in “monitoring” Airbus’ environmental footprint
Airbus’ comprehensive families of market-leading widebody and single-aisle aircraft aren’t...
airbus.com
AIRBUS A350 XWB arrives in Hong Kong for NG FOR THE FIRST TIME EVER
The world’s newest, most modern and efficient aircraft, the Airbus...
airbus.com
UK MoD to Integrate New Missile System on Navy, Army AgustaWestland AW159 Wildcats
The UK Ministry of Defence (MoD) has enlisted AgustaWestland to...
aviationtoday.com
The A350 XWB embarks on final certification phase
World route proving tour to visit 14 cities Share this...
airbus.com
FAA Statement-FAA Lifts Flight Restrictions for Ben Gurion International Airport
Agency continues to monitor the very fluid situation and will...
faa.gov
FAA Statement-Notice to Airmen Extended for Ben Gurion International Airport
Yesterday's notice is still in effect for up to an...
faa.gov
Hawaiian Airlines to order six A330-800neo aircraft
First U.S. airline to join launch list for new aircraft...
airbus.com
Boeing Reports $22 Billion 2Q Revenue
[Aviation Today July 23, 2014] Boeing reported total revenue of...
aviationtoday.com
FAA Statement-Notice to Airmen Issued for Ben Gurion International Airport
U.S. airlines prohibited from flying to or from the airport...
faa.gov
A350 XWB MSN001 successfully conducted ‘Maximum Energy Rejected Take-Off’ test
Airbus has successfully performed the ‘Maximum Energy Rejected Take-Off’ (MERTO)...
airbus.com
TTTech Releases Next Generation of its TTP Controller
[Avionics Today July 21, 2014] TTTech has released the third generation...
aviationtoday.com
Exelis to Provide SANG ATM Upgrade
[Avionics Today July 21, 2014] Exelis is providing its GCA-2020...
aviationtoday.com
Ready to board: Airbus issues the latest edition of the “Shaping Efficiency” magazine
Step inside the all-new A350 XWB with Issue no. 6...
airbus.com


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +