How do you read aircraft bolts?

The number following the dash indicates the length in eighths (1/8) of an inch up to 7/8. If a bolt is longer than an inch the first digit is the number of inches and the second digit is the number of eighths. For example: AN3-12 is a bolt with 3/16 inch diameter and the length is 1 inch plus 2/8 or 1-1/4 inch long.

How do you identify aircraft bolts?

AN-type aircraft bolts can be identified by the code markings on the bolt heads. The markings generally denote the bolt manufacturer, the material of which the bolt is made, and whether the bolt is a standard AN-type or a special purpose bolt.

What does an on aircraft bolts mean?

AN4-8A. AN means the bolt is manufactured according to Air Force-Navy specs. 4 identifies the diameter of the bolt shank in 1/16″ increments. 8 identifies the length of the shank in 1/8″ increments. A means the shank of the bolt is undrilled (no letter here means a drilled shank)

How do you identify aircraft hardware?

Aircraft hardware is usually identified by its specification number or trade name. Threaded fasteners and rivets are usually identified by AN (Air Force-Navy), NAS (National Aircraft Standard), and MS (Military Standard) numbers.

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What grade are aircraft bolts?

Aerospace Bolts for High-Performance Applications

Alloy Hex Cap Screws: offered in Grade 5 (MS90725 and MS90726); Grade 8 alloy steel or Grade BD alloy steel with zinc coating. Several sizes are available meeting specifications B1821 or Grade 5 MS90725 and MS90726.

What do the numbers on a bolt mean?

There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt.

What does M14 mean on a bolt?

M14 means it is metric with a 14mm outside diameter.

What does the 8.8 on a bolt mean?

If you have ever looked a metric hex bolt you might notice the markings 8.8, 10.9 or 12.9 this does not mean grade 8,10 or 12. The grade 8.8 refers to the tensile strength which is generally 116,000 psi, grade 10.9 is generally 150,000 and grade 12.9 is generally 175,000 psi.

What do the markings on the head of a bolt mean?

You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength. The higher the grade, the stronger the bolt.

What does MS stand for in bolts?

Common Fastener Related Abbreviations

Abbreviation Meaning
MS Machine Screw
MSNT Machine Screw Nut
NC National Coarse Thread
NF National Fine Thread
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What does NAS stand for in aviation?

Every day, the Federal Aviation Administration provides air traffic service to more than 45,000 flights and 2.9 million airline passengers traveling across the more than 29 million square miles that make up the U.S. national airspace system ( NAS ).

How do I know if my bolts are metric or standard?

Telling the difference between a metric and imperial bolt is easy. If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then its metric.

How do I know if my bolts are standard or metric?

For both metric and standard bolts, the head size is the distance across the flats. For standard bolts, the head size is measured in inches or fractions of an inch. For metric bolts, head size is measured in millimeters. However, metric bolt head size is measured in millimeters.