lot of 33 new NAS 632-38 AIRCRAFT AEROSPACE 12 POINT shear BOLT 3/4" DIA X 80mm

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Current Price: 600.00 USD

BRAND NEW LOT OF 33 INDIVIDUALLY PACKAGED NAS-632-38 AIRCRAFT BOLTS

"AN" (AIRFORCE-NAVY) aircraft flare and 37 degree industrial (JIC) flare, function identically.
\
"NAS" (NATIONAL AEROSPACE STANDARDS) and "MS" (MILITARY SPECIFICATION) and industrial UNF-2A/B function identically.

In many cases they appear to be functionally interchangeable, but they are not"

quote from Parker Aerospace Fitting Solutions Series No.11

Aircraft AN fittings are manufactured to MIL-F-5509 per AN (Air Force - Navy Aeronautical Standard) and AND (Air Force - Navy Aeronautical Design Standard).

Industrial 37 degree flare fittings are manufactured to meet SAE J514/ISO-8434-2. Straight threads are per MIL-S-8879C now SAE-AS8879.

The most notable difference between these standards are in the threads. AN fittings use a increased root radius thread ("J" thread) and a tighter tolerance (Class 3) to achieve a 40% increase in fatigue strength and 10% increase in shear strength (thread tensile stress area of 110.76 compared to 103.20 mm2 ). This difference is stated in the thread designation, For example:
AN Fitting: 1/2-20 UNJF-3B
Industrial: 1/2-20 UNF-2B
These two fittings function the same, they look the same, AND the industrial version is much less expensive to manufacturer. The problem is that the industrial version is 40% weaker.

There is a an Airworthiness Directive (90-04-06) involving breaking of the aluminum propeller governor fitting on Lycoming engines. The aluminum AN fitting was used successfully for decades before they started breaking. The justice department brought charges against a company that was selling these fittings as AN when they were in fact industrial. Sometimes the higher strength serves an important purpose.

Aircraft are vibrating structures, much more so than most industrial applications. Vibration fatigues the threads, so aircraft hardware uses a modified thread form and tighter tolerance to increase fatigue strength. This is true not only for AN fittings but also for AN and NAS bolts, and installed hose "B" nut fittings. These aircraft hardware items are also UNJF-3A/3B whereas the industrial is UNF-2A/B.

How do you tell them apart?
You cannot visually see a tolerance or an increased root radius. These are measured with special equipment. Some fittings sold as "AN" are industrial grade.

What about AN marking?
MIL-P-5509D requires that all flared tube fittings and nuts shall be marked with the letters AN or MS and the manufacturer's identification or trademark. Sleeves must be trademarked. Letters AN or MS on sleeves are optional. I have found fittings marked "AN" that do not meet AN tolerances (Class 2 instead of Class 3).

Tapered Pipe Threads
Tapered pipe threads for aerospace are ANPT whereas the commercial version of a tapered pipe thread is NPT. ANPT specifications, formerly MIL-P-7105B are now part of SAE AS571051. ANPT is essentially a NPT thread with extensive testing, gauging, sampling, NDT, and other quality control requirements. ANPT threads are required to meet two additional gaging methods, the L2 and the 6-step.

Inspection
MIL-F-5509D for flared aircraft fittings has extensive quality assurance provisions, including sampling for NDT tests, sampling for destructive tests, Lot identification, and Material Certification, Tensile strength tests, Finish tests.

How can you protect yourself?
Aircraft AN fitting is more expensive so it will not be the least expensive fitting. The least expensive fitting is almost guaranteed to be industrial.
Instead of ordering "AN Fittings" - specify conformance to MIL-F-5509 or specify sizing to UNJF-3B/3A. Purchase from aircraft sources rather than sources that sell industrial/aircraft.

What if it doesn't matter?
It always matters if you order and pay for aircraft "AN" quality and standards and receive something inferior. If you don't need "AN" quality, and the industrial version suits your purpose, then fine. Order as a 37 degree (JIC) or Parker Triple-Lok.

How to inspect?
You can determine if a fitting is an AN fitting and not industrial by seeing if it meets Class 3 (aerospace) size tolerance. Measure the pitch diameter using a thread micrometer. The pitch diameter determines whether the part meets Class 3A (aerospace) or 2A (commercial). An adequate thread micrometer costs approximately $150.00. In one batch of 20 AN nipples that I inspected, only 50% were Class 3!

BOLT SPECS

5306-00-905-2981 (NAS632-38) Data

5306-00-905-2981 (5306009052981) NSN Information

NSN	FSC	NIIN	Item Name	INC
5306-00-905-2981	5306	009052981	Bolt, Shear	15903

5306-00-905-2981 Features

MRC	Parameter	Characteristics
AAJD	Thread Class	3A
AAJF	Thread Direction	Right-hand
AASA	Thread Length	0.993 inches minimum
AASB	Fastener Length	3.368 inches nominal
AASK	Head Style	Double hexagon W/hole
AASU	Head Height	0.711 inches nominal
AATB	Width Between Flats	0.808 inches minimum and 0.817 inches maximum
AATC	Extended Washer Diameter	1.225 inches nominal
AATD	Extended Washer Thickness	0.178 inches nominal
AAUR	Grip Diameter	0.7480 inches minimum and 0.7490 inches maximum
AHYM	Nominal Thread Diameter	0.750 inches
ANEE	Grip Length	2.375 inches nominal
CMLP	Thread Quantity per Inch	16
CQBC	Minimum Tensile Strength	180000 pounds per square inch
CQFM	Hardness Rating	39.0 rockwell C minimum overall and 43.0 rockwell C maximum overall
MATT	Material	Steel comp E4340 overall or steel comp 6150 overall or steel comp 4140 overall or steel comp 8735 overall or steel comp 8740 overall
MDCL	Material Document and Classification	MIL-S-5626 mil spec 1ST material response overall or MIL-S-6098 mil spec 4TH material response overall or MIL-S-8503 mil spec 3RD material response overall or MIL-S-5000 mil spec 2ND material response overall or MIL-S-6049 mil spec 5TH material response overall
SFTT	Surface Treatment	Cadmium overall
STDC	Surface Treatment Document and Classification	Nas 672 assn std single treatment response overall
THSD	Thread Series Designator	UNF

5306-00-905-2981 Manufacturing Part Numbers (SKUs)

MFG SKU	CAGE	STATUS	ISC	RNVC	RNCC	SADC	DAC	HCC	RNAAC
NAS632-38	80205	A	2	2	3		4		KE

5306-00-905-2981 Manufacturer

MFG SKU	CAGE	Manufacturer	Type	Status	Role
NAS632-38	80205		A	A

5306-00-905-2981 FLIS Identification

PMIC	ADPE CODE	CRITL CODE	DEMIL CODE	DEMIL INTG	NIIN ASGMT	ESD	HMIC	ENAC	SCHEDULE_B	INC
U		X	A		22-JUN-66		N		7318152000	15903

5306-00-905-2981 FLIS Management

MOE	UNIT PRICE	REC REP CODE	MGMT CTL	USC
DA	$37.60	Z	T2200X-	A
DF	$37.60	N	SF9SX-N	F
DN	$37.60		9B-----	N
DS	$37.60	N	-------	I

5306-00-905-2981 Demilitarization Codes & Management

DML	PMIC	HMIC	ADPEC	Criticality	ESDC
A		N		X

5306-00-905-2981 Miscellaneous Management

MOE (S_A)	SOS	AAC	QUP	UI	CIIC	RC	MCC	SVC
DA	SMS	J	1	EA	U	Z	T2200X-	A
DA	SMS	J	1	EA	U	Z	T2200X-	D
DA	SMS	J	1	EA	U	Z	T2200X-	F
DA	SMS	J	1	EA	U	Z	T2200X-	N
DF	SMS	J	1	EA	U		SF9SX-N	A
DF	SMS	J	1	EA	U		SF9SX-N	D
DF	SMS	J	1	EA	U		SF9SX-N	F
DF	SMS	J	1	EA	U		SF9SX-N	N
DN	SMS	J	1	EA	U		9B-----	A
DN	SMS	J	1	EA	U		9B-----	D
DN	SMS	J	1	EA	U		9B-----	F
DN	SMS	J	1	EA	U		9B-----	N
DS	SMS	J	1	EA	U		-------	A
DS	SMS	J	1	EA	U		-------	D
DS	SMS	J	1	EA	U		-------	F
DS	SMS	J	1	EA	U		-------	N

5306-00-905-2981 Management Control Air Force

FUND	BUDGET	MMAC	PVC
SF	9	SX	N

5306-00-905-2981 Management Control Army

MATCAT 1	MATCAT 2	MATCAT 3	MATCAT 4 5	ARC
T	2	2	00	X

5306-00-905-2981 Management Control Navy

COG	SMIC	IRRC	SMCC
9B

5306-00-905-2981 Freight

NMFC	NMFC SUB	UFC	HMC	LTL	LCL	WCC	TCC	SHC	ADC	ACC	ASH	NMF DESC
093486	Z	48950		Z		573	Z	9	A	B

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lot of 33 new NAS 632-38 AIRCRAFT AEROSPACE 12 POINT shear BOLT 3/4

Click here to purchase or contact the seller of this item on eBay