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AN936

A and B designators?
Shakeproof washer (Star)
A = internal
B = external
Clevis Pins:
ID AN#, size and length.
392 = 1/8th diameter
393 = 3/16th
394 = 1/4
length is in odd 32nd. Need exact length. Shear device only.
AN24-10
Clevis bolt: 1/4-28 bolt, 1 inch long.
Sheet metal screws
Designations
AN???-X-Y
AN530 = round head
AN531 = Flush head
X = tap size
Y = length in 1/16ths.
Clevis Bolts:
ID 21 through 26

Shear device with shank hole for more permanent installation.
21 = #6 machine screw
22 = #8
23 = #10
24 = 1/4 bolt 28tpi
25 = 5/16 -24tpi
26 = 3/8 - 24
Rivets designators for alloy:
A, AD, DD, D
A = soft AL, non-structural, all others are structural.
AD = most common, 2117 alloy.36kpis
DD = 2024, 44kpsi
D = 2017 40kpsi
Rivet designators:
AN430-TT_X-Y
What is TT, X, Y. How specified?
TT is alloy:
X = diameter in 32ndsd,
Y = length in 16ths.
AN507 and 509
507 = machine screw 100 degree countersink. non -structural.
509 = same but structural.
AN526 and AN525
526 = button or truss head, wider and flatter typ. non structural. 65k psi. TPI not in designator- same as bolts (624, 1032, 428.)
525 = Washer head, structural 125k psi. includes extra washer under head.
AN505 and 510
82 degree countersink machine screws.
505 = NC non-structural
515 = NF non-structural
AN515 and 520
Round head machine screws.
515 = NC, non structural
520 = NF, non-structural
AN515-8R16
Machine screw, round head, non structural, #8 screw1 " long, 32 TPI NC.
AN501-416-6
Fillister head, no hole, nonstructural, 1/4-28 TPI, 6/16 long or 3/8th.
AN500-10-12, 10R12
Fillister head, non-structural, NC, #10 screw size, 12/16 long.
10R12 = #10 screw, Phillips head 3.4 inch long.
Machine screws diameter and length.
AN500- X-Y
Length = ?
Diameter = ?
Phillips designator =
x = diameter in tap sizes. or bolt is with 16, 416 is 1/4-28.

Y = Length, always in 1/16th.

Phillips = R,
Fillister Head Designations
What are:
AN500, 501, 502, 503
500 = Fillister, no hole, NC
501, Fillister, no hole, NF (A for drilled)
55,000 psi tensile strength.....
502, FIllister, hole, NF
503, Fillister, hole, NC
125,000 psi tensile strength
How is thread pitch indicated in Machine Screws?
It is contained in the AN designator, unlike bolts (always NF).
Machine Screw
Explain grip for Fillister head vs. flat head?
Grip is the unthreaded length from the start of the threads to (flat head) the top of the head, and to (Fillister head) bottom of head.
Cotter Pins?
How is diameter and length specified?

What are designators?
Diameter is in 1/32nd.

Length is in 1/4 inch.
AN380-3-4 is a cad. plated steel pin, 3/32nd diameter, 1 inch long.
AN381 is SST.
AN935
Split locking washer, use with AN960 flat washer.
Washer other designators?
What is AN960-10L?
AN970?
AN960-10L is a standard washer for a #10 machine screw. L = light or 1/2 thickness.
AN970 is a larger diameter washer.
Washer sizing?

How is hole designated?
ANdesignator then - for hole size.
- 4, 6, or 8 for machine screws.
- X (in 1/16ths) and TPI for bolts.
AN960-8 is a plain washer, cad plated, #8 screw.
-816 same but for a bolt.
What is the purpose of washers?
Spacer
Protect material under nut.
Prevent bolt from turning.
Locking feature.
Spread load.
NUT designators? How do you designate SST for nuts?
Add a "C" after the AN designator.
AN310C-524 is a standard castle nut, SST for a 5/16 bolt 24 TPI or NF.
AN350
Wing nut.
AN364
Fiber Lock Shear Nut - thick big brother is the AN365.
AN316
Airframe Plane Shear, carries 1/2 tension as AN315, full size Plane Nut.
AN320
Casltelated shear nut.
What is a Shear Nut?
Used in shear tension applications, not tension, so 1/2 the threads are used.
AN315
Plane nut - has larger flat on bottom
AN365
Fiber lock nut torqued to work. Shear equal is the AN364.
AN360
Plane Engine nut Steel but high temperature
AN310
Common Castle nut
AN363
Steel Lock Nut - top is squeezed or oval for self locking.
Nut designations?
AN365
Fiber lock nut
What is AN310-428?
Castlelated nut, 1/4 bolt NF.
Nut sizing or Y.

Machine screws?
Bolts?
Machine screws = - size, typ. -4, -8, -10 (equal to -3 bolt.

Bolts - size in 16th. Include TPI
NUTS
ANXXX-Y

What is x and Y?
XXX is AN designator.

Y = TPI
SAE Standards have a number of Hash marks on the head. What do they mean?
They indicate the grade of bolt. Add 2 to the number of Hash marks for grade.
Grade 5 and 8 are common. 8 is same strength as AN but no QC.
Bolt exceptions:
A = ? after length
C = ? before length
H = ? replacing dash
A = absent hole in shank
C = CRES
H = Hole in Head
AN Bolt Dimensioning
ANX-Y

What is X and Y?
What is a AN4-10
X = diameter in 1/16th.
Y = length in 1/8ths base 8

AN4-10 is 1/4 inch bolt NF thread, 1 inch long.
AN bolt head markings for:
CRES
AL
Close Tolerance
Alloy Steel
CRES = single raised dash
AL = Two raised hash marks opposite each other
Close Tolerance = cross inside triangle
Alloy Steel =x or + (cross)
What are the characteristics of a AN Bolt?
Hex Head
Mild Steel construction
125,000 PSI Tensile strength
Cadmium Plating - gold color
NF National Fine Thread
Class 3 (.003) fit
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