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Sheet metal screws
Designations
AN???-X-Y |
AN530 = round head
AN531 = Flush head
X = tap size
Y = length in 1/16ths. |
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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. |
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| AN24-10 |
Clevis bolt: 1/4-28 bolt, 1 inch long. |
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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 |
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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 |
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Rivet designators:
AN430-TT_X-Y
What is TT, X, Y. How specified? |
TT is alloy:
X = diameter in 32ndsd,
Y = length in 16ths. |
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| AN507 and 509 |
507 = machine screw 100 degree countersink. non -structural.
509 = same but structural. |
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| 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. |
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| AN505 and 510 |
82 degree countersink machine screws.
505 = NC non-structural
515 = NF non-structural |
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| AN515 and 520 |
Round head machine screws.
515 = NC, non structural
520 = NF, non-structural |
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| AN515-8R16 |
Machine screw, round head, non structural, #8 screw1 " long, 32 TPI NC. |
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| AN501-416-6 |
Fillister head, no hole, nonstructural, 1/4-28 TPI, 6/16 long or 3/8th. |
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| AN500-10-12, 10R12 |
Fillister head, non-structural, NC, #10 screw size, 12/16 long.
10R12 = #10 screw, Phillips head 3.4 inch long. |
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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, |
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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 |
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CAVUMark Sat, 17 May 2008 15:24:39 GMT |
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| How is thread pitch indicated in Machine Screws? |
It is contained in the AN designator, unlike bolts (always NF). |
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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. |
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CAVUMark Sat, 17 May 2008 15:24:39 GMT |
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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. |
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AN936
A and B designators? |
Shakeproof washer (Star)
A = internal
B = external |
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CAVUMark Sat, 17 May 2008 23:04:02 GMT |
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| AN935 |
Split locking washer, use with AN960 flat washer. |
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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. |
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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. |
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| What is the purpose of washers? |
Spacer
Protect material under nut.
Prevent bolt from turning.
Locking feature.
Spread load. |
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| 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. |
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| AN350 |
Wing nut. |
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| AN364 |
Fiber Lock Shear Nut - thick big brother is the AN365. |
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| AN316 |
Airframe Plane Shear, carries 1/2 tension as AN315, full size Plane Nut. |
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| AN320 |
Casltelated shear nut. |
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| What is a Shear Nut? |
Used in shear tension applications, not tension, so 1/2 the threads are used. |
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| AN315 |
Plane nut - has larger flat on bottom |
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| AN365 |
Fiber lock nut torqued to work. Shear equal is the AN364. |
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| AN360 |
Plane Engine nut Steel but high temperature |
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| AN310 |
Common Castle nut |
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| AN363 |
Steel Lock Nut - top is squeezed or oval for self locking. |
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Nut designations?
AN365 |
Fiber lock nut |
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| What is AN310-428? |
Castlelated nut, 1/4 bolt NF. |
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Nut sizing or Y.
Machine screws?
Bolts? |
Machine screws = - size, typ. -4, -8, -10 (equal to -3 bolt.
Bolts - size in 16th. Include TPI |
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NUTS
ANXXX-Y
What is x and Y? |
XXX is AN designator.
Y = TPI |
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| 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. |
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Bolt exceptions:
A = ? after length
C = ? before length
H = ? replacing dash |
A = absent hole in shank
C = CRES
H = Hole in Head |
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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. |
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CAVUMark Sat, 17 May 2008 15:24:39 GMT |
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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) |
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CAVUMark Sat, 17 May 2008 15:24:39 GMT |
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| 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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