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Panther Builders Manual

AN935, MS35338 Split lock washers

Split lock washers are typically used to lock non-structural hardware, typically electrical/avionics items.  For structural items, self-locking hardware is preferred.

Current spec: NASM35338 (still uses MS35338 for part number)

Commonly used sizes

Nominal size

Steel

 

 

 

Old

New

Stainless Steel

OD

Thickness

#6 (.138)

AN935-6

MS35338-41

MS35338-136

.250

.031

#8 (.164)

AN935-8

MS35338-42

MS35338-137

.293

.040

#10 (.190)

AN935-10

MS35338-43

MS35338-138

.334

.047

1/4”

AN935-416

MS35338-44

MS35338-139

.487

.062

5/16”

AN935-516

MS35338-45

MS35338-140

.583

.078

3/8”

AN935-616

MS35338-46

MS35338-141

.680

.094

7/16”

AN935-716

MS35338-47

MS35338-142

.776

.109

1/2"

AN935-816

MS35338-48

MS35338-143

.869

.125

 

 

AN960 Flat washers

 

The an960 flat washer is available in Stainless, steel, and  Aluminum and typically 2-3 thicknesses.  The AN960 spec was replaced in 2011 by the NAS1149 specification.

 

Material:

 ‘-‘ Carbon steel cad plated

 ‘C’ Stainless steel

 ‘D’ Aluminum

 

The aluminum washers are available in several finishes:

 ‘J’ – Chemical conversion coating (alodine) and is rarely used

 ‘K’ – Anodized (most common in aviation at this time)

 ‘P’ – older form of anodize (designation canceled in 1982 see note below)

 ‘D’ – Untreated, used mainly for ground studs.

 

Size:        for screw sizes 3-11, use the screw size

 For bolts ¼” or larger use the diameter in 1/16” increments and add 16 to the end

 

Thicknesses:

 ‘LL’ – Very thin

 ‘L’ – Thin

 No code,  standard thickness

 

The PD finish was superseded by the KD code in 1982, however Aircraft Spruce and others still actively use the PD code.  Most likely the washers you receive will technically be KD.  Since PD is so prevalent, we will continue to use the PD coding.

 

Normal Usage: It is typically recommended to use a washer with the same material it is against.  This allows the washer to act as a sacrificial item to reduce chance of corrosion on the actual part.  But if the bolt is in tension, it is usually recommended to use the steel or stainless steel.

 

Typically you want to have at least one under the nut, but usually no more than 2.

For structures where damage can easily occur, use a thin one under the head.

 

AN960 continued

Bolt or screw size

 

 

Hole dia.

 

 

Outside diameter

 

 

Thickness

 

 

 

Steel

 

 

 

Stainless

 

 

Aluminum

KD finish

 

 

Aluminum

PD finish

 

 

Aluminum No finish

4

.125

.312

.016

.032

-4L

-4

-C4L

-C4

-KD4L

-KD4

-PD4L

-PD4

-D4L

-D4

6

.140

.375

.016

.032

-6L

-6

-C6L

-C6

-KD6L

-KD6

-PD6L

-PD6

-D6L

-D6

8

.174

.375

.016

.032

-8L

-8

-C8L

-C8

-KD8L

-KD8

-PD8L

-PD8

-D8L

-D8

10

.203

.438

.016

.032

.063

 

-10L

-10

 

-C10L

-C10

-KD10LL

-KD10L

-KD10

-PD10LL

-PD10L

-PD10

-D10L

 

-D10

¼”

.265

.500

.016

.032

.063

 

-416L

-416

 

-C416L

-C416

-KD416L

 

-KD416

-PD416L

 

-PD416

-D416L

 

-D416

5/16”

.328

.562

.016

.032

.063

 

-516L

-516

 

-C516L

-C516

-KD516L

 

-KD516

-PD516L

 

-PD516

-D516L

 

-D516

3/8”

.390

.625

.016

.032

.063

-616LL

-616L

-616

-C616LL

-C616L

-C616

-KD616L

 

-KD616

-PD616L

 

-PD616

-D616L

 

-D616

7/16”

.453

.750

.016

.032

.063

 

-716L

-716

 

-C716L

-C716

-KD716L

 

-KD716

-PD716L

 

-PD716

-D716L

 

-D716

½”

.515

.875

.016

.032

.063

 

-816L

-816

 

-C816L

-C816

-KD816L

 

-KD816

-PD816L

 

-PD816

-D816L

 

-D816

9/16”

.578

1.062

.016

.032

.063

 

-916L

-916

 

-C916L

-C916

-KD916L

 

-KD916

-PD916L

 

-PD916

-D916L

 

-D916

5/8”

.640

1.188

.016

.032

.063

 

-1016L

-1016

 

-C1016L

-C1016

-KD1016L

 

-KD1016

-PD1016L

 

-PD1016

-D1016L

 

-D1016

¾”

.765

1.312

.016

.032

.063

 

-1216L

-1216

 

-C1216L

-C1216

-KD1216L

 

-KD1216

-PD1216L

 

-PD1216

-D1216L

 

-D1216

 

 

AN970 Flat Washer, oversized Steel Cad plated

 

Typically used where a large bearing surface is required, on flight controls to retain rod end bearings, in areas where larger size makes it easier to install multiple washers.

 

Dash number is for size of screw/bolt in 1/16” increments

 

Current spec: NASM 970 (still uses AN970 for part number)

 

Dash Number

Bolt Size

Hole diameter

Outside Diameter

Thickness

-3

#10 (3/16”)

.203

.875

.063

-4

¼

.265

1.125

.063

-5

5/16

.328

1.375

.063

-6

3/8

.390

1.625

.063

-7

7/16

.453

1.812

.109

-8

½

.515

2.000

.109

-9

9/16

.578

2.188

.125

-10

5/8

.640

2.375

.125

 

 

MS51412 Flat Washer (diameter is between AN960 and AN970)

Typically used where heavy washer is required and as a reduced diameter safety washer in place of the AN970.

Material: Steel washers are Grades 1008 through 1020  Alloy steel is Grade 4130

 

Specification cancelled, no known replacement.

Dash Numbers

Inside diameter

Outside

Diameter

Thickness

(Nominal)

Thickness Range

Carbon steel

Alloy steel

Min.

Max.

20

20A

.156

.281

.020

.016

.025

1

1A

.156

.375

.049

.036

.065

18

18A

.188

.438

.049

.036

.065

2

2A

.219

.500

.049

.036

.065

3

3A

.250

.562

.049

.036

.065

21

21A

.219

.656

.062

.055

.069

22

22A

.234

.375

.049

.043

.051

23

23A

.266

.812

.109

.075

.119

24

24A

.266

1.000

.064

.059

.069

4

4A

.281

.625

.065

.043

.051

36

36A

.281

.968

.049

.046

.119

37

37A

.281

2.000

.062

.051

.080

5

5A

.312

.734

.065

.051

.080

25

25A

.344

1.000

.062

.059

.067

 

NAS1149 Flat washers

 

Material:

 ‘A’ Aluminum 2024-T81

 ‘B’ Brass

‘F‘ Carbon steel cad plated

 ‘C’ Stainless steel

 ‘D’ Aluminum 2024-T3

 ‘G’ Alloy steel

 

The aluminum washers are available in several finishes:

 ‘H’ – Untreated

‘J’ – Chemical Treat

 ‘K’ – Anodized (most common in aviation at this time)

 ‘P’- Cadmium Plated

 ‘R’- Passivated

 

Size:        for screw sizes 3-11, use the ‘N’ + screw size

 For bolts ¼” or larger use the diameter in 1/16” increments and add 16 to the end

 

Thicknesses:

 Use the thickness in decimal

 

Normal Usage: It is typically recommended to use a washer with the same material it is against.  This allows the washer to act as a sacrificial item to reduce chance of corrosion on the actual part.  But if the bolt is in tension, it is usually recommended to use the steel or stainless steel.

 

Typically you want to have at least one under the nut, but usually no more than 2.

For structures where damage can easily occur, use a thin one under the head.

 

Part number consists of

NAS1149 + material code + Size and thickness code + finish code

 

Example:        NAS1149DN832K is an aluminum #8 washer,  .032” thick, anodized

         NAS1149F0332P is a Steel, 3/16 washer, .032” thick, Cad plated

 

NAS1149 continued

Bolt or screw size

 

 

Hole dia.

 

 

Outside diameter

 

 

 

Thickness

 

 

 

Steel

 

 

 

Stainless

 

 

Aluminum

K finish

 

 

Aluminum No finish

4

.125

.312

.016

.032

FN416P

FN432P

CN416R

CN432R

DN416K

DN432K

DN416H

DN432H

6

.140

.375

.016

.032

FN616P

FN632P

CN616R

CN632R

DN616K

DN632K

DN616H

DN632H

8

.174

.375

.016

.032

FN816P

FN832P

CN816R

CN832R

DN816K

DN832K

DN816H

DN832H

10

.203

.438

.016

.032

.063

F0316P

F0332P F0363P

C0316R

C0332R

C0363R

D0316K

D0332K D0363K

D0316H

D0332H D0363H

¼”

.265

.500

.016

.032

.063

F0416P

F0432P F0463P

C0416R

C0432R

C0463R

D0416K

D0432K D0463K

D0416H

D0432H D0463H

5/16”

.328

.562

.016

.032

.063

F0516P

F0532P F0563P

C0516R

C0532R

C0563R

D0516K

D0532K D0563K

D0516H

D0532H D0563H

3/8”

.390

.625

.016

.032

.063

F0616P

F0632P F0663P

C0616R

C0632R

C0663R

D0616K

D0632K D0663K

D0616H

D0632H D0663H

7/16”

.453

.750

.016

.032

.063

F0716P

F0732P F0763P

C0716R

C0732R

C0763R

D0716K

D0732K D0763K

D0716H

D0732H D0763H

½”

.515

.875

.016

.032

.063

F0816P

F0832P F0863P

C0816R

C0832R

C0863R

D0816K

D0832K D0863K

D0816H

D0832H D0863H

9/16”

.578

1.062

.016

.032

.063

F0916P

F0932P F0963P

C0916R

C0932R

C0963R

D0916K

D0932K D0963K

D0916H

D0932H D0963H

5/8”

.640

1.188

.016

.032

.063

F1016P

F1032P F1063P

C1016R

C1032R

C1063R

D1016K

D1032K D1063K

D1016H

D1032H D1063H

¾”

.765

1.312

.016

.032

.090

F1216P

F1232P F1290P

C1216R

C1232R

C1290R

D1216K

D1232K D1290K

D1216H

D1232H D1290H

 

 

AN960 to NAS1149 cross reference table

 

PART NUMBERS

Steel Washers

Stainless Steel Washers

AN960

PART NUMBER

NAS1149

PART NUMBER

AN960

PART NUMBER

NAS1149

PART NUMBER

AN960-4L

NAS1149FN416P

AN960C4L

NAS1149CN416R

AN960-4

NAS1149FN432P

AN960C4

NAS1149CN432R

AN960-5

NAS1149FN542P

AN960C5

NAS1149CN542R

AN960-6L

NAS1149FN616P

AN960C6L

NAS1149CN616R

AN960-6

NAS1149FN632P

AN960C6

NAS1149CN632R

AN960-8L

NAS1149FN816P

AN960C8L

NAS1149CN816R

AN960-8

NAS1149FN832P

AN960C8

NAS1149CN832R

AN960-9

NAS1149FN949P

AN960C9

NAS1149CN949R

AN960-10L

NAS1149F0332P

AN960C10L

NAS1149C0332R

AN960-10

NAS1149F0363P

AN960C10

NAS1149C0363R

AN960-11

NAS1149F1165P

AN960C11

NAS1149C1165R

AN960-416L

NAS1149F0432P

AN960C416L

NAS1149C0432R

AN960-416

NAS1149F0463P

AN960C416

NAS1149C0463R

AN960-516L

NAS1149F0532P

AN960C516L

NAS1149C0532R

AN960-516

NAS1149F0563P

AN960C516

NAS1149C0563R

AN960-616LL

NAS1149F0616P

AN960C616LL

NAS1149C0616R

AN960-616L

NAS1149F0632P

AN960C616L

NAS1149C0632R

AN960-616

NAS1149F0663P

AN960C616

NAS1149C0663R

AN960-716L

NAS1149F0732P

AN960C716L

NAS1149C0732R

AN960-716

NAS1149F0763P

AN960C716

NAS1149C0763R

AN960-816L

NAS1149F0832P

AN960C816L

NAS1149C0832R

AN960-816

NAS1149F0863P

AN960C816

NAS1149C0863R

AN960-916L

NAS1149F0932P

AN960C916L

NAS1149C0932R

AN960-916

NAS1149F0963P

AN960C916

NAS1149C0963R

AN960-1016L

NAS1149F1032P

AN960C1016L

NAS1149C1032R

AN960-1016

NAS1149F1063P

AN960C1016

NAS1149C1063R

AN960-1216L

NAS1149F1232P

AN960C1216L

NAS1149C1232R

AN960-1216

NAS1149F1290P

AN960C1216

NAS1149C1290R

 

AN960 to NAS1149 cross reference table (continued)

PART NUMBERS

Aluminum Washer K finish

Aluminum Washer P finish

AN960

PART NUMBER

NAS1149

PART NUMBER

AN960

PART NUMBER

NAS1149

PART NUMBER

AN960KD4L

NAS1149DN416K

AN960PD4L

NAS1149DN416J

AN960KD4

NAS1149DN432K

AN960PD4

NAS1149DN432J

AN960KD5

NAS1149DN542K

AN960PD5

NAS1149DN542J

AN960KD6L

NAS1149DN616K

AN960PD6L

NAS1149DN616J

AN960KD6

NAS1149DN632K

AN960PD6

NAS1149DN632J

AN960KD8L

NAS1149DN816K

AN960PD8L

NAS1149DN816J

AN960KD8

NAS1149DN832K

AN960PD8

NAS1149DN832J

AN960KD9

NAS1149DN949K

AN960PD9

NAS1149DN949J

AN960KD10LL

NAS1149D0316K

AN960PD10L

NAS1149D0316J

AN960KD10L

NAS1149D0332K

AN960PD10

NAS1149D0363J

AN960KD10

NAS1149D0363K

AN960PD11

NAS1149D1165J

AN960KD11

NAS1149D1165K

AN960PD416L

NAS1149D0416J

AN960KD416L

NAS1149D0416K

AN960PD416

NAS1149D0463J

AN960KD416

NAS1149D0463K

AN960PD516L

NAS1149D0516J

AN960KD516L

NAS1149D0516K

AN960PD516

NAS1149D0563J

AN960KD516

NAS1149D0563K

AN960PD616L

NAS1149D0616J

AN960KD616L

NAS1149D0616K

AN960PD616

NAS1149D0663J

AN960KD616

NAS1149D0663K

AN960PD716L

NAS1149D0716J

AN960KD716L

NAS1149D0716K

AN960PD716

NAS1149D0763J

AN960KD716

NAS1149D0763K

AN960PD816L

NAS1149D0816J

AN960KD816L

NAS1149D0816K

AN960PD816

NAS1149D0863J

AN960KD816

NAS1149D0863K

AN960PD916L

NAS1149D0916J

AN960KD916L

NAS1149D0916K

AN960PD916

NAS1149D0963J

AN960KD916

NAS1149D0963K

AN960PD1016L

NAS1149D1016J

AN960KD1016L

NAS1149D1016K

AN960PD1016

NAS1149D1063J

AN960KD1016

NAS1149D1063K

AN960PD1216L

NAS1149D1216J

AN960KD1216L

NAS1149D1216K

AN960PD1216

NAS1149D1290J

AN960KD1216

NAS1149D1290K

AN960PD4L

NAS1149DN416J

 

 

AN960 to NAS1149 cross reference table (continued)

Aluminum Washer D finish (no finish)

AN960

PART NUMBER

NAS1149

PART NUMBER

AN960D4L

NAS1149DN416H

AN960D4

NAS1149DN432H

AN960D5

NAS1149DN542H

AN960D6L

NAS1149DN616H

AN960D6

NAS1149DN632H

AN960D8L

NAS1149DN816H

AN960D8

NAS1149DN832H

AN960D9

NAS1149DN949H

AN960D10L

NAS1149D0316H

AN960D10

NAS1149D0363H

AN960D11

NAS1149D1165H

AN960D416L

NAS1149D0416H

AN960D416

NAS1149D0463H

AN960D516L

NAS1149D0516H

AN960D516

NAS1149D0563H

AN960D616L

NAS1149D0616H

AN960D616

NAS1149D0663H

AN960D716L

NAS1149D0716H

AN960D716

NAS1149D0763H

AN960D816L

NAS1149D0816H

AN960D816

NAS1149D0863H

AN960D916L

NAS1149D0916H

AN960D916

NAS1149D0963H

AN960D1016L

NAS1149D1016H

AN960D1016

NAS1149D1063H

AN960D1216L

NAS1149D1216H

AN960D1216

NAS1149D1290H

AN960D4L

NAS1149DN416H

 

 

 

NAS1169 Finishing washer 100 degree countersink (dimpled)

These washers are used mainly in fiberglass or thin material with countersunk screws.  Requires oversized hole/countersunk hole in material.

 

Available in cad plated steel or stainless steel

 

Aircraft Spruce uses their own numbers which are a commercial equivelant

 

Current spec: NAS1169

 

Common sizes

Bolt size

OD

Height

Thickness

Steel

Stainless Steel

Aircraft Spruce (stainless)

6 (.138)

.475

.076

.082

.016

.025

-6L

-6

-C6L

-C6

04-00397

8 (.164)

.562

.087

.094

.016

.025

-8L

-8

-C8L

-C8

04-00392

10 (.190)

.625

.099

.101

.016

.025

-10L

-10

-C10L

-C10

04-00398

1/4

.750

.125

.132

.016

.025

-416L

-416

-C416L

-C416