WASHER, Lock, 7/16"
P/N: EC38
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| Approval | FAA PMA Sub-Component |
| Condition | New |
| Manufacturer | McFarlane Aviation |
| Unit of Measure | Each |
| Retail Price | $1.97 |
| Your Price | $1.72 Free Shipping on Orders over $500 |
| Stock Status | In Stock |
| Approval | FAA PMA Sub-Component |
| Condition | New |
| Manufacturer | McFarlane Aviation |
| Unit of Measure | Each |
| Retail Price | $1.97 |
| Your Price | $1.72 Free Shipping on Orders over $500 |
| Stock Status | In Stock |
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Eligible Aircraft
| Make | Series | Model | Beginning S/N | Ending S/N | Eligibility Chart |
|---|---|---|---|---|---|
| Many | Many | Many | 0 | ZZZZZZZZZZZZZZZ |
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Product Details
The retaining nut threads onto the threaded section of the control on the back side of the instrument panel to secure the control. Threaded wear sleeves are used on many McFarlane controls to secure the control to the firewall and/or mounting brackets. Replacement lock washer p/n EC38 for all McFarlane controls that attach to the instrument panel with a 7/16-20 thread (also used with 7/16-20 threaded wear sleeves on McFarlane controls).
Replacement Parts for McFarlane Push-Pull Controls
We offer a variety of replacement parts to service your McFarlane push-pull controls.
- Adjustable Friction Lock Service Kits
- Boots
- Knobs
- Retaining Nuts and Lock Washers
- Threaded Wear Sleeve Nuts and Lock Washers
- Miscellaneous
- Dual Throttle Hardware Kit P/N 6408
Adjustable Friction Lock Service Kits:
| Part Number | Description | Use Eligibility |
| EC12SK | Friction Packing Service Kit | Throttle controls using a 1/2" friction nut |
| EC312SK | Friction Packing Service Kit | Throttle controls using a 9/16" friction nut |
Boots: Fuel, oil and temperature resistant, keeps trash out of the control and dampens vibration.
| Part Number | Description | Use Eligibility |
| 235 | 3/16" Pushrod Boot | Controls with a 3/16" pushrod |
| 272 | 1/4" Pushrod Boot | Controls with a 1/4" pushrod |
| EC04 | Swivel Boot with Spring Lock | Controls employing a swivel joint |
| Part Number | Description | Use Eligibility* |
| 1536A or 1536B | T-Handle: B, C, GN, L, R, W, or Y | Various controls |
| 6277 | Round: R, B, L, or C | MCC1XXDLLL and MCUX24-LLL series controls |
| 6277 | Round, engraved with "CHOKE": RC, BC, LC, or CC |
MCC1XXDLLL series controls |
| 6277 | Round, engraved with "CABIN AIR": RA, BA, LA, or CA |
MCUX24-LLL series controls** |
| 6277 | Round, engraved with "DEFROST": RD, BD, LD, or CD |
MCUX24-LLL series controls** |
| 6277 | Round, engraved with "CABIN HEAT": RH, BH, LH, or CH |
MCUX24-LLL series controls** |
| 6277 | Round, engraved with "PARK BRAKE": RP, BP, LP, or CP |
MCUX24-LLL series controls** |
| 6307-BK | Round, Black | Various Cessna controls |
| 6307-RD | Round, Red | Various Cessna controls |
| 6378 | Fuel Strainer Drain | MCS1517 series controls |
| 6417 | T-Handle | MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6418 | T-Handle, Turn-to-Lock | MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6427 | 4 Prong | MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6428 | 4 Prong, Turn-to-Lock | MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6429 | Fluted | MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6430 | Fluted, Turn-to-Lock | MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6432 | T-Handle, Shortened | MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6489 | Square: R, B, L, or C | MCUX24-LLL series controls** |
| 6489 | Square, engraved with "CARB HEAT": RB, BB, LB, or CB |
MCUX24-LLL series controls** |
| 6495 | Phenolic, Black: -01B, -02B, -03B, -04R or -04B | MCUX24-LLL series controls** |
| 6512 | Triangle: R, B, L, or C | MCUX24-LLL series controls** |
| 6570 | Red Vernier-Assist Knob | Vernier-Assist Mixture controls |
| 6620 | 1/4-20 Black Vernier-Assist Knob | Vernier-Assist Throttle controls |
| 6660 | T-Handle, Turn-to-Lock, engraved with "Choke Lock" |
MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6661 | Fluted, Turn-to-Lock, engraved with "Cabin Heat Lock" |
MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6662 | Fluted, Turn-to-Lock, engraved with "Airbox Lock" |
MCTXXXX-LLL and MCTLXXX4DLLL series controls |
| 6730 | Prop, Vernier-Assist | MCVA Vernier-Assist controls |
| EC03 | 1/4-20 Black Knob | Throttle controls |
| EC125-1 | Hemisphere, Black | Throttle controls |
| EC53 | 1/4-20 Black Ball Knob | P/N MC12693-04 and MC455-139 MCT1XXDLLL, MCTLXXX4DLLL, MCTLXXXX-LLL and MCC1XXDLLL series controls |
**For all knob options for the MCUX24-LLL Universal Light-Weight Controls, go to Light-Weight Control Knob Options.
Retaining Nuts and Lock Washers: The retaining nut threads onto the threaded section of the control on the back side of the instrument panel to secure the control.
| Part Number | Description | Use Eligibility* |
| 6060-8 | 1/2-20 Retaining Nut | Throttle controls using 1/2-20 threaded fittings |
| EC111 | 1/2" Lock Washer | Throttle controls using 1/2" threaded fittings |
| EC119 | 3/4-16 Extended Panel Nut | Controls with a 3/4-16 thread |
| MS35333-40 | 1/4" Steel Lock Washer | MCT1XXDLLL, MCTLXXX4DLLL, MCTLXXXX-LLL, and MCC1XXDLLL series controls |
| MS35333-44 | 1/2" Lock Washer | |
| 6060-12 | 3/4-16 Retaining Nut | Throttle controls using 3/4-16 threaded fittings |
| EC112 | 3/4" Lock Washer | Throttle controls using 3/4" threaded fittings |
| MS35333-47 | 3/4" Lock Washer | |
| 6133 | 7/16-20 Retaining Nut | Throttle controls using 7/16-20 threaded fittings |
| 6196 | 3/4-24 Stainless Steel Jam Nut | MCUX24-LLL series controls |
| 6197 | 3/8" Lock Washer | MCUX24-LLL series controls |
| 6260 | 7/16-20 Retaining Nut, Modified | MC6350 dual push-to-unlock controls |
| EC38 | 7/16" Lock Washer | P/N MC565-548 series controls |
| EC61 | 3/8" Lock Washer | P/N MC12693-04 or MC455-139 |
| EC62 | 3/8-24 Stainless Steel Retaining Nut | P/N MC12693-04 or MC455-139 |
| EC65 | Throttle Spacer Bushing | P/N MC12693-04 or MC455-139 |
Threaded Wear Sleeve Nuts and Lock Washers: Threaded wear sleeves are used on many McFarlane controls to secure the control to the firewall and/or mounting brackets.
| Part Number | Description | Use Eligibility |
| EC33 | 1/4-20 Stainless Steel Jam Nut for Knobs | Throttle controls using 1/4-20 threaded fittings (except P/N MC12693-04 and MC455-139) |
| EC38 | 7/16" Lock Washer | P/N MC565-548 series controls |
| EC70 | 12M x 1.25 Jam Nut | P/N MC565 series controls |
| EC72 | 12mm Lock Washer | P/N MC565 series controls |
| Part Number | Description | Use Eligibility* |
| 6135 | 1/8" Ball Bearing | MC6150 and MC6250 push-to-unlock controls |
| 7391-0.300 | 3/8" Ball Bearing Halves | McFarlane Manufactured Beechcraft Controls |
| 6289 | Decal, "Carb Heat" | Piper carburetor heat controls |
| 6409 | 0.05 Allen Wrench | MCTL1014D series controls |
| 6290-06-12K | Panel Hole Reducer | Adapts a 0.375" control to a 0.75" hole |
| 6290-08-12K | Panel Hole Reducer | Adapts a 0.5" control to a 0.75" hole |
| 6416 | Pin, Turn-to-Lock | MCTLXXX4DLLL and MCTLXXXX-LLL series controls |
| 6420 | Ferrule, Turn-to-Lock, Brass | MCTLXXX4DLLL and MCTLXXXX-LLL series controls |
| 6423 | Ferrule, Turn-to-Lock, Nylon | MCTLXXX4DLLL and MCTLXXXX-LLL series controls |
| 6424 | Conduit Terminal | MCT1XXDLLL, MCTLXXX4DLLL, and MCC1XXDLLL series controls |
| 6433-1 | Conduit Clamp | MCQ1XXDLLL series controls |
| 6515 | Barrel Stop Assembly | MCTL1014D and MCC101D series controls |
| EC89 | Wedge Washer | Use on each side of instrument panel to angle a control |
| EC98 | 9/16" Friction Adjust Wheel | Throttle controls using a 9/16" friction nut |
| M83248/1-006 | O-ring | MCC1XXDLLL series controls |
| MS35650-304 | Jam Nut | MCC1XXDLLL series controls |
Dual Throttle Hardware Kit P/N 6408:
| Part Number | Description |
| 6408 | Kit contains the following: |
| 6271 | 2 each Slip Fit Conduit Terminal Assemblies |
| 6270 | 2 each Cable Stop Assemblies |
| 6822 | 1 each Spring, Red, Left |
| 7235 | 1 each Spring, Blue, Right |
| Hex Wrench | 1 each |
| Part Number | Description |
| XX | cable/wire type |
| LLL | part length |
| MCUX24-LLL | Universal Light-Weight Control |
| MCT1XXDLLL | Dual Throttle |
| MCTLXXX4DLLL | Dual Turn-to-Lock |
| MCTLXXXX-LLL | Single Turn-to-Lock |
| MCC1XXDLLL | Dual Control |
| MCQ1XXDLLL | Dual Quadrant Control |
Why choose McFarlane?
OUR PARTS ARE ENGINEERED TO LAST LONGER WHILE SOLVING KNOWN SAFETY ISSUES
OVER 40,000 PARTS IN STOCK WITH SAME DAY SHIPPING IF ORDERED BY 3PM
OUR TEAM PROVIDES THE OLD-FASHIONED CUSTOMER SERVICE THAT YOU EXPECT
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