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Aftermarket Thermo King® Hardware Parts for Reefers & APUs

Thermo Engine Supply stocks application-specific hardware for Thermo King® transport refrigeration units — bolts, screws, nuts, pins, keys, plugs, rings, seals, spacers, and washers. Each part is identified by part number and matched to the exact dimensions, thread specs, and material requirements of engine, compressor, and refrigeration assemblies. All components are aftermarket replacements. Thermo Engine Supply is not an authorized Thermo King® dealer.

Browse by category below or search by part number. Call (800) 966-3105 for fitment assistance.

Hardware Types

Transport refrigeration units require different fasteners depending on the component and service location. Oil sump assemblies use specific bolt sizes and thread patterns to maintain oil pressure. Drive couplings require high-strength cap screws rated for continuous vibration loads. Fuel injection pumps rely on sealing washers that hold under high fuel pressure. 

Bolts & Screws

Thermo Engine Supply stocks cap screws, hex head bolts, flange bolts, and socket head cap screws in metric and imperial thread standards. Application-specific items include oil sump bolts, oil pump housing and cover bolts, drive coupling bolts, and piston head nuts. Grade markings on bolt heads indicate tensile strength. Compressor mounting and drivetrain applications require Grade 8 or metric 10.9 equivalents to prevent bolt failure and equipment damage.

Washers & Seals

Sealing washers are stocked in copper, nylon, and steel to match the sealing requirements of different assemblies. Copper sealing rings provide high-temperature resistance for injection pump applications and deform under compression to create leak-proof joints. Nylon sealing rings work in lower-pressure refrigeration circuits where chemical compatibility with refrigerant oils is required. Steel flat washers and lock washers support structural fastening where vibration resistance is the priority. Always replace sealing washers during reassembly — reusing compressed seals can cause refrigerant leaks or fuel system failures.

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WASHER, 5/16 SPLIT LOCK

Part #: 10-55-211W

$1.00

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WASHER, SPLIT

Part #: 10-55-7112

$7.50

WASHER, SIGHT GLASS

Part #: 10-55-370

$1.25

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WASHER, PISTON HEAD

Part #: 10-55-895P

$1.00

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LOCK WASHER, BRACKET

Part #: 10-55-366

$1.00

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NUT, PISTON HEAD, 5/16-24 THREAD

Part #: 10-55-318

$1.00

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BOLT, 3/8-16 THREAD X 1 LENGTH, COVER PLATE

Part #: 10-55-529

$2.00

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BOLT, TUBE BRACKET

Part #: 10-55-165

$1.00

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BOLT, OIL SUMP

Part #: 10-55-1417

$1.50

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NUT, CLAMP OIL SCREEN

Part #: 10-55-291

$1.00

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SCREW, HEX HEAD 3/8-16 THREAD X 3-1/2 LENGTH

Part #: 10-55-926

$4.00

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BOLT, SEAL PLATE

Part #: 10-55-2381

$1.00

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PLUG, CYLINDER HEAD

Part #: 10-55-3364

$2.25

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PIN, COTTER

Part #: 10-55-585

$1.00

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DOWEL PIN, 3/16 X 1/2 INCH

Part #: 10-55-4210

$1.00

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BOLT, OIL DRAIN, 3/8-16 THREAD X 3/4 LENGTH

Part #: 10-55-329

$1.00

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BOLT, 5/16-18 THREAD X 3/4 LENGTH

Part #: 10-55-211B

$1.25

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BOLT, STRUT-GAS

Part #: 10-55-9441

$7.50

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BOLT, 3/8 X 16 THREAD X 5.5 LENGTH, SEIZED ZINC PLATED

Part #: 10-51-575

$1.25

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SCREW, 12 MILLIMETERS

Part #: 10-55-4666

$1.25

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SCREW, 20 MILLIMETERS

Part #: 10-51-2759

$1.75

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PLUG, HEX HEAD 9/16-18 BRASS

Part #: 10-55-8398

$19.50

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DOWEL PIN, 3/16 X 5/8 INCH

Part #: 10-55-4211

$1.00

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DOWEL PIN, 2.25 INCHES

Part #: 10-51-817

$10.50

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BOLT, OIL PUMP HOUSING

Part #: 10-55-183

$1.00

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SPIRAL RING

Part #: 10-55-4702

$7.75

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BOLT, PUMP COVER

Part #: 10-55-681

$1.00

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PLUG, OIL FILL

Part #: 10-55-6750

$9.75

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WASHER, COPPER

Part #: 10-55-386

$1.00

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WASHER, PIPE JOINT

Part #: 10-55-1922

$4.00

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KEY, CRANKSHAFT, X214

Part #: 10-55-455

$2.75

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BOLT M12-1.75 X 90MM, DULL FINISH

Part #: 10-51-220

$7.25

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DOWEL PIN ALLOY BLACK OXIDE 2 X 0.5

Part #: 10-51-814

$6.25

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SEALING RING, COPPER

Part #: 10-55-2208

$1.25

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WASHER, SEALING, NYLON FOR INJECTION PUMP

Part #: 10-55-8620

$5.50

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BOLT, DRIVE COUPLING STANDARD

Part #: 10-55-4316

$2.25

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FASTENER

Part #: 10-55-3369

$9.50

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NUT, SPEED

Part #: 10-55-4318

$4.25

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BOLT, DRIVE COUPLING LARGE SHAFT

Part #: 10-55-9031

$9.00

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KEY, CRANKSHAFT 5/8 INCH LARGE SHAFT

Part #: 10-55-9032

$5.00

KEY

Part #: 10-55-457

$2.00

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KEY, CRANKSHAFT

Part #: 10-55-9024

$5.50

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WASHER, STEEL

Part #: 10-55-896

$0.50

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PLUG, OIL PUMP COVER

Part #: 10-55-6752

$8.75

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BOLT, EYE

Part #: 10-55-2762

$9.00

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WASHER, STEEL

Part #: 10-55-895

$1.00

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PLUG, OIL DRAIN (MAGNETIC)

Part #: 10-55-6751

$15.25