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Catalog › Parts manuals › TM 9-2320-280-24P › Winterization Kits › Fig. 390

HMMWV Step Assembly, Support Assembly, and Mounting Hardware TM 9-2320-280-24P · Fig. 390

Every part in figure 390 of TM 9-2320-280-24P (HMMWV M998 series (A0, A1 and A2) repair parts), group 3303 Winterization Kits: 15 lines, 7 on our own shelf in Augusta, GA. The rest we source — select what you need and send one quote request, answered within one business day.

TM 9-2320-280-24P figure 390, Step Assembly, Support Assembly, and Mounting Hardware: exploded drawing with item numbers

Drawing from TM 9-2320-280-24P, approved for public release. Open it full size to zoom.

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Item	Part	Qty	On our shelf
1	Bottom Support Assembly NSN 2540-01-317-0820 · P/N 12342332 SUPPORT ASSEMBLY,BO PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	1	We can source it $863.11 per assemblygov't list price
2	Cap Hexagon Head Screw NSN 5305-00-719-5221 · P/N B1821BH050F150N SCREW,CAP,HEXAGON H 1/2-20 X 1.50, PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	4	146 in stock
3	Flat Washer NSN 5310-00-809-5998 · P/N MS27183-18 WASHER,FLAT 1/2 PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	4	428 in stock $27.99our price Buy online ↗
4	Self-Locking Castellated Hex Nut NSN 5310-00-774-9073 · P/N 190171 NUT,SELF-LOCKING,CA 1/2-20 PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	4	We can source it
5	Self-Locking Hexagon Nut NSN 5310-00-814-0673 · P/N MS51943-33 NUT,SELF-LOCKING,HE 5/16-18 PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	2	354 in stock
6	Machine Bolt NSN 5306-00-226-4829 · P/N B1821BH031C125N BOLT,MACHINE 5/16-18 X 1.25 PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	2	74 in stock
7	Machine Screw NSN 5305-00-901-7250 · P/N MS24693-S350 SCREW,MACHINE 3/8-24 X 1.25,PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	2	We can source it $35–$75 eachtypical
8	Flat Washer NSN 5310-00-167-0821 · P/N M2025103 WASHER,FLAT 3/8,PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	4	106 in stock
9	Self-Locking Hexagon Nut NSN 5310-01-058-3353 · P/N 192481 NUT,SELF-LOCKING,HE 3/8-24,PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	4	We can source it
10	Vehicle Boarding Ladder NSN 2540-01-317-1024 · P/N 12342301 LADDER,VEHICLE BOAR PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	1	We can source it $1,009.78 per eachgov't list price
11	Straight Headed Pin NSN 5315-00-890-3461 · P/N MS20392-6C17 PIN,STRAIGHT,HEADER 7/16 X .531, PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	2	We can source it $25–$50 eachtypical
12	Mounting Plate NSN 5340-01-394-2409 · P/N 12342903 PLATE,MOUNTING PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	1	We can source it $176.44 per eachgov't list price
13	Wood Screw NSN 5305-00-902-6643 · P/N MS35492-76 SCREW,WOOD #10 X .75,PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	2	We can source it
14	Cotter Pin NSN 5315-00-842-3044 · P/N MS24665-283 PIN,COTTER 1/16,PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	2	3,000 in stock
15	Cap Hexagon Head Screw NSN 5305-00-269-3242 · P/N B1821BH038F200N SCREW,CAP,HEXAGON H 3/8-24 X 2.00, PART OF KIT P/N 5705611 Fits: M998, M998A1, M1038, M1038A1	2	45 in stock

Buy the 1 in-stock part on our store ↗

Qty is how many the assembly uses, as the manual lists it. Our price is our online store's price: Buy online opens that part on secoparts.net for card checkout. Typical is an estimate from the government catalog price and what we have charged for similar parts — not a quote. Gov't list price is the government catalog (FEDLOG) price, a public reference, not ours. "Fits" comes from the manual's usable-on codes; a line without codes applies to every model.