Top 100 Contractors in NAICS 333612: Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 333612: Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 79% of FY2021 NAICS 333612 contract dollars

Contract obligations: $117,012,067 Net of deobligations, by contracts coded NAICS 333612
Contractors: 405 Parent companies with an obligation
Largest contractor: The Timken Company $78.9 million, 65.2% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	The Timken Company 5 awardees, including Timken Gears & Services Inc. and Cone Drive Operations Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Army (Department of the Army)	$78,948,730	65.2%	Rank history: #1 in FY2022, #1 in FY2023, #73 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	Honeywell International Inc. 3 awardees Top agencies DLA (Defense Logistics Agency)	$5,448,946	4.5%	Rank history: #2 in FY2022, #5 in FY2023, not on the FY2024 list and #53 in FY2025; unchanged since FY2020.
3	The Charles Schillinger Co., Inc. Top agencies Army (Department of the Army)	$1,937,883	1.6%	Rank history: #8 in FY2022, not on the FY2023 list, #19 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
4	Tecmotiv Corporation Through Tecmotiv (Usa), Inc. Top agencies Army (Department of the Army)	$1,895,750	1.6%	Rank history: not on the FY2022 list, #85 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
5	Renk Systems Corporation Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$1,717,123	1.4%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
6	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,306,178	1.1%	Rank history: #7 in FY2022, #4 in FY2023, #4 in FY2024 and #2 in FY2025; up 3 since FY2020.
7	Bollinger Shipyards Inc Through Chand, L.L.C. Top agencies DLA (Defense Logistics Agency)	$1,291,750	1.1%	Rank history: #33 in FY2022, #9 in FY2023, #83 in FY2024 and not on the FY2025 list; up 189 since FY2020.
8	Transaero, Inc. Top agencies DLA (Defense Logistics Agency)	$1,022,369	0.8%	Rank history: #13 in FY2022, #29 in FY2023, #37 in FY2024 and #14 in FY2025; down 4 since FY2020.
9	Signal Engineering Inc. Top agencies DLA (Defense Logistics Agency)	$863,099	0.7%	Rank history: #57 in FY2022, #32 in FY2023, #56 in FY2024 and #32 in FY2025; up 8 since FY2020.
10	PSI Holding Co Through Peaker Services Inc. Top agencies DLA (Defense Logistics Agency)	$737,327	0.6%	Rank history: #48 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
11	SSS Clutch Co, Inc. Top agencies Navy (Department of the Navy)	$701,190	0.6%	Rank history: #14 in FY2022, not on the FY2023 list, #74 in FY2024 and not on the FY2025 list; up 278 since FY2020.
12	Wisconsin Ordnance Works Ltd Top agencies DLA (Defense Logistics Agency)	$580,769	0.5%	Rank history: #59 in FY2022, #28 in FY2023, #7 in FY2024 and #5 in FY2025; down 4 since FY2020.
13	JA Moody LLC 2 awardees, including ESI Acquisition Corp Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$538,346	0.4%	Rank history: #15 in FY2022, #99 in FY2023, #30 in FY2024 and not on the FY2025 list; up 44 since FY2020.
14	Seyer Industries, Inc. Top agencies Navy (Department of the Navy)	$529,266	0.4%	Rank history: not on the FY2022 list, #33 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
15	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$527,180	0.4%	Rank history: #30 in FY2022, #65 in FY2023, #17 in FY2024 and #44 in FY2025; down 3 since FY2020.
16	Hunter Defense Technolog Through HDT Expeditionary Systems Inc. Top agencies DLA (Defense Logistics Agency)	$523,740	0.4%	Rank history: not on the FY2022–FY2025 lists; up 48 since FY2020.
17	Clifton Corporation The Top agencies Army (Department of the Army)	$476,385	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Jamaica Bearings Co., Inc. 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$475,480	0.4%	Rank history: #26 in FY2022, #51 in FY2023, #6 in FY2024 and #43 in FY2025; up 11 since FY2020.
19	Dreamfind, Inc. Top agencies DLA (Defense Logistics Agency)	$471,288	0.4%	Rank history: #18 in FY2022, #7 in FY2023, #16 in FY2024 and #41 in FY2025; up 1 since FY2020.
20	Ohio Machinery Co Top agencies DLA (Defense Logistics Agency)	$461,423	0.4%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
21	Steward Machine Co Inc. Top agencies Army (Department of the Army)	$398,015	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
22	S I T Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$397,105	0.3%	Rank history: #38 in FY2022, #79 in FY2023, #49 in FY2024 and #26 in FY2025; up 14 since FY2020.
23	Black Bay Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$379,100	0.3%	Rank history: not on the FY2022–FY2023 lists, #80 in FY2024 and not on the FY2025 list; up 206 since FY2020.
24	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$378,756	0.3%	Rank history: #27 in FY2022, #10 in FY2023, #10 in FY2024 and #3 in FY2025; down 8 since FY2020.
25	Heroux-Devtek Inc. Through Beaver Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency)	$357,985	0.3%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
26	Curtiss-Wright Corporation 3 awardees, including Exlar Corporation and Curtiss-Wright Controls, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$337,800	0.3%	Rank history: #3 in FY2022, not on the FY2023–FY2024 lists and #50 in FY2025; up 55 since FY2020.
27	The Belting Company of Cincinnati Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$318,269	0.3%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
28	Donald E. Harman Co Top agencies DLA (Defense Logistics Agency)	$275,582	0.2%	Rank history: not on the FY2022 list, #64 in FY2023 and not on the FY2024–FY2025 lists; up 114 since FY2020.
29	Dutch Valley Supply Co. Top agencies Navy (Department of the Navy)	$266,989	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	Transdigm Group Incorporated 3 awardees, including Skurka Aerospace Inc. and Duke's Aerospace, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$254,913	0.2%	Rank history: #20 in FY2022, not on the FY2023 list, #40 in FY2024 and not on the FY2025 list; up 54 since FY2020.
31	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$249,389	0.2%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
32	Jo-Kell Inc. Top agencies DLA (Defense Logistics Agency)	$247,864	0.2%	Rank history: #17 in FY2022, #42 in FY2023, #84 in FY2024 and #10 in FY2025; up 58 since FY2020.
33	Atech Inc. Top agencies DLA (Defense Logistics Agency)	$243,310	0.2%	Rank history: not on the FY2022–FY2025 lists; up 88 since FY2020.
34	Broadwind Energy Inc. Through Brad Foote Gear Works, Inc. Top agencies Army (Department of the Army)	$230,323	0.2%	Rank history: not on the FY2022–FY2023 lists, #77 in FY2024 and not on the FY2025 list; up 188 since FY2020.
35	Applied Industrial Technologies, Inc. 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$225,510	0.2%	Rank history: #62 in FY2022, #55 in FY2023, not on the FY2024 list and #30 in FY2025; up 141 since FY2020.
36	General Dynamics Corporation 4 awardees, including General Dynamics Land Systems - Canada Corporation, General Dynamics-Ots, Inc. and Electric Boat Corporation Top agencies DLA (Defense Logistics Agency)	$219,183	0.2%	Rank history: #10 in FY2022, #8 in FY2023, #76 in FY2024 and #39 in FY2025; down 22 since FY2020.
37	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$206,594	0.2%	Rank history: #23 in FY2022, #22 in FY2023, #3 in FY2024 and #7 in FY2025; down 4 since FY2020.
38	Kop Flex Top agencies Navy (Department of the Navy)	$204,884	0.2%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; up 189 since FY2020.
39	Norfolk Bearings & Supply Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$200,707	0.2%	Rank history: not on the FY2022 list, #61 in FY2023, #99 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
40	Houston Drive Train Vehicle Component Sales, Inc. Top agencies DLA (Defense Logistics Agency)	$198,665	0.2%	Rank history: not on the FY2022–FY2025 lists; up 216 since FY2020.
41	Vertex LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$196,915	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Lynn Electronics LLC Top agencies DLA (Defense Logistics Agency)	$195,377	0.2%	Rank history: #35 in FY2022 and not on the FY2023–FY2025 lists; up 62 since FY2020.
43	All-Safe Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$186,264	0.2%	Rank history: #89 in FY2022, not on the FY2023–FY2024 lists and #45 in FY2025; up 123 since FY2020.
44	MDF Technologies Inc. Top agencies DLA (Defense Logistics Agency)	$183,000	0.2%	Rank history: #70 in FY2022, #26 in FY2023, #91 in FY2024 and #68 in FY2025; down 1 since FY2020.
45	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$181,959	0.2%	Rank history: #11 in FY2022, #11 in FY2023, #45 in FY2024 and #12 in FY2025; down 3 since FY2020.
46	The Rowland Company Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$178,396	0.1%	Rank history: not on the FY2022–FY2025 lists; up 169 since FY2020.
47	Wartsila Defense Inc. Through Defense Maritime Solutions, Inc. Top agencies Navy (Department of the Navy)	$172,406	0.1%	Rank history: #65 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
48	OLB Associates LLC Top agencies DLA (Defense Logistics Agency)	$171,335	0.1%	Rank history: not on the FY2022–FY2025 lists; up 198 since FY2020.
49	Bolder Capital LLC Through The Horsburgh & Scott Co Top agencies Army (Department of the Army)	$167,085	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Atlanta Gear Works, LLC Top agencies Army (Department of the Army)	$166,535	0.1%	Rank history: not on the FY2022–FY2025 lists; down 40 since FY2020.
51	Norcatec LLC 2 awardees Top agencies DLA (Defense Logistics Agency)	$163,382	0.1%	Rank history: #100 in FY2022, #73 in FY2023, #96 in FY2024 and #33 in FY2025; up 162 since FY2020.
52	Unimex Corporation Through Paragon Defense Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$161,950	0.1%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
53	Aero Precision Industries LLC Through Allclear Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency)	$147,099	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Cotta Transmission Co LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$144,941	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	General Reliance Corp Top agencies DLA (Defense Logistics Agency)	$144,181	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Melton Sales & Service Top agencies DLA (Defense Logistics Agency)	$142,632	0.1%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
57	Bhayana Brothers LLC Top agencies Army (Department of the Army)	$141,249	0.1%	Rank history: #19 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
58	Triumph Group, Inc. Through Triumph Gear Systems - Macomb, LLC Top agencies Army (Department of the Army)	$141,225	0.1%	Rank history: not on the FY2022 list, #37 in FY2023 and not on the FY2024–FY2025 lists; up 119 since FY2020.
59	Curtis Machine Company, Inc. Top agencies DLA (Defense Logistics Agency)	$132,727	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	V. Lopez JR. & Sons General Engineering Contractors, Inc. Top agencies DLA (Defense Logistics Agency)	$129,793	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Westsim Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$128,418	0.1%	Rank history: #74 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; up 127 since FY2020.
62	VSE Corporation 2 awardees, including Wheeler Fleet Solutions, Co. Top agencies DLA (Defense Logistics Agency)	$127,324	0.1%	Rank history: not on the FY2022 list, #52 in FY2023 and not on the FY2024–FY2025 lists; up 195 since FY2020.
63	Statz Corp Top agencies DLA (Defense Logistics Agency)	$125,801	0.1%	Rank history: #67 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
64	Air Industries Group Through Nassau Tool Works, Inc. Top agencies DLA (Defense Logistics Agency)	$124,942	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Integrated Procurement Technologies Top agencies DLA (Defense Logistics Agency)	$123,959	0.1%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; up 183 since FY2020.
66	Polytech Defense Spares LLC Top agencies DLA (Defense Logistics Agency)	$122,054	0.1%	Rank history: #76 in FY2022, #72 in FY2023, not on the FY2024 list and #86 in FY2025; down 11 since FY2020.
67	Midway Industrial Supply Inc. Top agencies DLA (Defense Logistics Agency)	$119,855	0.1%	Rank history: #21 in FY2022, not on the FY2023 list, #54 in FY2024 and #63 in FY2025; up 32 since FY2020.
68	FBC Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$116,831	0.1%	Rank history: #25 in FY2022, not on the FY2023–FY2024 lists and #16 in FY2025; new, not ranked in FY2020.
69	DC Precision LLC Top agencies DLA (Defense Logistics Agency)	$115,639	0.1%	Rank history: #60 in FY2022, not on the FY2023 list, #93 in FY2024 and #69 in FY2025; new, not ranked in FY2020.
70	American Veteran Industries, LLC Top agencies DLA (Defense Logistics Agency)	$111,948	0.1%	Rank history: not on the FY2022–FY2025 lists; up 50 since FY2020.
71	General Metals Powder Co Top agencies DLA (Defense Logistics Agency)	$108,261	0.1%	Rank history: #77 in FY2022, #68 in FY2023, #70 in FY2024 and #96 in FY2025; down 17 since FY2020.
72	Jag Components, LLC Top agencies DLA (Defense Logistics Agency)	$105,646	0.1%	Rank history: #36 in FY2022, not on the FY2023 list, #92 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
73	Global Logistics Strategies Inc. Top agencies DLA (Defense Logistics Agency)	$105,568	0.1%	Rank history: not on the FY2022 list, #58 in FY2023, #29 in FY2024 and #31 in FY2025; down 15 since FY2020.
74	AVL Technologies Inc. Top agencies Army (Department of the Army)	$104,463	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Derbyshire Machine & Tool Co Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$102,056	0.1%	Rank history: #24 in FY2022, #25 in FY2023, #34 in FY2024 and not on the FY2025 list; up 31 since FY2020.
76	Dela Technology Corporation Top agencies DLA (Defense Logistics Agency)	$99,995	0.1%	Rank history: not on the FY2022–FY2023 lists, #35 in FY2024 and not on the FY2025 list; up 31 since FY2020.
77	Jered LLC Top agencies DLA (Defense Logistics Agency)	$97,982	0.1%	Rank history: #99 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 86 since FY2020.
78	Wittenstein Inc. Top agencies NASA (National Aeronautics and Space Administration)	$97,982	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	Martin Military Inc. Top agencies DLA (Defense Logistics Agency)	$96,717	0.1%	Rank history: #47 in FY2022, #31 in FY2023, #33 in FY2024 and not on the FY2025 list; unchanged since FY2020.
80	Abstract Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$94,133	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Northrop Grumman Corporation 3 awardees, including Northrop Grumman Systems Corporation and Alliant Techsystems Operations LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$89,736	0.1%	Rank history: not on the FY2022–FY2023 lists, #13 in FY2024 and not on the FY2025 list; down 78 since FY2020.
82	Southern Gear & Machine Inc. Top agencies DLA (Defense Logistics Agency)	$89,410	0.1%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
83	Delta Research, LLC Through Delta Gear, Llc. Top agencies Navy (Department of the Navy)	$88,900	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Kingsbury Inc. Top agencies Navy (Department of the Navy)	$87,870	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	General Aviation Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$82,441	0.1%	Rank history: not on the FY2022 list, #66 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
86	L3Harris Technologies, Inc. 4 awardees, including CAE USA Inc., L3 Technologies, Inc. and L3Harris Maritime Power & Energy Solutions, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$82,050	0.1%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; down 16 since FY2020.
87	Mcguire Bearing Company Top agencies Navy (Department of the Navy)	$79,395	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Lee Precision Machine Shop Inc. Top agencies DLA (Defense Logistics Agency)	$77,048	0.1%	Rank history: not on the FY2022–FY2023 lists, #68 in FY2024 and not on the FY2025 list; up 37 since FY2020.
89	Par Defense Industries, LLC Top agencies DLA (Defense Logistics Agency)	$76,213	0.1%	Rank history: not on the FY2022–FY2025 lists; up 81 since FY2020.
90	Lake Shore Systems, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$74,801	0.1%	Rank history: #78 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; down 69 since FY2020.
91	TEK Precision Co Limited Top agencies Navy (Department of the Navy)	$74,540	0.1%	Rank history: #95 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
92	RIX Industries Top agencies DLA (Defense Logistics Agency)	$74,490	0.1%	Rank history: #69 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
93	ECI Defense Group, Inc. Top agencies DLA (Defense Logistics Agency)	$73,991	0.1%	Rank history: not on the FY2022–FY2024 lists and #11 in FY2025; new, not ranked in FY2020.
94	Gateway Engineering Inc. Top agencies Navy (Department of the Navy)	$73,000	0.1%	Rank history: not on the FY2022–FY2025 lists; down 34 since FY2020.
95	Tork Systems Inc. Top agencies Navy (Department of the Navy)	$71,566	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Oshkosh Corp 2 awardees, including Oshkosh Defense LLC and JLG Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$70,838	0.1%	Rank history: not on the FY2022 list, #97 in FY2023 and not on the FY2024–FY2025 lists; down 57 since FY2020.
97	Hydraulics International, Inc. Top agencies DLA (Defense Logistics Agency)	$68,680	0.1%	Rank history: not on the FY2022–FY2025 lists; down 45 since FY2020.
98	U.s.a. Spares Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$67,410	0.1%	Rank history: #88 in FY2022, #60 in FY2023, #32 in FY2024 and #13 in FY2025; up 232 since FY2020.
99	Beta Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$67,025	0.1%	Rank history: not on the FY2022–FY2025 lists; up 91 since FY2020.
100	Koellmann Gear Corp Top agencies DOT (Department of Transportation)	$66,800	0.1%	Rank history: not on the FY2022 list, #67 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.

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100 of 405 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $121 million obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 333612 contractors in FY2021?

1. The Timken Company ($78.9M), 2. Honeywell International Inc. ($5.45M), 3. The Charles Schillinger Co., Inc. ($1.94M), 4. Tecmotiv Corporation ($1.9M), 5. Renk Systems Corporation ($1.72M), 6. Kampi Components Co Inc. ($1.31M), 7. Bollinger Shipyards Inc ($1.29M), 8. Transaero, Inc. ($1.02M), 9. Signal Engineering Inc. ($863K), 10. PSI Holding Co ($737K).

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