Grade C Locknuts

Grade C locknuts, also known as Stover or Top-Lock nuts, are one-piece, all-metal locknuts. They feature a conical crown with slightly distorted elliptical threads that create a tight mechanical grip when torqued. The result is a vibration-resistant connection that holds under heavy loads. These Grade C locknuts are finished with a Clear Cr3 Zinc and Wax coating for improved corrosion resistance.
At Empire Bolt & Screw, we are a trusted national supplier of Grade C locknuts. We stock a wide range of sizes and materials to meet the needs of OEMs, MRO operations, and industrial distributors. Whatever your application, you can count on us to deliver superior-quality Grade C locknuts with fast turnaround and competitive prices.

Order Grade C Locknuts in Bulk or Custom Quantities Today

Browse the options below to order the Grade C Locknuts in the sizes and quantities you need. Questions? Contact us, and our team will assist you in finding the right fasteners for your application.

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Model	Product	Size	Plate	Pkg Qty
075110	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	1/4"-20	ZINC CR+3 & WAX	4,000	Add to Quote
075120	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	1/4"-28	ZINC CR+3 & WAX	4,000	Add to Quote
075130	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	5/16"-18	ZINC CR+3 & WAX	2,500	Add to Quote
075140	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	5/16"-24	ZINC CR+3 & WAX	2,500	Add to Quote
075150	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	3/8"-16	ZINC CR+3 & WAX	2,000	Add to Quote
075160	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	3/8"-24	ZINC CR+3 & WAX	2,000	Add to Quote
075170	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	7/16"-14	ZINC CR+3 & WAX	1,000	Add to Quote
075180	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	7/16"-20	ZINC CR+3 & WAX	1,000	Add to Quote
075190	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	1/2"-13	ZINC CR+3 & WAX	750	Add to Quote
075200	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	1/2"-20	ZINC CR+3 & WAX	750	Add to Quote
075210	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	9/16"-12	ZINC CR+3 & WAX	500	Add to Quote
075220	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	9/16"-18	ZINC CR+3 & WAX	500	Add to Quote
075230	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	5/8"-11	ZINC CR+3 & WAX	400	Add to Quote
075240	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	5/8"-18	ZINC CR+3 & WAX	400	Add to Quote
075250	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	3/4"-10	ZINC CR+3 & WAX	250	Add to Quote
075260	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	3/4"-16	ZINC CR+3 & WAX	250	Add to Quote
075270	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	7/8"-9	ZINC CR+3 & WAX	150	Add to Quote
075280	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	7/8"-14	ZINC CR+3 & WAX	150	Add to Quote
075290	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	1"-8	ZINC CR+3 & WAX	100	Add to Quote
075300	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	1"-14	ZINC CR+3 & WAX	100	Add to Quote
075301	1/2"-13 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	1/2"-13	ZINC CR+3 & WAX	0	Add to Quote
075302	1/4"-20 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	1/4"-20	ZINC CR+3 & WAX	0	Add to Quote
075303	3/4"-10 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	3/4"-10	ZINC CR+3 & WAX	0	Add to Quote
075304	3/8"-16 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	3/8"-16	ZINC CR+3 & WAX	0	Add to Quote
075305	5/8"-11 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	5/8"-11	ZINC CR+3 & WAX	0	Add to Quote
075306	5/16"-18 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	5/16"-18	ZINC CR+3 & WAX	0	Add to Quote
075307	1/2"-20 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	1/2"-20	ZINC CR+3 & WAX	0	Add to Quote
075308	1/4"-28 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	1/4"-28	ZINC CR+3 & WAX	0	Add to Quote
075309	3/4"-16 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	3/4"-16	ZINC CR+3 & WAX	0	Add to Quote
075310	3/8"-24 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	3/8"-24	ZINC CR+3 & WAX	0	Add to Quote
075311	5/8"-18 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	5/8"-18	ZINC CR+3 & WAX	0	Add to Quote
075312	5/16"-24 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	5/16"-24	ZINC CR+3 & WAX	0	Add to Quote
075313	7/16"-20 GR.C ALL METAL HEX LOCKNUTS ZINC & WAX CR+3 (TAIWAN)	7/16"-20	ZINC CR+3 & WAX	0	Add to Quote
075314	Grade C Hex All Metal Cone Locknut, Taiwan, Zinc/Wax CR+3 (Inch)	7/16"-14	ZINC CR+3 & WAX	1,000	Add to Quote
738062	M24-3.00 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M24-3.00	ZINC CR+3 & WAX	0	Add to Quote
738100	M5-0.80 CLASS 8 DIN 980 V / ISO 7042 AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M5-0.80	ZINC CR+3 & WAX	0	Add to Quote
738110	M6-1.00 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M6-1.00	ZINC CR+3 & WAX	0	Add to Quote
738130	M8-1.25 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M8-1.25	ZINC CR+3 & WAX	0	Add to Quote
738150	M10-1.50 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M10-1.50	ZINC CR+3 & WAX	0	Add to Quote
738170	M12-1.75 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M12-1.75	ZINC CR+3 & WAX	0	Add to Quote
738190	M14-2.00 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M14-2.00	ZINC CR+3 & WAX	0	Add to Quote
738210	M16-2.00 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M16-2.00	ZINC CR+3 & WAX	0	Add to Quote
738230	M20-2.50 CLASS 8 DIN 980 V AUTOMATION LOCKNUT ZINC CR+3 & WAXED	M20-2.50	ZINC CR+3 & WAX	0	Add to Quote
825110	1/4"-20 ALL METAL HEX LOCKNUTS GRADE C MED. CARBON ZINC & WAX CR+3	1/4"-20	ZINC CR+3 & WAX	0	Add to Quote
825120	1/4"-28 ALL METAL HEX LOCKNUTS GRADE C MED. CARBON ZINC & WAX CR+3	1/4"-28	ZINC CR+3 & WAX	0	Add to Quote
825130	5/16"-18 ALL METAL HEX LOCKNUTS GRADE C MED. CARBON ZINC & WAX CR+3	5/16"-18	ZINC CR+3 & WAX	0	Add to Quote
825140	5/16"-24 ALL METAL HEX LOCKNUTS GRADE C MED. CARBON ZINC & WAX CR+3	5/16"-24	ZINC CR+3 & WAX	0	Add to Quote
825150	3/8"-16 ALL METAL HEX LOCKNUTS GRADE C MED. CARBON ZINC & WAX CR+3	3/8"-16	ZINC CR+3 & WAX	0	Add to Quote
825160	3/8"-24 ALL METAL HEX LOCKNUTS GRADE C MED. CARBON ZINC & WAX CR+3	3/8"-24	ZINC CR+3 & WAX	0	Add to Quote
825170	7/16"-14 ALL METAL HEX LOCKNUTS GRADE C MED. CARBON ZINC & WAX CR+3	7/16"-14	ZINC CR+3 & WAX	0	Add to Quote

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Key Benefits of Grade C Locknuts

Features a distorted thread form that resists vibration and loosening
The one-piece, all-metal construction handles heavy loads for long-lasting strength
Maintains clamp load under high stress
Can be reused in certain non-critical applications
Available in a full range of sizing options

Industrial Applications and Industries That Use Grade C Locknuts

Grade C locknuts are used in a wide range of industrial applications that require vibration-resistant fastening. The strength provided by their all-metal construction makes them more durable than other locknut options. Common applications for Grade C locknuts include:

Heavy equipment and industrial machinery
Construction and infrastructure projects
Agricultural equipment
Material handling equipment
Automotive and truck components
Power generation systems

Your Source for Grade C Locknuts and Industrial Fastening Solutions

At Empire Bolt & Screw, we are dedicated to providing industrial professionals nationwide with top-quality fastening solutions. We offer engineering support, quality control, and supply chain expertise to meet your industrial fastening requirements. With custom Vendor Managed Inventory, Kanban, and Just-In-Time programs, we can help you minimize downtime by streamlining your fastener inventory supply processes, keeping you fully stocked with products like Grade C locknuts.

Contact Us Today to Get Grade C Locknuts at Great Prices

Request a quote today or contact our office to discuss your Grade C locknut requirements. Looking for other locknuts? Check out our inventory of nylon insert locknuts, slotted and castle nuts, and custom options. Empire Bolt & Screw is your one-stop supplier for Grade C locknuts.