Locknuts
Locknuts, also known as a prevailing torque nuts, stiff nuts, or elastic stop nuts resist loosening caused by machine vibrations and torque. They are commonly used by machinists, engineers, and mechanics, and there are two general types of locknuts: prevailing torque and surface-bearing.
Prevailing Torque
Designed with a built-in locking feature that functions when it’s engaged with the bolt threads and then must be tightened with a wrench. Several of the locking techniques rely on distorted threads or a distorted shape to create an interference fit. Metal or nylon inserts can also be inserted to create the interference fit. A few common types of prevailing torque lock nuts include: 2-way reversible, flex-type, stover, all metal, and nylon insert.
Surface-Bearing
These are free spinning nuts that require tightening against a bearing surface in order for the locking mechanism to work. This type is not recommended for use on fragile parts. A few common types of free spinning lock nuts include: serrated flange, spring head, and KEPS (K-Lock)
Locknuts from AFT Fasteners are available in a wide range of diameters and materials including alloy steel, carbon steel and stainless steel with cadmium, phosphate and zinc finishes. Search our standard and metric locknuts, or contact us today for assistance finding the specific part you need. Our knowledgeable staff is here to help.
AFT Approved Vendor
1/4"-20 NE (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
3/8"-16 NE (Standard) Nylon Insert Locknuts, Coarse, Low Carbon, Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
#6-32 Locknut, Kep Hex Nut, Coarse, Stainless Steel A2 (18-8) (100/Pkg.)
AFT Approved Vendor
3/8"-16 Hex Flange Lock Nuts Serrated Coarse Case Hardened Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
5/16"-18 NE (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
1/4"-20 NE (Standard) Nylon Insert Locknuts, Coarse, Low Carbon, Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
3/8"-16 NE (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
5/16"-18 NE (Standard) Nylon Insert Locknuts, Coarse, Low Carbon, Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
#10-32 NM (Standard) Nylon Insert Locknut, Fine, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
5/16"-18 Hex Flange Lock Nuts Serrated Coarse Case Hardened Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
#10-24 NM (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
M6-1.00 Nylon Insert Locknut Class 10, DIN 985, Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
M5-0.80 DIN 985 Nylon Insert Locknuts Coarse A4-80 (100/Pkg.)
AFT Approved Vendor
#6-32 NM (Standard) Nylon Insert Locknuts, Coarse, Low Carbon, Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
1/2"-13 NE (Standard) Nylon Insert Locknuts, Coarse, Low Carbon, Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
#6-32 NM (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
1/4"-20 NE (Standard) Nylon Insert Locknut, Coarse, Stainless 316 (100/Pkg.)
AFT Approved Vendor
1/2"-13 NE (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
#8-32 NM (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
3/8"-16 NE (Standard) Nylon Insert Locknut, Coarse, Stainless 316 (100/Pkg.)
AFT Approved Vendor
1/4"-20 Hex Flange Lock Nuts Serrated 18-8 Stainless Steel (100/Pkg.)
AFT Approved Vendor
1/4"-20 Nylon-Insert Locknut, Grade C, Zinc-Yellow (100/Pkg.)
AFT Approved Vendor
1/4"-20 Hex Flange Lock Nuts Serrated Coarse Case Hardened Zinc Cr+3 (100/Pkg.)
AFT Approved Vendor
3/8"-16 Nylon-Insert Locknut, Grade C, Zinc-Yellow (100/Pkg.)
AFT Approved Vendor
3/8"-16 Hex Flange Lock Nuts Serrated Coarse Case Hardened Zinc Cr+3 (2000/Bulk Pkg.)
AFT Approved Vendor
M8-1.25 DIN 985 Nylon-Insert Locknut, Coarse, A2-70 (100/Pkg.)
AFT Approved Vendor
#4-40 NM (Standard) Nylon Insert Locknut, Coarse, Stainless A2 (18-8) (100/Pkg.)
AFT Approved Vendor
1/4"-20 Locknut, Kep Hex Nut, Coarse, Stainless Steel A2 (18-8) (100/Pkg.)
AFT Approved Vendor
1/2"-13 Hex Flange Lock Nuts Serrated Coarse Case Hardened Zinc Cr+3 (100/Pkg.)