Lock Nuts

Lock nuts are threaded fasteners used to secure compatible connections in commercial maintenance, assembly, and building work. This category includes nylon insert lock nuts for threaded assemblies, slotted spanner lock nuts for secured adjustments and setting applications, and external-tooth lock nuts for 10-32 connections. Related threaded fastening options represented include four-prong T-nuts and machine screws for matching fastening work.

Product Display:
Helpful Buying Guide

Choose Lock Nuts by Thread, Locking Style, and Application

Start with the exact thread required by the mating component, then select the lock nut style that fits the installation or adjustment task. The products represented span metric and UNC threads, multiple material and finish options, and package sizes intended for both individual adjustment work and recurring assembly needs.

Visual Guide

Popular examples in this category

5/16-18 UNC Nylon Insert Lock Nuts, Stainless Steel, Pack of 1005/16-18 UNC Nylon Insert Lock Nuts, Stainless Steel, Pack of 100WBB2101058M25 x 1.5 Slotted Spanner Lock Nut with Polyamide InsertM25 x 1.5 Slotted Spanner Lock Nut with Polyamide InsertWBB2680202M30 x 1.5 Slotted Spanner Lock Nut with Polyamide InsertM30 x 1.5 Slotted Spanner Lock Nut with Polyamide InsertWBB2680205M8 Zinc-Plated 4-Prong T-Nut, 100-PackM8 Zinc-Plated 4-Prong T-Nut, 100-PackWBB2337181
Use Cases

Secure compatible threaded connections

Nylon insert lock nuts are represented for maintenance and assembly work involving compatible threaded fasteners. Available examples include M5 x 0.8, M6 x 1.0, M8 x 1.25, and 5/16-18 UNC threads.

How to Choose

Match the thread before selecting the style

Confirm the required thread size and pitch or UNC designation first. Then compare nylon insert, slotted spanner, or external-tooth locking configurations, along with material, finish, and package quantity.

Applications

Support fastening and adjustable setups

Slotted spanner lock nuts with polyamide inserts are suited to compatible threaded components that need to be secured while positional adjustments are made. Their self-locking design allows use as setting nuts.

Additional Info

Consider related fastening hardware

Four-prong T-nuts provide threaded fastening points for M6 or M8 hardware, while 1/4-20 machine screws are available for joining components. These are distinct product types from lock nuts and should be selected for their specific role.

3Locking configurations

Nylon insert, polyamide-insert slotted spanner, and external-tooth styles are represented.

8Lock nut thread sizes

Examples range from M5 x 0.8 and 10-32 to M35 x 1.5.

100Pack count options

Many listed nylon insert, external-tooth, and T-nut products are sold in 100-count packages.

3/16 in.Spanner slot size

Listed slotted spanner lock nuts provide a 3/16 in. slot for spanner engagement.

Comparison Guide

Compare the Locking Fastener Styles Represented

Use this overview to distinguish the listed locking configurations and related threaded fastening options.

Product typeWhat it providesSelection considerations
Nylon insert lock nutsA nylon insert that provides a locking feature; the M6 x 1.0 style helps resist turning through compressive force against screw threads.Match M5 x 0.8, M6 x 1.0, M8 x 1.25, or 5/16-18 UNC threads; compare steel and stainless steel options.
Slotted spanner lock nutsA polyamide insert for self-locking action and a 3/16 in. slot for spanner engagement; can serve as setting nuts.Match M15 x 1, M25 x 1.5, M30 x 1.5, or M35 x 1.5 threads when installation or adjustment is needed.
External-tooth lock nuts and related hardwareA 10-32 external-tooth lock nut provides a distinct locking configuration; T-nuts provide threaded fastening points, and machine screws join components.Confirm whether the job requires a locking nut, a threaded fastening point, or a matching screw.
Planning Guide

Plan the right fit before choosing

Thread Compatibility

Match the nut to the exact mating thread

Lock nut options represented in this category cover several common sizes. Metric nylon insert styles include M5 x 0.8, M6 x 1.0, and M8 x 1.25, while an inch-thread option is available in 5/16-18 UNC. Slotted spanner styles are represented in M15 x 1, M25 x 1.5, M30 x 1.5, and M35 x 1.5. An external-tooth lock nut is available for 10-32 connections.

  • Use the full thread designation, including pitch for metric hardware.
  • Choose 5/16-18 UNC only for compatible UNC threaded connections.
  • For slotted spanner styles, confirm the compatible metric thread size before installation.
Locking and Adjustment Styles

Select the configuration that suits the fastening task

Nylon insert lock nuts use a nylon insert to provide the locking feature; one M6 x 1.0 option is described as applying compressive force against screw threads to help resist turning. Slotted spanner lock nuts use a polyamide insert for self-locking action and have a 3/16 in. slot for spanner engagement during installation or adjustment. The 10-32 style uses an external-tooth locking design.

  • Choose nylon insert lock nuts for compatible threaded assembly connections.
  • Choose slotted spanner lock nuts when spanner engagement and adjustment are needed.
  • Choose the 10-32 external-tooth style when that locking configuration is required.
Material, Finish, and Quantity

Align the hardware with your purchasing requirements

The represented lock nuts include steel, zinc-plated steel, 18-8 stainless steel, and 304 stainless steel options. Several nylon insert and external-tooth products come in 100-count packages for maintenance inventory, replenishment, and repeated assembly work. The listed M8 x 1.25 and M6 x 1.0 nylon insert lock nuts include DIN 985 references for buyers with those requirements.

  • Compare steel, zinc-plated steel, 18-8 stainless steel, and 304 stainless steel constructions as listed.
  • Select 100-count packs when multiple matching fasteners are needed.
  • Check DIN 985 requirements against the specific M8 x 1.25 or M6 x 1.0 products listed.
FAQ

Common questions before buying

How do I select the correct lock nut thread?

Match the exact thread designation of the compatible threaded component, including metric pitch where listed or the UNC designation for the 5/16-18 option.

What is the difference between nylon insert and slotted spanner lock nuts?

Nylon insert lock nuts use a nylon insert as the locking feature. Slotted spanner lock nuts use a polyamide insert for self-locking action and include a 3/16 in. slot for spanner engagement during installation or adjustment.

Which listed lock nuts can be used as setting nuts?

The slotted spanner lock nuts with polyamide inserts are described as self-locking and able to serve as setting nuts where adjustment is needed.

Are 100-count packages available?

Yes. Multiple nylon insert lock nuts, the 10-32 external-tooth lock nut, and the listed M6 and M8 four-prong T-nuts are available in 100-count packages.

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