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Lock Nuts – Secure Fastening Solutions Built to Last

Here at BEP Ltd, we offer a selection of lock nuts that achieve this goal as well, eradicating the risks of vibration vibrations which can cause problems to equipment driven by torques and external fiords. For automotive, industrial or structural application lock nuts, our range that includes nyloc nuts and all-metal NutLocks provides the strength engineers expect.

What Makes Lock Nuts Different?

Locking nuts, also referred to as locknuts, prevailing torque nuts or self-locking nuts, are designed to remain securely fastened under conditions that would cause a normal nut to loosen.

They usually operate by requiring prevailing torque during installation that generally comes in the form of deformed threads, inserts or serrated surfaces which bite into the mating bolt.

Lock Nut Types & Use Cases

Type

How It Locks

Best For

Nylon-insert (Nyloc)

Nylon ring creates friction with threads

General use; up to ~250°F

Distorted-thread

Deformed threads press against bolt threads

High-temperature, reusable

Serrated Flange

Angled ridges bite into surface

Prevents rotation; no washer needed

Security Locknut

Steel ring applies clamping friction and load isolation

Heavy vibration and rail applications

Split-beam / Stover

Slotted top sections expand to grip threads

High-temp, reusable up to ~1400°F


Why Choose BEP’s Lock Nut Range?

  • Expertly Selected Inventory – We stock high-quality prevailing torque, Nyloc, all-metal, and security lock nuts.
  • Trusted in High-Stress Environments – Ideal for automotive, aerospace, oil & gas, and heavy machinery applications (where failure isn’t an option) 
  • UK-Based Distribution – Fast dispatch, excellent customer service, and available for bulk or OEM orders.
  • Companion Support – Not sure which lock nut you need? Our technical team is ready to guide you through material, size, and environment matchups.

Frequently Asked Questions (FAQs)

Q1. What is a lock nut, and how is it different from a regular nut?

A lock nut resists loosening under vibration, using features like elastic deformation or surface interference, unlike standard nuts that rely on external aids like thread-lock fluid 

Q2. When should I choose a Nyloc nut?

Use for general applications, especially involving moderate vibration and temperatures up to ~250°F. Not recommended for extreme heat or repeated re-use 

Q3. What are all-metal lock nuts used for?

They're ideal for high-temperature, harsh environments where reusable and low-failure lock nuts are needed—from automotive to industrial across wide temperature ranges 

Q4. Can security locknuts be reused?

Yes. Their resilient steel lock ring design ensures consistent locking torque over repeated cycles—perfect for systems where disassembly and reassembly are routine 

Lock Nuts

Lock Nuts – Secure Fastening Solutions Built to Last

Here at BEP Ltd, we offer a selection of lock nuts that achieve this goal as well, eradicating the risks of vibration vibrations which can cause problems to equipment driven by torques and external fiords. For automotive, industrial or structural application lock nuts, our range that includes nyloc nuts and all-metal NutLocks provides the strength engineers expect.

What Makes Lock Nuts Different?

Locking nuts, also referred to as locknuts, prevailing torque nuts or self-locking nuts, are designed to remain securely fastened under conditions that would cause a normal nut to loosen.

They usually operate by requiring prevailing torque during installation that generally comes in the form of deformed threads, inserts or serrated surfaces which bite into the mating bolt.

Lock Nut Types & Use Cases

Type

How It Locks

Best For

Nylon-insert (Nyloc)

Nylon ring creates friction with threads

General use; up to ~250°F

Distorted-thread

Deformed threads press against bolt threads

High-temperature, reusable

Serrated Flange

Angled ridges bite into surface

Prevents rotation; no washer needed

Security Locknut

Steel ring applies clamping friction and load isolation

Heavy vibration and rail applications

Split-beam / Stover

Slotted top sections expand to grip threads

High-temp, reusable up to ~1400°F


Why Choose BEP’s Lock Nut Range?

  • Expertly Selected Inventory – We stock high-quality prevailing torque, Nyloc, all-metal, and security lock nuts.
  • Trusted in High-Stress Environments – Ideal for automotive, aerospace, oil & gas, and heavy machinery applications (where failure isn’t an option) 
  • UK-Based Distribution – Fast dispatch, excellent customer service, and available for bulk or OEM orders.
  • Companion Support – Not sure which lock nut you need? Our technical team is ready to guide you through material, size, and environment matchups.

Frequently Asked Questions (FAQs)

Q1. What is a lock nut, and how is it different from a regular nut?

A lock nut resists loosening under vibration, using features like elastic deformation or surface interference, unlike standard nuts that rely on external aids like thread-lock fluid 

Q2. When should I choose a Nyloc nut?

Use for general applications, especially involving moderate vibration and temperatures up to ~250°F. Not recommended for extreme heat or repeated re-use 

Q3. What are all-metal lock nuts used for?

They're ideal for high-temperature, harsh environments where reusable and low-failure lock nuts are needed—from automotive to industrial across wide temperature ranges 

Q4. Can security locknuts be reused?

Yes. Their resilient steel lock ring design ensures consistent locking torque over repeated cycles—perfect for systems where disassembly and reassembly are routine 

KMK4 28x32x9mm SKF Lock Nut

£30.85 - £30.85
£30.85
£30.85 - £30.85
£30.85

KMK4 28x32x9mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£30.85 - £30.85
£30.85
£30.85 - £30.85
£30.85

KMK3 24x28x9mm SKF Lock Nut

£26.25 - £26.25
£26.25
£26.25 - £26.25
£26.25

KMK3 24x28x9mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£26.25 - £26.25
£26.25
£26.25 - £26.25
£26.25

KMK20 122x130x20mm SKF Lock Nut

£142.05 - £142.05
£142.05
£142.05 - £142.05
£142.05

KMK20 122x130x20mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£142.05 - £142.05
£142.05
£142.05 - £142.05
£142.05

KMK2 21x25x9mm SKF Lock Nut

£23.59 - £23.59
£23.59
£23.59 - £23.59
£23.59

KMK2 21x25x9mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£23.59 - £23.59
£23.59
£23.59 - £23.59
£23.59

KMK19 117x125x20mm SKF Lock Nut

£128.97 - £128.97
£128.97
£128.97 - £128.97
£128.97

KMK19 117x125x20mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£128.97 - £128.97
£128.97
£128.97 - £128.97
£128.97

KMK18 112x120x18mm SKF Lock Nut

£126.32 - £126.32
£126.32
£126.32 - £126.32
£126.32

KMK18 112x120x18mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£126.32 - £126.32
£126.32
£126.32 - £126.32
£126.32

KMK17 103x110x18mm SKF Lock Nut

£112.53 - £112.53
£112.53
£112.53 - £112.53
£112.53

KMK17 103x110x18mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£112.53 - £112.53
£112.53
£112.53 - £112.53
£112.53

KMK16 98x105x18mm SKF Lock Nut

£73.37 - £73.37
£73.37
£73.37 - £73.37
£73.37

KMK16 98x105x18mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£73.37 - £73.37
£73.37
£73.37 - £73.37
£73.37

KMK14 85x92x14mm SKF Lock Nut

£68.86 - £68.86
£68.86
£68.86 - £68.86
£68.86

KMK14 85x92x14mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£68.86 - £68.86
£68.86
£68.86 - £68.86
£68.86

KMK15 91x98x14mm SKF Lock Nut

£69.81 - £69.81
£69.81
£69.81 - £69.81
£69.81

KMK15 91x98x14mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£69.81 - £69.81
£69.81
£69.81 - £69.81
£69.81

KMK13 79x85x14mm SKF Lock Nut

£65.05 - £65.05
£65.05
£65.05 - £65.05
£65.05

KMK13 79x85x14mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£65.05 - £65.05
£65.05
£65.05 - £65.05
£65.05

KMK12 74x80x15mm SKF Lock Nut

£48.87 - £48.87
£48.87
£48.87 - £48.87
£48.87

KMK12 74x80x15mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£48.87 - £48.87
£48.87
£48.87 - £48.87
£48.87

KMK11 69x75x15mm SKF Lock Nut

£46.13 - £46.13
£46.13
£46.13 - £46.13
£46.13

KMK11 69x75x15mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£46.13 - £46.13
£46.13
£46.13 - £46.13
£46.13

KMK10 65x70x15mm SKF Lock Nut

£43.40 - £43.40
£43.40
£43.40 - £43.40
£43.40

KMK10 65x70x15mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£43.40 - £43.40
£43.40
£43.40 - £43.40
£43.40

KMK0 16x20x9mm SKF Lock Nut

£43.28 - £43.28
£43.28
£43.28 - £43.28
£43.28

KMK0 16x20x9mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£43.28 - £43.28
£43.28
£43.28 - £43.28
£43.28

KMFE8 47x58x13mm SKF Lock Nut

£29.76 - £29.76
£29.76
£29.76 - £29.76
£29.76

KMFE8 47x58x13mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£29.76 - £29.76
£29.76
£29.76 - £29.76
£29.76

KMFE7 42.5x52x11.5mm SKF Lock Nut

£29.50 - £29.50
£29.50
£29.50 - £29.50
£29.50

KMFE7 42.5x52x11.5mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£29.50 - £29.50
£29.50
£29.50 - £29.50
£29.50

KMFE6 36x45x10.5mm SKF Lock Nut

£27.67 - £27.67
£27.67
£27.67 - £27.67
£27.67

KMFE6 36x45x10.5mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£27.67 - £27.67
£27.67
£27.67 - £27.67
£27.67

KMFE19 110x125x20mm SKF Lock Nut

£158.28 - £158.28
£158.28
£158.28 - £158.28
£158.28

KMFE19 110x125x20mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£158.28 - £158.28
£158.28
£158.28 - £158.28
£158.28

KMFE5 31x38x10.5mm SKF Lock Nut

£25.51 - £25.51
£25.51
£25.51 - £25.51
£25.51

KMFE5 31x38x10.5mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£25.51 - £25.51
£25.51
£25.51 - £25.51
£25.51

KMFE4 26x32x9.5mm SKF Lock Nut

£23.34 - £23.34
£23.34
£23.34 - £23.34
£23.34

KMFE4 26x32x9.5mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£23.34 - £23.34
£23.34
£23.34 - £23.34
£23.34

KMFE22 122x145x21.5mm SKF Lock Nut

£63.78 - £63.78
£63.78
£63.78 - £63.78
£63.78

KMFE22 122x145x21.5mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£63.78 - £63.78
£63.78
£63.78 - £63.78
£63.78

KMFE20 112x130x21mm SKF Lock Nut

£56.35 - £56.35
£56.35
£56.35 - £56.35
£56.35

KMFE20 112x130x21mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£56.35 - £56.35
£56.35
£56.35 - £56.35
£56.35

KMFE18 102x120x19mm SKF Lock Nut

£48.85 - £48.85
£48.85
£48.85 - £48.85
£48.85

KMFE18 102x120x19mm SKF Lock Nut Please Note: If selected brand is not available a suitable alternative will be supplied in Timken, NSK, FAG or NKE

£48.85 - £48.85
£48.85
£48.85 - £48.85
£48.85

Hi. Need any help?