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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 

KM14 - FBJ Lock Nut Bearing - 70x92x12mm

£5.20 - £5.20
£5.20
£5.20 - £5.20
£5.20

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£5.20 - £5.20
£5.20
£5.20 - £5.20
£5.20

KM10 - FBJ Lock Nut -61x70x11mm

£3.18 - £3.18
£3.18
£3.18 - £3.18
£3.18

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£3.18 - £3.18
£3.18
£3.18 - £3.18
£3.18

KM09 - FBJ Lock Nut Bearing - 56x65x10mm

£2.65 - £2.65
£2.65
£2.65 - £2.65
£2.65

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£2.65 - £2.65
£2.65
£2.65 - £2.65
£2.65

KM07 - FBJ Lock Nut Bearing - 35x52x8mm

£1.94 - £1.94
£1.94
£1.94 - £1.94
£1.94

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£1.94 - £1.94
£1.94
£1.94 - £1.94
£1.94

KM06 - FBJ Lock Nut Bearing - 30x45x7mm

£2.12 - £2.12
£2.12
£2.12 - £2.12
£2.12

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£2.12 - £2.12
£2.12
£2.12 - £2.12
£2.12

KM05 - FBJ Lock Nut Bearing - 32x38x7mm

£1.94 - £1.94
£1.94
£1.94 - £1.94
£1.94

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£1.94 - £1.94
£1.94
£1.94 - £1.94
£1.94

KM04 - FBJ Lock Nut Bearing - 20x32x6mm

£1.52 - £1.52
£1.52
£1.52 - £1.52
£1.52

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£1.52 - £1.52
£1.52
£1.52 - £1.52
£1.52

KM03 - FBJ Lock Nut Bearing - 17x28x5mm

£1.06 - £1.06
£1.06
£1.06 - £1.06
£1.06

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£1.06 - £1.06
£1.06
£1.06 - £1.06
£1.06

AN21 - FBJ Lock Nut Bearing - 105x140x18mm

£0.00 - £0.00
£0.00
£0.00 - £0.00
£0.00

Thanks for looking: Should the selected brand not be available a suitable alternative will be sent.

£0.00 - £0.00
£0.00
£0.00 - £0.00
£0.00

TMHN7 SKF Bearing Lock Nut Spanner

£419.57 - £419.57
£419.57
£419.57 - £419.57
£419.57

This set of lock nut spanners is designed especially for mounting self-aligning bearings, as well as CARB toroidal roller bearings and small spheri...

Ver todos los detalles
£419.57 - £419.57
£419.57
£419.57 - £419.57
£419.57

TMFS0 SKF Axial Lock Nut Socket

£57.55 - £57.55
£57.55
£57.55 - £57.55
£57.55

SKF axial lock nut sockets require less space around the bearing arrangement than hook spanners, and fit nuts from the KM, KMK and KMF series

£57.55 - £57.55
£57.55
£57.55 - £57.55
£57.55

TMFS16 SKF Axial Lock Nut Socket

£255.02 - £255.02
£255.02
£255.02 - £255.02
£255.02

SKF axial lock nut sockets require less space around the bearing arrangement than hook spanners, and fit nuts from the KM, KMK and KMF series

£255.02 - £255.02
£255.02
£255.02 - £255.02
£255.02

TMFS1 SKF Axial Lock Nut Socket

£64.71 - £64.71
£64.71
£64.71 - £64.71
£64.71

SKF axial lock nut sockets require less space around the bearing arrangement than hook spanners, and fit nuts from the KM, KMK and KMF series

£64.71 - £64.71
£64.71
£64.71 - £64.71
£64.71

HN5-6 SKF Hook Type Lock Nut Spanner 38 45mm

£18.87 - £18.87
£18.87
£18.87 - £18.87
£18.87

This HN5-6 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£18.87 - £18.87
£18.87
£18.87 - £18.87
£18.87

HN8-9 SKF Hook Type Lock Nut Spanner 58 65mm

£24.65 - £24.65
£24.65
£24.65 - £24.65
£24.65

This HN8-9 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£24.65 - £24.65
£24.65
£24.65 - £24.65
£24.65

HN7 SKF Hook Type Lock Nut Spanner 52 55mm

£22.99 - £22.99
£22.99
£22.99 - £22.99
£22.99

This HN7- SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£22.99 - £22.99
£22.99
£22.99 - £22.99
£22.99

HN4 SKF Hook Type Lock Nut Spanner 30 32mm

£18.87 - £18.87
£18.87
£18.87 - £18.87
£18.87

This HN4 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£18.87 - £18.87
£18.87
£18.87 - £18.87
£18.87

HN1 SKF Hook Type Lock Nut Spanner 20 22mm

£16.42 - £16.42
£16.42
£16.42 - £16.42
£16.42

This HN1 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£16.42 - £16.42
£16.42
£16.42 - £16.42
£16.42

HN2-3 SKF Hook Type Lock Nut Spanner 25 28mm

£18.06 - £18.06
£18.06
£18.06 - £18.06
£18.06

This HN2-3 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£18.06 - £18.06
£18.06
£18.06 - £18.06
£18.06

HN21-22 SKF Hook Type Lock Nut Spanner 135 145mm

£55.91 - £55.91
£55.91
£55.91 - £55.91
£55.91

This HN21-22 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£55.91 - £55.91
£55.91
£55.91 - £55.91
£55.91

HN16 SKF Hook Type Lock Nut Spanner 105mm

£35.33 - £35.33
£35.33
£35.33 - £35.33
£35.33

This HN16 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£35.33 - £35.33
£35.33
£35.33 - £35.33
£35.33

HN18-20 SKF Hook Type Lock Nut Spanner 120 130mm

£45.22 - £45.22
£45.22
£45.22 - £45.22
£45.22

This HN18-20 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£45.22 - £45.22
£45.22
£45.22 - £45.22
£45.22

HN17 SKF Hook Type Lock Nut Spanner 110 115mm

£41.10 - £41.10
£41.10
£41.10 - £41.10
£41.10

This HN17 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£41.10 - £41.10
£41.10
£41.10 - £41.10
£41.10

HN14 SKF Hook Type Lock Nut spanner 92mm

£30.40 - £30.40
£30.40
£30.40 - £30.40
£30.40

This HN14 SKF hook spanner is designed for use with SKF KM nuts as well as any other KM nuts conforming to the DIN981 standard.

£30.40 - £30.40
£30.40
£30.40 - £30.40
£30.40

Hi. Need any help?