Skip to content
We are Open 9am - 4pm GMT
We are Open 9am - 4pm GMT
FREE UK DELIVERY OVER £100
LOW COST WORLDWIDE DISTRIBUTION
NEXT / SAME DAY DELIVERY AVAILABLE
NEED HELP? EMAIL US....

Pilot Bore Sprockets – 3/4” Pitch Roller Chain Sprockets

Here at Bolton Engineering Products Ltd we stock a full range of pilot bore sprockets, for dependable effective power transmission in industrial conveyor and mechanical drive applications.

by the plastic roller sleeves which reduce noise and protection from other accidental damage, our 3/4 pitch industry standard roller chain sprockets are built to British Standard as is a sign of quality you can trust.

If you’re in need of one off pilot bore or volume quantities for OEM accounts, BEP Ltd provides excellent value and precision manufactured components.

What Is a Pilot Bore Sprocket?

A pilot bore sprocket (also known as a rough stock bore sprocket) is supplied with an oversized or unfinished bore, allowing the user to machine it to the exact shaft size required.

  • This makes it a versatile solution for engineers needing:
  • Custom bore sizes
  • Keyways or set screw modifications
  • Fitment to bushings, hubs, or custom shafts

Pilot bore sprockets are widely used in:

  • Manufacturing machinery
  • Agricultural equipment
  • Material handling and conveyors
  • Bicycles, motorcycles, and chain-driven vehicles

Technical Specifications

Specification

Details

Product Type

Pilot Bore Sprocket (Rough Stock Bore)

Chain Pitch

3/4” Pitch Roller Chain (BS Standard)

Tooth Options

10 – 50+ Teeth Available

Material

Steel / Hardened Steel

Bore Type

Pilot Bore (Machinable to Customer Specification)

Mounting Options

Direct Shaft Mount / Hub / Bushing

Tooth Profile

British Standard (BS Sprockets)

Applications

Industrial Drives, Machinery, Conveyors, Agricultural

Finish

Phosphate, Black Oxide, or Untreated (Depending Model)

Key Features & Benefits

  • Machinable Bore: Machine the bore to your precise specifications.
  • BS-Standard Compatibility: Suitable for BS roller chain, perfect matching.
  • Strong Material: Constructed of sturdy and durable steel material for long use life.
  • Various Sizes - everything from small sprockets to heavy-duty models for big chain drives.
  • Quick UK Delivery: We have lots of stock and we dispatch the same working day.

Why Choose Bolton Engineering Products Ltd?

As a trusted UK supplier of pilot bore sprockets, BEP Ltd offers:

  • Extensive stock of BS sprockets for 3/4 pitch roller chains
  • Competitive pricing with bulk-order discounts
  • High-quality sprockets sourced from reliable manufacturers
  • Expert support to help you choose the right sprocket for your application
  • Easy online ordering and fast nationwide delivery

Whether you’re replacing worn components or building a new chain-drive system, we ensure you get the right pilot bore sprocket every time.

FAQs

Q1: What is a pilot bore sprocket used for?

It allows the user to customize the bore and keyway for specific shaft or hub sizes, making it highly versatile in machinery and chain drive systems.

Q2: Are these sprockets compatible with BS roller chains?

Yes. Our sprockets are manufactured to BS standards, suitable for 3/4 pitch roller chains.

Q3: Can I request machining for the bore or keyway?

Yes. We can supply pilot bore sprockets as-is or can assist with machining recommendations.

Q4: Do you offer large quantities for OEM or industrial use?

Absolutely. Bulk purchasing options and trade pricing are available.

Roller Chain Pilot Bore Sprockets - 3/4

Pilot Bore Sprockets – 3/4” Pitch Roller Chain Sprockets

Here at Bolton Engineering Products Ltd we stock a full range of pilot bore sprockets, for dependable effective power transmission in industrial conveyor and mechanical drive applications.

by the plastic roller sleeves which reduce noise and protection from other accidental damage, our 3/4 pitch industry standard roller chain sprockets are built to British Standard as is a sign of quality you can trust.

If you’re in need of one off pilot bore or volume quantities for OEM accounts, BEP Ltd provides excellent value and precision manufactured components.

What Is a Pilot Bore Sprocket?

A pilot bore sprocket (also known as a rough stock bore sprocket) is supplied with an oversized or unfinished bore, allowing the user to machine it to the exact shaft size required.

  • This makes it a versatile solution for engineers needing:
  • Custom bore sizes
  • Keyways or set screw modifications
  • Fitment to bushings, hubs, or custom shafts

Pilot bore sprockets are widely used in:

  • Manufacturing machinery
  • Agricultural equipment
  • Material handling and conveyors
  • Bicycles, motorcycles, and chain-driven vehicles

Technical Specifications

Specification

Details

Product Type

Pilot Bore Sprocket (Rough Stock Bore)

Chain Pitch

3/4” Pitch Roller Chain (BS Standard)

Tooth Options

10 – 50+ Teeth Available

Material

Steel / Hardened Steel

Bore Type

Pilot Bore (Machinable to Customer Specification)

Mounting Options

Direct Shaft Mount / Hub / Bushing

Tooth Profile

British Standard (BS Sprockets)

Applications

Industrial Drives, Machinery, Conveyors, Agricultural

Finish

Phosphate, Black Oxide, or Untreated (Depending Model)

Key Features & Benefits

  • Machinable Bore: Machine the bore to your precise specifications.
  • BS-Standard Compatibility: Suitable for BS roller chain, perfect matching.
  • Strong Material: Constructed of sturdy and durable steel material for long use life.
  • Various Sizes - everything from small sprockets to heavy-duty models for big chain drives.
  • Quick UK Delivery: We have lots of stock and we dispatch the same working day.

Why Choose Bolton Engineering Products Ltd?

As a trusted UK supplier of pilot bore sprockets, BEP Ltd offers:

  • Extensive stock of BS sprockets for 3/4 pitch roller chains
  • Competitive pricing with bulk-order discounts
  • High-quality sprockets sourced from reliable manufacturers
  • Expert support to help you choose the right sprocket for your application
  • Easy online ordering and fast nationwide delivery

Whether you’re replacing worn components or building a new chain-drive system, we ensure you get the right pilot bore sprocket every time.

FAQs

Q1: What is a pilot bore sprocket used for?

It allows the user to customize the bore and keyway for specific shaft or hub sizes, making it highly versatile in machinery and chain drive systems.

Q2: Are these sprockets compatible with BS roller chains?

Yes. Our sprockets are manufactured to BS standards, suitable for 3/4 pitch roller chains.

Q3: Can I request machining for the bore or keyway?

Yes. We can supply pilot bore sprockets as-is or can assist with machining recommendations.

Q4: Do you offer large quantities for OEM or industrial use?

Absolutely. Bulk purchasing options and trade pricing are available.

6sr15-pilot-bore-12b-3-4-pitch-sprocket-1

6SR15 (12B-1-15) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 15 Tooth

£5.98 - £5.98
£5.98
£5.98 - £5.98
£5.98

6SR15 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR15 Pitch 3/4 Teeth 15 Outside Dia (mm) 99.8 ...

View full details
£5.98 - £5.98
£5.98
£5.98 - £5.98
£5.98
6sr13-pilot-bore-12b-3-4-pitch-sprocket

6SR13 (12B-1-13) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 13 Tooth

£5.40 - £5.40
£5.40
£5.40 - £5.40
£5.40

6SR13 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR13 Pitch 3/4 Teeth 13 Outside Dia (mm) 87.5 ...

View full details
£5.40 - £5.40
£5.40
£5.40 - £5.40
£5.40
6SR14-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-14-Tooth

6SR14 (12B-1-14) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 14 Tooth

£33.68 - £33.68
£33.68
£33.68 - £33.68
£33.68

6SR14 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR14 Pitch 3/4 Teeth 14 Outside...

View full details
£33.68 - £33.68
£33.68
£33.68 - £33.68
£33.68
6sr19-pilot-bore-12b-3-4-pitch-sprocket

6SR19 (12B-1-19) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 19 Tooth

£8.46 - £8.46
£8.46
£8.46 - £8.46
£8.46

6SR19 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR19 Pitch 3/4 Teeth 19 Outside Dia (mm) 124.2 ...

View full details
£8.46 - £8.46
£8.46
£8.46 - £8.46
£8.46
6SR19-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-19-Tooth

6SR19 (12B-1-19) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 19 Tooth

£50.37 - £50.37
£50.37
£50.37 - £50.37
£50.37

6SR19 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR19 Pitch 3/4 Teeth 19 Outside...

View full details
£50.37 - £50.37
£50.37
£50.37 - £50.37
£50.37
6dr27-pilot-bore-12b-3-4-pitch-sprocket

6DR27 (12B-2-27) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 27 Tooth

£30.33 - £30.33
£30.33
£30.33 - £30.33
£30.33

6DR27 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR27 Pitch 3/4 Teeth 27 Outside Dia (mm) 172.3 ...

View full details
£30.33 - £30.33
£30.33
£30.33 - £30.33
£30.33

6SR25 35mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 25 Tooth

£40.92 - £40.92
£40.92
£40.92 - £40.92
£40.92

Roller Chain Sprocket 12B 6SR25 35mm Bore Key & 2 Set Screws 3/4" Pitch 25 ToothChain Pitch:12B-1Number of Teeth:25Bore & Keyway(mm):35mmMf...

View full details
£40.92 - £40.92
£40.92
£40.92 - £40.92
£40.92

6SR16 30mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 16 Tooth

£23.32 - £23.32
£23.32
£23.32 - £23.32
£23.32

Roller Chain Sprocket 12B 6SR16 30mm Bore Key & 2 Set Screws 3/4" Pitch 16 ToothChain Pitch:12B-1Number of Teeth:16Bore & Keyway(mm):30mmMf...

View full details
£23.32 - £23.32
£23.32
£23.32 - £23.32
£23.32

6SR15 40mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 15 Tooth

£21.68 - £21.68
£21.68
£21.68 - £21.68
£21.68

Roller Chain Sprocket 12B 6SR15 40mm Bore Key & 2 Set Screws 3/4" Pitch 15 ToothChain Pitch:12B-1Number of Teeth:15Bore & Keyway(mm):40mmMf...

View full details
£21.68 - £21.68
£21.68
£21.68 - £21.68
£21.68

6SR12 22mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 12 Tooth

£15.30 - £15.30
£15.30
£15.30 - £15.30
£15.30

Roller Chain Sprocket 12B 6SR12 22mm Bore Key & 2 Set Screws 3/4" Pitch 12 ToothChain Pitch:12B-1Number of Teeth:12Bore & Keyway(mm):22mmMf...

View full details
£15.30 - £15.30
£15.30
£15.30 - £15.30
£15.30
6SR11-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-11-Tooth

6SR11 (12B-1-11) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 11 Tooth

£21.44 - £21.44
£21.44
£21.44 - £21.44
£21.44

6SR11 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR11 Pitch 3/4 Teeth 11 Outside...

View full details
£21.44 - £21.44
£21.44
£21.44 - £21.44
£21.44
6SR12-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-12-Tooth

6SR12 (12B-1-12) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 12 Tooth

£25.06 - £25.06
£25.06
£25.06 - £25.06
£25.06

6SR12 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR12 Pitch 3/4 Teeth 12 Outside...

View full details
£25.06 - £25.06
£25.06
£25.06 - £25.06
£25.06
6SR13-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-13-Tooth

6SR13 (12B-1-13) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 13 Tooth

£29.25 - £29.25
£29.25
£29.25 - £29.25
£29.25

6SR13 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR13 Pitch 3/4 Teeth 13 Outside...

View full details
£29.25 - £29.25
£29.25
£29.25 - £29.25
£29.25
6SR18-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-18-Tooth

6SR18 (12B-1-18) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 18 Tooth

£48.06 - £48.06
£48.06
£48.06 - £48.06
£48.06

6SR18 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR18 Pitch 3/4 Teeth 18 Outside...

View full details
£48.06 - £48.06
£48.06
£48.06 - £48.06
£48.06
6SR24-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-24-Tooth

6SR24 (12B-1-24) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 24 Tooth

£77.28 - £77.28
£77.28
£77.28 - £77.28
£77.28

6SR24 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR24 Pitch 3/4 Teeth 24 Outside...

View full details
£77.28 - £77.28
£77.28
£77.28 - £77.28
£77.28
6tr31-pilot-bore-12b-3-4-pitch-sprocket

6TR31 (12B-3-31) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 31 Tooth

£58.02 - £58.02
£58.02
£58.02 - £58.02
£58.02

6TR31 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR31 Pitch 3/4 Teeth 31 Outside Dia (mm) 19...

View full details
£58.02 - £58.02
£58.02
£58.02 - £58.02
£58.02
6tr20-pilot-bore-12b-3-4-pitch-sprocket

6TR20 (12B-3-20) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 20 Tooth

£26.79 - £26.79
£26.79
£26.79 - £26.79
£26.79

6TR20 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR20 Pitch 3/4 Teeth 20 Outside Dia (mm) 12...

View full details
£26.79 - £26.79
£26.79
£26.79 - £26.79
£26.79
6tr15-pilot-bore-12b-3-4-pitch-sprocket

6TR15 (12B-3-15) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 15 Tooth

£15.68 - £15.68
£15.68
£15.68 - £15.68
£15.68

6TR15 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR15 Pitch 3/4 Teeth 15 Outside Dia (mm) 99.8...

View full details
£15.68 - £15.68
£15.68
£15.68 - £15.68
£15.68
6dr30-pilot-bore-12b-3-4-pitch-sprocket

6DR30 (12B-2-30) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 30 Tooth

£36.18 - £36.18
£36.18
£36.18 - £36.18
£36.18

6DR30 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR30 Pitch 3/4 Teeth 30 Outside Dia (mm) 190.5 ...

View full details
£36.18 - £36.18
£36.18
£36.18 - £36.18
£36.18
6dr19-pilot-bore-12b-3-4-pitch-sprocket

6DR19 (12B-2-19) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 19 Tooth

£16.74 - £16.74
£16.74
£16.74 - £16.74
£16.74

6DR19 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR19 Pitch 3/4 Teeth 19 Outside Dia (mm) 124.2 ...

View full details
£16.74 - £16.74
£16.74
£16.74 - £16.74
£16.74
6dr13-pilot-bore-12b-3-4-pitch-sprocket

6DR13 (12B-2-13) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 13 Tooth

£7.93 - £7.93
£7.93
£7.93 - £7.93
£7.93

6DR13 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR13 Pitch 3/4 Teeth 13 Outside Dia (mm) 87.5 ...

View full details
£7.93 - £7.93
£7.93
£7.93 - £7.93
£7.93
6dr12-pilot-bore-12b-3-4-pitch-sprocket

6DR12 (12B-2-12) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 12 Tooth

£6.83 - £6.83
£6.83
£6.83 - £6.83
£6.83

6DR12 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR12 Pitch 3/4 Teeth 12 Outside Dia (mm) 81.5 ...

View full details
£6.83 - £6.83
£6.83
£6.83 - £6.83
£6.83
6dr11-pilot-bore-12b-3-4-pitch-sprocket

6DR11 (12B-2-11) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 11 Tooth

£5.81 - £5.81
£5.81
£5.81 - £5.81
£5.81

6DR11 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR11 Pitch 3/4 Teeth 11 Outside Dia (mm) 75 Ov...

View full details
£5.81 - £5.81
£5.81
£5.81 - £5.81
£5.81
6sr31-pilot-bore-12b-3-4-pitch-sprocket

6SR31 (12B-1-31) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 31 Tooth

£18.05 - £18.05
£18.05
£18.05 - £18.05
£18.05

6SR31 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR31 Pitch 3/4 Teeth 31 Outside Dia (mm) 196.3 ...

View full details
£18.05 - £18.05
£18.05
£18.05 - £18.05
£18.05

Hi. Need any help?