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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.

6SR13 28mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 13 Tooth

£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

Roller Chain Sprocket 12B 6SR13 28mm Bore Key & 2 Set Screws 3/4" Pitch 13 ToothChain Pitch:12B-1Number of Teeth:13Bore & Keyway(mm):28mmMf...

View full details
£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

6SR13 25mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 13 Tooth

£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

Roller Chain Sprocket 12B 6SR13 25mm Bore Key & 2 Set Screws 3/4" Pitch 13 ToothChain Pitch:12B-1Number of Teeth:13Bore & Keyway(mm):25mmMf...

View full details
£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

6SR13 24mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 13 Tooth

£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

Roller Chain Sprocket 12B 6SR13 24mm Bore Key & 2 Set Screws 3/4" Pitch 13 ToothChain Pitch:12B-1Number of Teeth:13Bore & Keyway(mm):24mmMf...

View full details
£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

6SR13 22mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 13 Tooth

£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

Roller Chain Sprocket 12B 6SR13 22mm Bore Key & 2 Set Screws 3/4" Pitch 13 ToothChain Pitch:12B-1Number of Teeth:13Bore & Keyway(mm):22mmMf...

View full details
£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

6SR13 20mm Bore, Keyway & Grub Screws Roller Chain Sprocket 3/4" Pitch 13 Tooth

£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

Roller Chain Sprocket 12B 6SR13 20mm Bore Key & 2 Set Screws 3/4" Pitch 13 ToothChain Pitch:12B-1Number of Teeth:13Bore & Keyway(mm):20mmMf...

View full details
£16.08 - £16.08
£16.08
£16.08 - £16.08
£16.08

6SR12 30mm 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 30mm Bore Key & 2 Set Screws 3/4" Pitch 12 ToothChain Pitch:12B-1Number of Teeth:12Bore & Keyway(mm):30mmMf...

View full details
£15.30 - £15.30
£15.30
£15.30 - £15.30
£15.30

6SR12 28mm 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 28mm Bore Key & 2 Set Screws 3/4" Pitch 12 ToothChain Pitch:12B-1Number of Teeth:12Bore & Keyway(mm):28mmMf...

View full details
£15.30 - £15.30
£15.30
£15.30 - £15.30
£15.30

6SR12 25mm 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 25mm Bore Key & 2 Set Screws 3/4" Pitch 12 ToothChain Pitch:12B-1Number of Teeth:12Bore & Keyway(mm):25mmMf...

View full details
£15.30 - £15.30
£15.30
£15.30 - £15.30
£15.30

6SR12 24mm 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 24mm Bore Key & 2 Set Screws 3/4" Pitch 12 ToothChain Pitch:12B-1Number of Teeth:12Bore & Keyway(mm):24mmMf...

View full details
£15.30 - £15.30
£15.30
£15.30 - £15.30
£15.30

6SR12 20mm 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 20mm Bore Key & 2 Set Screws 3/4" Pitch 12 ToothChain Pitch:12B-1Number of Teeth:12Bore & Keyway(mm):20mmMf...

View full details
£15.30 - £15.30
£15.30
£15.30 - £15.30
£15.30
6SR16-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-16-Tooth

6SR16 (12B-1-16) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 16 Tooth

£41.36 - £41.36
£41.36
£41.36 - £41.36
£41.36

6SR16 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR16 Pitch 3/4 Teeth 16 Outside...

View full details
£41.36 - £41.36
£41.36
£41.36 - £41.36
£41.36
6SR17-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-17-Tooth

6SR17 (12B-1-17) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 17 Tooth

£44.73 - £44.73
£44.73
£44.73 - £44.73
£44.73

6SR17 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR17 Pitch 3/4 Teeth 17 Outside...

View full details
£44.73 - £44.73
£44.73
£44.73 - £44.73
£44.73
6SR20-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-20-Tooth

6SR20 (12B-1-20) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 20 Tooth

£52.84 - £52.84
£52.84
£52.84 - £52.84
£52.84

6SR20 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR20 Pitch 3/4 Teeth 20 Outside...

View full details
£52.84 - £52.84
£52.84
£52.84 - £52.84
£52.84
6SR21-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-21-Tooth

6SR21 (12B-1-21) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 21 Tooth

£68.26 - £68.26
£68.26
£68.26 - £68.26
£68.26

6SR21 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR21 Pitch 3/4 Teeth 21 Outside...

View full details
£68.26 - £68.26
£68.26
£68.26 - £68.26
£68.26
6SR22-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-22-Tooth

6SR22 (12B-1-22) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 22 Tooth

£71.25 - £71.25
£71.25
£71.25 - £71.25
£71.25

6SR22 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR22 Pitch 3/4 Teeth 22 Outside...

View full details
£71.25 - £71.25
£71.25
£71.25 - £71.25
£71.25
6SR23-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-23-Tooth

6SR23 (12B-1-23) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 23 Tooth

£73.71 - £73.71
£73.71
£73.71 - £73.71
£73.71

6SR23 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR23 Pitch 3/4 Teeth 23 Outside...

View full details
£73.71 - £73.71
£73.71
£73.71 - £73.71
£73.71
6SR25-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-25-Tooth

6SR25 (12B-1-25) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 25 Tooth

£80.71 - £80.71
£80.71
£80.71 - £80.71
£80.71

6SR25 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR25 Pitch 3/4 Teeth 25 Outside...

View full details
£80.71 - £80.71
£80.71
£80.71 - £80.71
£80.71
6SR27-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-27-Tooth

6SR27 (12B-1-27) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 27 Tooth

£91.25 - £91.25
£91.25
£91.25 - £91.25
£91.25

6SR27 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR27 Pitch 3/4 Teeth 27 Outside...

View full details
£91.25 - £91.25
£91.25
£91.25 - £91.25
£91.25
6SR30-BS-Stainless-Steel-Simplex-Pilot-Bore-12B-3/4"-Pitch-Sprocket-30-Tooth

6SR30 (12B-1-30) - BS Stainless Steel Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 30 Tooth

£102.16 - £102.16
£102.16
£102.16 - £102.16
£102.16

6SR30 Stainless Steel Pilot Bore 12B 3/4" Pitch Sprocket   For use with 12B-1 Simplex Chain   Part Number 6SR30 Pitch 3/4 Teeth 30 Outside...

View full details
£102.16 - £102.16
£102.16
£102.16 - £102.16
£102.16
6tr76-pilot-bore-12b-3-4-pitch-sprocket

6TR76 (12B-3-76) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 76 Tooth

£320.31 - £320.31
£320.31
£320.31 - £320.31
£320.31

6TR76 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR76 Pitch 3/4 Teeth 76 Outside Dia (mm) 46...

View full details
£320.31 - £320.31
£320.31
£320.31 - £320.31
£320.31
6tr57-pilot-bore-12b-3-4-pitch-sprocket

6TR57 (12B-3-57) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 57 Tooth

£194.22 - £194.22
£194.22
£194.22 - £194.22
£194.22

6TR57 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR57 Pitch 3/4 Teeth 57 Outside Dia (mm) 35...

View full details
£194.22 - £194.22
£194.22
£194.22 - £194.22
£194.22
6tr45-pilot-bore-12b-3-4-pitch-sprocket

6TR45 (12B-3-45) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 45 Tooth

£112.03 - £112.03
£112.03
£112.03 - £112.03
£112.03

6TR45 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR45 Pitch 3/4 Teeth 45 Outside Dia (mm) 28...

View full details
£112.03 - £112.03
£112.03
£112.03 - £112.03
£112.03
6tr40-pilot-bore-12b-3-4-pitch-sprocket

6TR40 (12B-3-40) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 40 Tooth

£89.59 - £89.59
£89.59
£89.59 - £89.59
£89.59

6TR40 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR40 Pitch 3/4 Teeth 40 Outside Dia (mm) 25...

View full details
£89.59 - £89.59
£89.59
£89.59 - £89.59
£89.59
6tr38-pilot-bore-12b-3-4-pitch-sprocket

6TR38 (12B-3-38) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 38 Tooth

£81.77 - £81.77
£81.77
£81.77 - £81.77
£81.77

6TR38 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR38 Pitch 3/4 Teeth 38 Outside Dia (mm) 23...

View full details
£81.77 - £81.77
£81.77
£81.77 - £81.77
£81.77

Hi. Need any help?