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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.

6tr37-pilot-bore-12b-3-4-pitch-sprocket

6TR37 (12B-3-37) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 37 Tooth

£78.05 - £78.05
£78.05
£78.05 - £78.05
£78.05

6TR37 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR37 Pitch 3/4 Teeth 37 Outside Dia (mm) 23...

View full details
£78.05 - £78.05
£78.05
£78.05 - £78.05
£78.05
6tr36-pilot-bore-12b-3-4-pitch-sprocket

6TR36 (12B-3-36) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 36 Tooth

£74.52 - £74.52
£74.52
£74.52 - £74.52
£74.52

6TR36 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR36 Pitch 3/4 Teeth 36 Outside Dia (mm) 22...

View full details
£74.52 - £74.52
£74.52
£74.52 - £74.52
£74.52
6tr35-pilot-bore-12b-3-4-pitch-sprocket

6TR35 (12B-3-35) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 35 Tooth

£71.36 - £71.36
£71.36
£71.36 - £71.36
£71.36

6TR35 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR35 Pitch 3/4 Teeth 35 Outside Dia (mm) 22...

View full details
£71.36 - £71.36
£71.36
£71.36 - £71.36
£71.36
6tr34-pilot-bore-12b-3-4-pitch-sprocket

6TR34 (12B-3-34) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 34 Tooth

£67.80 - £67.80
£67.80
£67.80 - £67.80
£67.80

6TR34 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR34 Pitch 3/4 Teeth 34 Outside Dia (mm) 21...

View full details
£67.80 - £67.80
£67.80
£67.80 - £67.80
£67.80
6tr33-pilot-bore-12b-3-4-pitch-sprocket

6TR33 (12B-3-33) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 33 Tooth

£65.01 - £65.01
£65.01
£65.01 - £65.01
£65.01

6TR33 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR33 Pitch 3/4 Teeth 33 Outside Dia (mm) 20...

View full details
£65.01 - £65.01
£65.01
£65.01 - £65.01
£65.01
6tr32-pilot-bore-12b-3-4-pitch-sprocket

6TR32 (12B-3-32) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 32 Tooth

£61.81 - £61.81
£61.81
£61.81 - £61.81
£61.81

6TR32 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR32 Pitch 3/4 Teeth 32 Outside Dia (mm) 20...

View full details
£61.81 - £61.81
£61.81
£61.81 - £61.81
£61.81
6tr30-pilot-bore-12b-3-4-pitch-sprocket

6TR30 (12B-3-30) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 30 Tooth

£54.08 - £54.08
£54.08
£54.08 - £54.08
£54.08

6TR30 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR30 Pitch 3/4 Teeth 30 Outside Dia (mm) 19...

View full details
£54.08 - £54.08
£54.08
£54.08 - £54.08
£54.08
6tr29-pilot-bore-12b-3-4-pitch-sprocket

6TR29 (12B-3-29) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 29 Tooth

£51.04 - £51.04
£51.04
£51.04 - £51.04
£51.04

6TR29 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR29 Pitch 3/4 Teeth 29 Outside Dia (mm) 18...

View full details
£51.04 - £51.04
£51.04
£51.04 - £51.04
£51.04
6tr28-pilot-bore-12b-3-4-pitch-sprocket

6TR28 (12B-3-28) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 28 Tooth

£48.20 - £48.20
£48.20
£48.20 - £48.20
£48.20

6TR28 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR28 Pitch 3/4 Teeth 28 Outside Dia (mm) 17...

View full details
£48.20 - £48.20
£48.20
£48.20 - £48.20
£48.20
6tr27-pilot-bore-12b-3-4-pitch-sprocket

6TR27 (12B-3-27) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 27 Tooth

£45.72 - £45.72
£45.72
£45.72 - £45.72
£45.72

6TR27 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR27 Pitch 3/4 Teeth 27 Outside Dia (mm) 17...

View full details
£45.72 - £45.72
£45.72
£45.72 - £45.72
£45.72
6tr26-pilot-bore-12b-3-4-pitch-sprocket

6TR26 (12B-3-26) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 26 Tooth

£42.96 - £42.96
£42.96
£42.96 - £42.96
£42.96

6TR26 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR26 Pitch 3/4 Teeth 26 Outside Dia (mm) 16...

View full details
£42.96 - £42.96
£42.96
£42.96 - £42.96
£42.96
6tr25-pilot-bore-12b-3-4-pitch-sprocket

6TR25 (12B-3-25) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 25 Tooth

£40.60 - £40.60
£40.60
£40.60 - £40.60
£40.60

6TR25 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR25 Pitch 3/4 Teeth 25 Outside Dia (mm) 16...

View full details
£40.60 - £40.60
£40.60
£40.60 - £40.60
£40.60
6tr24-pilot-bore-12b-3-4-pitch-sprocket

6TR24 (12B-3-24) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 24 Tooth

£37.01 - £37.01
£37.01
£37.01 - £37.01
£37.01

6TR24 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR24 Pitch 3/4 Teeth 24 Outside Dia (mm) 15...

View full details
£37.01 - £37.01
£37.01
£37.01 - £37.01
£37.01
6tr23-pilot-bore-12b-3-4-pitch-sprocket

6TR23 (12B-3-23) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 23 Tooth

£34.83 - £34.83
£34.83
£34.83 - £34.83
£34.83

6TR23 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR23 Pitch 3/4 Teeth 23 Outside Dia (mm) 14...

View full details
£34.83 - £34.83
£34.83
£34.83 - £34.83
£34.83
6tr22-pilot-bore-12b-3-4-pitch-sprocket

6TR22 (12B-3-22) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 22 Tooth

£30.93 - £30.93
£30.93
£30.93 - £30.93
£30.93

6TR22 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR22 Pitch 3/4 Teeth 22 Outside Dia (mm) 14...

View full details
£30.93 - £30.93
£30.93
£30.93 - £30.93
£30.93
6tr21-pilot-bore-12b-3-4-pitch-sprocket

6TR21 (12B-3-21) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 21 Tooth

£28.85 - £28.85
£28.85
£28.85 - £28.85
£28.85

6TR21 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR21 Pitch 3/4 Teeth 21 Outside Dia (mm) 13...

View full details
£28.85 - £28.85
£28.85
£28.85 - £28.85
£28.85
6tr19-pilot-bore-12b-3-4-pitch-sprocket

6TR19 (12B-3-19) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 19 Tooth

£24.57 - £24.57
£24.57
£24.57 - £24.57
£24.57

6TR19 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR19 Pitch 3/4 Teeth 19 Outside Dia (mm) 12...

View full details
£24.57 - £24.57
£24.57
£24.57 - £24.57
£24.57
6tr18-pilot-bore-12b-3-4-pitch-sprocket

6TR18 (12B-3-18) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 18 Tooth

£22.07 - £22.07
£22.07
£22.07 - £22.07
£22.07

6TR18 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR18 Pitch 3/4 Teeth 18 Outside Dia (mm) 11...

View full details
£22.07 - £22.07
£22.07
£22.07 - £22.07
£22.07
6tr17-pilot-bore-12b-3-4-pitch-sprocket

6TR17 (12B-3-17) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 17 Tooth

£19.80 - £19.80
£19.80
£19.80 - £19.80
£19.80

6TR17 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR17 Pitch 3/4 Teeth 17 Outside Dia (mm) 11...

View full details
£19.80 - £19.80
£19.80
£19.80 - £19.80
£19.80
6tr16-pilot-bore-12b-3-4-pitch-sprocket

6TR16 (12B-3-16) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 16 Tooth

£17.67 - £17.67
£17.67
£17.67 - £17.67
£17.67

6TR16 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR16 Pitch 3/4 Teeth 16 Outside Dia (mm) 105....

View full details
£17.67 - £17.67
£17.67
£17.67 - £17.67
£17.67
6tr14-pilot-bore-12b-3-4-pitch-sprocket

6TR14 (12B-3-14) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 14 Tooth

£13.84 - £13.84
£13.84
£13.84 - £13.84
£13.84

6TR14 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR14 Pitch 3/4 Teeth 14 Outside Dia (mm) 93.6...

View full details
£13.84 - £13.84
£13.84
£13.84 - £13.84
£13.84
6tr13-pilot-bore-12b-3-4-pitch-sprocket

6TR13 (12B-3-13) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 13 Tooth

£12.29 - £12.29
£12.29
£12.29 - £12.29
£12.29

6TR13 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR13 Pitch 3/4 Teeth 13 Outside Dia (mm) 87.5...

View full details
£12.29 - £12.29
£12.29
£12.29 - £12.29
£12.29
6tr12-pilot-bore-12b-3-4-pitch-sprocket

6TR12 (12B-3-12) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 12 Tooth

£12.39 - £12.39
£12.39
£12.39 - £12.39
£12.39

6TR12 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR12 Pitch 3/4 Teeth 12 Outside Dia (mm) 81.5...

View full details
£12.39 - £12.39
£12.39
£12.39 - £12.39
£12.39
6tr11-pilot-bore-12b-3-4-pitch-sprocket

6TR11 (12B-3-11) - BS Triplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 11 Tooth

£10.97 - £10.97
£10.97
£10.97 - £10.97
£10.97

6TR11 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-3 Triplex Chain Part Number 6TR11 Pitch 3/4 Teeth 11 Outside Dia (mm) 75 ...

View full details
£10.97 - £10.97
£10.97
£10.97 - £10.97
£10.97

Hi. Need any help?