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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.

6dr21-pilot-bore-12b-3-4-pitch-sprocket

6DR21 (12B-2-21) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 21 Tooth

£19.68 - £19.68
£19.68
£19.68 - £19.68
£19.68

6DR21 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR21 Pitch 3/4 Teeth 21 Outside Dia (mm) 136 O...

View full details
£19.68 - £19.68
£19.68
£19.68 - £19.68
£19.68
6dr20-pilot-bore-12b-3-4-pitch-sprocket

6DR20 (12B-2-20) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 20 Tooth

£18.34 - £18.34
£18.34
£18.34 - £18.34
£18.34

6DR20 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR20 Pitch 3/4 Teeth 20 Outside Dia (mm) 129.7 ...

View full details
£18.34 - £18.34
£18.34
£18.34 - £18.34
£18.34
6dr18-pilot-bore-12b-3-4-pitch-sprocket

6DR18 (12B-2-18) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 18 Tooth

£15.08 - £15.08
£15.08
£15.08 - £15.08
£15.08

6DR18 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR18 Pitch 3/4 Teeth 18 Outside Dia (mm) 118 O...

View full details
£15.08 - £15.08
£15.08
£15.08 - £15.08
£15.08
6dr17-pilot-bore-12b-3-4-pitch-sprocket

6DR17 (12B-2-17) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 17 Tooth

£13.42 - £13.42
£13.42
£13.42 - £13.42
£13.42

6DR17 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR17 Pitch 3/4 Teeth 17 Outside Dia (mm) 111.5 ...

View full details
£13.42 - £13.42
£13.42
£13.42 - £13.42
£13.42
6dr16-pilot-bore-12b-3-4-pitch-sprocket

6DR16 (12B-2-16) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 16 Tooth

£11.93 - £11.93
£11.93
£11.93 - £11.93
£11.93

6DR16 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR16 Pitch 3/4 Teeth 16 Outside Dia (mm) 105.5 ...

View full details
£11.93 - £11.93
£11.93
£11.93 - £11.93
£11.93
6dr15-pilot-bore-12b-3-4-pitch-sprocket

6DR15 (12B-2-15) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 15 Tooth

£10.56 - £10.56
£10.56
£10.56 - £10.56
£10.56

6DR15 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR15 Pitch 3/4 Teeth 15 Outside Dia (mm) 99.8 ...

View full details
£10.56 - £10.56
£10.56
£10.56 - £10.56
£10.56
6dr14-pilot-bore-12b-3-4-pitch-sprocket

6DR14 (12B-2-14) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 14 Tooth

£9.19 - £9.19
£9.19
£9.19 - £9.19
£9.19

6DR14 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR14 Pitch 3/4 Teeth 14 Outside Dia (mm) 93.6 ...

View full details
£9.19 - £9.19
£9.19
£9.19 - £9.19
£9.19
6dr10-pilot-bore-12b-3-4-pitch-sprocket

6DR10 (12B-2-10) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 10 Tooth

£5.74 - £5.74
£5.74
£5.74 - £5.74
£5.74

6DR10 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR10 Pitch 3/4 Teeth 10 Outside Dia (mm) 69 Ov...

View full details
£5.74 - £5.74
£5.74
£5.74 - £5.74
£5.74
6dr09-pilot-bore-12b-3-4-pitch-sprocket

6DR09 (12B-2-09) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 9 Tooth

£5.25 - £5.25
£5.25
£5.25 - £5.25
£5.25

6DR09 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR09 Pitch 3/4 Teeth 9 Outside Dia (mm) 62 Ove...

View full details
£5.25 - £5.25
£5.25
£5.25 - £5.25
£5.25
6dr08-pilot-bore-12b-3-4-pitch-sprocket

6DR08 (12B-2-08) - BS Duplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 8 Tooth

£4.47 - £4.47
£4.47
£4.47 - £4.47
£4.47

6DR08 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-2 Duplex Chain Part Number 6DR08 Pitch 3/4 Teeth 8 Outside Dia (mm) 57.6 O...

View full details
£4.47 - £4.47
£4.47
£4.47 - £4.47
£4.47
6sr95-pilot-bore-12b-3-4-pitch-sprocket

6SR95 (12B-1-95) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 95 Tooth

£140.87 - £140.87
£140.87
£140.87 - £140.87
£140.87

6SR95 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR95 Pitch 3/4 Teeth 95 Outside Dia (mm) 585.1 ...

View full details
£140.87 - £140.87
£140.87
£140.87 - £140.87
£140.87
6sr57-pilot-bore-12b-3-4-pitch-sprocket

6SR57 (12B-1-57) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 57 Tooth

£56.95 - £56.95
£56.95
£56.95 - £56.95
£56.95

6SR57 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR57 Pitch 3/4 Teeth 57 Outside Dia (mm) 355.4 ...

View full details
£56.95 - £56.95
£56.95
£56.95 - £56.95
£56.95
6sr45-pilot-bore-12b-3-4-pitch-sprocket

6SR45 (12B-1-45) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 45 Tooth

£41.63 - £41.63
£41.63
£41.63 - £41.63
£41.63

6SR45 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR45 Pitch 3/4 Teeth 45 Outside Dia (mm) 282.5 ...

View full details
£41.63 - £41.63
£41.63
£41.63 - £41.63
£41.63
6sr40-pilot-bore-12b-3-4-pitch-sprocket

6SR40 (12B-1-40) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 40 Tooth

£26.47 - £26.47
£26.47
£26.47 - £26.47
£26.47

6SR40 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR40 Pitch 3/4 Teeth 40 Outside Dia (mm) 251.3 ...

View full details
£26.47 - £26.47
£26.47
£26.47 - £26.47
£26.47
6sr39-pilot-bore-12b-3-4-pitch-sprocket

6SR39 (12B-1-39) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 39 Tooth

£25.50 - £25.50
£25.50
£25.50 - £25.50
£25.50

6SR39 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR39 Pitch 3/4 Teeth 39 Outside Dia (mm) 245.1 ...

View full details
£25.50 - £25.50
£25.50
£25.50 - £25.50
£25.50
6sr38-pilot-bore-12b-3-4-pitch-sprocket

6SR38 (12B-1-38) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 38 Tooth

£24.46 - £24.46
£24.46
£24.46 - £24.46
£24.46

6SR38 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR38 Pitch 3/4 Teeth 38 Outside Dia (mm) 245.1 ...

View full details
£24.46 - £24.46
£24.46
£24.46 - £24.46
£24.46
6sr37-pilot-bore-12b-3-4-pitch-sprocket

6SR37 (12B-1-37) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 37 Tooth

£23.58 - £23.58
£23.58
£23.58 - £23.58
£23.58

6SR37 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR37 Pitch 3/4 Teeth 37 Outside Dia (mm) 232.9 ...

View full details
£23.58 - £23.58
£23.58
£23.58 - £23.58
£23.58
6sr36-pilot-bore-12b-3-4-pitch-sprocket

6SR36 (12B-1-36) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 36 Tooth

£22.79 - £22.79
£22.79
£22.79 - £22.79
£22.79

6SR36 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR36 Pitch 3/4 Teeth 36 Outside Dia (mm) 226.8 ...

View full details
£22.79 - £22.79
£22.79
£22.79 - £22.79
£22.79
6sr35-pilot-bore-12b-3-4-pitch-sprocket

6SR35 (12B-1-35) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 35 Tooth

£21.95 - £21.95
£21.95
£21.95 - £21.95
£21.95

6SR35 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR35 Pitch 3/4 Teeth 35 Outside Dia (mm) 221 ...

View full details
£21.95 - £21.95
£21.95
£21.95 - £21.95
£21.95
6sr34-pilot-bore-12b-3-4-pitch-sprocket

6SR34 (12B-1-34) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 34 Tooth

£21.02 - £21.02
£21.02
£21.02 - £21.02
£21.02

6SR34 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR34 Pitch 3/4 Teeth 34 Outside Dia (mm) 214.6 ...

View full details
£21.02 - £21.02
£21.02
£21.02 - £21.02
£21.02
6sr33-pilot-bore-12b-3-4-pitch-sprocket

6SR33 (12B-1-33) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 33 Tooth

£20.29 - £20.29
£20.29
£20.29 - £20.29
£20.29

6SR33 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR33 Pitch 3/4 Teeth 33 Outside Dia (mm) 209.3 ...

View full details
£20.29 - £20.29
£20.29
£20.29 - £20.29
£20.29
6sr32-pilot-bore-12b-3-4-pitch-sprocket

6SR32 (12B-1-32) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 32 Tooth

£19.47 - £19.47
£19.47
£19.47 - £19.47
£19.47

6SR32 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR32 Pitch 3/4 Teeth 32 Outside Dia (mm) 203.3 ...

View full details
£19.47 - £19.47
£19.47
£19.47 - £19.47
£19.47
6sr29-pilot-bore-12b-3-4-pitch-sprocket

6SR29 (12B-1-29) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 29 Tooth

£16.70 - £16.70
£16.70
£16.70 - £16.70
£16.70

6SR29 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR29 Pitch 3/4 Teeth 29 Outside Dia (mm) 184.1 ...

View full details
£16.70 - £16.70
£16.70
£16.70 - £16.70
£16.70
6sr28-pilot-bore-12b-3-4-pitch-sprocket

6SR28 (12B-1-28) - BS Simplex Roller Chain Sprocket Pilot Bore 12B 3/4" - 28 Tooth

£15.96 - £15.96
£15.96
£15.96 - £15.96
£15.96

6SR28 Pilot Bore 12B 3/4" Pitch Sprocket For use with 12B-1 Simplex Chain Part Number 6SR28 Pitch 3/4 Teeth 28 Outside Dia (mm) 178 ...

View full details
£15.96 - £15.96
£15.96
£15.96 - £15.96
£15.96

Hi. Need any help?