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SKU: 12B2-31
Pilot Bore Duplex Sprockets
12B2-31 3/4″ Duplex P/B Sprocket
£116.52
ex. VAT · £139.82 inc. VAT
JS9 Tight Fit Anti-Roll
H7 Precision Transition Fit
ISO 9001 Quality Assured
Technical Specifications
Chain Size
12B
Pitch
3/4"
Teeth
31
Outer Dia (de)
98.3
Pitch Dia (dp)
94.15
Duplex Hub Dia (dm)
80
Duplex Length thro' Bore A
30
Duplex Stock Bore D34
16
Type
1
Weight
7.59kg
Standards & Fit
JS9
JS9 Keyway
Tight fit anti-roll standard
H7
Precision Transition Fit
Precision bore fit
ISO
ISO 9001:2015
Quality Assured
| Parameter | Value | Notes |
|---|---|---|
| SKU | 12B2-31 | Aroflex part number |
| Chain Size | 12B | |
| Pitch | 3/4" | |
| Teeth | 31 | |
| Outer Dia (de) | 98.3 | |
| Pitch Dia (dp) | 94.15 | |
| Duplex Hub Dia (dm) | 80 | |
| Duplex Length thro' Bore A | 30 | |
| Duplex Stock Bore D34 | 16 | |
| Type | 1 | |
| Weight | 7.59 kg | |
| Bore Tolerance | H7 | Precision transition fit |
| Material | Steel / Friction disc | Standard construction |
| Certification | ISO 9001:2015 | Quality assured |
12B2-31 3/4″ Duplex Pilot Bore Sprocket
The 12B2-31 is a precision-manufactured 31-tooth Duplex Pilot Bore Sprocket designed for BS 12B roller chain with a 3/4″ pitch. Built to BS/ISO standards, this sprocket is ideal for heavy-duty power transmission applications across industrial machinery. Supplied with a pilot bore, it is ready for finish-boring and keying to your exact shaft dimensions, offering maximum installation flexibility.
Product Features & Specifications
- Number of Teeth: 31
- Chain Standard: BS 12B (3/4″ pitch) — Duplex (2-strand)
- Outer Diameter (de): 98.3 mm
- Pitch Diameter (dp): 94.15 mm
- Hub Diameter (dm): 80 mm
- Length Through Bore (A): 30 mm
- Stock Bore (D1): 16 mm
- Bore Type: Pilot Bore — supplied with a small pilot bore, ready to be finish-bored and keyed to your exact shaft specification.
- Machining Service: Need a finished bore and keyway? Use our In-House Machining Services for a precision-finished sprocket to your exact specification.
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