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OSBM Bolt 
OSBM Bolt on concrete block, N side of Sutton Cross, S side of road, Ailsworth.
Location
Grid reference: TL 1075 9886.
Landranger 142: Peterborough, Market Deeping & Chatteris.
Structure: Concrete block.
Waypoint: OS0686.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Castor,
2.43km to the east.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales, and was levelled with a height of 49.5950 feet [15.1166 metres] above mean sea level (Newlyn datum). It was included on the Castor to Cranford and Castor to Waltham on the Wolds levelling lines. The surveyor's description was OSBM Bolt on concrete block, N side of Sutton Cross, S side of road, Ailsworth.
Location
Grid reference: TL 1075 9886.
Landranger 142: Peterborough, Market Deeping & Chatteris.
Structure: Concrete block.
Waypoint: OS0686.
Neighbouring Flush Brackets
| 1035 | Ailsworth 1.01km to the east. |
| 1036 | Sutton, The Laurels 1.12km to the west. |
| 1037 | Sutton Toll 1.78km to the west. |
| 1034 | Castor, High Street 1.83km to the east. |
| 1945 | Wansford, Tunnel House 2.69km to the southwest. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales, and was levelled with a height of 49.5950 feet [15.1166 metres] above mean sea level (Newlyn datum). It was included on the Castor to Cranford and Castor to Waltham on the Wolds levelling lines. The surveyor's description was OSBM Bolt on concrete block, N side of Sutton Cross, S side of road, Ailsworth.
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