BS ISO 4251-1:2019 Code designated diagonal tyres (ply rating marked series) for agricultural tractors, trailers and machines Tyre designation and dimensions, and approved rim contours

Size coding
Loading
Dimensional tolerances
Dimensions
Contour
Wheel rims
Numerical designations
Width
Radial-ply tyres
Tyres
Pneumatic tyres
Agricultural tractors
Marking
Velocity
Diameter
Height
Wheels
Radius
Preferred sizes
Agricultural equipment
Vehicle components

Link: BS ISO 4251-1:2019 Code designated diagonal tyres (ply rating marked series) for agricultural tractors, trailers and machines Tyre designation and dimensions, and approved rim contours
Source: BSI Standards

BS ISO 8533:2019 Glass-reinforced thermosetting plastics (GRP) pipes and fittings. Test methods to prove the design of cemented or wrapped joints

Diameter measurement
Plastics
Geometry
Thickness measurement
Dimensional measurement
Pipe fittings
Angular measurement
Pipes
Test equipment
Flanges
Pipework systems
Accuracy
Pipe couplings
Tolerances (measurement)

Link: BS ISO 8533:2019 Glass-reinforced thermosetting plastics (GRP) pipes and fittings. Test methods to prove the design of cemented or wrapped joints
Source: BSI Standards