Engineering Information
This page brings together every dimensional standard, reference chart and technical background article on the site in one place, drawn from BS, ISO, DIN and ASME sources and cross-referenced across metric, imperial, Unified and Whitworth systems wherever more than one is still in everyday use. Whether you're specifying a fastener, checking a fit, identifying a material, or just need to confirm a drawing convention, the categories below should get you to the right chart in one click. If you can't find what you're after, try the search or the full sitemap.
Please use the lists below to find the information you require.
FASTENERS
Bolt, nut and washer dimensions across Metric, Unified, Imperial (Whitworth/BSF) and British Association (BA) thread standards, together with grade markings, drive types, tightening torque data and cross-standard conversion references — everything needed to identify, specify or correctly replace a fastener.
- BOLTS - BA
- BOLTS - METRIC
- BOLTS - UNIFIED
- BOLTS - IMPERIAL
- NUTS - METRIC
- NUTS - IMPERIAL
- NUTS - UNIFIED
- WASHERS - METRIC
- WASHERS - IMPERIAL
- KM SERIES LOCK NUTS
- MB SERIES LOCK WASHERS
- BOLT GRADES AND MARKINGS
- FASTENER ABBREVIATIONS
- FASTENER TORQUE INFORMATION
- FASTENER STANDARDS INFORMATION
- FASTENER STANDARDS CONVERSION DIN - ISO/EN
- SCREW DRIVING TYPES
- SCREW HEAD TYPES
FLANGES AND PIPING SYSTEMS
Flange dimension tables spanning DN15 up to DN600, plus dimensional data for hygienic and stainless steel pipe fittings across the DIN, IDF, RJT and SMS standards commonly used in food, dairy, brewing and process piping installations.
GEOMETRY, SURFACE AND SYMBOLS
The drawing-office conventions behind engineering drawings: general and geometric tolerancing (GD&T), surface roughness and texture grades, first vs third angle orthographic projection, and standard welding symbol notation.
HARDWARE
Dimensional data for the smaller mechanical components that hold assemblies together, locate parts and transmit motion — bearings, circlips, keys, dowel pins, O-rings, rivets, roller chain and sprockets, set screws and V-belts.
- BEARING DIMENSION CHART
- CIRCLIPS - D1300 + D1400
- CIRCLIPS - N1300 + N1400
- HEAVY DUTY CIRCLIPS - D1460
- E CLIPS - D1500 + N1500
- PLAIN RINGS - M2300 + M2400
- DOWEL PIN DIMENSIONS
- KEYS - GIB HEAD
- KEYS - PARALLEL
- KEYS - TAPER
- KEYS - WOODRUFF
- O-RINGS
- RIVETS - COUNTERSUNK HEAD
- RIVETS - FLAT HEAD
- RIVETS - MUSHROOM HEAD
- RIVETS - RAISED COUNTERSUNK HEAD
- ROLLER CHAIN AND SPROCKET DIMENSIONS
- RIVETS - ROUND HEAD
- SET SCREWS
- VEE BELTS
LIMITS AND FITS
ISO limits and fits data for hole-basis and shaft-basis systems, bearing fit tolerances, and ISO tolerance bands — for specifying the right clearance, transition or interference fit between mating parts.
MACHINED ELEMENTS
Thread dimension charts across Metric, Imperial, Unified, Acme, trapezoidal and special thread forms, together with thread designation and cross-standard equivalent references, plus spline and O-ring groove dimensions for machined features.
MATERIALS
Cross-reference charts and physical property data for metals and plastics, along with material strength values, to help narrow down material selection or check a specification against an equivalent standard.
MISCELLANEOUS
Standalone reference tools that don't sit neatly under one heading — galvanic compatibility via the anodic index, G-code/M-code programming reference, hardness scale comparisons, IP ratings, the periodic table, RAL colour codes, SI unit conversions and spanner/socket/Allen key size charts.
METAL FINISHING
Surface treatment and coating processes for corrosion resistance, wear resistance and appearance, from anodising and black-oxidising to electroplating, galvanising, passivation and vacuum impregnation, alongside the ISO/DIN plating code reference used to specify them.
SECTION PROPERTIES
Dimensions and section properties for standard structural steel sections (SHS, RHS, CHS, RSA, universal beams and PFC) and NB pipe in both carbon steel and stainless steel, for structural and mechanical design calculations.
SHEET-METAL
Gauge-to-thickness conversion charts for sheet metal and wire, covering the various gauge standards (SWG, AWG, BWG and more) still referenced in older specifications and supplier catalogues.
TOOLING
Drill size charts and comparisons, twist drill dimensional data, and tap size/drilling charts for preparing clearance and tapping holes ahead of both machine and hand tapping.
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