Every reference chart and calculator on MLC, 35 of them, grouped by what you are
working on. The calculators run in the page - enter your numbers and read the answer, nothing to
download. The charts are full lookup tables, not samples.
All dimensional data follows the published standard for that subject: ISO 261 and ISO 898-1 for
metric threads, ISO 15 for bearing boundary dimensions, ISO 281 for bearing life, ISO 286 for
tolerances and fits, BS 1806 for O-rings, and ASME B36.10 for pipe schedules. Where a value is a
conversion rather than a standard, it is exact arithmetic - one inch is exactly 25.4 mm by the 1959
international agreement, so nothing on these pages is rounded except where a table says so.
Threads and fasteners
- Metric Thread Pitch Chart: M1.6 to M64 (ISO 261) (Chart)
From M1.6 to M64 covering ISO 261 and ISO 724 standards, includes tap drill sizes for both coarse and fine pitches.
- UNC and UNF Thread Sizes Chart (Chart)
UNC and UNF thread sizes from #4 to 1 inch.
- NPT Thread Sizes Chart: 1/16 to 24 inch, TPI, OD and Tap Drill (Chart)
NPT thread chart for 1/16 to 24 inch: threads per inch, pipe OD in inches and mm, pitch diameter, hand-tight engagement, thread length and tap drill sizes.
- Tap Drill and Clearance Hole Chart: Metric, UNC and UNF (Chart)
Tap drill and clearance hole sizes for metric M1.6 to M42 and imperial UNC and UNF, with the formula used to calculate every value.
- Bolt Head Sizes Chart: Metric Hex Bolts M1.6 to M64 (Chart)
Bolt head sizes for metric hex bolts M1.6 to M64: across flats, head height and nut height, plus socket cap screw head and key sizes.
- Spanner Size Chart: Metric Bolts M1.6 to M64 (ISO and DIN) (Chart)
For metric bolts and nuts M1.6 to M64: M8 13 mm, M10 16 mm, M12 18 mm, M16 24 mm, M36 55 mm.
- Allen Key Sizes Chart: Metric and Imperial Hex Keys in mm (Chart)
Allen key size chart for metric (ISO 4762) and imperial (ASME B18.3) socket screws, with every imperial hex key in mm.
- Torx Size Chart: T1 to T100 in mm, Screw Sizes and Torque (Chart)
T1 to T100: point-to-point recess size in mm (T20 3.95 mm, T25 4.5 mm, T30 5.6 mm), matching screw sizes and torque ranges.
- Washer Dimensions Chart: Metric Flat Washers M1.6 to M64 (Chart)
Metric flat washer dimensions to ISO 7089 and ISO 7093-1: inside diameter, outside diameter and thickness for M1.6 to M64.
Torque and load
- Bolt Torque Calculator - Metric (M3 to M39) (Calculator)
Free bolt torque calculator for metric bolts M3-M39.
- Metric Bolt Torque Chart: M3 to M39, Class 8.8, 10.9, 12.9 (Chart)
For M3 to M39 in property classes 8.8, 10.9 and 12.9, dry threads, with the formula, the preload basis and ISO 898-1 strength values.
- Friction Coefficient Chart: Typical Values by Material Pair (Chart)
Coefficient of friction chart: steel, cast iron, brass, PTFE, nylon and rubber pairs, static and kinetic, dry and lubricated - with the caveats that matter.
Bearings and power transmission
Seals, pipe and flow
Materials and tolerances
- ISO Tolerance Chart: H7, h6, g6 Limits and Fits (ISO 286) (Chart)
ISO 286 tolerance chart for holes and shafts 0 to 500 mm: H7, H8, h6, g6, k6, p6 and 26 more classes in micrometres, IT grades and a fit calculator.
- Hardness Conversion Chart: HRC, HRB, HB, HV + Tensile (Calculator)
HRC, HRB, HB, HV and tensile MPa, HV 100-940, with an interpolating converter.
- Rockwell Hardness Scales Chart: HRA, HRB, HRC and 27 More (Chart)
Indenter, preliminary and total test force for all 30 scales.
- Shore Hardness Chart: Shore A, D and OO Scales Explained (Chart)
Indenter and spring force for Shore A, B, C, D, O, OO and more, with typical values.
- Metal Strength Chart: Yield and Tensile Strength of 23 Metals (Chart)
Yield and tensile strength in MPa for 23 engineering metals, with the condition each applies to.
- Density of Metals Chart: 27 Engineering Metals in kg/m3 (Chart)
Steel 7,850, aluminium 2,700, stainless, brass, copper, titanium and 20+ more in kg/m3 and g/cm3, with quick weight arithmetic.
- Water Properties Chart: Density, Viscosity, Cp, 0-100 C (Chart)
Water properties 0-100 C: density, dynamic viscosity, specific heat and vapour pressure in one table, with the pump sizing and cavitation implications.
Unit conversion
Which one do you need?
If you are identifying a part you already have, start with a finder rather than a chart: the
bearing size finder takes a bore, outside diameter or
width, and the O-ring size finder takes a BS number or an
inside diameter. If you are specifying a new part, the charts are faster - they show the neighbouring
sizes at the same time, which is usually what you actually want to see.