3 disciplines13 families

Mechanical Parts

Bearings, gears, springs, drives and the other parts that a fastener holds together — grouped by discipline, with the designation system each family is specified in.

How this section is being builtread this before expecting dimension tables

Fasteners in this database go all the way down to one page per size — 2,273 of them, each with a full nominal dimension table. Mechanical parts are not there yet, and the honest thing is to say so rather than to publish pages that look complete and are not.

What follows is the taxonomy: the families a component database has to cover, and the designation system each one is specified in. Where a family already has a home on this site the card links to it; where it does not, the card is marked planned and does not pretend to be clickable.

Each card carries a drawing of one representative designation, with the parameters that designation is actually made of dimensioned on it — bore and outside diameter on a 6205 bearing, pitch on 08B chain, the pitch circle on a gear. These are schematics, not derived geometry: unlike the fastener pages, nothing here is computed from a nominal dimension table, because there is no table yet.

MechanicalPower transmission and motion components

6 families
Schematic front view of a deep-groove ball bearing with bore and outside diameter dimensionedØ D 52Ø d 25
6205d 25 · D 52 · B 15 mm
PlannedBearingsRolling-element bearings are identified by a designation such as 6205, where the digits encode the boundary dimensions. Bore, outer diameter and width are standardised in ISO 15.
Schematic face view of a spur gear with the pitch circle dimensionedØ 40z 14
m 2 · z 14pitch Ø 40 · α 20°
PlannedGearsSpur, helical, bevel and worm gears, specified by module, tooth count and pressure angle — the three numbers that decide whether a pair will mesh.
Schematic side view of a compression spring with free length dimensionedD 20L0 50wire d 2.0
L0 50wire 2.0 · D 20 mm
PlannedSpringsCompression, extension and torsion springs, specified by wire diameter, free length, spring rate and end condition.
Schematic side view of a roller chain link with pitch dimensionedp 12.70roller
08Bp 12.70 · ANSI 40
PlannedChain & sprocketsRoller chain is identified by pitch — 08B on the European system, 40 on the ANSI one — with matching sprockets specified by tooth count and bore.
Section through a V-belt pulley groove with the belt seated in itbelt 12.7Wgroove 38°
SPA · 1 groovedatum Ø 100 mm
PlannedPulleys & beltsV-belt and timing pulleys, specified by groove profile, pitch diameter and number of grooves.
Schematic of a stepped shaft with a coupling, diameter dimensionedØ 25coupling Lkeyway
Ø 25 h6coupling 12 N·m
PlannedShafts & couplingsShafting is specified by diameter, tolerance and material; couplings by torque rating and the misalignment they will absorb.

ElectricalConnectors and control components

4 families
Schematic of a five-pole pluggable terminal block with pitch dimensionedp 5.08L
p 5.082–24 poles
PlannedConnectorsPluggable and terminal connectors, specified by pole count, pitch, current rating and ingress protection.
Schematic of a rocker switch with the panel cutout dimensioned19.213.0rocker
SPDTcutout 19.2 × 13.0
PlannedSwitchesRocker, toggle, pushbutton and limit switches, specified by contact configuration and switching current.
Schematic of an M12 inductive proximity sensor showing the switching distanceSn 4M12 × 1
M12 × 1Sn 4 mm · 10–30 V DC
PlannedSensorsProximity, photoelectric and temperature sensors, specified by sensing range, output type and supply voltage.
Schematic side view of an induction motor with shaft diameter dimensionedframe LØ 24
frame 90S1.1 kW · 4-pole
PlannedMotorsAC induction and DC motors, specified by frame size, power, speed and mounting arrangement.

PlumbingFluid handling components

3 families
Axial section of a pipe showing outside diameter and nominal boreOD 33.7DN 25wall 3.2
DN 25OD 33.7 · wall 3.2
PlannedPipes & tubesNominal bore and outside diameter are different systems and must not be interchanged — the wall thickness that goes with each is standardised separately.
Schematic of a ball valve showing the ball, bore and leverDN 20PN 16
DN 20PN 16
PlannedValvesBall, gate, globe and check valves, specified by connection size, pressure rating and body material.
Section through a 90 degree threaded elbow90°G 1/2G 1/2
G 1/290° equal elbow
PlannedFittingsElbows, tees, reducers and adaptors, specified by connection type, size and pressure rating.

Where the depth already is

FastenersScrews, bolts, nuts and washers — 2,273 specification pages, each with a full nominal dimension table.Open →MaterialsMetals, wood and plastics with density, applications and the property classes each is supplied in.Open →ToolsWeight and tightening-torque calculators, plus a thread identifier that works from caliper readings.Open →