Reference

Component Library

A standard library of 100+ parametric maker parts — insert, size, mate and re-use.

FlywheelCAD ships a standard library of everyday mechanical and electronic parts — fasteners, bearings, gears, motors, connectors, board footprints and mounts. Every part is a parametric component: pick it from a browser, choose a size, and it drops into your design ready to position and mate. Dimensions trace to a published standard or a common catalog part, so a bolt circle or a bearing bore is the real one.

FlywheelCAD's standard parts are parametric reconstructions from published engineering standards (ISO/DIN/ANSI); dimensions are factual specifications, not data reproduced from any vendor's catalog.

How the library works

Insert from a browser	Component → Insert from Library… opens a searchable browser with a live 3D preview. Enumerated parameters (size, thread, designation…) appear as drop-downs; lengths and diameters are free-entry. Press insert and the part is placed as a component instance.
Copy-on-use	Inserting a part vendors its module into your document under `lib/standard/`, so the document stays self-contained and travels with exactly the parts it uses. In a script the same part is just an import: `from lib.standard.bearings import bearing`.
Named anchors	Each part exposes named reference points — a stepper's `mount_face` and `bolt_0..3`, a bearing's `face_a`. Mate to them (`cad.mate_coincident(part, "face_a", plate.hole_0)`) and the part follows when the target moves.
Parametric & memoized	Ask for an M3×12 and an M4×20 and you get two components; ask for a size you already used and it is reused, not rebuilt. Every factory also takes a `quality` preset (`preview` / `standard` / `high` / `ultra`) controlling mesh resolution.

Scripting a part: each factory takes cad first, then its parameters, and returns a component you instance. The tables below list every factory and its parameters (drop-down choices are shown inline).

from flywheelcad import *
cad = FlywheelCAD()
from lib.standard.bearings import bearing
from lib.standard.fasteners import cap_screw

b = bearing(cad, designation="608")          # a component
brg = cad.instance(b, translate=(0, 0, 0))   # placed in the assembly
screw = cad.instance(cap_screw(cad, thread="M3", length=10))

Motion & power transmission

Motors, bearings, gears, belts, springs and the linkages that tie them together.

`steppers` 1 part

NEMA stepper motors (square & round bodies)

Factory	What it is	Parameters
`stepper`	A NEMA stepper motor with catalog-style detailing.	`size` 8 · 11 · 14 · 17 · 23 · 34 `length` optional `shaft_length` optional `body` square · round

`servos` 2 parts

Hobby servos and matching control horns

Factory	What it is	Parameters
`servo`	A hobby servo: case, mounting flange with screw holes, gear-head	`size` sub_micro · micro · standard · large
`horn`	A servo control horn (arm) with linkage holes.	`style` single · double · cross · disc `spline` micro · standard · large `length` optional

`bearings` 1 part

Deep-groove ball bearings (ISO 15), plain and flanged

Factory	What it is	Parameters
`bearing`	A deep-groove ball bearing (see module docstring for designations).	`designation` 623 · 624 · 625 · 626 · 608 · 688 · 6000 · 6001 · 6800 · 6801 · 6900 · 6902 `flanged` (False)

`bearings_more` 4 parts

Thrust, sleeve, needle and 2-bolt flange bearings

Factory	What it is	Parameters
`thrust_bearing`	A single-direction thrust ball bearing: one continuous annular ring	`designation` 51100 · 51101 · 51102 · 51103
`bushing`	A sleeve/sintered-bronze bushing: an annular tube, axis +Z, z=0..length.	`bore` (8.0) `od` (10.0) `length` (10.0) `style` plain · flanged
`needle_bearing`	A drawn-cup needle roller bearing: a thin-wall annular shell, axis	`designation` HK0608 · HK0810 · HK1010 · HK1210
`flange_bearing`	A 2-bolt diamond-flange mounted bearing unit (KFL series): a	`size` KFL08 · KFL10

`motion` 5 parts

LM linear bearings, GT2 pulleys, lead screws and couplings

Factory	What it is	Parameters
`lm_bearing`	An LM____UU linear ball bearing: an annular tube with a shallow	`model` LM6UU · LM8UU · LM10UU · LM12UU
`gt2_pulley`	A GT2 (2 mm pitch) timing pulley: two flange disks around a central	`teeth` (20) `bore` (5.0)
`leadscrew`	A trapezoidal lead screw at its nominal major diameter (thread	`size` TR8x2 · TR8x8 · TR10x2 · TR12x3 `length` (200.0)
`leadscrew_nut`	A brass flanged lead-screw nut: a flanged, through-bored cylinder	`size` TR8 · TR10 · TR12
`shaft_coupling`	An aluminium shaft coupling: outer Ø 25, length 30, with a stepped	`style` rigid · flexible `bore_a` (5.0) `bore_b` (8.0)

`transmission` 5 parts

Roller-chain sprockets, V-belt/idler pulleys, belts, worms

Factory	What it is	Parameters
`sprocket`	A roller-chain sprocket: a flat disc (thickness 4) at the chain's	`teeth` (16) `chain` #25 · #35 · #40 `bore` (8.0)
`v_pulley`	A V-belt pulley: an annular disc (width 12) with a single-V groove	`od` (40.0) `bore` (8.0)
`idler_pulley`	A smooth belt idler/tensioner wheel: two flange lips (dia od+3)	`od` (18.0) `bore` (3.0)
`timing_belt`	A GT2 timing-belt loop shown as a thin closed racetrack band (teeth	`length` (200.0) `width` (6.0)
`worm`	A worm-drive worm: a plain cylindrical blank (dia od, `length`) with	`length` (30.0) `od` (12.0) `bore` (6.0)

`gears` 3 parts

Involute spur and helical gears, plus a matching rack

Factory	What it is	Parameters
`spur_gear`	An involute spur gear. teeth (>=8), module (mm), thickness (face width),	`teeth` (20) `module` (2.0) `thickness` (6.0) `bore` (5.0) `pressure_angle` 14.5 · 20.0 · 25.0
`helical_gear`	An involute helical gear: the spur profile swept along a helix via the	`teeth` (20) `module` (2.0) `thickness` (8.0) `bore` (5.0) `helix_angle` (20.0) `hand` right · left `pressure_angle` 14.5 · 20.0 · 25.0
`gear_rack`	A straight involute-equivalent gear rack (the tooth strip a spur gear	`teeth` (12) `module` (2.0) `thickness` (8.0)

`springs` 3 parts

Compression, extension and torsion springs

Factory	What it is	Parameters
`compression_spring`	A helical compression spring (open-pitch coils). Anchors: bottom (z=0),	`coils` (6) `wire_d` (1.5) `outer_d` (12.0) `free_length` (25.0)
`extension_spring`	A helical extension spring: close-wound body coils plus a loop at each	`coils` (8) `wire_d` (1.2) `outer_d` (10.0)
`torsion_spring`	A helical torsion spring: body coils plus two tangential legs. Anchors:	`coils` (5) `wire_d` (1.5) `outer_d` (12.0) `leg_length` (20.0)

`linear_motion` 5 parts

Ball screws, turntable bearings, cam followers, gearmotors

Factory	What it is	Parameters
`ball_screw`	A ball screw shaft at its nominal major diameter (thread cosmetic --	`size` SFU1204 · SFU1605 · SFU2005 `length` (200.0)
`turntable_bearing`	A lazy-susan / slewing turntable bearing, represented as a short	`size` 100mm · 150mm
`cam_follower`	A cam follower / track roller: a threaded stud (dia `bore`, 12mm	`bore` (6.0) `roller_d` (16.0)
`encoder_wheel`	An optical encoder disc: a thin disc (dia `od`, 1.5mm thick, bored	`slots` (20) `od` (40.0) `bore` (5.0)
`dc_gearmotor`	A small DC gear motor: a gearbox (rectangular for N20, round for	`size` N20 · 37D

`linkage` 3 parts

RC ball links, clevises and pushrods

Factory	What it is	Parameters
`ball_link`	A ball link (rod end): threaded shank into a housing that swivels	`thread` M2 · M3
`clevis`	A clevis (fork) link: threaded shank into a forked end with a	`thread` M2 · M3
`pushrod`	A plain pushrod (threaded ends implied). Runs z = 0 → length.	`diameter` (2.0) `length` (80.0)

Fasteners & hardware

Metric fasteners traceable to ISO / DIN standards, plus the negative bodies that cut their holes.

`fasteners` 5 parts

Cap screws, hex nuts, washers and clearance/tap hole-cutters

Factory	What it is	Parameters
`cap_screw`	A DIN 912 socket head cap screw.	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8 `length` (12.0) `threads` cosmetic · real
`hex_nut`	An ISO 4032 hex nut. Anchors: bottom (z=0), top. Flats face ±Y.	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8
`washer`	An ISO 7089 flat washer. Anchors: bottom (z=0), top.	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8
`clearance`	NEGATIVE body: an ISO 273 medium-fit clearance volume to subtract.	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8 `length` (12.0) `head_pocket` (False)
`tap`	NEGATIVE body: a tap-drill volume (for threads cut into the part).	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8 `length` (10.0)

`fasteners_more` 6 parts

Countersunk / button / grub screws, heat-set inserts, standoffs, threaded rod

Factory	What it is	Parameters
`countersunk`	An ISO 10642 flat (countersunk) socket-head screw.	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8 `length` (12.0)
`button_head`	An ISO 7380 button (dome) head socket screw.	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8 `length` (12.0)
`grub_screw`	An ISO 4026 socket set (grub) screw: a headless threaded cylinder with	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8 `length` (6.0) `threads` cosmetic · real
`heatset_insert`	A tapered brass heat-set threaded insert (press-in, for 3D prints).	`thread` M2 · M2.5 · M3 · M4 · M5
`standoff`	A hex brass standoff. Anchors: base (z=0), top (z=length); a male-female	`thread` M2 · M2.5 · M3 · M4 · M5 `length` (15.0) `gender` female-female · male-female
`threaded_rod`	Threaded rod / studding at the nominal major diameter. Stands up +Z.	`thread` M2 · M2.5 · M3 · M4 · M5 · M6 · M8 `length` (60.0) `threads` cosmetic · real

`fasteners_hardware` 5 parts

Flange & acorn nuts, rivnuts, shoulder screws, lock washers

Factory	What it is	Parameters
`flange_nut`	An ISO 4161 serrated hex flange nut (serrations cosmetic).	`thread` M4 · M5 · M6 · M8 · M10
`acorn_nut`	A DIN 1587 domed acorn (cap) nut: a blind-bored hex base capped by a	`thread` M4 · M5 · M6 · M8 · M10
`rivnut`	A blind rivet-nut / threaded insert: a flange disc atop a knurled	`thread` M4 · M5 · M6 · M8 · M10
`shoulder_screw`	An ISO 7379 shoulder (stripper) screw: a precision shoulder followed	`shoulder_d` 6 · 8 · 10 · 12 `length` (20.0)
`lock_washer`	A lock washer: "split" (DIN 127 spring ring, approximated as an	`thread` M3 · M4 · M5 · M6 · M8 · M10 `style` split · external_tooth · internal_tooth

`fasteners_pins` 6 parts

Dowel / spring / clevis / cotter pins, E-clips, retaining rings

Factory	What it is	Parameters
`dowel_pin`	An ISO 2338 hardened dowel pin (h8 tolerance): a plain cylinder with	`diameter` (5.0) `length` (16.0)
`spring_pin`	An ISO 8752 slotted spring (roll) pin: a rolled tube (wall ~0.12 x	`diameter` (4.0) `length` (20.0)
`e_clip`	A DIN 6799 E-clip (external retaining ring): a flat annulus sized for	`shaft` (6.0)
`retaining_ring`	A DIN 471 (external, sprung onto a shaft) / DIN 472 (internal,	`bore` (20.0) `kind` internal · external
`clevis_pin`	An ISO 2341 clevis pin: a cylindrical shank with a flat head at one	`diameter` (5.0) `length` (20.0)
`cotter_pin`	An ISO 1234 / DIN 94 split (cotter) pin, simplified as a single	`diameter` (3.2) `length` (40.0)

`fasteners_rigging` 6 parts

Eye & U-bolts, thumb / self-tapping screws, wing & coupling nuts

Factory	What it is	Parameters
`eye_bolt`	A DIN 444-style lifting eye bolt: a threaded shank topped by a round	`thread` M4 · M5 · M6 · M8 · M10
`u_bolt`	A U-bolt: two vertical threaded legs joined by a semicircular bend.	`thread` M4 · M5 · M6 · M8 · M10 `width` (30.0) `height` (50.0)
`thumb_screw`	A knurled thumb screw (hand-tightening fastener): a flat knurled	`thread` M3 · M4 · M5 · M6 · M8 `length` (12.0)
`coupling_nut`	A long coupling nut (DIN 6334-style): a hex prism with a through	`thread` M4 · M5 · M6 · M8 · M10
`wing_nut`	A wing nut (DIN 315-style butterfly nut): a bored cylindrical body	`thread` M4 · M5 · M6 · M8 · M10
`self_tapping_screw`	A self-tapping / wood screw: a flat head flush at z = 0, tapering	`diameter` (4.0) `length` (16.0)

Electronics & enclosure

Through-hole parts, connectors, breakout-board footprints and panel controls to design cases around.

`electronics` 5 parts

LEDs, tactile buttons, 0.1" headers, barrel jacks, cooling fans

Factory	What it is	Parameters
`led`	A through-hole LED. size: "3mm" or "5mm".	`size` 3mm · 5mm
`tact_button`	A tactile push button. size: "6mm" or "12mm".	`size` 6mm · 12mm
`header`	A 0.1" (2.54mm pitch) pin header. pins: count per row (free text);	`pins` (4) `rows` 1 · 2
`barrel_jack`	A PCB-mount DC barrel jack (5.5x2.1mm class).	—
`fan`	A square cooling fan. size: "40mm", "60mm", "80mm", or "120mm".	`size` 40mm · 60mm · 80mm · 120mm

`electronics_more` 5 parts

Buzzers, heat sinks, fuse holders, LED matrices, Pi HATs

Factory	What it is	Parameters
`buzzer`	A through-hole piezo buzzer can (see module docstring for dims).	`kind` active · passive
`heat_sink`	An extruded aluminium heat sink (see module docstring for dims).	`style` TO220 · RPi
`fuse_holder`	A panel/PCB fuse-clip holder for a 5x20 mm fuse (see module	—
`led_matrix`	An LED matrix / display module (see module docstring for dims).	`size` 8x8 · MAX7219
`rpi_hat`	A Raspberry Pi HAT/shield footprint board (see module docstring	—

`connectors` 5 parts

USB, JST, Dupont, screw terminal blocks, panel jacks

Factory	What it is	Parameters
`usb`	A USB receptacle shell: an outer metal shell block minus a mouth	`kind` A · C · micro
`jst`	A JST-XH style 2.5mm-pitch wire-to-board header. White nylon housing	`pins` (2)
`dupont`	A Dupont/"berg" 2.54mm female housing: black nylon shell	`pins` (1) `rows` 1 · 2
`terminal_block`	A screw terminal block, 5.08mm pitch: green body (5.08*ways) long x	`ways` (2)
`barrel_jack_panel`	A panel-mount DC barrel jack, simplified as an on-axis (+Z) stack: a	—

`modules` 5 parts

OLED, stepper-driver, buck-converter and battery-holder boards

Factory	What it is	Parameters
`oled_display`	A small OLED display breakout module.	`size` 0.96 · 1.3
`relay_module`	A multi-channel relay breakout board (generic Songle SRD-05VDC-SL-C	`channels` (1)
`stepper_driver`	An A4988/DRV8825-class stepper driver carrier board (Pololu-style	`kind` A4988 · DRV8825
`buck_converter`	A mini buck (step-down) converter module (MP1584EN-class). PCB	—
`battery_holder`	A battery holder. cell "18650": box (count*19.5 + 3) x 72 x 20 mm	`cell` AA · 18650 · CR2032 `count` (1)

`board_footprints` 5 parts

Arduino, Raspberry Pi and ESP32 board footprints

Factory	What it is	Parameters
`arduino_uno`	An Arduino Uno R3-footprint board: PCB outline, the 4 real mounting	—
`arduino_nano`	An Arduino Nano-footprint board: PCB outline, 4 corner mounting	—
`raspberry_pi`	A Raspberry Pi-footprint board: PCB outline, the 4 real mounting	`model` 3B · 4B · Zero
`esp32_devkit`	An ESP32 DevKit-footprint board: PCB outline, two 15-pin header	—
`pcb_standoff`	A nylon PCB support/board-mount spacer: a round spacer body (dia	`height` (6.0)

`switches` 5 parts

Rocker / toggle / slide switches, potentiometers, rotary encoders

Factory	What it is	Parameters
`rocker_switch`	A KCD1-class panel rocker switch (21x15mm cutout).	—
`toggle_switch`	A mini toggle switch (MTS-101 class).	—
`slide_switch`	An SPDT slide switch.	—
`potentiometer`	A WH148 / Alpha-class 9mm panel potentiometer.	`shaft` round · d_flat · knurled
`rotary_encoder`	An EC11-class rotary encoder with pushbutton.	—

Structural, fluid & mounts

Framing, magnets, pneumatics and the brackets that bolt everything down.

`extrusions` 1 part

T-slot aluminium extrusion rails (20/30/40 series)

Factory	What it is	Parameters
`rail`	A T-slot extrusion rail.	`profile` 2020 · 2040 · 4020 · 2060 · 3030 · 3060 · 4040 · 4080 `length` (100.0)

`mounts` 5 parts

VESA plates, tripod bosses, caster wheels, piano hinges, cable clips

Factory	What it is	Parameters
`vesa_mount`	A VESA (FDMI) monitor-mount adapter plate: a square plate with a	`pattern` 75 · 100 · 200
`tripod_mount`	A 1/4"-20 camera/tripod mounting boss: a 30x30x4mm backing plate	—
`caster_wheel`	A V-groove skate/V-slot caster wheel: an annular revolve with a	`diameter` (24.0) `bore` (8.0)
`piano_hinge`	A continuous ("piano") hinge: two flat leaves (each 15mm wide x	`length` (100.0)
`cable_clip`	A cable saddle / P-clip: a block (width cable_d+8, depth cable_d+4,	`cable_d` (6.0)

`magnets_misc` 3 parts

Neodymium magnets, rubber feet, panel grommets

Factory	What it is	Parameters
`magnet`	A neodymium magnet. shape: "disc" (solid cyl), "ring" (annular, uses	`shape` disc · ring · block `diameter` (10.0) `bore` (0.0) `thickness` (3.0)
`rubber_foot`	A rubber bumper foot: a truncated cone with a central screw through-hole.	`size` small · medium · large
`grommet`	A rubber panel grommet (spool): flanges grip a panel of `thickness`	`panel_bore` (8.0) `thickness` (1.5)

`pneumatics` 5 parts

Push-fit bowden fittings, hose barbs, O-rings, cable glands

Factory	What it is	Parameters
`pneumatic_fitting`	A PC-series push-to-connect bowden fitting: threaded base (-Z) + hex	`size` PC4-M6 · PC4-M10 · PC6-M6
`bowden_coupler`	An inline PC4-class tube-to-tube coupler: two collet bodies back to	`tube_od` (4.0)
`hose_barb`	A barbed hose-to-thread adapter: threaded base (-Z) + hex + a barbed	`hose_id` (6.0) `thread` M6 · M8 · G1_4
`o_ring`	An elastomer O-ring: a torus (AS568/ISO 3601 sizing convention —	`inner_d` (10.0) `cross_d` (2.0)
`cable_gland`	A metric/PG-thread cable gland: threaded body (-Z) + hex + a domed	`size` M12 · M16 · PG7 · PG9

Component Library

How the library works

Motion & power transmission

steppers 1 part

servos 2 parts

bearings 1 part

bearings_more 4 parts

motion 5 parts

transmission 5 parts

gears 3 parts

springs 3 parts

linear_motion 5 parts

linkage 3 parts

Fasteners & hardware

fasteners 5 parts

fasteners_more 6 parts

fasteners_hardware 5 parts

fasteners_pins 6 parts

fasteners_rigging 6 parts

Electronics & enclosure

electronics 5 parts

electronics_more 5 parts

connectors 5 parts

modules 5 parts

board_footprints 5 parts

switches 5 parts

Structural, fluid & mounts

extrusions 1 part

mounts 5 parts

magnets_misc 3 parts

pneumatics 5 parts

`steppers` 1 part

`servos` 2 parts

`bearings` 1 part

`bearings_more` 4 parts

`motion` 5 parts

`transmission` 5 parts

`gears` 3 parts

`springs` 3 parts

`linear_motion` 5 parts

`linkage` 3 parts

`fasteners` 5 parts

`fasteners_more` 6 parts

`fasteners_hardware` 5 parts

`fasteners_pins` 6 parts

`fasteners_rigging` 6 parts

`electronics` 5 parts

`electronics_more` 5 parts

`connectors` 5 parts

`modules` 5 parts

`board_footprints` 5 parts

`switches` 5 parts

`extrusions` 1 part

`mounts` 5 parts

`magnets_misc` 3 parts

`pneumatics` 5 parts