227 semis rigid 3d models found
Download or buy, then render or print from the shops or marketplaces.
3D Models below are suitable not only for printing but also for any
computer graphics like CG, VFX, Animation, or even CAD. You can print these 3d models on
your favorite 3d printer or render them with your preferred render engine.
Please note that the 3D model database is only a Search Engine. You should
visit the original websites. Most of the models can be easily imported and rendered
with Autodesk 3ds Max, Maya, Blender, C4D, and Sketchup. Check for online
3d model conversions tools for your file format.
Shown 1 of
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3d_export
$12
Semi Rigid Rubberduck 3D Model
... tender yacht marine boat rigid bottom inflatable dinghy run-around 38m
semi rigid rubberduck 3d model southdesign 32727 3dexport
3d_export
$10
helicopter robinson r44
...seating for a pilot and three passengers, a semi-rigid two-bladed main rotor and a two-bladed tail rotor and a skid landing gear.
thingiverse
free
Attache pour bâche de semi-rigide Bombard Explorer by TonyJ
...d explorer by tonyj
thingiverse
attache pour bâche de semi-rigide bombard explorer
a droite l'originale a gauche la création
thingiverse
free
GoPro Lens Protector for semi flexible/rigid materials (REAL Bioflex) by gerdfranz
... materials (real bioflex) by gerdfranz
thingiverse
fits perfectly onto a gopro 3 and has a lug for extra securing the protector.
thingiverse
free
Xiaomi Yi Lens protector for semi rigid/flexible material (REAL Bioflex) by gerdfranz
...material (real bioflex) by gerdfranz
thingiverse
fits perfectly onto a xiaomi yi and has a lug for extra securing the protector.
thingiverse
free
Semi rigid UHF dipole SMA mount. by iPeel
...d glue it to the sma socket with ca glue, it helps to file a little away from the sides of the sma plug to get a good glue joint.
thingiverse
free
Adaptive Grippers by Juanmgan11
...mgan11
thingiverse
the semi-rigid finger has to be printed in pla, whereas the flexible has to be printed with flexble filament.
thingiverse
free
Pokemon Card Holder/Display by AYSchweizer
...lder/display by ayschweizer
thingiverse
card holder to display cards. sized to fit cards in ultra pro 5x3 semi rigid protectors.
thingiverse
free
Leica Square Lens cap for 28 35mm hood
...is no longer available from leica.
i have printed in ninjaflex semi rigid and it prints ok and functions exactly as the original.
thingiverse
free
Adjustable Laptop Stand by DuduDiY
...slight flexibility), and the pads and supports (white) are in semi-rigid filaments.
four metallic 2.2 mm rods are used as hinges.
thingiverse
free
Realacc X210 (Lumenier QAV-X) Actioncam mount (Xiaomi Yi) by gerdfranz
... if it doesn't (due to different filament, printer calibration), scale down the object for 0,xx%. the holes still should fit.
thingiverse
free
Pod for Karearea Talon V2 by evret
...signed with strong semi rigid print material in mind like polycarbonate (pictured) or nylon.
may need to be made thicker for tpu.
thingiverse
free
eken H9 cage by alpinedrones
...erial like soft pla, ninjaflex or tpu. print front facing down.
in my case the cage weighs 25g, so exactly 50% of the stock case.
thingiverse
free
iPhone 4 iTronic Case Updated by yoyoweb
...e-updated.html
or herehttp://www.sculpteo.com/en/design/iphone-4-itronic-case-updated-1/tza9jnqr?uuid=8l670ch4yk1rakluqvrwrb#tab=
3dbaza
$5
HYSTEROSCOPE MGB Endoskopische Geräte (115330)
...hafts with handle or without handle semi-rigid manual instruments; forceps, punches, scissors hf-electrodes: button, loop, needle
thingiverse
free
Toner cap for Phaser 3100 by thelongrunsmoke
...ment, like sbs, nylon or hard flex.
do not use pla or abs, because it's be a difficult to extract rigid cap from a container.
thingiverse
free
Realacc X210 (Lumenier QAV-X) Actioncam mount by gerdfranz
...le bit nicer with support.
not sure if this will fit the lumenier qav-x? just tested in on the realacc x210 from banggood.
enjoy.
thingiverse
free
Diatone Crusader GT2 Antenna & Cam Mount by Chris_Toast
...or mobius type action camera. slip fit design guides over the housing bracket assembly and is snug when made with semi-rigid tpu.
thingiverse
free
Bag Cutter by mtingen
...a is sealed off, pause the print, insert the blade, and ensure it sits flush to the rest of the print so the nozzle can clear it.
3dbaza
$12
Robinson R44 helicopter (186545)
...ther for a pilot and three passengers, a semi-rigid twin-blade main rotor and a twin-blade tail rotor and a slatted landing gear.
thingiverse
free
Hose Adapter for Home Protect Easy Home Dehumdifier by Azrael_UK
...ir deflector flap from the the outlet grill of the dehumidifier, the adapter will clip into the pegs that hold the air deflector.
thingiverse
free
Curtain Rod Holder by rnietzer
... under heavy tensile load. here it is, and it works fine. curtain's still alive. not a big deal, but incredibly practical. :)
thingiverse
free
Realacc X210 (Lumenier QAV-X) Actioncam mount (GoPro Session) V1 by gerdfranz
...le bit nicer with support.
not sure if this will fit the lumenier qav-x? just tested in on the realacc x210 from banggood.
enjoy.
thingiverse
free
Cable Management Clip by mo418
...so modified screwdriver clearances and added c-bores for the screws.
that's about it. nothing special, quite easy to print :)
thingiverse
free
Curtain Rod Holder by rnietzer
...d jump out under heavy pulling load. no big deal but immensely practical, and after several months of use curtain is still alive.
thingiverse
free
Dual Material Remix of Guitar Neck Rest
...t enough on its own.
i used 10% infill on both materials. sorry, you will need to rotate after merging the files in your slicer.
thingiverse
free
GoPro 4 Lens Protector by hyarion
...he camera) but you might need to scale it up/down slightly depending on your printer.
parametric cad model can be downloaded here
thingiverse
free
Rip Cord by Imirnman
...g one with smooth-on's smooth-cast 65d. it works perfectly so my suggestion would be to mold and cast this after printing it.
thingiverse
free
Kenner Millennium Falcon Gunner's Window by doogan78
...plastic can be used between frame parts 1 and 2. part 3 is a 2 layer print (at .2 mm) to create a template for the clear plastic.
thingiverse
free
Snorkel breather bracket by DefenderGuy
...ly bend and warp. replacement is as simple as printing a new part and boring out the holes to suit your specific tubing diameter.
thingiverse
free
Frame for bent-wire magnetic hook or eye by switchborg
...nts.
the provided stl is for a magnet with diameter 18 mm and thickness 3 mm.
also on github: https://github.com/kpreid/3dp-hooks
thingiverse
free
Liquid 3D Printer by alexgr
...ensor/bltouch;
power failure resume option for recovering prints.
the printer is created by alexandru grigoras and serban chisca.
thingiverse
free
Moto Z Mod Case (battery) by cyamate
...! still i don't go over 15 mm/s for tpu. scale both pieces of the model to 101% in the x and y direction for proper fitment.
thingiverse
free
FlyFox Digital 215 DJI Air Unit Mount
...ent.
i have folded back and hot-glued the wires over the top of the air unit under the bracket to avoid tension at the connector.
thingiverse
free
1/2 in Spear Tip by AeonicEntity
...e platter, but i've tested it being hit broad side and i don't think pla is the material you want to use. try abs or tpu.
thingiverse
free
Banggood Realacc x210 VTX/RX antenna mount by gerdfranz
...ort and may hit the props. so try to print with semi rigid filament. brittle filament like pla may not be a good idea as well ;-)
thingiverse
free
Bracket for multiple uses by borzz629
...pse slightly more than a semi circle so that the pole can 'pop' into position thus not coming out at the slightest knock.
thingiverse
free
Vibration Dampening Speaker Feet
...sgn.
i would suggest leaving the height at 10mm, as decreasing this could hurt the vibration
dampening properties of this design.
thingiverse
free
2x Whoop BetaFPV case insert
...n it use the stick batteries, i may remove the wider slots or make them fit smaller ones a bit better.
let me know your thoughts.
thingiverse
free
BMG/ V6 w/Endoscope Mount REMIX by KDICK
...ed is of my ender3pro with a bmg clone, v6 heatsink, and a volcano hot end.
endoscope video sample. https://youtu.be/wsffzctob_e
thingiverse
free
Two Brothers Bow Arrow Rest
...t might be too rigid. if you print in pla please let me know how it works!
this is small, so choking hazards apply here. be safe!
thingiverse
free
Kids Batman Mask by TabLeft
...retty flexible but still hold their shape. the fusion 360 link is here for anyone that wants to modify it http://a360.co/2wpq5pu
thingiverse
free
LED light ring holder for actioncam mounts by Nanocube
...e the other, screw is just to keep the end in place. oh, and it's printed from a semi-rigid pla so it can flex as needed too.
thingiverse
free
Flanged Connector - V2 by WilliamAAdams
...pe?
update: 07092011
added a couple more pictures where the hubs are used as semi-rigid joints with vinyl tubing and wood dowels.
thingiverse
free
FTC 2016-2017 Velocity Vortex Mini Model(Updated-Printable beacons) by LectricLegends8417
...ell.... comment with your suggestion, comments, or anything!
-eric, co-captain, lead programmer, and one of four cad specialists.
thingiverse
free
XL-RCM 8.0 XYPHER: Mini foldable FPV quad H frame for V929/HK Q-Bot by 3dxl
...*i've already include diagram of electronic hardware installation. please check for those who are new into fpv installation.
thingiverse
free
MRM Scythe, Switchblade & BlackBolt XBR hoods by NorCAL3D
... you will have a trouble free setup.
the foxeer legend1 and session mount hoods have not been updated to the captured nut system*
thingiverse
free
CR-10 Semi automatic Z-probe by cigp
...stops cables. its easy to keep stock by crafting the a simple 2 wire cable with and a female connector (2.54 3p xh) on each side.
thingiverse
free
Ender 3 V2 raised feet, padded for noise & resonance reduction by gilly99
... to work by reducing all the resonance i was previously getting - could probably benefit further from anti-vibration rubber pads.
thingiverse
free
Cosplay - Flat hinge remix
...degree of movement available (circa 60 deg on the inside - thus giving a total hinge angle of 270 degrees from end to end approx)
thingiverse
free
ZYYX Exhaust Duct by ZYYXman
...e zyyx. the original four screws holding the fan in place were removed and replaced with longer screws to accommodate the flange.
thingiverse
free
Endoscope Mount for BIBO 2 Touch Dual Extruder X Laser by lawrenceinflorida
...grommet and keep the wire. just bend the wire 90 degrees and you can use it as is without having to remove the rigid steel wire.
thingiverse
free
IKEA FNITTRIG 24cm Semi-hydro Insert by andr3wyong
...a to have different manufacturing tolerances and i needed a 64mm depth version, as the 69mm depth version had too large of a gap.
thingiverse
free
Finglonger-on-a-stick by mostly_harmless
... if i'd invented the fing-longer (on-a-stick). [sigh]. a man can dream though. a man can dream..."
―hubert j. farnsworth
thingiverse
free
Remixed X210 body with camera guard and 45 deg SMA mount by Rollerah
...g these body parts does not require any changes to the original x210 frame. the total weight of all tpu parts is around 15 grams.
thingiverse
free
3D Printed Protective Face Shield by Creality3DPrinter
...ethods
a4 sheet of transparent plastic (~0.2mm pet recommended)
hole punch
3d printer
a rigid filament
a rubber band (if desired)
thingiverse
free
Ridgid Shop Vac to 2 inch Schedule 40 PVC Pipe adapter by ElizabethGreene
...ey, and an allen wrench) (oops ) out of my cnc mill and it worked fine.
thanks
thank you mr. craig for your generous tip. <3
thingiverse
free
Covid Mask 2-Piece by DinosaurNothlit
...d up tracing everything in fusion 360, so i included a fusion file so that others may edit this design more easily going forward.
thingiverse
free
Cloud Spider antenna for DJI FPV goggles by petruzzofpv
...p://openems.de/start/index.php?show=gallery
enjoy performances of this great antenna...for free!
ad maiora!
petruzzofpv@gmail.com
thingiverse
free
Bowden extruder by CherHubert
...eight: 22 mm
one allen head screw m3 x 16 and his nut
one m5 pneumatic connector
one mk8 drive gear
assembly:
see pictures above
thingiverse
free
Dipole Antenna for R9M etc 900MHz FrSky R9 by Sm1thson
...ants to remix it https://cad.onshape.com/documents/e18ef6254b0ae8af3ad3ad60/w/2219b0fc65ec5d5b5f56955a/e/22faf53cfb3ce74e4ed653e4
thingiverse
free
Semi-Flexible Race Quad Frame (built in go pro mount)(bottom mounted battery) by po3plestorm
...s=buy
flight controller/esc used:https://www.amazon.com/gp/product/b07ywdpx9w/ref=ppx_yo_dt_b_search_asin_title?ie=utf8&psc=1
thingiverse
free
Bowden extruder v2 by CherHubert
...first version of the extrude. the illustrations above are those of the v1, but that's strictly the same for this new version.
thingiverse
free
8mm SMD Component Holder|Reel|Dispenser
...tension spring on the holder, the main spool knob is.
there are 2 different styles of spool cap. choose whichever one you prefer.
thingiverse
free
M1911 Rubber Band Gun by tjsc5f
...tch?v=1ck5_6zz_7c
don't forget to print something to shoot at - this thing is great:https://www.thingiverse.com/thing:1306585
thingiverse
free
pylon racer by Sulhan
... setup:
brushless 2204 ccw 2300kv
tgs propeller 4.75 x 4.75
esc 20a
lipo 850mah 3s
servo 9gr
offcourse you can use your own setup
thingiverse
free
anet a6 open-fronted fan duct - with support clip! by zanderlex
... ducts require the adjustable extension piece to be printed and inserted in the top to allow them to fit into the a6 fan housing.
thingiverse
free
Form for quadrifilar helix antenna by KerwoodDerby
...quot; semi-rigid or hand-formable coax with solid ptfe dielectric is being used, but you can tweak coaxdia variable as necessary.
thingiverse
free
iFlight iX3 140mm 3in Build by tfortmuller
...ch greater thrust. this set up now clocks in at 213.9g, well under the 250g faa limit and achieving great performance in flight.
thingiverse
free
Semi Ducted Micro Frame (Beecheese Frame) by Noctaro
...v=lvvpgyhq9pw
print settings
printer brand:
printrbot
printer:
printrbot plus
rafts:
no
supports:
no
resolution:
0.2
infill:
100%
thingiverse
free
Canister-type Hepa Filter Adapter (Universal) by wubwub89
... in case of a failure. if you're not sure about these things, maybe you shouldn't be doing whatever you are doing.
enjoy.
thingiverse
free
RailCore II by kraegar
...oups/railcore/
for a community based site with a wiki, build guides, user contributed configs, faq, and more: http://railcore.org
thingiverse
free
Adjustable height conduit leg system by Nscale_toni
...ead screws instead of bolts for proper fit.
11-04-2017 added pocket design for 1/2" conduit legs - "half inch.stl"
thingiverse
free
Ender VX-500 by koen_vdl
...ion video: https://youtu.be/xiqcepzt0x8
a detailed protocol on the use of the ender vx-500 machines: https://tinyurl.com/yyhyqsy6
thingiverse
free
Ender 3 Ultralight Modular Mount for Orbiter Direct Drive with E3D v6, NF Crazy, and Mosquito Hotends by mbrady6
...lso be on the lookout for an ender 3 mount for the mosquito hotend and a dual extruder mount for the mosquito and v6 coming soon.
renderosity
$14
dForce Fancy Punk Genesis 8 Females
...nique 8<br />
mei lin 8<br />
gia 8<br />
fbm fitness<br />
my own fbm for g8f (chameleon rose)</p>
thingiverse
free
Semi Ducted Micro Frame (Beecheese Frame V3)(cam mount integrated) by Noctaro
...e motors ->https://goo.gl/72d5is
1x jst sh 1.0 - 4 pin - pigtails or connectors for the fpv camera -> https://goo.gl/r3vn92
thingiverse
free
Clap Extruder by CherHubert
...on with respect to the toothed wheel
as an option, the nema17 motor strapping allows to fix a motor with two 3mm diameter screws.
thingiverse
free
Modular Yoke/Spreader Bar
...n't even finished designing or printing a complete model for that one yet. it also uses actual locks instead of clevis pins.
thingiverse
free
Brushless beecheese frame (Semi ducted micro brushless frame) by Noctaro
...12x m3 screw
i recommend metal screws for the first time using the screw holes. afterwards you may use abs or anything like that.
thingiverse
free
Kossel Wire Cable Frame Braces 2020 (Unlock WARP SPEED) by Kiolia
...s of tension.
10.24.18: spreader arms posted to help fix most of the volume loss issue: https://www.thingiverse.com/thing:3173546
thingiverse
free
MonoPrice Select Mini Bed Expansion (150mmx230mm) by YourDrunkle
...ame way and the layout in the frame should be obvious. the ribs in the belt will sit in the ribs on the inside edge of the frame.
thingiverse
free
BOR 90 Inspired Trimaran by Tunabarrage
...foil port
1x foil starboard
1x rudder
4x m3x30mm screws
4x m3x20mm screws
1x m3x25mm screw
6x m3 locknut
1x m3 washer
1x m3 nut
thingiverse
free
Customizable Helix (Helical) Antenna Frame and Winding Template by stylesuxx
... the wave trap and made the helix antenna popular for fpv.
references
rcgroups' ibcracy helical antenna and wavetrap tutorial
thingiverse
free
Monster Kossel v2 by goeland86
...here it meets the 2060. it works plenty well if you put 3 of them in place on a 1m length, one in the middle and one at each end.
thingiverse
free
Scalar Family - 3D Printer by 3DModularSystems
...ww.3dmodularsystems.com
twitter: https://twitter.com/3dmodularsystem
youtube: http://www.youtube.com/c/3dmodularsystems3dprinters
grabcad
free
Semi Rigid Suspension System
...semi rigid suspension system
grabcad
here is my first project uploaded on grabcad i hope u like it.
grabcad
free
Semi-trailers rigid axle design calculation report
...semi-trailers rigid axle design calculation report
grabcad
this report was done to help designers how to create there own axles
grabcad
free
65 GHz Mini-SMP (MSMP) Semi-Rigid Coaxial Straight Connector Plug
...50 ohm 0.047" semi-rigid coax such as ut47
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz Mini-SMP (MSMP) Semi-Rigid Coaxial Straight Connector Plug
... semi-rigid coax such as ut85-m17 and rg-405/u.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz Mini-SMP (MSMP) Semi-Rigid Coaxial Right-Angle Connector Plug
... ohm 0.047" semi-rigid coax such as ut 47.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz Mini-SMP (MSMP) Semi-Rigid Coaxial Right-Angle Connector Plug
...emi-rigid coax such as ut 85-m17 and rg 405 /u.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz 1-Port PCB SMT-Mount Mini-SMP (MSMP) Semi-Rigid Coaxial Connector Socket
...-port pcb smt-mount rosenberger (p/n : 18s102-40ml5) 65 ghz mini-smp (msmp) semi-rigid coaxial connector socket with full detent.
grabcad
free
65 GHz 2-Port Edge-Mount Mini-SMP (MSMP) Semi-Rigid Coaxial Connector Socket
...igid coaxial connector socket with full detent.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz 1-Port Edge-Mount Mini-SMP (MSMP) Semi-Rigid Coaxial Connector Socket
...igid coaxial connector socket with full detent.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz 4-Port Edge-Mount Mini-SMP (MSMP) Semi-Rigid Coaxial Connector Socket
...igid coaxial connector socket with full detent.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz 1-Port Panel-Mount Mini-SMP (MSMP) Semi-Rigid Coaxial Connector Socket
...igid coaxial connector socket with full detent.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz 1-Port PCB TH-Mount Mini-SMP (MSMP) Semi-Rigid Coaxial Connector Socket
...igid coaxial connector socket with full detent.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
65 GHz 1-Port PCB SMT-Mount Mini-SMP (MSMP) Semi-Rigid Coaxial Connector Socket
...igid coaxial connector socket with full detent.
note: another great alternative cross replacement is from amphenol sv microwave.
grabcad
free
Linear wire feeding module
...r cable.
the module includes a feeding system with four active rollers and an encoder unit for reading the cable feeding length.
cg_trader
$29
CargoLifter Airship
...fter airship
cg trader
the cargolifter cl160 german semi-rigid airship. 850-feet long and capable of carrying loads of 160-tons.
grabcad
free
Umbra Essence
...id rubber part with umbra embossed letters witch as free motion, giving the user a surface to apply force and dispense the paper.
cg_trader
$5
HYSTEROSCOPE
...hafts with handle or without handle
semi-rigid manual instruments; forceps, punches, scissors
hf-electrodes: button, loop, needle
cg_trader
$30
Parametric Rigid Chain Bracelet | 3D
...ion. parametric series
internal diameter 70mm. stl format, ask for availability in inner diameter and / or different file format.
cg_trader
$3
3DTAC TBX Training Blade | 3D
...melee combat. it consists of a semi rigid blade printed in two halves and a 3d printed ergonomic handle fixed by a screw or glue.
grabcad
free
Sony RX0ii Accessories
...apters are meant for 58mm filter thread nd filters so that they don't cause vignetting on the beastgrip 0.6x wide angle lens.
cg_trader
$10
Helicopter Robinson R44
...seating for a pilot and three passengers, a semi-rigid two-bladed main rotor and a two-bladed tail rotor and a skid landing gear.
cg_trader
$128
Rigid Dump Truck
...ryrender or maxwell.
7 animatable elements.
fully uv mapped.
8 materials.
texture map 2000 x 3000 px.
bump map 2000 x 3000 px.
grabcad
free
Bell 407
...eloped for the united states army's oh-58d kiowa warrior instead of the two-blade, semi-rigid, teetering rotor of the 206l-4.
grabcad
free
Renault Magnum-680 hp-2015
...figurations, both configurations could be bought with a 6×2 or 4×2 drivetrain. the 6×4 is merely designed for heavy haulage uses.
grabcad
free
Rosenberger TNC Coax RF Sealed Bulkhead Connector
...communications infrastructure cable connector. more information about 2.2-5 (iec 61169-66 ed1) is here : https://2.2-5series.com/
cg_trader
$80
Twin Engine Inflatable Boat
... semi rigid motor vehicle sea beach ocean motorboat inflat water craft watercraft recreational recreational watercraft motor boat
grabcad
free
Rosenberger TNC Coax 11 GHz RF Sealed Bulkhead Connector
...communications infrastructure cable connector. more information about 2.2-5 (iec 61169-66 ed1) is here : https://2.2-5series.com/
cg_trader
$35
Bell 407 Jetranger
...ntly used for corporate and offshore transport, as an air ambulance, law enforcement, electronic news gathering and movie making.
cults
$5
3DTAC / TBX (Training Blade MK.X) Prop
...tton cap screw
four 3/16" x 3/8" button cap screw
3/16" thread cutter (to thread the screw holes)
print settings:
cg_trader
$159
Komatsu HD605-8 Rigid Dump Truck
...ghway dumptruck auto car cargo vehicle semi lorry van dump industrial machine heavy dumper mining large hauler industrial vehicle
grabcad
free
ARMS - Advanced Restraint and Mobility System
...evers to secure themselves in place. at any time, the astronaut can use the quick-release system to free their belt from the arm.
grabcad
free
Liquid 3D Printer
...project is open-source, licensed under cc by-nc 4.0. more details can be found at http://creativecommons.org/licenses/by-nc/4.0/.
grabcad
free
TPA HNB Series Electric Belt Driven Linear Actuators
...ious automation environments.
repeated positioning accuracy: ±0.04mm
max payload: 140kg
stroke: 100 - 3050mm
max speed: 7000mm/s
grabcad
free
L-KLS1-SMA006
...plating
center contact female: beryllium copper,gold plating
insulator: ptfe
gasket:silicone rubber
crimp ferrule:annealed copper