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PRECISION MACHINED NUTS
Features and Benefits
• MachinedNutsareheld100%squaretothetap.Theyaresuperiortocoldformedandpunchednutswhicharewoundontotapsandnotheld.
• Cutthreadsrollfreelywithno“tight”spots.
• AllSPIROLthreadsaremanufacturedtostrictstandardswithspecificgages.
• Weprovidestrictlotcontrolandtraceability.
• Threadpitchdiameterallowancesareengineeredforeaseofassemblyafterplating.
• Unlikethoseofsomemanufacturers,ourproductsareclean,dry,burrfree,andreadytouse.
PRECISION MACHINED NUTS
STANDARD SPECIFICATIONS
MATERIAL
E Free-CuttingBrass
ASTMB16UNS36000
EN12164CW603NCuZn36Pb3
RoHSCompliant
K Plain
N BrightNickelPlate
FINISHES
Note:See page 8 for alternate materials and finishes.
SPIROLspecializesinthemanufactureofPrecisionMachinedNuts.Innovativeengineering,purpose-modifiedautomaticscrewmachines,andCNCmachinesyieldproductionratesthatpermitustoofferqualitypartsatpricingcomparabletolessprecisemanufacturingmethods.
SPIROLiscommittedtocontinuousimprovementinallfunctionalandoperationalareaswiththeobjectiveofconsistentlyexceedingourcustomers’expectations.
SPIROL offersengineeringresourcesaswellasstockinglocationsthroughouttheworldtobetterserveyourcriticaldeliveryneeds.
ThreadsareperpendiculartothefaceofaPrecision Machined Hex Nut.Thiseliminatescamberissues.
ThebearingsurfacesofaStamped Nutaretappedasasecondaryoperationbywindingitontoarotatingtap.Therefore,thethreadcannotbeguaranteedtobeperpendiculartothebearingsurface.Thiscreatesdeflectionissues.
HexNutsarethemostversatileandwidelyusednutdesign.FinishedHexNutsaregenerallyusedwithboltstolockJamNutsagainstfinishedsurfaces(see Jam Nuts on next page).
HeavyHexNutsarethickeracrosstheflatsthancomparableFinishedHexNuts.TheyarethestrongestHexNutsbecauseoftheirgreaterlengthofthreadengagement,andtheyareresistanttostretchingandwidening.OurstandardFinishedandHeavyHexNutsaredoublechamferedbutcanbemadewithasinglechamferandawasherface.
Forapplicationswherevibration,lateralmotion,orwedgetypeloadswilltendtoloosentheHexNut,itiscommontouseaJamNuttomaintainjointintegrity.TheHexNutisusedtoprovidethetensiontotheboltandtheJam
NutisusedtoprovideasecondaryloadtotheHexNutthatisnotsubjecttothesameoperationalconditionsastheboltandHexNut.
SERIES H10 FINISHED HEX NUTS SERIES H11 HEAVY HEX NUTS
SPIROL DESCRIPTION: NT/ThreadSize/WrenchSizexThicknessMaterialFinishSeries#EXAMPLE: NT/.375-16/.562x.328EKH10
1Note:SPIROL converts wrench size and thickness to decimals for description.
7/16
1/2
9/16
11/16
3/4
7/8
15/16
1-1/8
1-5/16
1-1/2
1-11/16
1-7/8
Wrench Size
.250–20
.312–18
.375–16
.437–14
.500–13
.562–12
.625–11
.750–10
.875–9
1.000–8
1.125–7
1.250–7
7/32
17/64
21/64
3/8
7/16
31/64
35/64
41/64
3/4
55/64
31/32
1-1/16
HEX NUTS, H10 AND H11
H2
Thickness
Thread Size
15/64
19/64
23/64
27/64
31/64
35/64
39/64
47/64
55/64
63/64
1-7/64
1-7/32
H1
Thickness
1/2
9/16
11/16
3/4
7/8
15/16
1-1/16
1-1/4
1-7/16
1-5/8
1-13/16
2
FWrench Size
FH10 Finished Hex H11 Heavy Hex
1/4–20
5/16–18
3/8–16
7/16–14
1/2–13
9/16–12
5/8–11
3/4–10
7/8–9
1–8
1-1/8–7
1-1/4–7
Series H10 Series H11F H2H1
Heavy Hex Nut
Heavy Hex Jam Nut
SERIES H20 HEX JAM NUTSSERIES H21 HEAVY HEX JAM NUTS
AJamNutistypically2/3thethicknessofitsrespectiveHexNutseriescounterpart.
AHeavyHexorFinishedHexNutistightenedagainsttheworksurfaceandaJamNutissecuredagainsttheHexNuttoensurethatthenutdoesnotbecomeloose.
SeriesH20HexJamNutsareusedwithSeriesH10FinishedHexNuts.
SeriesH21HeavyHexJamNutsareusedwithSeriesH11HeavyHexNuts.
2
F H2H1
Series H20 Series H21
SPIROL DESCRIPTION: NT/ThreadSize/WrenchSizexThicknessMaterialFinishSeries#EXAMPLE: NT/.562-12/.937x.328ENH21
Note:SPIROL converts wrench size and thickness to decimals for description.
7/16
1/2
9/16
11/16
3/4
7/8
15/16
1-1/8
1-5/16
1-1/2
1-11/16
1-7/8
Wrench Size
.250–20
.312–18
.375–16
.437–14
.500–13
.562–12
.625–11
.750–10
.875–9
1.000–8
1.125–7
1.250–7
5/32
3/16
7/32
1/4
5/16
5/16
3/8
27/64
31/64
35/64
39/64
23/32
HEX JAM NUTS, H20 AND H21
H2
ThicknessThread Size
11/64
13/64
15/64
17/64
19/64
21/64
23/64
27/64
31/64
35/64
39/64
23/32
H1
Thickness
1/2
9/16
11/16
3/4
7/8
15/16
1-1/16
1-1/4
1-7/16
1-5/8
1-13/16
2
FWrench Size
FH20 Hex Jam H21 Heavy Hex Jam
1/4–20
5/16–18
3/8–16
7/16–14
1/2–13
9/16–12
5/8–11
3/4–10
7/8–9
1–8
1-1/8–7
1-1/4–7
SERIES H30HEX MACHINE SCREW NUTS
Thesegeneral-purposeHexNutsaredesignedtobeusedspecificallywithmachinescrewsinlighttomoderateloadsorwithboltsforheavyloads.
3
SPIROL DESCRIPTION: NT/ThreadSize/WrenchSizexThicknessMaterialFinishSeries#EXAMPLE: NT/.164-32/.344x.125ENH30
Note:SPIROL converts wrench size and thickness to decimals for description.
3/16
3/16
1/4
5/16
5/16
11/32
3/8
3/8
7/16
7/16
9/16
5/8
F
Wrench Size
2–56
3–48
4–40
5–40
6–32
8–32
10–24
10–32
12–24
1/4–20
5/16–18
3/8–16
Thread Size
1/16
1/16
3/32
7/64
7/64
1/8
1/8
1/8
5/32
3/16
7/32
1/4
HEX MACHINE SCREW NUTS, H30H
Thickness
.086–56
.099–48
.112–40
.125–40
.138–32
.164–32
.190–24
.190–32
.216–24
.250–20
.312–18
.375–16
F HSeries H30
SERIES H31 SMALL PATTERNHEX MACHINE SCREW NUTS
SmallPatternHexMachineScrewNutsaredesignedtobeusedforlightloads.Inapplicationswherethereislimitedroomforwrenching,thesmallerhexsizeisanadvantage.
VirtuallyanythreadcanbemadeintoaSmallPatternMachineScrewNut.Aslongasthereisenoughclearancebetweenthewrenchsizedistanceandthethread,nominalthreadsizesareavailableinanynutpattern.Thisallowsanumberofuniquecombinationsthatcanbemadetoorderinadditiontoourstandardoffering.
F HSeries H31
4
3/16
1/4
1/4
1/4
5/16
5/16
F
Wrench Size
4–40
5–40
6–32
8–32
10–24
10–32
Thread Size
1/16
3/32
3/32
3/32
7/64
7/64
SMALL PATTERN HEX MACHINE SCREW NUTS, H31H
Thickness
SPIROL DESCRIPTION: NT/ThreadSize/WrenchSizexThicknessMaterialFinishSeries#EXAMPLE: NT/.138-32/.250x.094EKH31
Note:SPIROL converts wrench size and thickness to decimals for description.
.112–40
.125–40
.138–32
.164–32
.190–24
.190–32
PanelNutsareoftenusedwhereveralightdutyprecisionfastenerisneeded.TypicallyPanelNutsaredesignedtobethinandhavewidthdimensions(F)closetothediameterofthefastenertheysecure.Thiscreatesalowprofileusedinlightdutyapplicationsbecausetheyhavelowthreadcounts.
ApplicationsforPanelNutsincludeswitchhardware,potentiometercontrols,cableglandfastenersandlightweightlocknuts.
Series H40 — Hexagon Panel Nuts• Exteriorchamferedonallsurfaces• Nothicknessvariations• Nocutoffburrs
Series R10 — Knurled Round Panel Nuts• Exteriorchamferedonallsurfaces• Cleanfullformedknurlsfreeofsliversandflakes
SERIES H40 HEX PANEL NUTSSERIES R10 ROUND PANEL NUTS
5
STRAIGHT KNURL
F H FH
Series H40 Series R10
SPIROL DESCRIPTION: NT/ThreadSize/WrenchSizeorDiameterxThicknessMaterialFinishSeries#EXAMPLE: NT/.250-40/.312x.062EKH40
Note:SPIROL converts wrench size, diameter and thickness to decimals for description.
PANEL NUTS, H40 AND R10
1/29/325/163/85/167/161/29/169/165/83/4
9/16———3/8—1/29/165/8—3/4
.125–27
.190–48
.250–32
.250–32
.250–40
.312–32
.375–32
.469–32
.469–32
.500–28
.625–27
3/32———3/32—3/325/643/32—1/8
1/83/641/161/161/167/643/325/643/321/83/32
HFThread SizeThickness
H40 Hex R10 Round
Wrench Size DiameterThicknessHF
1/8–2710–481/4–321/4–321/4–405/16–323/8–3215/32–3215/32–321/2–285/8–27
SERIES C10 CLOSED CAP NUTSSERIES C20 OPEN CAP NUTS
Cap Nuts (Acorn Nuts) are available in two basic configurations, open and closed. SPIROL® Cap Nuts are precision machined to withstand substantially higher tightening torque without stripping or having a bolt break through the dome, as can happen with two piece equivalent
cap nuts. Generous counterbores allow for better assembly when an unthreaded portion of the mating component protrudes above the surface.
Series C10 — Closed Cap NutsClosed Cap Nuts decoratively finish the exposed ends of bolts. They also offer
protection from the sharp edges of bolts. Completely machined dome surfaces ensure safe handling and smooth and bright finishing.
Series C20 — Open Cap NutsOpen Cap Nuts are used for assembly of bolts whose lengths are imprecise and intended to go all the way through the fastener. Clean machining provides a superior surface for plating and offers a quality appearance.
FH2H1
Series C20Series C10
6
SPIROL DESCRIPTION: NT / Thread Size / Wrench Size x Height Material Finish Series #EXAMPLE: NT / .750 - 10 / 1.062 x .875 EN C10
Note: SPIROL converts wrench size and height to decimals for description.
CAP NUTS, C10 AND C20
1/41/45/165/163/83/83/87/161/27/161/29/161/29/16
FWrench
Size.112 – 36.112 – 40.138 – 32.164 – 32.190 – 24.190 – 32.216 – 24.250 – 20.250 – 20.250 – 28.312 – 18.312 – 18.312 – 24.312 – 24
Thread Size
1/41/49/329/3211/3211/3211/323/8
13/323/8
13/327/1613/327/16
H1
C10Closed
C20Open
15/6415/641/41/49/329/329/3221/643/8
21/643/83/83/83/8
H2
5/85/83/43/43/43/47/87/811
1-1/161-1/161-7/16
FWrench
Size3/8 – 163/8 – 24
7/16 – 147/16 – 201/2 – 131/2 – 20
9/16 – 129/16 – 18
5/8 – 115/8 – 183/4 – 103/4 – 16
1 – 8
Thread Size
1/21/29/169/169/169/163/43/43/43/47/87/8
1-1/4
H1
C10Closed
C20Open
27/6427/641/21/21/21/25/85/83/43/43/43/41
H2
HeightHeightHeightHeight
4 – 364 – 406 – 328 – 32
10 – 2410 – 3212 – 241/4 – 201/4 – 201/4 – 28
5/16 – 185/16 – 185/16 – 245/16 – 24
.375 – 16
.375 – 24
.437 – 14
.437 – 20
.500 – 13
.500 – 20
.562 – 12
.562 – 18.625 – 11.625 – 18.750 – 10.750 – 161.000 – 8
SERIES T10KNURLED THUMB NUTS
Thumb Nuts are used in applications where a fastener needs to be adjusted and secured to a finger tight degree. Precise knurls are clearly formed and optional “face” knurls help lock the parts in place.
Popular applications for Thumb Nuts include panel mounts, home hardware, tension adjustment hardware and electrical applications.
Our machining process ensures that Series T10 Thumb Nuts are machined with no thickness variations or burrs. Heavy countersinks permit tightening over the shank portion of bolts that can extend slightly above the surface.
F H
Series T10
7
SPIROL DESCRIPTION: NT / Thread Size / Diameter x Height Material Finish Series #EXAMPLE: NT / .190 - 24 / .500 x .328 EK T10
Note: SPIROL converts diameter and height to decimals for description.
Optional “Face” Knurls
RADIUS STEM, SINGLE KNURL THUMB NUTS, T10
1/4
3/8
3/8
7/16
1/2
1/2
5/8
11/16
F
2 – 56
4 – 40
6 – 32
8 – 32
10 – 24
10 – 32
1/4 – 20
5/16 – 18
1/4
1/4
1/4
5/16
21/64
21/64
3/8
13/32
HThread Size
Diameter Height
.086 – 56
.112 – 40
.138 – 32
.164 – 32
.190 – 24
.190 – 32
.250 – 20
.312 – 18
SPECIALS
SPIROL’sEngineerscanassistinidentifyingthebeststandardPrecisionMachinedNuttomeetthespecificapplicationperformancerequirements.SPIROLcanalsoproducespecialvariationsofourstandardlinesofMachinedNutsincludinghexagoncouplingnuts,tamperproofnuts,boltnuts,railroadnuts,lampandlightingparts,pipecouplings,compressionnuts,andmore.IfauniquespecialMachinedNutisrequired,SPIROLwilldesignandproducethespecialforeitherloworhighvolumeapplications.
Examplesofspecialofferingsinclude:
Special SizesSPIROL’sstandardlineofPrecisionMachinedNutscanbeeasilyalteredtoincludemetricsizes,speciallydesignednon-standardthreads,andnon-standardthreadpitchconfigurations.Shouldyourrequirementcallforround,hex,squareorotherexternalconfiguration,oversizedthreadsforplating,finelycontrolledinternaldiametersorevenspecialmachinedfeatures,SPIROLcanaccommodateyourrequest.
SPIROLspecializesinthemanufactureoflargediameterspecialtyMachinedNutsinlowvolumes.SPIROLcanproduceNutsupto2”acrosstheflats,upto2.3”diameterwithathicknessupto3”.
Special ThreadsPrecisionNutscanbemachinedwithanyinchormetricthreadtoANSIH.28orJISstandard,leftorright-handpipethreads,ANSIB1.1,ANSIB1.13M.
Special MaterialsInadditiontothestandardbrass,SPIROL’sproductiontechnologyenablesustoproduceMachinedNutsoutofavarietyofmaterials.Themostcommonalternatematerialsarealuminumand300seriesausteniticstainlesssteel;howeverwealsoproducelowvolumeNutsoutof12L14lowcarbonsteel.MachinedNutsmadefromalternatematerialsaremadetoorder.
Special FinishesSPIROLcanprovidevirtuallyanyfinishonMachinedNuts.Standardfinishesareplainandbrightnickelplated.Alternatefinishesincludepassivated,blackoxide,zincplate,zincplatewithchromate(inclear,yellow,oliveorblackcolor),brightacidtin,andphosphatecoated.
Special Surface ConfigurationSPIROLcanmachineproductswithmultiplediameters,grooves,knurls,
threads,chamfers,heads,centerholes,sideholes,aswellasthosethatareturned,shaved,burnished,broached,backdrilled,
andcounterbored.
8
9
APPLICATION ENGINEERINGIN PRACTICE
Application:AmanufacturerofswitchproductsrequestedthatSPIROLmanufactureacustomHexPanelNutfortheirEuropeanmarket.Thislarge,specialMachinedNuthada15mmwrenchsizeandaM13thread.ThecustomeralsorequiredaqualityproductthatwascosteffectivetokeeppricescompetitivefortheirEuropeanproductlaunch,butmetricbrassbarstock–eitherprefabricatedorcustomextruded–isveryexpensiveintheUnitedStatesduetoitslowdemand.
Solution:SPIROLEngineeringrecommendedtheuseofastandardSPIROLSeriesH40HexPanelNutbodywithaspecialM13thread.
SPIROL’sstandardPanelNuthasa.625”wrenchsize,convertingtoapproximately15.9mmacrosstheflatsversustheoriginallyrequested15mmwrenchsize.Thecustomerwasearlyenoughinthedesignstagetochangetothestandard.625”wrenchsize.Byusingthestandardwrenchsize,SPIROLwasabletomachinetheNutoutofcommerciallyavailablerawmaterial.
ThecustomercollaboratedwithSPIROLontheproductiontimingofthepartsuchthatSPIROLwasabletomanufacturetheNutwiththecustomM13threadrightaftertheproductionofthestandardPanelNutonthemulti-spindlemachine.
Ifthecustomerhadrequiredthespecialwrenchsize,theNutwouldhaverequiredacompleteset-upontheCNCmachineversusbeingabletorunonthehighvolume,productionmachine.Thisresultedinasignificantreductionintheset-uptimeasonlythetapneededtobechangedinordertocreatethespecialthreadintheinnerdiameterofthepart.ThenetresultofthecustomerpartneringwithSPIROLwasatotalcostsavingsof95%!
Panel Nuts in Toggle Switch
Machined Hex Nut in Wheel Chair
Application:AcustomercontactedSPIROLwithanaxle-alignmentproblemthattheywerehavingwithawheelchair.Theapplicationwasasolidaxlepassingthroughthecenterhubofawheel.Theaxlesarecambered,causingextrastressfornutsthatarenotsquaretothethreadedbolt.Theconventionalstampednutwascausingdeflectionintheaxlewhentightenedduetothethreadsofthenutnotbeingformedperpendiculartothefacesofthenut.Thisdeflectionwascausingpoortracking.
Solution: SPIROL’ssolutionwasaMachinedHexNutmanufacturedtothesamespecifications,butmachinedinonestepfromrawmaterialratherthanstampedandthenthreaded.SPIROL’smanufacturingmethodsallowforprecisecontrolofthecuttingtoolsresponsibleforthefinalgeometryoftheproduct.Inthiscase,threads
runningperpendiculartothefacesofthenutwereamajorperformancerequirement.Totheastonishmentofthecustomer,SPIROLprovidedaPrecisionMachinedHexNutforapricecomparabletothepricetheywerepayingforalower-performanceproduct.
With Conventional Stamped Nut
With Precision Machined Hex Nut
©2012SpirolInternationalCorporation10/12
SPIROL ApplicationEngineerswillreviewyourapplicationneedsandworkwithyourdesignteamtorecommendthebestsolution.OnewaytostarttheprocessistovisitourOptimal Application Engineeringportalatwww.SPIROL.com.
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