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Crankshaft Thread Size Chart

The following chart has been provided with the assistance by the fine people at Du-Bro. Du-Bro has been providing the model industry with literally hundreds of products for over 40 years and have been one of the mainstays of the industry.

This chart should be helpful when selecting spinners, spinner adapter nuts and hub nuts for your aircraft.

 Manufacturer Engine Designation Thread Size
 ASP .21 ABC - .46 ABC 1/4" - 28
 ASP .61 all models, .75 ABC, .91 ABC,
.65 4-C, .80 4-C
5/16" - 24
 Enya SS.25, SS.25BB, SS.30, SS.30BB, .35X, SS.40, SS40BB, SS.45 Ring, .46 4-C, .41 4-C 1/4" - 28
 Enya .15, SS.15, .19, .19X, .21CX, .25X 6.0 x 1mm
 Enya .35, .40, .40X, .40CX, .49X, .45, .45CX, GP.45CX, .50CX, .60FXIII, GP-60XF-4, GP.60XF-4H, .60XLF, GP.60XLF-4, .60 4-C, .80 4-C, .90 4-C, 120 4-C 7.0 x 1mm
 Enya R120 4-C, R120GP 4-C 8.0 x 1mm
 Fox .19RC, .19CL, .25RC, .25CL, .35CL, .40RC, .40CL, .50RCBB, .45RC Schnuerle, .40 Quickie 1/4" - 28
 Fox .60 - .74 Eagle 5/16" - 24
 Fitzpatrick .61 ABC 1/4" - 28
 HB .20 - .61 all models 1/4" - 28
 HP .21 - .61 all models 1/4" - 28
 HP VT.21 4-C, VT.49 4-C,
.40FRT Gold Cup, .61FRT Gold Cup
6.0 x 1mm
 HP 1.20 5/16" - 24
 Irvine .20 - .61 all models 1/4" - 28
 K&B .20 - .65 all models 1/4" - 28
 Magnum GP.25, GP.40, Pro.25, Pro.36SE, Pro.40SE, Pro.46SE 1/4" - 28
 Magnum GP65SE, Pro.61SE 5/16" - 24
 MDS .46 1/4" - 28
 MDS .25 - .40 6.0 x 1mm
 MDS .61 5/16" - 24
 Merco .33 - .40 1/4" - 28
 Merco .50, .61 5/16" - 24
 Moki .61 Long Stroke all models 1/4" - 28
 Moki .51RC 6.0 x 1mm
 Morris .45 - .60 8.0 x 1.25mm
 MVVS .15 - .61 6.0 x 1mm
 OS .20 - .50 all models, .61SFN-H Ring,
.61RFN-H ABC, FS-26 Surpass, FS-40 Surpass
1/4" - 28
 OS .60FP ABC, .61SF all version, .61RF ABC, .61RF-P, .61RX-H, .61SX-H, .61VR-M ABC, .65VR-M ABC, .65VR-DF ABC, .91VR-DF, .81VR-M, .91FSR, FF-240, FS-70 Surpass,
FS-91 Surpass, FS-120 Surpass II,
FS-120 Surpass SP, FS-61, FS-90, FS-120,
FT-120II, FT-160
5/16" - 24
 Picco .21 - .45 all models 1/4" - 28
 Quadra Q-35 5/16" - 24
 Rossi .21 6.0 x 1mm
 Rossi .40 - .90 8.0 x 1.25mm
 Royal .25RC BB ABC, 28RC BB ABC, .40RC ABC Schnuerle, .45RC BB Schnuerle ABC,
.46RC BB Schnuerle ABC
1/4" - 28
 Saito .40 - .60 4-C 6.0 x 1mm
 Saito .65 - .90 4-C 7.0 x 1mm
 Saito 1.20 - 2.70 4-C 8.0 x 1.25mm
 Supertigre .19 - .56 all models, .60G, 60ST 1/4" - 28
 Supertigre S-90K, S-61K, X61K ABC RE 5/16" - 24
 Thunder Tiger GP25, GP42, PRO25, PRO46, F-54S 1/4" - 28
 Thunder Tiger GP61, PRO61, PRO120, F-91S 5/16" - 24
 Webra .21 - .60 all models 1/4" - 28
 Webra .80 - .90 all models 8.0 x 1.25mm
 YS all 2-cycle models 8.0 x 1.25mm
 YS all 4-cycle models except .53 8.0 x 1.0mm
 YS .53 4-C 6.0 x 1.0mm