See part C-39 in the diagram

Nut-Rotor 690689001

Works with your model 51992!

$6.16

Works with your model 51992!

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Troubleshooting

This part works with the following brands:

This part works with the following products:

This part works with the following models:

ERP Number: ERP9997414
Manufacturer Part Number: 690689001

Brand	Model Number	Description
Toro	51944	Trimmer - 25cc Power Head
Toro	51945	Trimmer - 25cc Power Head
Toro	51946	Trimmer - 25cc Power Head
Toro	51947	Trimmer - 25cc Power Head
Toro	51948	Trimmer - 51948 25.4 Cc Gas Power Head S/N 314000001 & Up Mfg. No. 090309018
Toro	51954	Trimmer - 17in Curved-Shaft Gas Trimmer
Toro	51955	Trimmer - 17in Curved-Shaft Gas Trimmer
Toro	51956	Trimmer - 17in Curved-Shaft Gas Trimmer
Toro	51957	Trimmer - 17in Curved-Shaft Gas Trimmer
Toro	51958	Trimmer - 17in Curved-Shaft Gas Trimmer
Toro	51958VNM	Trimmer - 51958vnm 17 In. Gas Trimmer - Curved Shaft S/N 320000001 & Up Mfg. No. 090309052
Toro	51972	Trimmer - Straight Shaft String Trimmer
Toro	51974	Trimmer - 18in Straight-Shaft Gas Trimmer
Toro	51975	Trimmer - 18in Straight-Shaft Gas Trimmer
Toro	51976	Trimmer - 18in Straight-Shaft Gas Trimmer
Toro	51977	Trimmer - 18in Straight-Shaft Gas Trimmer
Toro	51978	Trimmer - 51978 18 In. Gas Trimmer - Straight Shaft S/N 320000001 & Up Mfg. No. 090309048 11-22-21 (Rev:02)
Toro	51978A	Trimmer - 51978a 18 In. Gas Trimmer - Straight Shaft S/N 317000001 & Up Mfg. No. 090309029 8-16-17 (Rev:01)
Toro	51978VNM	Trimmer - 51978vnm 18 In. Gas Trimmer - Straight Shaft S/N 319000001 & Up Mfg. No. 095309106 7-16-21 (Rev:03)
Toro	51988	Leaf Blower / Vacuum - Powervac Gas-Powered Blower
Toro	51992	Brush Cutter - Brushcutter
Toro	51993	Trimmer - 51993 Brushcutter S/N 260000001 & Up
Toro	51998	Trimmer - 18in Straight-Shaft Gas Trimmer