Thumb Nut and Stud for Bottom Cover Singer Models 221, 301A, 401A
4.5 (1,234)
Sold 100+ last 30 days
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$10.99
Color
Black
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Replacement Thumb Nut or Stud for bottom cover. Fits Singer models: 221, 301A, 401A, 404, 403A, 500A, and 503A
Thumb Nut Part # 51621
Stud Part # 51361
Reviews
4.7
3 ratings
5
4
3
2
1
The thumb nut was a perfect fit for the finishing touches that completed my latest machine, a 1957 Singer 401a.
B
Brian · May 28, 2026
This lug screw is slightly short but made it work.