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Harley-Davidson Thread Sizes

    Harley-Davidson has used many different and unusual thread sizes over the years. The following Tables list some of the most common. Please E-mail me if you are aware of any others.

Chassis

Thread

1-9/64"-24

1"-24

7/8"-24

Use

Fork stem

Fork stem

Fork stem

Year

1930-36 BT

1936-* BT

1929-57 45

Thread

3/8"-20

7/32"-32

5/16"-32

Use

Star hub wheel lug

Gas tank top screw

Zerk fitting

Year

1936-72

1918-35 all, 1937-73 45

1924-*

Thread

7/16"-28

13/16"-24

7/8"-24

Use

Clutch lever

Handlebar end screw

Handlebar end screw

Year

1941-73 45

1931-35 BT, 1931-39 45

1936-48 BT, 1940-57 45

Motor

Thread

7/16"-20

7/16"-20

7/16"-16

Use

Head bolt

Base stud, nut

Head bolt

Year

1948-83 OHV BT

1930-83 BT

1940-73 45, 1930-48 SV BT, 1936-47 OHV BT

Thread

7/16"-14

7/16"-14

3/8"-16

Use

Head bolt

Base stud, case

Head nut

Year

1952-56 K, KH

1930-83 BT

1929-39 45, some later G (iron heads)

Thread

3/8"-16

3/8"-24

1/4"-24

Use

Base stud, case

Base stud, nut

Oil pump, cam cover, trans top, etc.

Year

1929-85 45, K, XL

1929-85 45, K, XL

common through 1976

Fuel

Thread

3/4"-20

1/4"-40

1/4"-32

3/4"-18

Use

Linkert bowl lock nut

Linkert needle

Linkert float lever pin, bowl drain

Gas tank petcock

Year

1933-64

1927-64

1927-64

1940-65

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Knuckle, Panhead
1941-54
Pan, Shovelhead
1955-71
Shovelhead
1972-81
45 WL, trike
1937-73
74, 80” Flathead
1937-48
Sportster
1957-*
80”
84”
86”
88”
80”
84”
86”
88”
80”
4-7/16”
4-1/2”
4-5/8”
84”
86”
88”
92”
4-1/2”
4-5/8”
4-13/16”

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"Harley-Davidson" name for reference purposes only. Not affiliated with Harley-Davidson Motor Co.

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