Square key head tension rods for toms and snares (and in rare instances bass drums).

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Duplex

Duplex 30s tension rods
Duplex tension rods from a 1920s or 30s snare drum. 12-24 threads, very similar to 1910s Ludwig & Ludwig.

Gretsch

Gretsch tension rods, 1950s-60s. Similar to concurrent Slingerland, matte finish and taller washers
Gretsch tension rods, 1970s-80s. Very similar to Slingerland from the same period.

Leedy

Leedy slot head tension rods, 1900s
Leedy slot head tension rods, 10-24 threads. Early 1900s.
Leedy 30s 10-24 tension rods
Leedy tension rods, late 1930s. 10-24 threads. These fit some of the last box lugs that Leedy produced.

Ludwig

Ludwig & Ludwig 1910s tension rods
Ludwig & Ludwig 1910s tension rods and washers
Ludwig & Ludwig 1910s tension rods
This head style would be used throughout the Conn era but with a thicker, stepped base.
Leedy & Ludwig Conn era tension rods
Ludwig & Ludwig/Leedy & Ludwig Conn-era tension rods, 1930s-50s. Found on other brands as well and perhaps made by an outside company.
Ludwig & Ludwig 1940s tension rods
Ludwig & Ludwig tension rods, late 1940s. Tall square head with no slope at the base, unlike most Conn-era Ludwig rods.
Ludwig tension rods
Ludwig tension rods, 1960s-70s.
Later rods were very similar with taller heads.

Pearl

Pearl tension rods 1960s MIJ
Pearl tension rods, 1960s-earl 70s. A spartan style used on a wide variety of stencil brands.

Premier

Premier tension rods
Premier slot head tension rods, 1960s-70s
Notable for a short threaded section wider than the upper shaft.

Rogers

rogers tension rods
rogers tension rods, 1950-early 60s
rogers tension rods
Bread & butter lug era. Matte plating, with a diamond-shaped indent on top
rogers tension rods
rogers tension rods, 1960s-70s. Similar to Ludwig but with a steeper pitch on the head

Slingerland

Slingerland 1930s Artist model snare tension rods
Slingerland tension rods from an Artist model snare drum, 1930s
Slingerland 1930s Artist model snare tension rods
Tall square head with a slight taper, no band below the collar.
Slingerland Radio King tension rod head styles
Three different styles of Slingerland Radio King tension rods, 1930s-50s.
Slingerland tension rods 1950s-60s
Slingerland post-Radio King rods, 1950s-60s. Earlier versions were taller, later ones had rounded heads.

Sonor

Sonor slot head 1/4-20 tension rods
Sonor slot head tension rods from a teardrop lug tom. 1/4-20 threads. Very similar styles are still in use today on their top lines.

Star/Hoshino Gakki

Star/Hoshino Gakki tension rods
Star/Hoshino Gakki/proto-Tama tension rods, 1960s. Star was alone in using the 5mm-0.9 thread for their toms and snare rods.
Star/Hoshino Gakki tension rods
Another Star tension rod style, presumably later. Shinier finish with a slope at the base of the head. These are still 5mm-0.9 thread.

Trixon

Trixon tension rods, 1950s-60s.
Trixon tension rods
These are a fine metric thread

WFL

wfl tension rods
wfl tension rods, 1930s-40s. By Walberg & Auge.
WFL tension rods
WFL tension rods, 1950s
WFL tension rods
This became the Ludwig design after Conn sold the Ludwig name

Zickos

Zicos tension rods and lug inserts. 1/4-20 threads.