Mounting/backing screws for lug casings and other shell-mounted hardware.

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Camco

Camco lug mounting screws
Camco lug mounting screws, Oaklawn era. 10-24 threads.

Gretsch

Gretsch Rocket lug mounting screws
Three different styles of Gretsch Broadkaster Rocket lug mounting screws and washers. 12-24 threads.
Gretsch round badge lug backing screws
Gretsch round badge lug backing screws, introduced when their lug style changed in the early 1950s. 8-32 threads. Generally matte zinc finish, with separate nickel round washers.
Gretsch round badge lug backing screws
A variety of lengths of the same style screw were used for various hardware and shell thicknesses. This can make finding the correct length difficult for restoration work.
Gretsch muffler mounting screws
Gretsch used 6-28 screws and speed nuts for Renown strainer and butt plates as well as tom and snare mufflers.
Gretsch Pratt bass drum muffler mounting screws
Beginning in the 50s for the Pratt bass drum muffler, Gretsch used 8-28 Phillips head countersink screws (and corresponding larger speed nuts). Early examples used hex nuts. This was a very early example of US drum maker using a Phillips head fastener.
Gretsch began using these hex head bolts with captive star washers in the late 1960s. They are the same thread as the earlier slot head round badge screws, and some sets had a mix of both types. There were two different lengths that corresponded to their two shell thicknesses. 8-32 threads.
They began using self-tapping versions sometime in the 70s, which have led to a fair amount of stripped lug thread housings.
Gretsch 00s mounting screws
Modern Gretsch mounting screws look much the same as those used in the 70s. These screws are from a 2000s strainer.

Kent

Kent lug backing screws
Kent lug mounting screws from their US-made drums. Late 1940s through perhaps early 60s. 10-24 threads.

Leedy

Leedy self-aligning lug mounting screws
Leedy self-aligning lug mounting screws and backing plates. 6-32 threads.
Leedy box lug mounting screws
Leedy box lug mounting screws, 1920s-30s. 8-32 threads.
Leedy Conn era lug mounting screws
Leedy Conn era lug mounting screws. 1930-mid-50s. These are later versions; earlier ones were nickel plated. 10-24 threads.

Ludwig

Ludwig & Ludwig lug backing screws
Ludwig & Ludwig lug mounting screws, 1920s-40s and possibly used even earlier. These are from wood shell drums; their metal snares used cup washers. 8-32 threads. 
Ludwig 3-ply lug mounting screws
Ludwig 3-ply lug mounting screws, 60s or early 70s. 8-32 threads.
Ludwig 6-ply mounting screws, introduced in the 1970s as longer versions of the 3-ply screws. Both original and the later self-tapping versions are shown.
Ludwig lug screws and cup washers from Supraphonic or Acrolite snare drums. Later versions had a slot cut into the hex head. Similar cup washers were also used on some mounts and brackets. 
Ludwig mounting cup washers, 1960s-80s
These logo washers were used with 1610 and other bracket mounting hardware. 1960s-80s.
Ludwig slotted head lug mounting screws
Ludwig slotted head lug mounting screws, 8-32 threads.

Pearl

Pearl mounting screws
Pearl mounting screws, 4mm-.7 threads

Rogers

Rogers bread and butter lug backing screws
Rogers bread and butter lug backing screws, 1950s-early 60s. 10-24 threads. Note the two different sizes of captive round washer, though these screws all came from the same drum. The larger washers were for the rear ends of the lugs, where outward tension on the shell would be greater. As the bread and butter lug mounting screw housing was flush against the shell, some drums had these screws installed with small metal guard shims to protect the wood under high tension (as if the lugs themselves would withstand it).
Rogers lug washers , 1960s-70s
These star/tooth washers were used with 8-32 lug screws before Rogers began utilizing captive washers. 1960s-early 70s.
Rogers Fullerton era lug mounting screws
Rogers Fullerton era lug mounting screws. 8-32 threads. Earlier versions were hex head without the slot.

Slingerland

Slingerland Radio King lug backing screws
Slingerland Radio King lug mounting screws, late 1930s- through sometime in the 40s. 8-32 threads, 3/8" and 5/8" lengths. The longer screws were needed for where the large reinforcement rings protruded under part of the lug.
Slingerland Radio King lug backing screws
A later version of the Radio King mounting screws, with captive star washers. These were sometimes used alongside the earlier style on the same drum. 
Slingerland Radio King mounting screw washers
Slingerland logo cup washers, from left to right: 20s eyelet guide platform; early 40s, later 40s, and early 50s lug mounting washers.
Slingerland Radio King mounting screw washers
Each subsequent version of these parts was lighter and thinner than its predecessor.
Slingerland Radio King mounting screw washers
These Radio King floor tom bracket mounting washers have larger holes. A few different versions are shown.
Slingerland 50s lug mounting screws
Slingerland 50s lug mounting screws, a style introduced with the Sound King lugs.
Slingerland 50s lug mounting screws
1/4" and 3/8" lengths, 8-32 threads.
Slingerland 50s lug mounting screws
Slingerland late 50s through early to mid-60s lug mounting screws. Similar to the previous version but with an X rather than simple slot. 1/4" versions were nickel plated.
Slingerland 50s lug mounting screws
Similar to the previous version but with an X rather than simple slot. 1/4" versions were nickel plated.
Slingerland 50s lug mounting screws
The longer, 3/8" version of the same style from the same era was zinc plated. 
Slingerland 50s lug mounting screws
8-32 threads.
Slingerland Set-o-Matic mounting washers
Slingerland Set-o-Matic bracket mounting washers, 1960s-70s
Slingerland Sound King bracket mounting screws
Slingerland Sound King spur bracket mounting screws. 10-32 threads.
Slingerland lug mounting screws 1970s 80s
Slingerland lug mounting screws 1970s-80s. Small hex head the same size as Ludwig's mounting screws, large washers. 8-32 threads.

WFL

WFL logo mounting cup washers
Several varieties of WFL lug mounting washers. 1930s-50s.

Yamaha

Yamaha 60s mounting screws
Yamaha lug mounting screws and separate washers, 1960s-70s. 4mm-0.7 threads.