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Screw Sizes Database

This is a list of screw and bolt sizes compiled from customer
discovery and trials. Many thanks to those who have contributed!
Please send any additions you discover to


Celestron NexStar 8 eyepiece holder = M4-.7 X 12mm SS round tip
Celestron 1.25" 2x Ultima Barlow "shorty," 1999 (1) M3-.5

Meade LX200 8" & 10" OTA end castings screws (16) = 8-32 x 1/2"
Meade LX200 finderscope mount base (2) = 1/4-20 x 3/4" Nylon
Meade LX200 finderscope mount rings (6) = 10-32 x 3/4" Nylon
Meade 1.25" diagonal prism (eyepiece end) (1) = M3-.5
Meade 1.25" Telenegative Barlow #122, 1998 (1) M3-.5
Meade 2" diagonal (2) = M3-.5
Meade 2" to 1-25" adapter (1) = M4-.7
Meade 1.25" visual back (where the prism goes in) (1) = M4-.7
Meade LX200 8" & 10" Field Tripod leg screws (6) = 1/4-20 x 9/16 rosette head
Meade LX200 Scope base mounting bolts, for wedge mounting (3) = 3/8-16
Meade LX200 Tripod Head mounting bolts, for wedge mounting (3) = 5/16-18

Orion 60mm dovetail finder bracket #05041 (6) = M5-.8 x 12mm
Orion Starmax 127 base mount bolts (2) = M6-1 x 16 Rosette
Orion #07374 rings (2) = 1/4-20 x 3/4" Rosette
Orion 1.25" 2x Deluxe Baffled Barlow, 1997 (1) M3-.5
Orion 1.25" 2x Ultrascopic 3-element Barlow, 1999 (1) M3-.5
Orion 1.25" 45-degree Erect-Image Diagonal, 1999 (1) M3-.5
Orion 5x finder with 3-point adjust, came with 8" DSE 1997 (3) M3-.5

Discovery DHQ 8" dob 1.25" rack and pinion focuser eyepiece screw (2) = M4

Telrad finder base (2) = 6-32 x 3/4" nylon

Lumicon Giant Easy Guider:
Main Barrel, holder ring (telescope side) (3) = 10-32
Main Barrel, camera adapter end (3) = 6-32
Main Barrel, eyepiece extension tube holder (2) = M4-.7
2" Camera adapter (4) = 8-32
Camera T-ring collar (3) = 8-32
Eyepiece Extension tube (2) = 8-32

TeleVue NP-101, TV-101, TV-102, TV-85 and Pronto:
Tube accessory screws to attach finders and accessories to the optical tube = 10-32

NGF-S/SE:
Focuser to LX200 visual back (2) = 6-32 x 3/4"
2" eyepiece screws (2) = 8-32 x 1/2"

Celestar 8 Wedgepod
OTA to Wedgepod (3) = 3/8-16 x 1"
Latitude Lock (4) = 1/4-20 x 3/4"



A great source for thread info for eyepiece barrels & threads:
ATM Page - Eyepiece Barrels & Threads


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