How long are the screws in Meade LX200 Barlow / eyepiece retaining screw?

The records range from 4 to 8 mm depending on the position, so match each screw to its own hole.

What is the thread pitch of an M3 screw?

0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.

What screwdriver do I need for Meade LX200 Barlow / eyepiece retaining screw?

The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.

Can I use an imperial screw instead of M3?

No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for Meade LX200 Barlow / eyepiece retaining screw?

TechSpareWarehouse (our own store) lists M3 x 4mm, M3 x 5mm and M3 x 6mm, which match lengths in the records above.

Meade LX200 Barlow / eyepiece retaining screw screw size

M3 · 4 to 8 mm long

Meade LX200 Barlow / eyepiece retaining screw takes M3 metric screws in lengths from 4 to 8 mm.

Where it is used: M3 x 0.5 retaining screw reported for Meade 1.25in 2x Ultima Barlow.

This entry is marked reported and comes from scopestuff.com.

For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.

Meade LX200 Barlow / eyepiece retaining screw screw specifications

One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.

Thread	Length	Pitch	Head	Drive	Where it goes	Status
M3	4–8 mm	0.5 mm	not stated	not stated	M3 x 0.5 retaining screw reported for Meade 1.25in 2x Ultima Barlow	Reported

Fitment records and sources

M34-8mmreported

M3 x 0.5 retaining screw reported for Meade 1.25in 2x Ultima Barlow

pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10

Source

How to check the screw before you buy

Do not confuse metric mounting screws with the 1/4-20 or 3/8-16 tripod threads that cameras and clamps also carry.
Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.5 mm from one thread crest to the next (20 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
The records span 4–8 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
Tightening: no device-specific torque is published in these records. The site's general figure for M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M3

Telescope thumbscrews are sold in a wide non-metric legacy range too (1/4-20, 8-32, 10-32 on many Meade/Celestron mounts), so metric M3/M4 fitment applies mainly to newer/international accessory ecosystems (SkyWatcher, generic 1.25" accessories) and should not be assumed universal.
Drill chuck retaining screws are commonly LEFT-HAND thread (e.g. M6 x 1.0 LH) — turn clockwise to remove.

Pitch gauge · Screw size finder · Torque guide

Buy these screws at TechSpare Warehouse

In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.

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The same screw also fits

Devices whose records share a thread with Meade LX200 Barlow / eyepiece retaining screw, closest length match first.

Wooden Camera 153200 SSD Guard (RED SCARLET) also M3 × 8 mm
Holosun SCS mounting screw (Walther PDP) also M3 × 6.5 mm
Universal Red Dot Pattern Mounting Plate (fits Vortex Viper, Burris Fast Fire 3, UTG Reflex Micro Dot, TruGlo Tru-Tec, Crimson Trace CTS-1250, Springfield Dragonfly) also M3 × 8 mm
Airsoft red dot sight mounting screw set (Laylax/Quintes Sence) also M3 × 7.5–8 mm
Slim optical drives (9.5 / 12.7mm) also M3 × 4 mm
Celestron collimation screws, C5/C6/C8 SCT optical tubes also M3 × 8 mm
Gimbal / quick-release plate clamp also M3 × 6–8 mm
Aimpoint Micro T-1/T-2/H-1/H-2 standard mount also M3 × 4 mm

Questions about Meade LX200 Barlow / eyepiece retaining screw screws

What size screw does Meade LX200 Barlow / eyepiece retaining screw use?: M3 × 4–8 mm for M3 x 0.5 retaining screw reported for Meade 1.25in 2x Ultima Barlow.
How long are the screws in Meade LX200 Barlow / eyepiece retaining screw?: The records range from 4 to 8 mm depending on the position, so match each screw to its own hole.
What is the thread pitch of an M3 screw?: 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
What screwdriver do I need for Meade LX200 Barlow / eyepiece retaining screw?: The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
Can I use an imperial screw instead of M3?: No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for Meade LX200 Barlow / eyepiece retaining screw?: TechSpareWarehouse (our own store) lists M3 x 4mm, M3 x 5mm and M3 x 6mm, which match lengths in the records above.

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