What size screw does Backscatter FLIP3.1 underwater filter frame screws (2x) use?

M3 × 8 mm for screw kit listing: two M3 x 8mm filter screws.

How long are the screws in Backscatter FLIP3.1 underwater filter frame screws (2x)?

The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.

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 Backscatter FLIP3.1 underwater filter frame screws (2x)?

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 Backscatter FLIP3.1 underwater filter frame screws (2x)?

TechSpareWarehouse (our own store) lists M3 x 8mm, which matches the length in the records above.

Backscatter FLIP3.1 underwater filter frame screws (2x) screw size

M3 · 8 mm long

Our records put Backscatter FLIP3.1 underwater filter frame screws (2x) on M3 screws, 8 mm long.

The record covers screw kit listing: two M3 x 8mm filter screws.

This entry is marked confirmed and comes from backscatter.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.

Backscatter FLIP3.1 underwater filter frame screws (2x) 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	8 mm	0.5 mm	not stated	not stated	Screw kit listing: two M3 x 8mm filter screws	Confirmed

Fitment records and sources

M38mmconfirmed

Screw kit listing: two M3 x 8mm filter screws

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

Source

How to check the screw before you buy

If several screws hold the same part, check that they are all the same length before assuming they are.
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 record states 8 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
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

M3 (3.0mm, 0.5mm pitch) is not #6-32 UNC (~3.5mm) — they look identical and cross-thread, the single most common PC-building mistake.

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.

More in Other Equipment

2020 aluminium extrusion T-nuts Acer Aspire / Swift Allen-Bradley PowerFlex 520-series mounting adapter plate Allen-Bradley PowerFlex 750-series Allen-Bradley PowerFlex 750-series I/O shield termination Allen-Bradley PowerFlex 755 IP00 control pod Amiga 500 rear/front case screws (Retro32 replacement set)Arduino Uno / Mega ASUS / MSI / Gigabyte / ASRock motherboards Backscatter FLIP3.1 underwater flip-frame retaining screw Bosch Rexroth swivel-in T-slot nut, slot 8 Bosch Rexroth T-head bolt, slot 8

Browse all 125 in Other Equipment →

The same screw also fits

Devices whose records share a thread with Backscatter FLIP3.1 underwater filter frame screws (2x), closest length match first.

Floyd Rose locking tremolo saddles also M3 × 8 mm
Hotends & heat breaks (E3D and clones) also M3 × 8 mm
Pumpkin SUPERNOVA 6U CubeSat Structure Kit also M3 × 8 mm
Star Micronics mPOP under-counter mount (CM-POP1) also M3 × 8 mm
Third-party Raspberry Pi cases & HAT stacks also M3 × 8 mm
Kenwood TK-8302 transceiver also M3 × 8 mm
Eschmann LS5 / SES2555 autoclave also M3 × 8 mm
2020 aluminium extrusion T-nuts also M3 × 8 mm

Questions about Backscatter FLIP3.1 underwater filter frame screws (2x) screws

What size screw does Backscatter FLIP3.1 underwater filter frame screws (2x) use?: M3 × 8 mm for screw kit listing: two M3 x 8mm filter screws.
How long are the screws in Backscatter FLIP3.1 underwater filter frame screws (2x)?: The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
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 Backscatter FLIP3.1 underwater filter frame screws (2x)?: 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 Backscatter FLIP3.1 underwater filter frame screws (2x)?: TechSpareWarehouse (our own store) lists M3 x 8mm, which matches the length in the records above.

Heads up: shipping delay