OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern) screw size
M3 · 8 mm long
OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern) takes M3 metric screws, 8 mm long.
It is listed for mounting screws attaching red dot sight to adapter plate, torqued to 12 in-lbs.
This entry is marked confirmed and comes from 4shooters.com.
An M3 screw is 3 mm in diameter with a 0.5 mm pitch, tapped with a 2.5 mm drill; imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern) screw specifications
One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Torque | Where it goes | Status |
|---|---|---|---|---|---|---|---|
| M3 | 8 mm | 0.5 mm | not stated | not stated | 12 in-lbs | mounting screws attaching red dot sight to adapter plate, torqued to 12 in-lbs | Confirmed |
Fitment records and sources
mounting screws attaching red dot sight to adapter plate, torqued to 12 in-lbs
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Outdoor hardware should be stainless or coated to stop corrosion seizing it in place.
- 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.
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.
- GoPro's own official Dive Housing user guide does not itself state a metric screw size for the housing body; only third-party accessory manufacturer (INON) manuals explicitly cite M6 screws for their add-on arms/adapters attaching to the housing.
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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Devices whose records share a thread with OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern), closest length match first.
- OuterImpact Red Dot Adapter Plate (Vortex Viper / Burris Fast Fire pattern) also M3 × 8 mm
- Fishing reel handle and drag knob also M3 × 8 mm
- NEMA 17 stepper motor face also M3 × 8 mm
- FPV flight controller stack 30.5x30.5mm also M3 × 8 mm
- Amiga 500 rear/front case screws (Retro32 replacement set) also M3 × 8 mm
- MGN12 linear rail also M3 × 8 mm
- 2020 extrusion T-nuts (light duty) also M3 × 8 mm
- SISAB ECO.50+/T laboratory centrifuge also M3 × 8 mm
Questions about OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern) screws
- What size screw does OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern) use?
- M3 × 8 mm for mounting screws attaching red dot sight to adapter plate, torqued to 12 in-lbs.
- How long are the screws in OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern)?
- 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 OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern)?
- 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.
- How tight should the M3 screw on OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern) be?
- The source gives 12 in-lbs for mounting screws attaching red dot sight to adapter plate, torqued to 12 in-lbs.
- Where can I buy replacement screws for OuterImpact Micro Red Dot Adapter Plate (Swampfox pattern)?
- TechSpareWarehouse (our own store) lists M3 x 8mm, which matches the length in the records above.