Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter screw size
M4 / M6 · 101.6 mm long
Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter takes M4 and M6 metric screws, 101.6 mm long.
There are 2 separate fitment records for it, including M4 tapped hole in one end (M4) and M6 tapped hole in opposite end from M4 hole (M6).
2 of the 2 records are marked confirmed, drawn from 1 source (newport.com).
M4 means a 4 mm nominal diameter with a 0.7 mm thread pitch. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter 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 |
|---|---|---|---|---|---|---|
| M4 | 101.6 mm | 0.7 mm | not stated | not stated | M4 tapped hole in one end | Confirmed |
| M6 | 101.6 mm | 1 mm | not stated | not stated | M6 tapped hole in opposite end from M4 hole | Confirmed |
Fitment records and sources
M4 tapped hole in one end
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
M6 tapped hole in opposite end from M4 hole
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
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 M4 screw measures about 4 mm with calipers (usually a hair under). This device also uses M6, so measure each screw rather than assuming they match.
- Pitch: 0.7 mm from one thread crest to the next (14.29 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 101.6 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 M4 heads take PH2 for Phillips and T20 for Torx, and a 3 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 M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4 / M6
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
- Optical breadboards are metric only when the part number ends in /M; the default in North America is 1/4-20.
- Optical tables come in metric (M6 on 25mm centres) and imperial (1/4-20 on 1in centres) — mixing them cross-threads the table.
More in Cameras & Optics
1.25" eyepiece/diagonal/SCT visual back thumb screwAimpoint Comp M4 / M4s LRP & TNP mountAimpoint Micro T-1/T-2/H-1/H-2 standard mountAimpoint Micro T-1/T-2/H-1/H-2 standard mount screwAimpoint SM-2001/2007 Micro T1/T2 mountAirsoft red dot sight mounting screw set (Laylax/Quintes Sence)Airsoft/firearm red-dot sight optic mounting screws (Vortex Viper, Swampfox patterns)Alpine and touring ski bindings (Binding Freedom inserts)Arca-style quick-release plateARRI plate for Sony VENICE 1/2Artesky 340mm Vixen Dovetail BarAstromania finder scope dovetail base
Browse all 278 in Cameras & Optics →The same screw also fits
Devices whose records share a thread with Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter, closest length match first.
- Celestron collimation screws, C8/C9.25/C11 SCT optical tubes also M4
- Celestron NexStar 8 eyepiece holder set screws also M4
- SIG SAUER ROMEO-RS reflex sight, mounting to SIG Pro-cut slides / P365 slides with M4 mount holes also M4
- Main barrel / eyepiece extension tube holder set screws also M4
- Nextbase Dashcam Universal Mount also M6
- Thorlabs KM200CP/M kinematic mount for 2-inch optics also M4
- Thorlabs FW103/M motorized filter wheel also M4
- DJI RS series gimbals (RS 5, RS4 Pro, RS4, RS3 Mini/Pro/3, RS2, RSC2) also M4
Questions about Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter screws
- What size screw does Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter use?
- M4 × 101.6 mm for M4 tapped hole in one end; M6 × 101.6 mm for M6 tapped hole in opposite end from M4 hole.
- How long are the screws in Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter?
- The record gives 101.6 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for Newport M-SP-4 optical post, 101.6mm height, 12.7mm diameter?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.