Newport M-SP-2 optical post screw size
M4 / M6 · length not stated in the sources
Our records put Newport M-SP-2 optical post on M4 and M6 screws. None of the sources we found gives an exact length, so measure the original before you order.
There are 2 separate fitment records for it, including M4 tapped hole in one end (M6 in the other), 50.8 mm post (M4) and M6 tapped hole in one end (M4 in the other), 50.8 mm post (M6).
2 of the 2 records are marked confirmed, drawn from 1 source (newport.com).
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Newport M-SP-2 optical post 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 | not stated | 0.7 mm | not stated | not stated | M4 tapped hole in one end (M6 in the other), 50.8 mm post | Confirmed |
| M6 | not stated | 1 mm | not stated | not stated | M6 tapped hole in one end (M4 in the other), 50.8 mm post | Confirmed |
Fitment records and sources
M4 tapped hole in one end (M6 in the other), 50.8 mm post.
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
M6 tapped hole in one end (M4 in the other), 50.8 mm post.
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.
- 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.
- TS-Optics Losmandy-style dovetail bars drill through-holes sized to accept either M6 metric screws or 1/4" imperial screws interchangeably in the same countersunk holes.
More in Cameras & Optics
The same screw also fits
Devices whose records share a thread with Newport M-SP-2 optical post, closest length match first.
- i-PRO / Panasonic WV-QWL100 camera mount bracket also M4
- Vivotek IT9360-H / IT9380-H dome camera also M4
- EchoMaster PCAM-JP3 spare-tire mount camera also M6
- OpenFlexure Delta Stage frame also M4
- Edmund Optics metric post kit also M4
- Gimbal stabilizer arm clamp also M4
- Thorlabs ELL21/M rotation mount also M4
- Optic/scope ring mounting screw manufactured to engineering drawing (fastener supplier drawing, generic optics mount hardware) also M4
Questions about Newport M-SP-2 optical post screws
- What size screw does Newport M-SP-2 optical post use?
- M4 for M4 tapped hole in one end (M6 in the other), 50.8 mm post; M6 for M6 tapped hole in one end (M4 in the other), 50.8 mm post.
- How long are the screws in Newport M-SP-2 optical post?
- None of the sources states a length. Remove one screw and measure it from under the head to the tip (overall for a countersunk head).
- 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-2 optical post?
- 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.