Really Right Stuff B2-Pro-II Arca-Swiss clamp screw size
M6 · length not stated in the sources
The screws used on Really Right Stuff B2-Pro-II Arca-Swiss clamp are M6. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: centre socket accepts either 1/4-20 or a metric M6 screw.
This entry is marked likely and comes from photoproshop.com.
M6 means a 6 mm nominal diameter with a 1 mm thread pitch. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6.
Really Right Stuff B2-Pro-II Arca-Swiss clamp 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 |
|---|---|---|---|---|---|---|
| M6 | not stated | 1 mm | not stated | not stated | Centre socket accepts either 1/4-20 or a metric M6 screw | Likely |
Fitment records and sources
Centre socket accepts either 1/4-20 or a metric M6 screw
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
How to check the screw before you buy
- Take one original screw out first and measure it before ordering; the record above tells you the thread, the original screw tells you the exact length and head.
- Diameter: across the threads an M6 screw measures about 6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 1 mm from one thread crest to the next (10 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 M6 heads take PH3 for Phillips and T30 for Torx, and a 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 M6 is about 7-10 N·m into metal threads and 2.5-4.0 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M6
- 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.
- 19-inch racks are not all metric: 10-32 and 12-24 UNC are still the norm in North America, with M6 the metric/square-hole cage-nut option.
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Devices whose records share a thread with Really Right Stuff B2-Pro-II Arca-Swiss clamp, closest length match first.
- Flat-pack furniture cam-lock fittings (IKEA-style knock-down) also M6
- Eaton 93PX UPS/EBM/MBP (15-20 kVA) also M6
- Tecno kart general fasteners also M6
- Maedler worm gear motor HMD/II gearbox size 045 square output flange also M6
- Bosch Rexroth T-head bolt, slot 8 also M6
- Bosch Rexroth swivel-in T-slot nut, slot 8 also M6
- TE SOLISTRAND ring terminal 50719-1 also M6
- USD inline skate frame mounting bolt also M6
Questions about Really Right Stuff B2-Pro-II Arca-Swiss clamp screws
- What size screw does Really Right Stuff B2-Pro-II Arca-Swiss clamp use?
- M6 for centre socket accepts either 1/4-20 or a metric M6 screw.
- How long are the screws in Really Right Stuff B2-Pro-II Arca-Swiss clamp?
- 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 M6 screw?
- 1 mm (coarse), which is the standard pitch for M6 machine screws; a 0.75 mm fine pitch exists but is uncommon. The tap drill is 5 mm and the normal clearance hole is 6.6 mm.
- What screwdriver do I need for Really Right Stuff B2-Pro-II Arca-Swiss clamp?
- The sources do not name the drive. For M6, Phillips heads normally take PH3 and Torx heads T30; socket heads take a 5 mm hex key.
- Can I use an imperial screw instead of M6?
- No. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6. Use a true M6 screw so it does not cross-thread or strip the hole.