Anyone who has bolted joints together knows the frustration of the back nut turning when tightening the front nut, preventing the bolt or stud from tightening. The solution up to now was to use a helper with either a large back-up wrench or a back-up wrench with a screw release – both slow processes. Trybar’s Multinut® comes in two styles, either two tapped semi-circles (“Crescents”) for smaller flanges, or paired nuts (“Twins”) for larger ones. Designed primarily for frequent re-use when testing flanged connections, they can be left on permanently if desired.
Crescent Style Back-up Nut
Twin Style Back-up Nut
Patent Pending
Availability
Thread pitches
Threads up to and including 1” are UNC. 1” and above are 8UN (8 threads per inch).
1” UNC is 8 threads per inch (TPI).
Materials
|
Multinut Style |
| Material Code |
Crescent |
Twin |
| 1 |
4000 series alloy steel |
ASTM A194 2H nuts |
Part Number Example
| Flange Size Code |
Pressure Rating |
Style |
Material |
| B6 |
1500 |
C |
1 |
ANSI B16.5, 2”, 1500#, Crescent style, 4000 series alloy steel
Quantity needed per flange
Crescent style: two per flange
Twin style: one for every two bolts (e.g.: a 12 bolt flange will need 6 Twin Multinuts)
