Product Overview
Cal-Royal BB31 NRP 4-1/2 x 4-1/2 Standard Weight Ball Bearing Hinges, Five Knuckle, Non-Removable Pin
- Recommended for medium-frequency usage
- Made with four ball bearing assemblies
- Recommended for use with a door closer
- Packed with fasteners for hollow metal and wood doors
- NRP (non-removable pin) – security feature for outswing doors
| Brand | |
|---|---|
| Finishes |
630 Satin Stainless Steel, 652 Satin Chrome, 633 Satin Brass, US1 (622) Flat Black |
| Hinge Type |
Full Mortise |
| Size |
4.5" x 4.5" |
| Knuckles |
Five |
| Bearings |
Ball Bearing |
| Gauge |
0 .134 |
| Material |
1040 steel or 304 series stainless steel |
| Usage |
Medium Duty |
Cal-Royal BB31 NRP 4.5" x 4.5" Ball Bearing Hinge (Non-Removable Pin)