STB-1 Thermal Break washers and bushings can be used on the warm face of the structure, and including a thermal break at the bolt connection will reduce heat loss an additional 4% per bolt, depending on the wall assembly connection. Without these thermal break solutions, condensation can occur on the bolt heads which can develop into damp and mold issues.
| Bolt Size | Washer | Washer | Bushing | Bushing |
|---|---|---|---|---|
| Diameter - Inches / MM | OD - Inches / MM | ID - Inches / MM | OD - Inches / MM | ID - Inches / MM |
| 3/16" (M5) | 9/16" (14.29) | 1/4" (6.40) | 1/2" (12.7) | 1/4" (6.40) |
| 1/4" (M6) | 3/4" (19.05) | 5/16" (7.94) | 9/16" (14.29) | 5/16" (7.94) |
| 5/16" (M8) | 7/8" (22.23) | 3/8" (9.53) | 5/8" (15.88) | 3/8" (9.53) |
| 3/8" (M10) | 1" (25.4) | 7/16" (11.11) | 11/16" (17.46) | 7/16" (11.11) |
| 7/16" (M12) | 1 1/4" (31.75) | 1/2" (12.70) | 3/4" (19.05) | 1/2" (12.70) |
| 1/2" (M12) | 1 3/8" (34.93) | 9/16" (14.29) | 13/16" (20.64) | 9/16" (14.29) |
| 9/16" (M14) | 1 1/2" (38.10) | 5/8" (15.88) | 7/8" (22.23) | 5/8" (15.88) |
| 5/8" (M16) | 1 3/4" (44.45) | 11/16" (17.46) | 15/16" (23.81) | 11/16" (17.46) |
| 3/4" (M20) | 2" (50.80) | 13/16" (20.64) | 1 1/16" (26.99) | 13/16" (20.64) |
| 7/8" (M22) | 2 1/4" (57.15) | 15/16" (23.81) | 1 3/16" (30.16) | 15/16" (23.81) |
| 1" (M25) | 2 1/2" (63.50) | 1 1/16" (26.99) | 1 5/16" (33.34) | 1 1/16" (26.99) |
