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English (United Kingdom) HYTORC Backup Washer
The HYTORC Backup Washer eliminates the need for backup wrenches, improving the safety and efficiency of the overall bolting operation. Its unique knurled surface ensures the backup washer and back nut will not rotate during tightening.
ASTM F3394/F3394M Standard Specification for Hardened Washers
The HYTORC Backup Washer is manufactured in accordance with the requirements in the ASTM F3394/F3394M Standard Specification for Hardened Steel Backup and Reaction Washers. This standard covers general-purpose mechanical and structural use of washers with bolts, nuts, studs, Direct Tension Indicators and other threaded fasteners.Pinch-Point Free
Unlike conventional bolting, use of the HYTORC Backup Washer eliminates pinch points on the passive side of the flange by eliminating the need for backup wrenches, making the job inherently safer.Speed
Without the need for backup wrenches, jobs are completed faster and safety is improved, not compromised.Knurled Surface
The unique knurl design ensures the backup washer and back nut will not rotate during tightening.Proven Technology
The HYTORC Backup Washer is already being used on hundreds of job sites with great success and is included in Original Equipment Manufacturer (OEM) designs.Documentation
Imperial
Metric
Nominal Backup Washer Dimensions (Inch)
| Bolt | Part No. | Inside Diameter (ID) | Outside Diameter (OD) | Thickness (T) |
| 1/2" | ZBW008 | 0.531" | 1.005" | 0.123" |
| 9/16" | ZBW009 | 0.625" | 1.086" | 0.123" |
| 5/8" | ZBW010 | 0.688" | 1.227" | 0.13" |
| 3/4" | ZBW012 | 0.813" | 1.449" | 0.152" |
| 7/8" | ZBW014 | 0.938" | 1.65" | 0.152" |
| 1" | ZBW100 | 1.063" | 1.87" | 0.158" |
| 1-1/8" | ZBW102-M30 | 1.241" | 2.092" | 0.19" |
| 1-1/4" | ZBW104-M33 | 1.351" | 2.309" | 0.19" |
| 1-3/8" | ZBW106-M36 | 1.497" | 2.526" | 0.193" |
| 1-1/2" | ZBW108-M39 | 1.597" | 2.742" | 0.193" |
| 1-5/8" | ZBW110-M42 | 1.708" | 2.959" | 0.245" |
| 1-3/4" | ZBW112-M45 | 1.823" | 3.175" | 0.245" |
| 1-7/8" | ZBW114-M48 | 1.977" | 3.392" | 0.248" |
| 2" | ZBW200-M52 | 2.135" | 3.608" | 0.263" |
| 2-1/4" | ZBW204-M56 | 2.341" | 4.12" | 0.295" |
| 2-1/2" | ZBW208-M64 | 2.662" | 4.5" | 0.335" |
| 2-3/4" | ZBW212 | 2.863" | 4.92" | 0.335" |
| 3" | ZBW300 | 3.117" | 5.25" | 0.405" |
Nominal Backup Washer Dimensions (mm)
| Bolt | Part No. | Inside Diameter (ID) | Outside Diameter (OD) | Thickness (T) |
| M14 | ZBW-M14 | 15.1 | 25.5 | 3.1 |
| M16 | ZBW-M16 | 17.1 | 27.6 | 3.1 |
| M18 | ZBW-M18> | 19.4 | 31.2 | 3.3 |
| M20 | ZBW-M20 | 21.2 | 34.6 | 3.3 |
| M22 | ZBW-M22 | 23.2 | 36.8 | 3.9 |
| M24 | ZBW-M24 | 25.5 | 41.9 | 4 |
| M27 | ZBW-M27 | 28.8 | 47.5 | 4 |
| M30 | ZBW102-M30 | 31.5 | 53.1 | 4.8 |
| M33 | ZBW104-M33 | 34.3 | 58.6 | 4.8 |
| M36 | ZBW106-M36 | 38 | 64.2 | 4.9 |
| M39 | ZBW108-M39 | 40.6 | 69.6 | 4.9 |
| M42 | ZBW110-M42 | 43.4 | 75.2 | 6.2 |
| M45 | ZBW112-M45 | 46.3 | 80.6 | 6.2 |
| M48 | ZBW114-M48 | 50.2 | 86.2 | 6.3 |
| M52 | ZBW200-M52 | 54.2 | 91.6 | 6.7 |
| M56 | ZBW204-M56 | 59.5 | 104.6 | 7.5 |
| M60 | ZBW-M60 | 64.1 | 104.6 | 7.4 |
| M64 | ZBW208-M64 | 67.6 | 114.3 | 8.5 |
| M68 | ZBW-M68 | 70.2 | 114.3 | 8.5 |
| M72 | ZBW-M72 | 73.9 | 125 | 8.5 |
| M76 | ZBW-M76 | 78 | 125 | 8.5 |
| M80 | ZBW-80 | 82 | 133.4 | 10.3 |
