BX
BUMAX Tightening Torque & Load Tables
Grade finder · Full specification data · Application matching
BUMAX Technical Data

Start with what you know. Select your bolt size — the full table loads immediately. Add filters as you go to highlight the grades that match your application. Click any grade row to see a plain-English explanation.

1
Pick bolt sizeThread standard and size
2
Add filtersLoad requirements and application context — all optional
3
Read the tableQualifying grades stay bright · non-qualifying grades dim · click any row to expand
Bolt size
Load requirements (leave blank if unknown)
Industry / environment (select all that apply)
Marine / offshore
Oil & gas
Construction
Aerospace / aviation
Military / defense
Automotive
Electronics
Agriculture / mining
Food & beverage
Chemical / process
Cleanroom / medical
General industrial
Vibration
No vibration
Moderate vibration
High / constant vibration
Temperature
Ambient (up to 100°C / 212°F)
Elevated (100–300°C / 212–572°F)
Extreme (>300°C / 572°F)
Other constraints
Weight critical
Compact / small space
Non-magnetic required
All grades
Assembly note: Use a very low-revolution screw-driving machine, or tighten by hand. Do not use impact/punching drivers. MoS₂ lubricant or similar is recommended in unfavourable conditions. Contact BUMAX technical service if thread galling occurs.
1 Torque assumes burr-free surfaces with quality lubricant (µ = 0.14). Insufficient lubrication may cause significant preload variation.  |  2 Preload = 65% of Rp0.2; expect ±23% variation in practice.  |  3 BUMAX Ultra (class 159) is custom-engineered per application — contact BUMAX for details.

Ready to move forward?

Share your grade selection with a BUMAX representative to request a quote or application samples.