Mining & Metallurgy Fasteners | 10.9 Anti-Vibration Bolts and Heavy-Duty Hot-Dip Protection
Fastening for screens, crushers, conveyors and dressing structures: 10.9 high-strength bolts with serrated-flange or all-metal locking at vibrating stations under proper preload control; hot-dip (1000 h+ NSS) or Dacromet parts for outdoor and tailings exposure; heavy shed and trestle steelwork bolts matched from the same supply.
Key Technical Challenges
Constant shaking at screens and crushers walks plain nuts loose once transverse slip hits the thread pair
Dust, slurry and tailings water abrade coatings; seized parts then cost hours to remove
Field re-plating of high-strength parts without de-embrittlement causes delayed fractures after assembly
Failure claims are hard to apportion - most root-cause in preload and duty, not the bolt material
Xin Rui Da Fastener Solutions
Locking stack for shaking stations: 10.9 allows the higher clamp load, paired with serrated flange or DIN980 all-metal locks (no nylon above 120°C)
Severe protection: HDG (1000 h+, to 250°C, low embrittlement) or Dacromet (500-1000 h+, hydrogen-free, standard nut fit)
Return broken parts for free fracture analysis - fatigue / overload / hydrogen differentiated within a week with corrective advice
One grade per drawing with torque charts; plated 10.9+ batches run the 190-220°C de-embrittlement bake
Technical Parameters
| Common Grades | 8.8 / 10.9 (GB/T 3098.1) |
| Finish | HDG 1000 h+ · Dacromet 500-1000 h+ |
| Locking | Serrated flange · DIN980 (nylon out >120°C) |
| De-embrittlement | 190-220°C bake on plated 10.9+ |
| Failure Analysis | Fracture surface read, ~1 week |
Frequently Asked Questions
Preload before hardware: torque to chart and audit, and remove transverse slip structurally (stiffeners, larger friction faces); only then move to serrated flange or DIN980 all-metal locks - spring washers do little against transverse vibration.
Read the fracture: beach marks with a fast-fracture zone mean fatigue (usually low preload or bending from misaligned holes); a flat cupped face means one-shot overload; bright intergranular cracking means hydrogen embrittlement, typical after unplated re-plating. Send pieces back - free read, verdict in about a week.
No. Coastal, chemical or de-icing-salt exposure outgrows yellow zinc (96-240 h); specify hot-dip (1000 h+) or Dacromet (500-1000 h+) and write the ISO 9227 hours into the contract for acceptance.
Get a Fastening Solution for This Industry
Send the joint duty — load, media, temperature and size — and our engineers reply with class selection and quotation within 24 hours.