| Connection | Common Bolt |
| Standard | ANSI |
| Grade | 8.8 |
| Application | Machinery, Chemical Industry, Environmental, Building |
| Finish | Black |
| Transport Package | Plywood Case |
| Trademark | Donghuang, Oem, Odm |
| Origin | China |
| HS Code | 8474209000 |
Product Appearance
The Grade 8.8 Black Ball Mill Liner Bolt features a distinct, functional design optimized for industrial durability and ease of use:
Oval Head: A hot-forged oval head (not round or hexagonal) that fits seamlessly with curved or flat liner surfaces, eliminating snagging on moving parts and ensuring uniform pressure distribution across the liner.
Black Finish: A corrosion-resistant black oxide coating (electroplated or heat-treated) that shields the bolt from moisture, dust, and chemical exposure—extending its service life in damp or dusty mines/cement plants.
Threaded Shaft: A long, precision-threaded shaft (available in custom lengths) with deep, sharp threads that grip liner and machinery shells tightly, resisting loosening under continuous vibration.
Sealing Compatibility: The head design accommodates optional sealing rings (sold separately) to prevent dust or liquid ingress between the bolt and liner, further enhancing machinery protection.
Core Advantages
Enhanced Safety & Easy Installation
The Grade 8.8 Oval Head Liner Bolt enables external installation—workers can fasten or replace bolts from outside the mill/crusher, avoiding entry into high-risk internal spaces (where moving parts or falling debris pose hazards). This design reduces workplace accidents.
Superior Durability & Load Resistance
Made from heat-treated alloy steel, the bolt achieves a tensile strength of 800 MPa (meeting Grade 8.8 standards) and can withstand dynamic loads of up to 50 kN—far exceeding the requirements of standard industrial bolts. Its hot-forged head resists cracking under impact, even when machinery operates at full capacity.
Reduced Downtime & Higher Productivity
By preventing liner shifting and loosening, the bolt cuts unplanned maintenance time by 40%. Its corrosion-resistant black finish also extends replacement cycles—from 6 months (standard bolts) to 18 months in harsh environments—reducing production interruptions.
Quality Assurance
We implement a strict, multi-stage quality control process to ensure every Grade 8.8 Black Ball Mill Liner Bolt meets global standards:
Raw Material Inspection: All alloy steel is tested for chemical composition (e.g., carbon, chromium content) and tensile strength before production.
In-Process Testing: After forging, threading, and coating, each bolt undergoes dimensional checks (thread pitch, head shape) and hardness testing (using Rockwell scales).
Finished Product Verification: 100% of finished bolts are inspected for black finish adhesion (tape test) and load resistance (simulated vibration tests) to confirm compliance with ANSI and customer specifications.
Certifications: Our production facility holds ISO 9001:2015 certification, and each batch of bolts comes with a quality inspection report for traceability.
FAQ
Are you a direct manufacturer of Grade 8.8 Oval Head Liner Bolts?
Yes, we are a professional manufacturer with our own production plant and international sales team. We control the entire process—from raw material sourcing to delivery—ensuring competitive prices and consistent quality for ball mill liner bolts.
Can you provide custom Black Ball Mill Liner Bolts (e.g., different lengths or thread sizes)?
Absolutely. We offer customizations for length (100mm–500mm), thread type (metric/imperial), and even head shape (per customer drawings). Custom orders typically take 15–20 days, depending on specifications.
What is the minimum order quantity (MOQ) for Grade 8.8 Liner Bolts?
The MOQ for standard bolts is 500 pieces. For custom designs, the MOQ is 1,000 pieces—we also accept small trial orders (200–300 pieces) for new customers.
