Black Oxide Hex Head Bolts
Black Oxide Hex Head Bolts are general-purpose carbon steel fasteners manufactured to DIN931, DIN933 and ISO4014 standards. After forming and thread rolling, the surface undergoes black oxide treatment to form a uniform black conversion coating. Black oxide provides mild anti-rust ability for indoor dry environments, with minimal impact on thread tolerance and low production cost.
Handan Hengmai Fasteners Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of black oxide hex head bolts in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality black oxide hex head bolts for sale here from our factory. Customized orders are welcome.
Product Overview
Black Oxide Hex Head Bolts are general-purpose carbon steel fasteners manufactured to DIN931, DIN933 and ISO4014 standards. After forming and thread rolling, the surface undergoes black oxide treatment to form a uniform black conversion coating. Black oxide provides mild anti-rust ability for indoor dry environments, with minimal impact on thread tolerance and low production cost. We produce corresponding black oxide hex nuts in‑house and can deliver bolts‑nuts combined shipments in one batch. Our factory stocks full metric sizes of 4.8 and 8.8 grade, supports full thread and half thread types, and provides economical fastening solutions for general machinery, construction and equipment assembly.
Product Specification
|
Parameter Item |
Standard Index |
|
Material |
Carbon steel |
|
Strength Grade |
Class 4.8, Class 8.8 |
|
Thread Precision |
6g metric coarse thread |
|
Surface Treatment |
Black oxide (oil sealing recommended after treatment) |
|
Size Range |
M6 – M48 |
|
Executive Standards |
DIN933, DIN931, ISO4014, ISO4017 |
|
Type |
Full thread / Half thread |
Product Properties
1. Black oxide surface delivers a neat black appearance and slight anti-rust property for indoor dry workshops;
2. Coating thickness is extremely thin, will not block threads and guarantees smooth bolt and nut matching;
3. Cost-effective for large-volume general assembly projects;
4. Multiple strength grades satisfy medium and light load mechanical connection demands.
Application
Widely used for general machinery assembly, equipment frames, mold accessories, indoor pipeline connection and construction auxiliary fastening.
Notice: Black oxide alone cannot withstand humid outdoor or corrosive environments; electro-galvanized version is recommended for outdoor use.
Quality Control & Testing
All batches implement thread go/no-go inspection, dimensional measurement and hardness sampling. We check surface uniformity and avoid excessive oil contamination. Raw material documents are archived; test reports can be issued for bulk orders.
Packing, Storage, Handling And Transportation
Standard packing: inner moisture-proof PE bags + outer woven bags on pallets. Small orders can use cartons. Black oxide products must be stored in dry conditions to prevent surface rust. We provide FOB, CIF, DDP logistics options.
After‑Sales & Service
Pre-sales engineers evaluate whether black oxide treatment fits your working environment. If unqualified products caused by production problems occur, we arrange free replacement and bear relevant logistics costs.
FAQ
Q1: Are black oxide bolts rust-proof for outdoor use?
A: Not recommended for long-term outdoor exposure. Black oxide only offers limited rust resistance. Choose electro-galvanized or hot-dip galvanized bolts for outdoor projects.
Q2: Do you supply matched black oxide nuts together?
A: Yes, we can provide supporting black oxide hex nuts in the same shipment.
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