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Русский Black Oxide Hex Bolts Supplier for Industrial Metric Assemblies
XZ Fastener supplies black oxide hex bolts for machinery, equipment assembly, tooling, automotive repair, and indoor industrial fastening programs. Black oxide provides a dark appearance, light dimensional impact, and an oil-retained surface often requested for Grade 8.8 carbon steel hex bolts, DIN 933 full thread hex bolts, DIN 931 partial thread bolts, and other metric hex head bolts. The finish is suitable when buyers need a clean black surface rather than heavy outdoor corrosion protection. Sizes, grades, thread length, oiling, packaging, and inspection items can be supplied according to order requirement.
Quick Specs
What Buyers Should Know Before Sourcing Black Oxide Hex Bolts
Black oxide hex bolts are commonly chosen for appearance, low coating build-up, and reduced glare in machinery or equipment assemblies. The finish changes the surface color without adding a thick zinc or galvanized layer, so it usually has less influence on thread fit than heavier coatings. For standard metric supply, buyers often request black oxide carbon steel hex head bolts in DIN 931 or DIN 933 style.
Black oxide is not the same as hot dip galvanizing or zinc plating. It provides limited corrosion resistance unless oiling, packaging, storage, and final application conditions are managed properly. For outdoor projects, buyers may need to compare zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts before confirming the purchase plan.
Procurement tip: If your drawing only says “black bolt,” confirm whether the requirement is black oxide, black phosphate, black zinc, black paint, or another dark finish. The cost, corrosion resistance, and thread fit can be different.
Common Purchasing Descriptions
Buyers may describe black oxide hex bolts with different wording in purchase lists, maintenance bills, or engineering drawings. XZ Fastener can review the description and confirm the correct standard, grade, finish, and inspection route.
For full-thread metric orders, buyers can also compare standard DIN 933 full thread hex bolts in black oxide, zinc plated, yellow zinc, hot dip galvanized, dacromet, or geomet finish.
Detailed Specifications Table
| Specification Item | Available Options and Buyer Notes |
|---|---|
| Product name | Black oxide hex bolts, black oxide hex head bolts, black oxide DIN 933 bolts, black oxide DIN 931 bolts. |
| المعايير | DIN 933, ISO 4017, DIN 931, ISO 4014, ASME hex cap screw patterns, or custom drawing. |
| Size range | Common metric sizes include M3 to M36; larger sizes can be reviewed according to order requirement. |
| نوع الخيط | Metric coarse thread, metric fine thread, UNC, UNF, or specified thread pitch. |
| طول الخيط | Full thread, partial thread, or custom thread length according to standard table or drawing. |
| مادة | Carbon steel, medium carbon steel, alloy steel, or specified steel material for heat-treated bolts. |
| Strength | Grade 4.8, 8.8, 10.9, 12.9, or specified mechanical class according to application requirement. |
| Finish | Black oxide, black oxide with oil, black phosphate, zinc plated, hot dip galvanized, dacromet, geomet, or other finish upon request. |
| Matching parts | Hex nuts, DIN 934 nuts, flat washers, spring washers, lock nuts, or complete bolt-nut-washer sets. |
| Inspection | Dimension check, thread gauge, hardness, tensile test, coating appearance, oiling condition, and packaging verification. |
| Packaging | Bulk cartons, small boxes, plastic bags, anti-rust paper, pallets, labels, barcodes, or private label packing. |
Common Metric Black Oxide Bolt Reference
| Bolt Type | Typical Standard | Common Buyer Use |
|---|---|---|
| Full thread hex bolt | DIN 933 / ISO 4017 | Machinery, brackets, repair kits, equipment frames, and stock programs. |
| Partial thread hex bolt | DIN 931 / ISO 4014 | Assemblies needing an unthreaded shank section and controlled bearing area. |
| High-strength hex bolt | Grade 8.8 / 10.9 / 12.9 | Mechanical assemblies requiring specified tensile and hardness performance. |
| Hex bolt set | Bolt, nut, and washer combination | Distributor kits, maintenance sets, and project packing lists. |
Material and Grade Explanation
Grade 8.8 carbon steel hex bolts are one of the most common choices for black oxide metric fastening. Higher grades such as 10.9 and 12.9 can be supplied when the joint requires greater mechanical performance, but heat treatment, hydrogen embrittlement risk, and finish selection should be considered. Buyers comparing property classes can review XZ Fastener’s guide on how to choose the right bolt grade.
For DIN 933 full thread hex bolts and DIN 931 partial thread bolts, the material and grade should match the nut, washer, and tightening method. A black finish does not replace grade confirmation, so head marking, certificate request, and mechanical inspection should be stated clearly when required.
Surface Finish Selection Guide
Black oxide is usually selected for appearance, low dimensional change, and indoor use with protective oil. Zinc plating provides more general corrosion resistance for many warehouse and light-duty applications. Hot dip galvanizing provides heavier outdoor protection but can influence thread fit because the coating layer is thicker.
For finish comparison, buyers can review the surface finish comparison chart and the guide on zinc plated vs hot dip galvanized bolts. If black oxide is required, specify whether oiling, anti-rust packaging, or a salt spray target is needed.
Manufacturing and Quality Control
Black oxide hex bolts can be produced through wire preparation, cold heading or hot forging, thread rolling, heat treatment, cleaning, black oxide treatment, oiling, and final packing. The exact process depends on diameter, length, strength class, order quantity, and drawing requirements. XZ Fastener can review standard and drawing-based bolts from its broader fastener products range.
Inspection can include raw material verification, head dimension check, shank diameter check, thread go/no-go gauge testing, hardness testing, tensile testing, coating appearance, oil film condition, and packaging review. For thread control, buyers can reference go/no-go thread gauge testing before setting inspection requirements.
Additional process notes are available in XZ Fastener’s technical guides.
تطبيقات
- Machinery frames, equipment housings, brackets, tooling, and fixture assemblies.
- Automotive repair, agricultural equipment, and mechanical maintenance stock.
- Indoor steel structures, storage racks, and industrial installation hardware.
- Distributor inventory where black finish and standard metric sizes are requested.
- Assembly kits with black oxide bolts, nuts, washers, and labeled packaging.
- Projects requiring a dark appearance and controlled thread fit rather than heavy outdoor coating.
How to Get a Faster Quotation
To receive a clearer quotation, send the following information with your inquiry:
- Size list, length, thread pitch, and quantity for each item.
- Required standard, such as DIN 933, ISO 4017, DIN 931, ISO 4014, or ASME inch pattern.
- Material and grade, such as Grade 8.8 carbon steel hex bolts, 10.9, or 12.9.
- Finish requirement, such as black oxide with oil, black phosphate, zinc plated, or hot dip galvanized.
- Matching nuts, washers, lock washers, or complete assembly requirements.
- Packaging method, carton weight limit, labels, barcode, pallet, and private label details.
- Inspection requirements, certificate needs, sample approval, and delivery schedule.
You can request a quote with a spreadsheet, drawing, sample photo, or current purchase specification.
أسئلة متكررة
What is the main purpose of black oxide on hex bolts?
Black oxide provides a dark surface, low coating build-up, and light corrosion protection when combined with oil. It is often selected for indoor machinery, tooling, and equipment assemblies.
Can black oxide DIN 933 bolts be supplied in Grade 8.8?
Yes. Black oxide DIN 933 bolts can be supplied as Grade 8.8 carbon steel hex bolts, with other grades such as 10.9 or 12.9 reviewed according to size and order requirement.
Is black oxide suitable for outdoor use?
Black oxide is generally better for indoor or controlled environments. For outdoor corrosion resistance, buyers often compare zinc plated DIN 933 bolts and hot dip galvanized DIN 933 bolts.
Does black oxide change thread fit?
Black oxide has relatively low coating build-up compared with hot dip galvanizing. Thread fit should still be checked with gauges or sample assembly when the order has strict tolerance requirements.
Can matching black oxide nuts and washers be supplied?
Yes. Matching nuts, flat washers, spring washers, lock washers, and complete bolt-nut-washer sets can be supplied according to order requirement.
What should be specified for anti-rust packaging?
Buyers should state oiling requirement, bag or carton method, anti-rust paper, pallet condition, storage period expectation, and whether export humidity protection is required.
Send Your Black Oxide Hex Bolt Inquiry
For faster pricing, send your size list, finish, quantity, packaging method, and inspection requirements. XZ Fastener can review black oxide hex bolts, DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, metric hex head bolts, matching nuts and washers, and custom packing needs. To discuss project details, contact XZ Fastener.