medium carbon steel bolts wholesale supplier for Grade 8.8 and Industrial Fastening
XZ Fastener supplies medium carbon steel bolts in wholesale quantities for machinery, equipment frames, automotive brackets, construction hardware, agricultural machines, and general industrial assemblies. Products can be supplied as hex bolts, flange bolts, carriage bolts, structural bolts, shoulder bolts, and made-to-drawing bolts according to order requirement. Buyers can specify standard, thread, length, property class, heat treatment, surface finish, packaging, inspection level, batch labels, and replenishment schedule. Medium carbon steel bolts can also be packed with nuts, washers, anchors, spacers, and related fastener products for distributor, OEM, construction, and maintenance purchasing.
Quick Specs
What Buyers Should Know Before Sourcing Medium Carbon Steel Bolts
Medium carbon steel bolts are commonly selected when buyers need higher strength than mild steel fasteners and better heat-treatment response. Before placing a wholesale order, confirm the bolt standard, head style, thread type, length, property class, material grade, surface finish, packing method, and whether proof load or hardness checks are required. For Grade 8.8 and 10.9 bolts, material selection and heat treatment should be reviewed together.
For standard hex bolt purchasing, buyers often compare DIN 933 full thread hex bolts and Grade 8.8 carbon steel hex bolts. For non-standard head dimensions, special thread length, private labels, or drawing-based parts, XZ Fastener can review custom fasteners according to order requirement.
Common Purchasing Descriptions
- Wholesale medium carbon steel hex bolts, Grade 8.8, full thread, zinc plated, carton packing.
- DIN 933 full thread hex bolts in 45# steel, black oxide finish, metric coarse thread.
- Grade 8.8 carbon steel hex bolts with nuts and hardened washers, packed by size and part number.
- Metric hex head bolts, medium carbon steel, blue white zinc plated, test report available upon request.
- Zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts for machinery and construction orders.
- Custom medium carbon steel bolts according to drawing, heat treatment, finish, packaging, and inspection requirements.
Detailed Specifications Table
| Предмет | Typical Options | Buyer Notes |
|---|---|---|
| Тип продукта | Hex bolt, flange bolt, carriage bolt, structural bolt, shoulder bolt, U bolt, custom bolt | Confirm head style, thread length, shank length, and assembly clearance before ordering. |
| Стандарты | DIN 933, DIN 931, DIN 6921, ISO 4014, ISO 4017, ANSI B18, ASTM, JIS, GB | Provide standard number, diameter, length, thread pitch, and property class. |
| Thread | Metric coarse, metric fine, UNC, UNF, full thread, partial thread, custom thread | Thread fit should be confirmed with matching nuts, tapped holes, or inserts. |
| Материал | 35#, 45#, 35K, 45K, 1035, 1045, 40Cr, equivalent medium carbon steel | Material should be selected together with property class, heat treatment, and coating. |
| Strength | 5.8, 6.8, 8.8, 10.9 or project-specific mechanical requirement | Grade 8.8 and above normally require controlled heat treatment and mechanical checks. |
| Heat Treatment | Quenched and tempered, normalized, stress relieved, or according to drawing | Specify tensile, proof load, hardness, or other mechanical requirements if needed. |
| Обработка поверхности | Plain oiled, black oxide, zinc plated, color zinc, phosphate, hot dip galvanized, Geomet type coating | Finish should be selected according to corrosion exposure, assembly friction, and storage time. |
| Manufacturing Method | Cold heading, hot forging for large sizes, thread rolling, machining, heat treatment, coating, sorting | Large diameter or special bolts may need a different production route from standard cold heading. |
| Wholesale Packing | Bulk carton, small box, inner bag, part-number label, barcode label, pallet packing | Mixed size orders should be separated clearly by size, grade, finish, and part number. |
| Inspection | Dimension check, thread gauge, hardness check, tensile or proof load test, coating check, visual sorting | Inspection reports can be prepared according to order requirement. |
For wholesale buyers comparing grade, load, and working conditions, XZ Fastener’s fastener selection guide can help clarify application details before quotation.
Material and Grade Explanation
Medium carbon steel contains more carbon than mild steel and can reach higher mechanical properties after proper heat treatment. 35#, 45#, 1035, 1045, 35K, 45K, and equivalent grades are commonly considered for industrial bolts. 40Cr and similar alloy steel may be reviewed when higher performance or larger sizes require better hardenability.
For Grade 8.8 bolts, buyers should confirm whether the order requires tensile testing, proof load testing, hardness testing, or material traceability. Material choice should also consider thread rolling behavior, coating process, application load, and whether bolts will be used with matching nuts and washers. Drawing-based items can follow XZ Fastener’s guide on made-to-drawing fastener material requirements.
Surface Finish Selection Guide
- Plain oiled: Common for indoor storage, short-term protection, and buyer-controlled finishing.
- Black oxide: Often used for machinery, tools, and indoor equipment where a dark surface is required.
- Zinc plated: A common choice for general corrosion resistance and clean appearance.
- Color zinc: Used when yellow chromate appearance or purchasing description is required.
- Phosphate and oil: Suitable for selected mechanical assemblies requiring a darker, oil-retaining surface.
- Hot dip galvanized: Used for outdoor structures, construction hardware, and heavier corrosion exposure.
- Geomet type coatings: Available upon request for selected corrosion resistance and hydrogen embrittlement control needs.
Manufacturing and Quality Control
Medium carbon steel bolt production can include wire rod selection, spheroidizing or annealing when needed, cold heading, hot forging for larger sizes, thread rolling, heat treatment, surface finishing, sorting, and wholesale packing. Important control points include head dimensions, thread pitch, thread fit, shank length, straightness, heat-treatment uniformity, hardness, proof load, coating thickness, and visual appearance.
XZ Fastener checks incoming material, production dimensions, thread gauges, heat-treatment results, surface finish, packing labels, carton quantity, and pallet details according to the purchase order. Buyers who need repeatable bulk supply can refer to XZ Fastener’s fastener quality control notes when preparing inspection requirements.
Приложения
Machinery Assembly
Used for equipment frames, guards, mounting plates, gearboxes, supports, and general industrial bolted joints.
Automotive and Trailer Hardware
Suitable for brackets, frames, service parts, and non-critical to medium-duty fastening positions according to design needs.
Construction Hardware
Used for steel brackets, base plates, clamps, anchors, and support frames where higher strength is required.
Agricultural Equipment
Common in machinery exposed to vibration, maintenance cycles, and outdoor working conditions.
Industrial Maintenance
Metric hex head bolts and flange bolts can be packed by size for MRO stock and repair kits.
Distributor Stock
Bolts can be packed with nuts, flat washers, spring washers, barcode labels, and part-number bags for wholesale replenishment.
How to Get a Faster Quotation
For standard medium carbon steel bolts, send the standard number, bolt type, diameter, length, thread pitch, full or partial thread requirement, property class, material grade, finish, quantity, packaging method, carton label details, and inspection requirement. For custom bolts, include a drawing, sample photo, head dimensions, shank length, thread length, tolerance, heat treatment, surface finish, and assembly purpose.
For wholesale orders, list matching nuts, washers, packaging labels, carton weight limits, pallet requirements, and inspection documents. Buyers can contact XZ Fastener with drawings and order details for review.
Часто задаваемые вопросы
Can XZ Fastener supply medium carbon steel bolts in wholesale quantities?
Yes. Medium carbon steel bolts can be supplied in wholesale quantities according to DIN 933, DIN 931, DIN 6921, ISO 4014, ISO 4017, ANSI, ASTM, JIS, GB, or buyer drawings. Please provide size, length, thread, grade, finish, quantity, and packing requirement.
Which material grades are commonly used for medium carbon steel bolts?
Common options include 35#, 45#, 35K, 45K, 1035, 1045, 40Cr, and equivalent grades. The final selection should consider bolt size, property class, heat treatment, coating, and application load.
Can medium carbon steel bolts be supplied as Grade 8.8?
Yes. Grade 8.8 carbon steel hex bolts can be supplied when material, heat treatment, and mechanical requirements are properly defined. Buyers may request hardness, tensile, or proof load checks according to order requirement.
Can bolts be packed by size, barcode, or part number?
Yes. Medium carbon steel bolts can be packed in bulk cartons, inner bags, small boxes, kit bags, or palletized cartons. Labels by size, barcode, part number, quantity, and order reference can be arranged according to order requirement.
Can medium carbon steel bolts be packed with nuts and washers?
Yes. Bolts can be packed with matching nuts, flat washers, spring washers, hardened washers, anchors, and other hardware. Please provide the full assembly list, finish, quantity, and packaging method.
What information is needed for a made-to-drawing bolt quotation?
Please send a drawing or sample photo, material grade, diameter, length, thread pitch, thread length, head dimensions, property class, heat treatment, finish, quantity, packaging, and inspection requirements.
Send Your Medium Carbon Steel Bolt Wholesale Inquiry
For a faster quotation, send your size list, standard number, material grade, property class, finish, quantity, packaging method, and inspection requirements. If available, include drawings, samples, assembly photos, mating nut and washer details, labels, or part numbers so XZ Fastener can check the production route and wholesale packing plan.
Запросить цитату
English 
Español 
Tiếng Việt 
Русский 
العربية