Stainless Steel Hexagon Head Bolt with Nuts and Washers

Product introduction

A hexagonal bolt is a metal fastener with a hexagonal head that facilitates high-torque installation with a wrench. It can be used with a nut or screwed directly into a threaded hole. As one of the most widely used connectors, its hexagonal head has a large stress area, the wrench clamping is stable, and the tightening force is balanced and not easy to slip-2. Thread specifications cover M4 to M100, with lengths up to 500mm. According to performance, they are divided into ordinary bolts (grade 4.8, Q235) and high-strength bolts (grade 8.8, 10.9, 12.9). In high-strength application scenarios, customized non-standard fasteners are a common choice - the head size, shaft length, and thread profile of the bolt can be adjusted as needed to meet the precision connection requirements of special working conditions. When standard specifications cannot be met, we provide customized special-shaped fastener services, integrating flanges, steps or special-shaped heads on the basis of regular external hexagons.

 

This external hexagonal bolt includes standard off-the-shelf and non-standard fasteners, and can be customized to develop customized non-standard fasteners, customized special shape fasteners, stainless steel hexagonal bolt fasteners, and automotive parts fasteners. The product adopts cold heading one-piece molding process. The hexagonal head is evenly stressed and the threads are precise and smooth. The head size, rod length, step structure and thread specifications can be adjusted according to drawings and samples, breaking through the limitations of conventional standard parts. Carbon steel, alloy steel, 304/316 stainless steel and other materials are available to meet anti-corrosion and high-strength assembly requirements. It is widely used as fasteners for automobile parts and also serves the fields of engineering machinery, new energy equipment, and automation equipment. The manufacturer supports sample proofing and mass production, and provides one-stop solutions for various customized non-standard fasteners and customized special-shaped fasteners to meet the non-standard assembly needs of global buyers.

 

Materials and application fields

Carbon steel (grade 4.8/8.8/10.9/12.9), high strength, cost controllable, mechanical assembly, steel structure, bridge

Stainless steel hexagonal bolt fasteners (304/316), corrosion-resistant, wear-resistant, can be used in food production, chemical equipment, medical equipment, and outdoor facilities

Alloy steel (40Cr/42CrMo/35CrMoA), fatigue resistance, impact resistance, engineering machinery, wind power equipment

 

Core application scenarios (extensive use of automotive parts fasteners):

Automotive industry: The connection of key parts such as chassis, engine, gearbox, etc. often requires high-strength bolts of grade 10.9 or grade 12.9

Buildings and steel structures: Main component connections generally use high-strength bolt connections, which are divided into friction type and pressure-bearing designs.

Mechanical equipment: fixation of machine tools, pumps, valves, compressors and other equipment parts

Pipes and fluid systems: flange connections and pipe bracket fixings

 

Quality control and certification system

For non-standard fasteners and customized non-standard fasteners, we have established a special inspection process:

Full inspection of geometric dimensions: hexagonal head to edge distance, total bolt length, thread tolerance (6g/4h, etc.) are inspected by image screening machine

Mechanical property testing:

Guaranteed load test (to verify whether the strength level meets the standard)

Breaking torque test (verify whether the hexagonal head slips or cracks)

Hardness gradient detection (to verify heat treatment quality)

Material and surface: spectral component analysis + salt spray test (up to more than 200 hours depending on coating requirements)

 

Certification system:

ISO 9001:2015

IATF 16949 (applicable to bulk supply of automotive parts fasteners)

Comply with GB/T, DIN, ISO, ANSI, JIS and other standard system requirements

Customized services (focus on non-standard customization)

We focus on the R&D and mass production of customized non-standard fasteners. We can provide the following customization directions for external hexagonal bolts:

Non-standard sizes and specifications: increase or decrease the hexagonal head to edge distance, customize the total length of the bolt (beyond the standard length range)

Non-standard materials and grades: customized ultra-high-strength bolts and high-temperature-resistant bolts above grade 12.9 according to working conditions.

Customized special shape fasteners: flange hexagonal bolts, step hexagonal bolts, special-shaped head bolts, etc.

Non-standard surface treatment: Dacromet, zinc-nickel alloy, hot-dip galvanizing, electrophoresis, Teflon coating, etc.

Customers provide 2D/3D drawings, samples or assembly descriptions. We provide full-process services from cold heading mold development, heat treatment process design, sample trial production to mass production.

 

FAQ

Q: How to distinguish between ordinary bolts and high-strength bolts with external hexagonal bolts?

A: Ordinary bolts are generally grade 4.8 or 5.6, and the material is mostly Q235. They only need to be tightened and can be reused. High-strength bolts are generally grade 8.8, 10.9 and above, made of 45# steel, 40Cr or 20MnTiB. They need to undergo quenching and tempering heat treatment. They are mostly used for permanent connections and cannot be reused.

 

Q: Under what circumstances do you need to customize non-standard external hexagonal bolts?

A: When standard specifications (such as GB/T 5782, DIN 931) cannot meet the size, strength or functional requirements, non-standard fasteners need to be customized. For example, non-standard length, thickened or thinned head, special-shaped rod, etc.

 

Q: Are stainless steel hexagonal bolts suitable for automobile manufacturing?

A: Yes, stainless steel hexagonal bolt fasteners are used in automobile exhaust systems, decorative parts and parts with high corrosion resistance requirements. However, it is recommended to use alloy steel high-strength bolts (grade 10.9/12.9) in high-strength load-bearing parts such as chassis.

 

Q: Can this bolt be customized for automotive parts assembly?

A: Absolutely. The automotive industry is one of the main application areas for external hexagonal bolts. The automotive parts fastener products we provide can meet the IATF 16949 quality system requirements.

 

Q: What is the minimum order quantity? Can I make a sample?

A: The minimum quantity for the sample stage is 200-500 pieces for assembly verification; the minimum quantity for batch order is 5,000 pieces or more. For customized non-standard fasteners, since special mold opening is required, the minimum order quantity can be negotiated based on the mold cost.

 

Q: What surface treatments are available for external hexagonal bolts?

A: Common ones include blackening, galvanizing, hot-dip galvanizing, Dacromet, electrophoresis, phosphating, etc. Dacromet coating has excellent anti-corrosion properties and is suitable for outdoor and salt spray environments.

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