NXF UNS A36 S235JR/St37-2/SS400/SM400A/A283C Diameter M33 Length 100mm Carbon Steel Hexagon Bolts

2026-07-24 16:29 NXF GROUP

Product Description

A36 Introduction

ASTM A36 is the most commonly used mild and hot-rolled steel. It has excellent welding properties and is suitable for grinding, punching, tapping, drilling and machining processes. Yield strength of ASTM A36 is less than that of cold roll C1018, thus enabling ASTM A36 to bend more readily than C1018. Normally, larger diameters in ASTM A36 are not produced since C1018 hot roll rounds are used.

A36 Carbon Steel Hexagon Bolts Introduction

Carbon steel hexagonal bolts are general standard fasteners complying with DIN931, DIN933, GB/T5782 and other domestic and international standards. They are processed from low-carbon and medium-carbon steel, including grade 4.8 ordinary types and heat-treated high-strength types of 8.8, 10.9 and 12.9 grades, suitable for assembly scenarios with light and heavy loads. The standard hexagonal head can be tightened conveniently with spanners or sleeves from all angles. Rolled threads feature precise and uniform texture for tight engagement to prevent slipping and loosening, available in full-thread and half-thread designs. Metric sizes from M3 to M64 and imperial sizes are covered, with customizable lengths.Surface treatments such as black oxide, electro-galvanizing, hot-dip galvanizing and phosphating are optional to isolate moisture and enhance corrosion resistance for indoor machinery, outdoor steel structures and engineering machinery. Grade 4.8 low-carbon bolts have good ductility for light furniture and general equipment assembly, while quenched & tempered high-strength bolts deliver stable tensile load capacity without brittle fracture, widely used in factory steel frames, heavy machinery and bridge construction. Cost-effective and highly versatile, they can be supplied as sets with matching nuts, flat washers and spring washers. All finished bolts undergo full inspections on hardness, tensile strength and appearance with precise dimensional tolerances, meeting mass fastening demands in machinery manufacturing, construction projects and pipe supports.

A36 Carbon Steel Hexagon Bolts Drawing

A36 Chemical Composition and Mechanical Properties

Factory and Product Pictures

A36 Carbon Steel Hexagon Bolts Product Pictures

A36 PMI spectral testing proves

Video of a customer visiting us

Product processing

A36 Carbon Steel Hexagon Bolts Product Processing

1.Raw Material PretreatmentQualified low-carbon or medium-carbon steel wire rods are adopted. Processes including pickling, phosphating and saponification are carried out to remove surface scale and rust, improve the lubricity of raw materials, prevent scratches and cracks during processing, and provide high-quality base materials for subsequent cold heading forming.

2.Cold Heading FormingHigh-precision cold heading machines cut the wire rod, upset the head and shape the workpiece, forming the hexagonal head and shank of bolts in one step. The cold heading process maintains continuous metal fiber and higher material density, improving the overall strength and toughness of bolts, with standard hexagonal dimensions and neat appearance guaranteed.

3.Precision Thread RollingFormed blanks go through thread rolling. Special thread rolling dies extrude and roll to form standard threads. The threads feature uniform, full profiles with high precision and tight engagement, effectively preventing thread slipping and loosening. They match precise assembly with all types of nuts and meet universal thread tolerance standards of GB, DIN and other specifications.

4.Heat Treatment Strengthening (For High-strength Types)High-strength bolts of Grade 8.8 and above adopt quenching and tempering heat treatment to eliminate processing stress, enhance tensile strength and hardness, and avoid fracture or deformation under heavy loads. Ordinary Grade 4.8 bolts require no heat treatment and maintain excellent ductility.

5.Surface Treatment & InspectionAnti-corrosion treatments such as black oxide finishing, electro-galvanizing and hot-dip galvanizing are available as required. Final procedures include dimension verification, hardness testing, tensile test and visual sorting to reject defective products. Qualified bolts are packed and warehoused to ensure stable and compliant quality.

Our NXF GROUP Advantage As Follow:

1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you
with a one-stop service.

Packing & Delivery

Company Profile

New XiFei (SuZhou) Business Co.,Ltd is one of the leading and most respected manufacturers in China. Our products include metals,machinery, containers, construction materials, mechanical products, electrical systems, and medical accessories. Established in1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management and Craftsmanship."

A36 Carbon Steel Hexagon Bolts Certification

FAQ

1. who are we?
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern
Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central
America(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.what can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products

4. why should you buy from us not from other suppliers?
Our advantage:3S Service (Small Quantity/Short Time/Special Material) We have our own factories, quality can be controlled
seriously. We Specialize in manufacturing about 21 years. We have professional testing department and testing equipment.

5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;

Accepted Payment Type: T/T,L/C,D/P D/A;

Language Spoken:English,Chinese