Phone/Whatsapp:+8613917160311
Email: info@nxf-group.com
Email: Andrew@nxf-group.com
Email: Alice@nxf-group.com
NXF UNS A36 S235JR/St37-2/SS400/SM400A/A283C Diameter M33 Length 100mm Carbon Steel Partial Thread Hexagon Bolts
A36 Carbon Steel Partial Thread Hexagon Bolts Introduction
A36 Carbon Steel Partial Thread Hexagon Bolts Product Processing
1.Wire Rod PretreatmentPremium medium carbon steel wire rods are processed through pickling, phosphating and saponification successively to completely remove scale and rust on the steel surface. A lubricating protective film forms on the raw material to prevent scratches and cracks during cold heading, ensuring intact appearance and stable dimensions of finished bolts.
2.Cold Heading FormingHigh-precision multi-station cold heading machines cut wire rods to fixed lengths and integrally forge standard hexagonal heads and half-thread smooth shanks. The cold heading process fully retains the metal flow lines of steel to improve the overall tensile and shear resistance of bolts. Hex heads feature neat outlines free of burrs and chipping.
3.Precision Thread RollingThread rolling extrusion is conducted on bolt blanks to roll precise threads compliant with DIN931 and GB/T5782 standards. Threads have full and uniform profiles that fit nuts tightly to avoid thread slipping and loosening. Thread tolerances are strictly controlled for matching assembly with standard fasteners.
4.Quenching & Tempering Heat TreatmentAll formed bolts undergo quenching followed by high-temperature tempering to eliminate internal processing stress, stably boosting hardness and comprehensive mechanical strength to meet Grade 8.8 / 10.9 / 12.9 high-strength standards, resisting deformation and fracture under heavy loads.
5.Black Oxide Treatment & Finished Product InspectionHigh-temperature black oxide treatment creates a black anti-rust oxide layer on the surface to enhance wear resistance and basic anti-corrosion performance. Batch inspections including dimension measurement, hardness test, tensile test and full visual screening are carried out to eliminate defective products. Qualified bolts are sorted, packed and warehoused to guarantee consistent factory 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.
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