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NXF USN A36/DIN17100/EN 10025-2/JIS G3101 Diameter 1-100mm Grade 100-450HV Carbon Steel A36 Fasteners Black Oxide Flat Washer
2026-11-05 17:03 NXF GROUP
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Products 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 Black Oxide Flat Washer Introduction
A36 Black Oxide Flat Washer is a common carbon steel fastener washer made of A36 carbon steel with black oxide finish. It features a flat circular shape with a central hole, designed to distribute clamping pressure evenly when tightening bolts and nuts, preventing surface damage of the connected workpiece. The black oxide surface treatment offers basic anti-rust protection, reduces glare, and keeps the original dimensional precision without affecting assembly tolerance. It has stable mechanical performance and good toughness, easy to match with various standard bolts and nuts. This flat washer is widely used in machinery manufacturing, steel structure installation, equipment assembly and general engineering, suitable for dry and indoor working conditions. We supply a full range of standard sizes and accept custom specifications to meet diverse fastening demands.
A36 Black Oxide Flat Washer Drawing
A36 Chemical Composition And Mechanical Properties
Factory and Product Pictures
A36 Black Oxide Flat Washer Product Pictures
A36 PMI spectral testing proves
Video of a customer visiting us
Product processing
A36 Black Oxide Flat Washer Product Processing
1.Raw Material Inspection:
We use A36 carbon steel coil strip as the raw material. Each incoming batch is subject to strict testing, including spectral analysis of chemical composition, tensile and hardness mechanical tests, visual inspection for surface scratches, rust, pits and delamination, and thickness dimension verification of the steel strip. Any unqualified coil will be isolated and returned to the supplier. Only qualified raw materials can be released for production.
2.Stamping & Blanking:
3.Deburring & Degreasing Cleaning:
4.Black Oxide Surface Treatment:
5.Sizing & Flatness Recheck:
6.Final Inspection & Packaging:
2.Stamping & Blanking:
The qualified steel strip is fed into the high-speed stamping press. The precision die punches the flat washer shape in continuous operation, forming the outer circle and inner hole at one time. The process controls the coaxiality of inner and outer diameter, flatness and thickness tolerance. Washer blanks with deformation, burr overflow or dimensional out-of-tolerance are directly sorted out during stamping.
3.Deburring & Degreasing Cleaning:
Stamped washer blanks are loaded into the tumbling barrel with abrasive media for vibratory deburring to remove sharp cutting edges around the inner hole and outer circumference. After tumbling, the washers go through ultrasonic cleaning tank to flush away stamping oil, metal debris and dust. Then clean compressed air is used for full drying to eliminate oil residue and moisture, preventing uneven black oxide coating.
4.Black Oxide Surface Treatment:
The dry washers are processed on the alkaline blackening line sequentially: surface activation, alkaline oxidation reaction, multi-stage rinsing, anti-rust sealing and hot air drying. Under controlled temperature and reaction time, a thin, uniform, adherent matte black oxide film forms on the carbon steel surface. Spot check is carried out to verify coating uniformity, adhesion and anti-rust performance, rejecting parts with mottled color and peeling film.
5.Sizing & Flatness Recheck:
After black oxide treatment, sampling is performed to recheck inner diameter, outer diameter, thickness and flatness. Warped washers and those out of tolerance are screened out. We also inspect the surface for scratches, pits and black film defects.
6.Final Inspection & Packaging:
Full sampling inspection according to the quality standard, covering dimension, surface appearance, black oxide integrity and sealing effect. Qualified washers are packed into moisture-proof plastic bags, then put into export cartons. Each carton is labeled with material grade, specification, batch number, quantity and inspection mark for warehouse storage and shipment.
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.
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
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." Our advantage:3S Service(Small Quantity/Short Time/Special Material)
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:
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:
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.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
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.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
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Phone
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