Metal thin black flat washer

Specifications

Introduction

Flat washer is one of  part of the fastener , it is used for different fittings together with spring washer , bolt and screws , flat washer can increase the touching area of bolts or screws .

Materials for washers

Specification

1. ISO

2. DIN

3. ANSI

4. GB

5. JIS

6. BSW

Finish for washers

Different fittings different finishs request , suitable finishs can make screws keep nice surface and anti-rust .

1) Zinc .

this is the most popular treatment , the usual color cover black , silver , yellow and white . more colors see below color card .

2) Nickel .

this is more good finish than zinc and is sole color , many parts are plated also in this finish .

3) Oxidization .

this finish is used for part stainless steel pieces , and the most alumiunm parts .

4) Polish .

the parts will be more bright after polished , especially for stainless steel parts .

5) Paint .

the color of paint is more abundant , it is more paint in different colors .

6) bronze .

this finish is very few used just for some special pieces .

Quality control

(1) Checking material before feed in

all material must be checked according to the requirements of products before put them onto the machines to ensure material is available .

(2) IPQC ( by handle and auto-machined control )

The semi-finished products must be checked in special tools during production , this ensure products are always under control .

(3) Chemical elements analysis and fhysical testing after post treatment

The most metal products need post treatment after finished proudct, all products will be tested after than to make sure the quality of products are meet the related requirement .

(4) The second inspection , sort all finished goods by sorting machines if required ;

All goods were finished , they must to be tested and checked before package ; In this phase , goods will be checked in full inspection or partial inspection . and checking methods can be by handle or auto-machines .

(5) Packing

Packed in polybags and cartons or in small color bags .

(6) Last inspection ( spot checking , packages status , quantity etc )

When all goods are ready , we will make a final inspection for quantity and package’s status .

(7) Delivery

Everything is ready , we will deliver goods to appointed place or port according talking

Material introduction

1. Exceptional Anti-rust performace . stainless steel material is good resistance from rust ,generally , finished goods can be anti-rusted over 72 hours under 96% salty sprey . so the most goods in outdoor or on seaside are choosed stainless steel as the first material .

As stainless steel contains nickel and chrome elementes , it is one of the best material that on resistance rust , especially for working surroundings with much acidity .

2. Nice surface . goods are polished after finished forming . this is a good choice for ornamental parts . besides , stainless steel parts also can be finished in different colors per surface of fittings . In fact , stainless part itself has bright appearance .

3. Strong Strength . As stainless steel has more "C" element , especially martensite stainless .

4. Antibiosis . Most medical equipments are made from stainless steel as it can be up to 99% on killing bacteria .

5. Outstanding weldability . The part under normal temperature is showing austenite status , and keep the perfect comprehensive performance .

6. High hardness . Parts are made from alloy elements material .it is up to HRC58 or more high .

7. Resistance to abrasion . High hardness ensures parts can resist abrasion during operation .

8. Enviromental protection . Picked material and finish treatment are based on ROHS or GB standard .

Packing

1. In bulk

Items are packed in apparent polybags and solid cartons then , usually 3-5 bags in each carton and the gross weight is about 15 kilograms .

The sizes of the carton

20x28x16

16x18x25

20x22x28

16x18x28

Application

This package is usually for private use in the factory to assemble parts

Advantage

1) suitable for production line in the factory

2) big quanity each bag

3) low cost on package

2. Box

Items are packed in boxes inside and some boxes to a carton , the boxes would be colored or plain . 10-15 kilograms each carton . it contains plastic box and chipboard box . and both kinds of boxes can be print the customer’s logo .

Application

Box package is usually for sales in store .

Advantages

1) Individual packing

2) Customization design

3) Easy to sales

4) easy to check

5) easy to carry

6) not easy broken

7) beautiful apperance.

FAQ’s

Q. How about your capacity ?

A. With scale of ten thousand square meters , different processing machines , we are able to finish up to 2000 tons raw material every year , generally , one full 20 feet container ( about 20 tons) can be done in 20- 25 days .

Q.How long I can get samples for approval before placing order ?

A. Let you get and confirm samples in first time is our reponsiblity and pleasure , just in one week for new samples that need to be done in new tools , and we can deliver samples within 24 hours for exsiting samples once received your request .

Q.What are your popular payement menthods ?

A. T/T is our prior choose for all , of course , we are also accept L/C , Westunion , paypall .