Find Verified Screws Suppliers, Manufacturers and Wholesalers

We mainly produces M6-M120 high-strength bolts,nuts,flat washer, all kinds of special-shaped bolts and low temperature - 50 degree impact test bolts.

We have  more than  20 years of experience.  And we have more than 400 sets of  bolt and nut  producing  and testing equipment.  

Our product standards are  GB, ISO, DIN, BS, ASTM etc.

We can also supply the fasteners for you according your requirements.

We can supply you high quality products with competitive price.

All kinds of screw and nuts per the requirement of customer.

Metal Tile Roof, Terra Tile Roofing, Residential metal roofing
A metal tile roof is a beautiful option for boosting the curb appeal and overall value of your home. KRS Metal Roofs is an experienced roofing company that has been providing world homeowners with exceptional roofing products since 2003.
We produce beautiful Terra Tile roofing that is reminiscent of Old Spanish tile, featuring a metal panel with a deep configuration in the form of an â??S.â?� Due to the exposed fasteners, Terra Tile should only be installed by experienced professionals who understand the intricacies of this roofing style.

Beautiful style, fire resistance, energy efficiency, and a proven performance expectation of 50+ years. Residential metal roofing is one of the fastest growing segments of home improvement â?? more than quadrupling its market share over the past decade. The benefit
s offered by todayâ??s metal roofs allow homeowners to upgrade their homes with products of lasting value.
While other roofs quickly diminish in value as they age, metal roofs provide the following lasting benefits:
Proven performance expectation of 50+ years Beautiful styles to match any home or neighborhood
Interlocking panels for maximum wind resistance awwww
Fire resistance Energy efficiency by keeping homes cooler
Low weight to help preserve structural integrity and life
Consider these unique benefits: Concealed fasteners for beauty and weathertightness Kynar 500 or Hylar 5000 coatings Unique forming methods provide todayâ??s most intricately designed metal roofing profiles
Wide range of colors to meet todayâ??s home design trends
Lifetime / 40-Year Transferable Limited Warranty is non pro-rated for all owners

Corrugated sheeting, corrugated roof sheets
Corrugated Sheeting
Corrugated is the traditional and familiar S-Rib profile for roofing and cladding applications. It is the oldest and most commonly used roofing profile because of its easy handling and fixing properties and related strength. The S-rib is derived from sinus curve and offers very strong and structural properties.
Structural Guidelines
Corrugated roof sheets are available in a wide range of materials displaying various structural properties. It should be noted that the load span characteristics are only to be used as a broad guideline, as purlin spacing is also dependant on other factors such as the prevailing winds in a particular area, snow during winter periods, the presence of dust and other particles in industrial areas, the type of structure that is being erected, etc. We therefore recommend that an engineer be consulted to determine the purlin spacing for a specific application.
Roof pitch
When using Corrugated, the recommended minimum pitch for roof slopes in excess of 15 m is 12.0° and for slopes less than 15 m is 10°. When Corrugated roof s heets are end-lapped the roof pitch should be taken into account. The minimum end laps for roofs pitches in excess of 15° is 150 mm and for other roofs a minimum of 250 mm is recommended. End laps for side sheeting should be at least 100 mm. It is recommended that end and side laps on low pitch roofs be sealed to ensure water tightness

Accessories are an indispensable part of the proper sandwich panel installation. In krs’s offer there is a wide range of different accessories that together make a whole assembling system. Using the krs’s dedicated flashings guarantees a long life of the building.
Our qualified staff will help you to choose the proper flashings.
Installation accessories fulfill several important functions.
Metal flashings are required not only for improvement of final look of the building, but mainly for covering opened core edges as well as joints with windows, doors etc.
Protection against wind, rain or snow is as important as adding a final touch to the esthetics.
We prepared all of the accessories to fit to the panels both technically and optically.
In krs’ offer we have several installation accessories:
Fasteners (screws, fasteners, rivets, load distributors, etc.)
Sealants (adhesive tapes, sealants, gaskets)

Fasteners with a tapered shank (self-tapping screws)
chipboard screw & particle board screw
Similar to a drywall screw except that it has a thinner shank and provides better resistance to pull-out in particle board, while offset against a lower shear strength. The threads on particle board screws are asymmetrical.

concrete screw& Tapcons & masonry screw & confast screw & blue screw & self-tapping screw & Titen
A stainless or carbon steel screw for fastening wood, metal, or other materials into concrete or masonry. Concrete screws are commonly blue in color, with or without corrosion coating. They may either have a Phillips flat head or a slotted hex washer head. Heads sizes range from 0.1875 to 0.375 in (4.763 to 9.525 mm) and lengths from 1.25 to 5 in (32 to 127 mm). Typically an installer uses a hammer drill to make a pilot hole for each concrete screw.

deck screw
Similar to drywall screw except that it has improved corrosion resistance and is generally supplied in a larger gauge. Most deck screws have a type-17 (auger type) thread cutting tip for installation into decking materials. They have bugle heads that allows the screw to depress the wood surface without breaking it.

double ended screw & dowel screw & hanger bolt
Similar to a wood screw but with two pointed ends and no head, used for making hidden joints between two pieces of wood.
A hanger bolt has wood screw threads on one end and machine threads on the other. A hanger bolt is used when it is necessary to fasten a metal part to a wood surface.

drive screw & hammer drive screw
Chiefly used for attaching manufacturers data plates to equipment. Smooth round or mushroom headed with a multi-start thread on the shank, beneath which is reduced diameter shank that acts as a pilot. The screw is fastened by hitting the head with a hammer and is not intended for removal

drywall screw

Specialized screw with a bugle head that is designed to attach drywall to wood or metal studs, however it is a versatile construction fastener with many uses. The diameter of drywall screw threads is larger than the grip diameter.

eye screw & screw eye & vine eye

Screw with a looped head. Larger ones are sometimes called lag eye screws. Designed to be used as attachment point, particularly for something that is hung from it. A vine eye (in the UK at least) is similar to a screw eye, except that it has a proportionally longer shank and smaller looped head. As the term suggests vine eyes are often used for attaching wire lines across the surface of buildings so that climbing plants can attach themselves.

Krs splendid plank – a perfect fibre cement plank for modern architecture
Krs splendid plank is a unique composite of natural fibres bonded tightly in a high-grade silicate structure. This autoclaved, wood-grain and smooth siding plank acquires impressive toughness, yet remains flexible and dimensionally stable. It is cellulose cement plank that contains absolutely no asbestos fibre.
Benefits of krs splendid plank

Krs fibre cement planks
weather resistant
immune to water damage 
 fire resistant 
 not brittle 
 low shrinkage 
 bendable 
 high workability 
 termite resistant 
 non-asbestos

Krs splendid plank achieves the beautiful aesthetic grooves on the building walls with the edged profile of splendid siding. Krs splendid plank is another version of lap siding with stand up the most demanding design. With krs splendid plank, ship-lapping installation is very simple and efficient. There are several designs of edge profiling available that not only provide innovative styles in for example home designs but also long lasting and less worry from humidity, heat, salt spray and flying debris. Primed planks can be coated before or after installation (double coating) with optional acrylic paint.
Standard references

Specifications: 45/90, 45/100,50/105, 51/105, 55/110, 58/124, 60/125, 65/120, 65/132, 68/143, 70/140, 75/150, 80/143, 92/188

The compression ratio of the screw can be designed according to different products and mixtures.

Nitrided Hardness: HV 900-1000
Nitrided Case Depth: 0.45mm-0.7mm
Alloy hardness: HRC50-65
Alloy depth: 0.8mm-2.0mm
Materials: Quality 38CrMoAlA
Advanced nitriding process
Corrosion&Abrasion resistance bimetal spraying process

Parallel twin-screw and barrel used in extruder
Specifications
PX-45/2~150/2
Lenght/Diameter Ratio:L/D=18~25
The compression ratio of the screw can be designed according to different raw materials and products.
Hardness hardness:HV800-1000
Nitrided Case Depth:0.45mm~0.7mm
Alloy Hardness:HRC 50-65
Alloy Depth:0.8mm~2.0mm

Rubber pined screw and barrel specification: 75mm~+200mm
Rubber cold or hot-feed screw and barrel specification: 30mm~+250 mm
Nitrided Hardness: HV900-1000
Nitrided case depth: 0.45mm-0.7mm
Alloy hardness: HRC50-65
Alloy Depth: 0.8mm-2.0mm
Materials: Quality 38CrMoAlA
Advanced nitriding process
Corrosion&Abrasion resistance bimetal spraying process

This company produces the SJZS series cone-shape double screw rodplastic extruding machine, has forces to squeeze out, high grade, thecompatibility broad, the life long, the shear rate small, the materialis not easy to decompose, to mix builds up the plasticizing to be good, the powder material directly takes shape and so on the characteristic, provides the direct current velocity modulation, the temperature automatic control, installment and so on vacuum exhaust. Is suitable to product the and so on tube, board, different shapematerial production.

250~3200KN Mould Clamping Force, 30-25000g Shot Weight
Diameter of screw: ¬ª20~¬+200
Screw can be mated with different heads, and barrel can be mated with different nozzles.
Nitrided Hardness: HV900-1000
Nitrided case depth: 0.45mm-0.7mm
Alloy hardness: HRC50-65
Alloy Depth: 0.8mm-2.0mm
Materials: Quality 38CrMoAlA
Advanced nitriding process
Corrosion&Abrasion resistance bimetal spraying process

The bimetallic barrel for single screw is a kind of barrel moulding 2-3mm thick alloy coat on the barrel inner wall which has excellent corrosion resistance, abrasion resistance and high working temperature. And its useful service life is greatly improved contrast to the common nitrided cylinder. Bimetal has more obvious advantages when processing special plastics to enhance the abrasion life, such as engineering plastic, fluorine plastics, PPO and etc.

The company product's single/twin screw, uses special alloy powders being sprayed and welded on the screw's ridge, and uses different alloys and welding methods for the screw of different functions.

Materials:
Quality 38CrMoAlA
Quality power metallurgy raw materials

Barrel & screw for extruder
Specifications: 15mm -0mm
Length/Diameter Ratio: L/D=15-45

Screws can be selected from ordinary, gradual, mutational, pinned, shielding, separating and exhausting types. The compression ratio of screw can be designed according to different raw materials and requirements of clients.