BSCI Certification Stainless Steel Roofing Screws From China

• Material: Stainless Steel
• Type: Round Head
• Groove: Torx Socket
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: UNF-10
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, GB, ANSI, BSW, JIS, GOST
• Grade: 8.8
• Surface Treatment: Zinc Plated, Ruspert, Dacromet, Customized
• Delivery: Sea Freight, Air, Train, Express
• Certification: ISO9001, BSCI
• Sample: Yes
• ODM/OEM: Accept
• Transport Package: Carton Boxes + Pallets
• Specification: M2.5~M20
• Trademark: UN
• Origin: China
• HS Code: 7318159090
• Production Capacity: 700tons/Month
• Package Size: 30.00cm * 20.00cm * 10.00cm
• Package Gross Weight: 1.000kg

Product Description

Our Advantages

 

Product Description

Union Stainless Steel Spengler Screws

Name

Spengler Screws

Material

Stainless Steel

Size

M2.5~M20 or non-standard as request&design

Length

6-100mm or non-standard as request&design

Surface Treatment

Electrical Zinc Coating. Ruspert, Dacroment,etc,Customized

Quality

Sample Testing Or Third-party Inspection

Origin

Made in China

Lead Time

Based on quantity

Stainless Steel Chemical Composition
Grade	C  ≤	Si  ≤	Mn  ≤	P  ≤	S  ≤	Ni	Cr	Mo	Other
201	0.15	1.00	5.5-7.5	0.060	0.03	3.5-5.5	16-18		N≤0.25
304	0.08	1.00	2.00	0.045	0.03	8.0-10.0	18-20
304L	0.03	1.00	2.00	0.045	0.03	8.0-12.0	18-20
321	0.08	1.00	2.00	0.045	0.03	8.0-13.0	17-19		Ti≤5*C%
316	0.08	1.00	2.00	0.045	0.03	10.0-14.0	16-18	2-3
316L	0.03	1.00	2.00	0.045	0.03	10.0-15.0	16-18	2-3
309S	0.08	1.00	2.00	0.045	0.03	12.0-15.0	22-24
410	0.15		1.00		0.03	-	11.5-13.5
420	0.26-0.4		1.00		0.03	-	12-14
430	0.12	0.75	1.00	0.040	0.03	-	16-18

 

Main Fastener Coating
Types	Application	Spray Test Hours	Characteristics
Zinc, Electroplated	All Metal	96Hours	Lower cost and bright surface
Hot Dip Galvanized	All Metal	96Hours	Low corrosion rate and resists mechanical damage.
Electro Nickel	All Metal	200Hours	Flexibility in plating volume and thickness
Mechanical Plating	Steel	1000Hours	Smooth finish with high anti-corrosion grade
Black Oxide	All Metal	3-5Hours	Cheap
Dacrotized	Steel	1000Hours	Pollution-free ceramic coating
Passivation	Stainless Steel	/	Dissolved iron contaminants
Wax	Stainless Steel & Plated Fasteners	Fair, used as a lubricate	Used for ease of assembly

 

Stainless Steel Screws

provide unmatched benefits over standard steel screws thanks to their superior durability, high strength, and excellent corrosion resistance. This makes stainless steel an ideal screw material for applications demanding weather and rust resistance as well as longevity under stress.

Stainless steel screws come in a wide selection of head styles and drive types to accommodate various assembly and fastening needs.
Stainless steel screws are also available with different thread configurations for different purposes. 
In addition to drive type and threads, stainless steel screws come in a number of head styles to suit various needs. 
Stainless steel screws can also receive a number of different coatings to augment their corrosion resistance with additional properties. 

The most common grades of stainless steel used for screws include 304 and 316. 304 stainless offers a good balance of decent corrosion resistance paired with adequate tensile strength for many applications. 316 stainless contains more nickel for enhanced resistance to chlorides and marine environments. When very high strength is needed, 410 stainless can be heat treated and hardened to achieve impressive tensile strength levels rivaling some alloy steel grades.

With their unparalleled combination of corrosion resistance, high strength, and longevity, stainless steel screws clearly outperform regular steel, brass, or coated screws. Their excellent physical properties ensure durable, reliable fastening performance even when subjected to demanding outdoor conditions. Any application where weather resistance, rust prevention, and longevity are important benefits will stand to gain by utilizing superior stainless steel screws.

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