High-Strength Self-Drilling Screws - Grade 10.9 Bimetal SDS, Stainless Steel 316 DIN 7504 for Heavy Machinery/Roofing, Anti-Corrosion

• Customization: Available
• Material: Carbon Steel/Stainless Steel/Alloy Steel
• Shape of Head: Hex Cap/Hex Flange/Countersunk/Flat/Phillips/Truss
• Model NO.: screw
• Surface Finishing: Black/Zinc,Yzp,Bzp,HDG,Plain
• Certification: ISO, RoHS
• Customized: Customized
• Delivery: 5-10 Days in Stock, 10-30 Days Not in Stock
• Head Type: Pan, Truss, Flat, Round, Hex, Cheese, Binding, Csk
• Thread: Fine Thread, Coarse Thread
• Size: Customized
• Standard: DIN 7504/DIN En ISO15480/81/82/83/Uni 8117/JIS B 1
• Size Unit: Inch Size/ Metric Size
• Other Name: Self-Tapping Screw/Tek Screw
• Supplier Status: Factory Manufacturer Wholesaler
• Transport Package: Plastic Bags+Cartons+Pallets, or Customlized
• Specification: as Request
• Trademark: LS or Customized
• Origin: Hebei, China
• HS Code: 731814
• Production Capacity: 50 Million Tons/Month
• Package Size: 24.40cm * 12.00cm * 6.00cm
• Package Gross Weight: 30.000kg

Product Description

PRODUCT PARAMETER

SELF-DRILING TAPPING SCREWS 

Self-drilling screws are equipped with integrated drill tips that can directly penetrate materials such as steel, aluminum or wood without the need for pre-drilling. The drill tip (usually in the shape of a chisel or pointed tip) is used for drilling, and the thread moves upward to form a strong fastener. Self-drilling screws are made of carbon steel (galvanized) or stainless steel (304/316), with a diameter range of 3.5 to 6.3 millimeters and a maximum length of 150 millimeters. They have models such as Type C (for steel), Type F (for wood) and Type CF (for wood mixing).
 
Applicable to:
 
Construction: Fixed steel roofs, wall panels or lightweight frames.
 
Manufacturing industry: Assembling metal enclosures, trailers or HVAC pipes.
 
Automobile: Connects body panels or chassis components.
 
Outdoor: Secure sheds, ship parts or fences in corrosive environments. DIY:
 
Quickly install in fences, drainage ditches or home projects.

 

Self-Drilling Screw

Thread Spec			ST2.9	ST3.5	ST4.2	ST4.8	ST5.5	ST6.3	ST5.5
P	thread pitch		1.1	1.3	1.4	1.6	1.8	1.8	1.8
a	Max		1.1	1.3	1.4	1.6	1.8	1.8	11.5
dk	Max		5.5	7.3	8.4	9.3	10.3	11.3	10.3
	Min		5.2	6.9	8	8.9	9.9	10.9	9.9
k	Max		1.7	2.35	2.6	2.8	3	3.15	3
r	Max		1.2	1.4	1.6	2	2.2	2.4	2.2
SlotNo			1	2	2	2	3	3	5
M1			3.2	4.4	4.6	5.2	6.6	6.8	3.6
M2			3.2	4.3	4.6	5.1	6.5	6.8	4.3
dp			2.3	2.8	3.6	4.1	4.8	5.8	25
Drilling range (plate thickness)			0.7~1.9	0.7~2.25	1.75~3	1.75~4.4	1.75~5.25	2~6	4.5

ABOUT US

LONGSHI FASTENERS MANUFACTURING CO.,LTD.,

Longshi Fastener Manufacturing Co., Ltd., founded in 2008, is located in Shahe City, Hebei Province, close to the country's largestLarge fastener industrial cluster - Yongnian standard parts Industrial Park. The company headquarters covers an area of 21 thousand square meters, the annual output value of 200 million yuan, with more than 200 employees, with domestic More than 100 sets of advanced production equipment. It is a "manufacturing + service" type enterprise integrating fastener production, intelligent warehousing and e-commerce sales. The company's construction of the sea screw e-commerce park is located in Yongnian District, Handan City, Hebei Province, covers an area of 45 acres, the park planning and construction of office area, production area, packaging area, storage area, etc., to provide fastener production, packaging, warehousing, e-commerce sales and other services. Longshi mainly produces high quality and high strength fasteners, and "Longshi" screws have become a well-known brand in the industry. Longshi always adhere to quality first, reputation first. From raw material procurement, design and development, production and processing to products strict quality control is implemented in every link of quality testing and sales to win the recognition of our customers. The company has established standardized product testing laboratories and quality testing processes and standards to ensure that products strictly comply with national standards.

FAQ

Q1: What is your minimum order quantity (MOQ)? Do you charge extra for small orders?
100 pieces MOQ (most peers require 1,000+), no price premium for small orders. First-time customers for cross-border e-commerce/trade get free samples.
Q2:Do you support custom orders? How long does the customization process take?
Longshi Advantage: 8-dimensional customization (material, specification, surface treatment, etc.), with 3D design drawings + process plans.
Q3: What if an item is out of stock?
Stockout rate <0.1% (peers: 10+%), with real-time inventory monitoring. For extreme stockouts, free upgraded alternatives are provided (peers often leave clients waiting indefinitely).
Q4: Do you provide technical support, such as installation guidance or drawing optimization?
Dedicated 1v1 engineer team offering free technical support.
Q5:Can I visit your factory or arrange a factory audit?
Support online factory tours (real-time video of production lines/laboratories) and offline visits (pick-up service available).