Flange Bolts High Tensile Class 8.8 Hot DIP Galvanised Hex Flange Purlin Bolts Nuts M10 M12 M16

Product Description

PRODUCT PARAMETER

Flange Bolt

Flange bolts feature a hexagonal head integrated with a circular flange at the base, eliminating the need for separate washers. This design increases the contact area, distributes clamping force evenly, and enhances anti-loosening performance in vibration-prone environments. Common materials include carbon steel (8.8/10.9 grade, zinc-plated), stainless steel (304/316 for corrosion resistance), and alloy steel. Standards like ISO 4161, DIN 6921, and ASME B18.2.1 specify sizes from M5 to M30, with flange diameters 1.5–2 times the bolt diameter for optimal load distribution. The flange may include serrations or teeth to prevent rotation during tightening.

Applications:

Automotive Industry: Secure chassis components, engine mounts, and suspension parts (withstands road vibration and dynamic loads).
Industrial Machinery: Fasten gearboxes, pumps, or conveyor systems where space is limited and anti-loosening is critical.
Construction/Infrastructure: Install steel brackets, solar panel frames, or outdoor fixtures (stainless variants resist weathering).
Marine/Chemical Plants: Join pipes, flanges, or equipment in corrosive environments (corrosion-resistant materials prevent degradation).
Electronics/Devices: Fix casings or panels in compact devices (flange reduces surface damage from over-tightening).

Flange Bolt

Thread size					M5	M6	M8	M10	M12
d
P		thread pitch	coarse thread		0.8	1	1.25	1.5	1.75
			Fine teeth 1		/	/	1	1.25	1.5
			Fine teeth 2		/	/	/	1	1.25
b		L≤125			16	18	22	26	30
		125<L≤200			/	/	28	32	36
		L>200			/	/	/	/	/
c		Min			1	1.1	1.2	1.5	1.8
da		A	Max		5.7	6.8	9.2	11.2	13.7
		B	Max		6.2	7.4	10	12.6	15.2
dc		Max			11.8	14.2	18	22.3	26.6
ds		Max			5	6	8	10	12
		Min			4.82	5.82	7.78	9.78	11.73
du		Max			5.5	6.6	9	11	13.5
dw		Min			9.8	12.2	15.8	19.6	23.8
e		Min			8.71	10.95	14.26	16.5	17.62
f		Max			1.4	2	2	2	3
k		Max			5.4	6.6	8.1	9.2	11.5
k1		Min			2	2.5	3.2	3.6	4.6

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).