DIN Standard 12-Point Flange Head Bolts M4 Steel Aluminium Carbon Steel Zinc Plated Hot Dipped Galvanized for Motorcycle Gr5

Product Description

PRODUCT PARAMETER

12-Point bolt

12-Point Flange Bolts: Applications & Overview
12-point flange bolts combine a 12-sided head with an integrated flange, enabling high torque transmission via compact wrenches while eliminating the need for washers. The flange distributes clamping force evenly, resisting loosening in vibration-prone settings. Made of high-strength steel (8.8/10.9/12.9 grade, with zinc/Dacromet coatings for corrosion resistance), they adhere to standards like DIN 6921 or ISO 16650, with sizes M6–M30.

Key applications:

Automotive Engines/Transmissions: Secure critical components (e.g., cylinder heads) needing high preload and space efficiency.
Heavy Machinery: Fasten gearboxes, hydraulic systems in construction/agricultural equipment (withstands dynamic loads).
Aerospace/Industrial Tools: Fit compact assemblies (e.g., aircraft engine parts) requiring robust, low-profile fasteners.
High-Vibration Environments: Perform in pumps, generators where anti-loosening and torque reliability are critical.

			1/4	1/3	3/8	4/9	1/2	5/9	5/8
PP	UNC		20	18	16	14	13	12	11
ds	Min		0.2435	0.3053	0.3678	0.4294	0.4919	0.5538	0.6163
dc	Max		0.375	0.469	0.562	0.656	0.75	0.844	0.938
	Min		0.365	0.457	0.55	0.642	0.735	0.828	0.921
s	Max		0.252	0.315	0.377	0.438	0.502	0.564	0.627
	Min		0.244	0.306	0.368	0.429	0.493	0.555	0.618
dk	Min		0.278	0.348	0.42	0.489	0.562	0.633	0.705
k	Max		0.26	0.312	0.375	0.438	0.5	0.563	0.625
c	Min		0.058	0.074	0.095	0.109	0.129	0.145	0.166
b			1	1.125	1.25	1.375	1.5	1.625	1.75
kw	Min		0.15	0.18	0.21	0.26	0.29	0.33	0.36

3/4	7/8	1
10	9	8
0.7406	0.8647	0.9886
1.125	1.312	1.5
1.107	1.293	1.479
0.752	0.877	1.003
0.743	0.866	0.991
0.847	0.987	1.13
0.75	0.875	1
0.2	0.234	0.268
2	2.25	2.5
0.44	0.51	0.6

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).