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Jis B 1186 Heavy Hex Nuts

Product: Heavy Hex Nut
Standard: JIS B 1186
Material: SWRCH35K/45K,40CR,42CRMO,etc.
Surface: Plain,zinc plated,black oxide,H.D.G,etc.
Specification Range: M12-M30
Property Class: 8,10,

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Product Introduction

Core Info

Product: Heavy Hex Nut

Standard: JIS B 1186

Material: SWRCH35K/45K,40CR,42CRMO,etc.

Surface: Plain,zinc plated,black oxide,H.D.G,etc.

Specification Range: M12-M30

Property Class: 8,10,

JIS B1186 is a specialized standard in the Japanese Industrial Standards for "High-strength Hexagon Bolts, Hexagon N, and Flat Washers for Friction Clamping Connections", which focuses on the standardization of high-strength fastener connection systems, providing clear basis for the design, and application of related products. The following is an analysis from three aspects:

product-516-403

螺纹尺寸 d		12	16	20	22	24	27	30
P	螺距	1.75	2	2.5	2.5	3	3	3.5
m	公称	12	16	20	22	24	27	30
	最大值	12.35	16.35	20.4	22.4	24.4	27.4	30.4
	最小值	11.65	15.65	19.6	21.6	23.6	26.6	29.6
s	最大值	22	27	32	36	41	46	50
s	最小值	21.2	26.2	31	35	40	45	49
h		0.4~0.8	0.4~0.8	0.4~0.8	0.4~0.8	0.4~0.8	0.4~0.8	0.4~0.8
D	参考值	20	25	30	34	39	44	48
D₁	最小值	20	25	29	33	38	43	47

Core Function and Application

Standardized friction-clamping connection system:

clarify the matching combination requirements of high-strength hex bolts, nuts, and flat washers, and form friction surfaces between connected components through pretension, transmit loads by friction, and avoid relative slip of components.

Ensure high-intensity load-bearing requirements:

For high-strength fasteners of grade 8.8 and above, the core mechanical indicators such tensile strength and yield strength are specified (e.g., the tensile strength of grade 8.8 bolts ≥ 800 MPa), ensuring that connection nodes can withstand larger loads and dynamic stresses, meeting the safety requirements of heavy-load scenarios.

Uniform product technical specifications:

standardize the dimensional parameters of fasteners (such as bolt diameter, nut side width, washer thickness), tolerance, and machining process, providing a unified basis for production, quality inspection, and cross-scene application, and reducing compatibility risks.

Main industry application scenarios

Based on its core characteristics of high strength and high reliability, the fastener products corresponding to JIS B1186 standard are widely used in industry fields strict requirements for connection safety, especially focusing on scenarios that need to withstand heavy load, high pressure or dynamic load, mainly including: Construction industry; Machinery manufacturing industry; Transportation industry; Energy industry.

Core features

a.Strict dimensional tolerance:

Compared with the internationally used ISO standard, the tolerance control for key dimensions is stricter, for example, the tolerance of the width of the side of the hexagon nut is only ±0.10 mm (ISO standard is ±0.17 mm), which needs to be processed high-precision cold forging mold to ensure the adaptability accuracy of the fastener and the stability of the connection.

b.Strong matching:

emphasize the use requirements of bolts, nuts, and flat washers as a set, and clearly stipulate the matching parameters of fasteners different specifications (such as M12-M30) in the standard text to avoid the risk of connection failure caused by the separate selection of components and improve the overall.

c.Adapt to high-intensity scenarios:

Focus on friction-type high-intensity connection needs, covering fasteners of grade 8.8 and above optimizing mechanical performance indicators for high load and dynamic load scenarios, focusing more on the long-term safety and stability of the connection node compared to ordinary fastener standards.

d.Regional applicability clarified:

As a Japanese Industrial Standard, its technical specifications are more tailored to the industrial needs of Japan and East Asia, serving as the core reference for multinational projects and export-oriented manufacturing enterprises in the region, especially for international trade scenarios where compliance with Japanese standards is required.

Established in 2005, our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide