Cold heading Service

AS1252 Structural Hex Bolts Manufacturers, Suppliers and Factory in China

Ningbo Teng Qi Fasteners Co., Ltd is a leading AS1252 hex bolts manufacturer in China. AS1252 Hex Bolts is an Australian/New Zealand standard that specifies requirements for high-strength steel bolts, nuts, and washers for use in structural engineering and other applications. These bolts are commonly used in heavy-duty construction, industrial equipment, and other situations where strong and reliable connections are essential.

AS1252 high strength hex bolts manufacturer

Specification of AS1252 Bolts:

Product name	AS1252 HEX BOLT
Diameter	M12-M64
Length	30mm-500mm
Thread	Coarse
Head Type	Large Hex Head
Class	8.8
Manufacturing Process	wire drawing, cold heading/hot forging, thread rolling, heat treatment, surface treatment
Surface treatment	Black Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating
Application Industry	Construction/Machinery/Automotive/Infrastructure/Electrical and Electronics/Furniture/Marine and Offshore

Mechanical property:

Mechanical or physical property
Tensile strength, Rm, MPa	nom.	800	800
Tensile strength, Rm, MPa	min.	800	830
Stress at 0,2 % nonproportional elongation, R p0,2, MPa	nom.	640	640
Stress at 0,2 % nonproportional elongation, R p0,2, MPa	min.	640	660
Percentage elongation after fracture for machined test pieces, A, %	min.	12	12
Percentage reduction of area after fracture for machined test pieces, Z, %	min.	52
Vickers hardness, HV F W 98 N	min.	250	255
Vickers hardness, HV F W 98 N	max.	320	335
Rockwell hardness, HRC	min.	22	23
Rockwell hardness, HRC	max.	32	34

The materials and mechanical properties of high-strength steel bolts shall be as given in AS/NZs 4291.1 for property class 8.8.

Surface treatment AS1252 Bolts:

Surface finish Unless otherwise specified, high-strength steel bolts shall be supplied, hot-dip galvanized in accordance with AS 1214. Uncoated bolts shall be in the dull black as heat-treated condition.

Chemical Composition for AS1252 Bolts:

Property class	Material and heat treatment	Chemical composition limits (cast analysis, %) a					Tempering temperature
		C		P	S	B	°C
8.8	Carbon steel with additives (e.g. Boron or Mn	0.15	0.4	0.025	0.025	0.003	425
	Carbon steel quenched and tempered	0.25	0.55	0.025	0.025
	Carbon steel quenched and tempered	0.20	0.55	0.025	0.025

Dimension of AS1252 Bolts:

The dimensions given in Table apply before hot-dip galvanizing.

Bolt dia.	Pitch	Body dia.	Width AF	Width AC	Head height
D	P	Ds	s	e	k
		max.	min.	max.	min.
M12	1.75	12.7	11.3	21	20.16
M16	2	16.7	15.3	27	26.16
M20	2.5	20.84	19.16	32	31
M24	3	24.84	23.16	41	40
M30	3.5	30.84	29.16	50	49
M36	4	37	35	60	58.8

Quality Control of AS1252 hex bolts:

In a world where connections matter, Ningbo Teng Qi Fasteners is more than just a hex bolts supplier and manufacturer. We are architects of stability, builders of relationships, and champions of your success. From skyscrapers that reach for the sky to machines that power industries, our hex bolts form the backbone of progress. When you choose Ningbo Teng Qi Fasteners, you choose unwavering quality, exceptional service, and a partner who understands that every bolt holds a piece of your vision.

Control Method	Detail
Material Inspection:	Verify the material's composition, heat treatment, and quality upon receipt. Conduct metallurgical analysis to ensure the material properties meet the standards.
Process Control:	Implement strict process control measures for heat treatment, machining, threading, and any other manufacturing steps. Maintain consistent process parameters to ensure uniform quality.
Inspection Points:	Introduce inspection points at various stages of manufacturing to check for defects, dimensions, and quality. Inspect threading, dimensions, surface finish, and other critical parameters.
Sampling and Testing:	Regularly sample products for testing, such as tensile testing, hardness testing, and metallurgical analysis, to ensure they meet the required specifications.
Thread Inspection:	Thoroughly inspect threading using proper thread gauges to ensure accurate dimensions and fit with mating components.
Traceability:	Implement a traceability system to track each fasteners journey from raw material to final product. This aids in accountability and recalls if necessary.