ASME B18.2.1 HEX BOLTS MANUFACTURER IN CHINA

Ningbo Teng Qi Fasteners Co., Ltd is a leading ASME B 18.2.1 hex bolts manufacturer in China. ASME B18.2.1 is a standard that specifies the dimensions, mechanical properties, and other relevant requirements for hexagon head bolts with unified thread pitch and thread lengths that are shorter than those of standard hex bolts. These shorter hex bolts are commonly used in applications where a shorter bolt length is needed.

The standard covers bolts made from various materials, including carbon steel, alloy steel, and stainless steel. ASME B18.2.1 hex bolts are used in a variety of applications, much like other hex bolts, but they are chosen specifically when the bolt’s length needs to be shorter while still maintaining the hexagon head and threaded design.

In summary, ASME B18.2.1 hex bolts offer standardized specifications for shorter hex bolts with unified thread pitch, ensuring interchangeability and reliability in various industries and applications.

ASME B 18.2.1 Grade 8 Half Thread Hot Dip Galvanized Hex Bolts

Specification:

Product name	ASME B 18.2.1 HEX BOLT
Diameter	1/4"-4"
Length	Up to 30"
Thread	UNC/UNF
Head Type	Hex Head
Grade	SAEJ429 GR.2/5/8 A307 A193 B7
Material	carbon steel, stainless steel (304 or 316), alloy steel, brass, and more
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

Chemical Composition:

Grade	Carbon, %	Phosphorus, %	Manganese, %	Sulfur, %
2	0.47 max	0.120 max	-	0.15 max
5	0.55 max	0.050 max	0.30 min	0.15 max
8	0.55 max	0.040 max	0.30 min	0.05 max

Mechanical properties:

GRADE	Nominal Size, inches	Full Size Proofload, psi	Yield Strength, min, psi	Tensile Strength, min, psi	Elong, min, %	RA, min, %	Core Hardness, Rockwell	Tempering Temperature, min
1	1/4 thru 1-1/2	33,000	36,000	60,000	18	35	B7 to B100	N/A
2	1/4 thru 3/4	55000	57000	74000	18	35	B80-B100	N/A
2	Over 3/4 thru 1-1/2	33,000	36,000	60,000	18	35	B70 to B100	N/A
5	1/4 thru 1	85,000	92,000	120,000	14	35	C25 to C34	800F
5	Over 1 thru 1-1/2	74,000	81,000	105,000	14	35	C19 to C30	800F
8	1/4 thru 1-1/2	120,000	130,000	150,000	12	35	C33 to C39	800F
Grade 2 requirements for sizes 1/4" thru 3/4" apply only to bolts 6" and shorter, and to studs of all lengths. For bolts longer than 6", Grade 1 requirements shall apply.

Manufacturing Quality Control of ASME B18.2.1 Hex Bolts:

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.