High Strength 4.8 8.8 12.9 Hex Bolt High Strength Hex Bolt and Nuts Fasteners Factory Custom ASME DIN Supplier

• Customization: Available
• Material: Carbon Steel, Stainless Steel, Alloy Steel
• Type: Hexagon Head
• Model NO.: DIN931
• Connection: Common Bolt
• Head Style: Hexagonal
• Standard: DIN, ANSI, GB, JIS, BSW, GOST
• Grade: 4.8/8.8/10.9/12.9
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Black/Yzp/Bzp/HDG/Dacromet/Plain
• Delivery: 5-10 Days in Stock, 10-30 Days Not in Stock
• Head Mark: Customized
• Thread Length: Full Thread/Half Thread
• Size: M3-M100
• Customized: Yes
• Transport Package: Plastic Bags+Cartons+Pallets
• Specification: as Request
• Trademark: LS or Customized
• Origin: Hebei, China
• HS Code: 731815
• Production Capacity: 50 Million Tons/Month
• Package Size: 24.40cm * 12.00cm * 12.00cm
• Package Gross Weight: 30.000kg

Product Description

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.

PRODUCT PARAMETER

SEMI-THREADED

DIN 931 specifies partially threaded hexagon head bolts, engineered for robust fastening. Key features:

Thread Design: Partial threading (unthreaded shank absorbs shear forces, threaded section clamps components).
Materials: Carbon steel (8.8/10.9 grade), stainless steel (304/316), or alloy steel (for high-stress scenarios).
Specs: Sizes M6–M52 (DIN 931-1: M1.6–M39; DIN 931-2: M42–M160), tensile strength ≥500 N/mm², compatible with DIN 934 nuts.

Applications:

1.Construction/Infrastructure: Fasten steel beams, bridges, and heavy machinery (shank resists shear loads).

2.Automotive/Machinery: Secure engine parts, chassis, and suspensions (handles vibration and high stress).

3.Marine/Chemical: Stainless/alloy versions thrive in corrosive environments (seawater, chemicals).
4.Manufacturing: Assemble industrial equipment, conveyor systems, and structural frames.

DIN931

Thread Spec		(M68)	M72	(M76)	M80	M90	M100	M110	M125
d
P	thread pitch	6	6	6	6	6	6	6	6
b	125<L≤200	148	156	164	172	192	-	-	-
	L<200	161	169	177	185	205	225	245	275
c	Min	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4
	Max	1	1	1	2	2	2	2	2
da	Max	75	79	83	87	97	107	117	132
ds	Max=Nominal	68	72	76	88	90	100	110	125
	Min	67.26	71.26	75.26	79.26	89.13	99.13	109.13	124
dw	Min	92.9	97.7	102.1	106.9	121.1	135.4	144.9	168.6
e	Min	110.51	116.16	121.81	127.46	144.08	161.02	172.32	200.57
k	Nominal	43	45	48	50	57	63	69	79
	Min	42.5	44.5	47.5	49.5	56.4	62.4	68.4	78.4
	Max	43.5	45.5	48.5	50.5	57.6	63.6	69.6	79.6
k1	Min	29.8	31.2	33.2	34.6	40.3	43.7	47.9	54.9
r	Min	2	2	2	2	2.5	2.5	2.5	2.5
s	Max=Nominal	100	105	110	115	130	145	155	180
	Min	97.8	102.8	107.8	112.8	127.5	142.5	152.5	177.5

STANDARD HEAD SHAPE 

Threads Are Deep And Strong

FLAT AND SMOOTH TAIL

Bolts are made from high quality
materials and standard processes
the head is standard and not deformed

The threads are smooth and flat, and the
construction is sturdy. Uniform force when
using, more solid after tightening

Smooth tail for greater ease of use
and improved work efficiency