High Strength Structural Bolts

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MOQ : 100 Kilograms

High Strength Structural Bolts Specification

Head Type
Round

Surface Treatment
Galvanized

Usage
Industrial

Size
M16 - M36

Grade
8.8 or 10.9

Color
Sliver

About High Strength Structural Bolts

High Strength Structural Bolts

High strength structural bolts M16 to M36 or equivalent size in inch series.
Dimensions for bolts conforming to IS 3757, DIN- 6914, ASTM 325 M or ISO 7412. Nut dimensions shall conform to IS - 6623, DIN 6915, ASTM A 563M or ISO 4775. Washer dimensions shall be conforming to IS -6649, DIN-6917, ASTM F -436 or ISO 7415.
Mechanical properties conforming to 8.8 or 10.9 grade as per IS 1367 or ISO 898 or as per respective standard.
Threads conforming to medium class fit or class 6g for bolts and 6H for nuts as per IS - 4218, ISO 261/965.
Products are generally supplied in thermal black finish. Hot dip galvanized finish can be supplied on specific request.

PF High Strength Bolts for Structural Steel Joints with Nuts & Washers to Comply with ASTMA-325M/A490M for Bolts, A563M for Nuts & F436M for Washers Grade 8S/10S.

Table 1 : P.F. ASTM A325M High Strength Structural Bolts Dimensions

Thread Size		M16	M20	(M22)	M24	(M27)	M30	M36
Pitch		2.0	2.50	2.50	3.00	3.00	3.50	4.00
B	Max.	16.70	20.84	22.84	24.84	27.84	30.84	37.00
B	Min.	15.30	19.16	21.16	23.16	26.16	29.16	35.00
da	Max.	18.70	23.24	25.24	27.64	30.40	33.40	39.40
W	Max.	27.00	34.00	36.00	41.00	46.00	50.00	60.00
W	Min.	26.16	33.00	35.00	40.00	45.00	49.00	58.80
C	Min.	29.56	37.29	39.25	45.20	50.85	55.37	66.44
H	Max.	10.75	13.40	14.90	15.90	17.90	19.75	23.55
H	Min.	9.25	11.60	13.10	14.10	16.10	17.65	21.45
R	Min.	0.60	0.80	0.80	1.00	1.20	1.20	1.50
T	T1 Ref.	31	36	38	41	44	49	56
T	T2 Ref.	38	43	45	48	51	56	63

Table 2 : P.F. ASTM A563M High Strength Structural Nuts-Dimensions

Thread Size		M16	M20	(M22)	M24	(M27)	M30	M36
	Pitch	2.0	2.50	2.50	3.00	3.00	3.50	4.00
W	Max.	27.00	34.00	36.00	41.00	46.00	50.00	60.00
W	Min.	26.16	33.00	35.00	40.00	45.00	49.00	58.80
C	Min.	29.56	37.29	39.55	45.20	50.85	55.37	66.44
H	Max.	17.10	20.70	23.60	24.20	27.60	30.70	26.60
H	Min.	16.40	19.40	22.30	22.60	26.30	29.10	35.00
Weight Kg./- 1000 Pcs.		60.4	115.3	142.8	197.7	282.30	365.0	281.8

Table 3 : P.F. ASTM F436M High Strength Structural Washers Dimensions

Bolt Size		M16	M20	(M22)	M24	(M27)	M30	M36
d	Min.	18.00	22.00	24.00	26.00	30.00	33.00	39.00
d	Max.	18.40	22.50	24.50	26.50	30.50	33.60	39.60
D	Max.	34.00	42.00	44.00	50.00	56.00	60.00	72.00
D	Min.	32.40	40.40	42.40	48.40	54.10	58.10	70.10
H	Max.	4.60	4.60	4.60	4.60	4.60	4.60	4.60
H	Min.	3.10	3.10	3.40	3.40	3.40	3.40	3.40
Weight Kg./- 1000 Pcs.		20.3	31.3	33.2	44.7	54.8	61.4	89.7

Table 4 : Mechanical Properties of H.S.S. Bolts

Thread Size	Stress Area	Property Class 8.8			Property Class 10.9
Thread Size	Stress Area	Ultimate Load (Min)	Proof Load (Min)	Hardness	Ultimate Load (Min)	Proof Load (Min)	Hardness
	Mm2	Newtons	Newtons	HRC	Newtons	Newtons	HRC
M16	157	125600	91060	22 - 32	163280	130310	33 - 39
M20	245	203350	147000	23 - 34	254800	203350
M(22)	303	251490	181800		315120	251490
M24	353	292990	211800		367120	262990
(M27)	459	380970	275400		477360	380970
M30	561	465630	336600		583440	465630
M36	817	678110	490200		849680	678110

Table 5 : Mechanical Properties of H.S.S. Nuts

Thread Size	Property Class 8		Property Class 10
Thread Size	Proof Load Newtons	Hardness	Proof Load Newtons	Hardness
M16	168900	HRB 89 to HRC 30	195500	HRC 26 to HRC 36
M20	263400		305000
M(22)	325700		377200
M24	379500		439500
(M27)	493400		571500
M30	603100		698400
M36	878300		1017200

Superior Strength and Reliability

Our structural bolts stand out for their high tensile strength, adhering to Grade 8.8 or 10.9 specifications, ensuring safety and longevity in heavy-duty constructions. These bolts are designed for optimal structural integrity in industrial settings, making them indispensable for builders seeking robust fastening solutions.

Corrosion-Resistant Galvanized Finish

Each bolt is meticulously galvanized, supporting enhanced rust protection and reducing maintenance needs. The galvanized silver finish ensures lasting performance in challenging environments, including marine, construction, and machinery sectors, where exposure to the elements is frequent.

Quality Assurance Across India

As a leading producer and supplier in India, we maintain rigorous quality control from raw material selection to final dispatch. Our bolts meet precise industry standards and are delivered efficiently to industrial buyers, fabricators, and project contractors across the country.

FAQs of High Strength Structural Bolts:

Q: How are high strength structural bolts with Grade 8.8 or 10.9 typically used in industrial settings?

A: High strength structural bolts, particularly Grades 8.8 and 10.9, are used to securely join steel structures, bridges, and heavy machinery. Their increased tensile strength makes them ideal for load-bearing applications where safety and durability are crucial.

Q: What is the process of galvanizing these structural bolts?

A: These bolts undergo a meticulous hot-dip galvanizing process, where they are coated with a protective layer of zinc. This process significantly enhances their resistance to corrosion and prolongs their functional lifespan, especially in outdoor or exposed environments.

Q: When should you choose galvanized bolts with a round head for your project?

A: Galvanized bolts with a round head are preferred when corrosion resistance is essential, and where a smooth, low-profile head is necessary for aesthetic or functional reasons, such as in visible steelwork or machinery where snagging must be minimized.

Q: Where are these high strength bolts commonly supplied and used within India?

A: Our high strength bolts are widely supplied to industrial hubs, construction sites, infrastructure projects, and machinery manufacturers throughout India, including regions with demanding environmental conditions.

Q: What are the key benefits of using Grade 8.8 or 10.9 structural bolts?

A: These grades offer excellent mechanical properties, combining high tensile strength with toughness. This means fewer bolts are needed for the same load, reducing installation time and material costs, while providing superior safety margins.

Q: How does the size range from M16 to M36 accommodate various industrial requirements?

A: The wide size range ensures compatibility with different structural designs and load demands. From lighter assemblies to heavy structural connections, the M16 to M36 options allow engineers to select the ideal bolt size for their specific application.

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