Bolt Specifications

Bolt & Rod Specifications

At TUHU Fasteners, we provide a comprehensive range of bolt specifications for industrial and structural applications. All bolts are manufactured to meet international standards, including ASTM, SAE, ISO, and DIN. Our bolt specifications cover a variety of thread types (metric and imperial), mechanical grades, material options, and protective coatings. Click the button below to explore our full range of bolt products.

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A307

F1554

A354

A325

A193

A449

J429

ISO

Bolt Thread Type: M/ UNC/ UNF

Diameter (mm)	Pitch (mm)	Diameter (mm)	Pitch (mm)
M6	1	M24	3
M8	1.25	M24	2
M8	1	M27	3
M10	1.5	M27	2
	1.25	M30	3.5
	1	M30	2
M12	1.75	M33	3.5
	1.25	M33	2
	1.5	M36	4
M14	2	M36	3
M14	1.5	M42	4.5
M16	2	M42	3
M16	1.5	M45	4.5
M18	2.5	M48	5
	2	M48	3
	1.5	M52	5
M20	2.5	M56	5.5
	2	M56	4
	1.5
M22	2.5
	2
	1.5

Diameter (Inch)	Pitch (Threads Per Inch)	Diameter (Inch)	Pitch (Threads Per Inch)
1/4”	20UNC	7/8”	9UNC
1/4”	28UNF	7/8”	14UNF
5/16”	18UNC	1”	8UNC
5/16”	24UNF	1”	12UNF
3/8”	16UNC	1-1/8”	7UNC
3/8”	24UNF	1-1/8”	8UNF
7/16”	14UNC	1-1/4”	7UNC
7/16”	20UNF	1-1/4”	8UNF
1/2”	13UNC	1-3/8”	6UNC
1/2”	20UNF	1-3/8”	8UNF
9/16”	12UNC	1-1/2”	6UNC
9/16”	18UNF	1-1/2”	8UNF
5/8”	11UNC	1-3/4”	5UNC
5/8”	18UNF	1-3/4”	8UNF
3/4”	10UNC
3/4”	16UNF

Bolt Dimension Standard

Bolt types	Bolt Standard	The grade of recomment nut	The grade of recommend washer
Hex bolt, hex cap screw, carriage bolt, hex flange bolt, square bolt, plow bolt, U bolts, splice bolt, T bolt, socket cap screw, timber bolt, etc.	SAE J429 Gr.2	SAE J995 Gr.2	N/A
	SAE J429 Gr.5	SAE J995 Gr.5	N/A
	SAE J429 Gr.8	SAE J995 Gr.8	N/A
	ASTM A307 Gr.A	ASTM A563 Gr.A	N/A
	ASTM A307 Gr.B	ASTM A563 Gr.A	N/A
Thread rods and headed bolt	ASTM A193 B7	ASTM A194 Gr.2H	F436
	ASTM A193 B8 class1	A194 Gr. 8	SS304
	ASTM A193 B8M class1	A194 Gr. 8M	SS316
	ASTM A193 B8 class 2	A194 Gr. 8	SS304
	ASTM A193 B8M class 2	A194 Gr. 8M	SS316
Steel transmission tower bolt	ASTM A394 Type 0	ASTM A563 Gr.A	F436
	ASTM A394 Type 1	ASTM A563 Gr.DH	F436
	ASTM A394 Type 3	ASTM A563 Gr.DH3	F436
Anchor bolt	ASTM F1554 Grade 36	ASTM A563 Gr.A	F436
	ASTM F1554 Grade 55	ASTM A563 Gr.A	F436
	ASTM F1554 Grade 105	ASTM A563 Gr.DH	F436
Heavy hex structural bolts	ASTM A325	ASTM A563 Gr.DH	F436
Heavy hex structural bolts	ASTM A490	ASTM A563 Gr.DH	F436

A307 & A394 Grade Specification

Standard for Bolt	Grade	Tensile Strength	Yield Strength	Elongation	Length	Hardness
		ksi	ksi	%, min	in.	Brinell	Rockwell B
A307	A	60min	-	18	＜3*D	121-241HRB	69-100HRB
	A	60min	-	18	≥3*D	241max	100max
	B	60-100	-	18	＜3*D	121-212	69-95
	B	60-100	-	18	≥3*D	212max	95max
A394	Type 0	74					80-100
A394	Type 1	120					25-34

A307 Chemical Requirements

Element	Grade A	Grade B
Carbon, max	0.29%	0.29%
Manganese, max	1.20%	1.20%
Phosphorus, max	0.04%	0.04%
Sulfur, max	0.15%	0.05%

A307 Recommended Hardware

Nuts			Washers
A307 Grades A		A307 Grade B
1/4 - 1-1/2	1-5/8 - 4	1/4 - 4	Unspecified
A563A Hex	A563A Heavy Hex	A563A Heavy Hex	Unspecified

F1554 Grade Descriptions

Grade	Description
F1554 Grade 36	Low carbon steel, minimum 36 ksi yield strength; suitable for general-purpose anchoring
F1554 Grade 55	Medium-strength, low-alloy steel with 55 ksi yield; often used in structural applications
F1554 Grade 105	Heat-treated alloy steel, high strength with 105 ksi yield; ideal for critical load-bearing anchors

F1554 Grade Specification

Grade	Size Range	Tensile Strength	Yield Strength	Yield Strength	Elongation	Reduction of Area
	Inches	ksi	ksi,min	MPa,min	% min	% min
36	½ – 4	58 – 80	36	248	23	40
55	½ – 2	75 – 95	55	380	21	30
	2¼ – 2½	75 – 95	55	380	21	30
	2¾ – 3	75 – 95	55	380	21	30
	3¼ – 4	75 – 95	55	380	21	30
105	½ – 3	125 – 150	105	724	15	45

F1554 Chemical Requirements

Element	Grade 36			Grades 55 and 105
	Grade 36 - Sizes up to 3/4	Grade 36 - Sizes over 3/4 to 1-1/2	Grade 36 - Sizes over 1-1/2 to 4
Carbon (max)	0.26%	0.27%	0.28%
Manganese	*	0.60 - 0.90%	0.60 - 0.90%
Phosphorus, max	0.04%	0.04%	0.04%	0.040%
Sulfur, max	0.05%	0.05%	0.05%	0.050%
Copper, min (when specified)	0.20%	0.20%	0.20%	0.20%

F1554 Recommended Hardware

Grade	Size Inches	Recommended A563 Nut				Washer
		Plain Finish - Grade		HDG Coated		Plain/ HDG
		Grade	Style	Grade	Style
36	½ – 1½	A	Hex	A	Hex	F436
36	1⅝ – 4	A	Heavy Hex	A	Heavy Hex
55	½ – 1½	A	Hex	A	Heavy Hex
55	1⅝ – 4	A	Heavy Hex	A	Heavy Hex
105	½ – 1½	2H	Heavy Hex	2H	Heavy Hex
105	1⅝ – 3	DH	Heavy Hex	DH	Heavy Hex

A325 Grade Specification

Standard for Bolt	Grade	Bolt Size	Tensile Strength	Yield Strength	Elongation	Bolt Length	Reduction of Area	Hardness
		in.	ksi	ksi	%, min	in.	%, min	Brinell	Rockwell C
A325	Type 1	1/2 - 1	120min	92min	14min	＜2*D	35	253-319	25-34HRC
		1/2 - 1	120min	92min	14min	≥ 2*D	35	319max	34max
		1-1/8 - 1-1/2	105min	81min	14min	＜3*D	35	223-286	19-30HRC
		1-1/8 - 1-1/2	105min	81min	14min	≥ 3*D	35	286max	30max

A325 Type 1 Chemical Requirements

Heat Analysis	120ksi	150ksi
	%	%
Carbon	0.30 – 0.52	0.30 – 0.48*
Manganese	0.60 min	0.60 min
Phosphorus	0.035 max	0.035 max
Sulfur	0.040 max	0.040 max
Silicon	0.15 – 0.30	-
Boron	0.003 max	0.003 max
Copper	-	-
Nickel	-	-
Chromium	-	-
Molybdenum	-	-
*Carbon 0.35-0.53% for 1-1/2” A490/150ksi bolts

A325 Recommended Hardware

Nuts		Washers
Type 1		Type 1
Plain	Galvanized	Type 1
A563C, C3, D, DH, DH3	A563DH	F436

SAE J429 Grade Specification

Standard for Bolt	Grade	Bolt Size	Tensile Strength	Yield Strength	Elongation	Full Size Proofload	Reduction of Area	Hardness
		in.	ksi	ksi	%, min	psi.	%, min	Surface 30N max	Core Rockwell
SAE J429	2	1/4 to 3/4	74	57	18	55,000	35	/	B80 to B100
	2	Over 3/4 to 1‑1/2	60	36	18	33,000	35	/	B70 to B100
	5	1/4 to 1	120	92	14	85,000	35	54	C25 to C34
	5	Over 1 to 1‑1/2	105	81	14	74,000	35	50	C19 to C30
	8	1/4 to 1‑1/2	150	130	12	120,000	35	58.6	C33 to C39

J429 Chemical Requirements

Grade	Material	Carbon	Phosphorus	Sulfur
		%	%	%
2	Low or Medium Carbon Steel	0.15 - 0.55	0.030 max	0.050 max
5	Medium Carbon Steel	0.28 - 0.55	0.030 max	0.050 max
8	Medium Carbon Alloy Steel	0.28 - 0.55	0.030 max	0.050 max

J429 Recommended Hardware

Nuts	Washers
J995	Unspecified

A354 & A490 Grade Specification

Standard for Bolt	Grade	Bolt Size	Tensile Strength	Yield Strength	Elongation	Reduction of Area	Hardness
		in.	ksi	ksi	%, min	%, min	Brinell	Rockwell C
A354	BC	1/4~2-1/2	125min	109min	16	50	255-331	26-36
	BC	>2-1/2	115min	99min	16	45	235-311	22-33
	BD	1/4~2-1/2	150min	130min	14	40	311-363	31-38
	BD	>2-1/2	140min	115min	14	40	293-363	31-38
A490	Type1	1/2~1"	150-173	130min	14		<2D, HB 311-352；>2D, HB…-352;	<2D, 33-39；>2D, HC…-39;
A490	Type1	1~1-1/2"	150-173	130min	14		<3D, HB313-352；>3D,HB…-352	<2D, 33-39；>2D, HC…-39;
In 2016, ASTM officially withdrew specifications A325 and A490, replacing them with ASTM F3125. Under the new F3125 specification, A325 and A490 heavy hex structural bolts are classified as grades. Summaries of the now-obsolete A325 and A490 specifications are retained on our site solely for reference.

A354 Chemical Requirements

Element	All sizes of Grade BC, Grade BD through 2-1/4” diameter.	Grade BD over 2-1/4”
Carbon, %	0.30 to 0.53	0.35 to 0.53
Manganese, % min	0.6	0.6
Phosphorus, % max	0.035	0.035
Sulfur, % max	0.04	0.04
Boron, % max	0.003	0.003
Nickel, % min		0.4
Chromium, % min		0.4
Molybdenum, % min		0.15
Other Alloying Elements	*	*

A354 Recommended Hardware

Grade	Finish	Nut	Washer
BC	Plain	A563C Heavy Hex	F436
BC	Galvanized	A563DH Heavy Hex	F436
BD	All Finished	A563DH Heavy Hex	F436

A449 Grade Specification

Standard for Bolt	Grade	Bolt Size	Tensile Strength	Yield Strength	Elongation	Reduction of Area	Hardness
		in.	ksi	ksi	%, min	%, min	Brinell	Rockwell C
A449	Type1	1/4 to 1	120min	92min	14	35	255-321	25-34
		over 1 to 1-1/2	105min	81min	14	35	223-285	19-30
		over 1-1/2 to 3	90min	58min	14	35	183-235	/

A449 Chemical Requirements

Element	Carbon Steel	Carbon Boron Steel	Alloy Steel	Alloy Boron Steel
Carbon	0.30 - 0.52%	0.30 - 0.52%	0.30 - 0.52%	0.30 - 0.52%
Manganese, min	0.60%	0.60%	0.60%	0.60%
Phosphorus, max	0.04%	0.04%	0.04%	0.04%
Sulfur, max	0.05%	0.05%	0.04%	0.04%
Silicon	0.15-0.30%	0.10 - 0.30%	0.15 - 0.35%	0.15 - 0.35%
Boron		0.0005 - 0.003%		0.0005 - 0.003%
Alloying Elements			*	*

A449 Recommended Hardware

Nuts			Washers
Plain	Galvanized	Galvanized	F436
1/4 - 1-1/2	1-5/8 - 3	1/4 - 3
A563B Hex	A563A Heavy Hex	A563DH Heavy Hex

A193 Grade Specification

Standard for Bolt	Grade	Bolt Size	Tensile Strength	Yield Strength	Elongation	Reduction of Area	Hardness
		in.	ksi	ksi	%, min	%, min	Brinell	Rockwell
A193	B7	Up to 2-1/2	125min	105min	16	50	321	C35
		over 2-1/2 to 4	115min	95min	16	50
		over 4 to 7	100min	75min	18	50
	B7M	Up to 4	100min	80min	18	50	235	B99
	B7M	over 4 to 7	100min	75min	18	50	235	B99
	Class 1: B8, B8M	all	75min	30min	30	50	223	B96
	Class 2: B8M	Up to 3/4	110min	96min	15	45	321	C35
		over 3/4 to 1	120min	80min	20	45	321	C35
		over 1 to 1-1/4	110min	95min	25	45	321	C35
		over 1-1/4 to 1-1/2	100min	85min	30	45	321	C35

A193 Chemical Requirements

Element	B7 (AISI 4140)	B8 (AISI 304)	B8M (AISI 316)
Carbon	0.38 - 0.48%	0.08% max	0.08% max
Manganese	0.75 - 1.00%	2.00% max	2.00% max
Phosphorus, max	0.04%	0.05%	0.05%
Sulfur, max	0.04%	0.03%	0.03%
Silicon	0.15 - 0.35%	1.00% max	1.00% max
Chromium	0.80 - 1.10%	18.0 - 20.0%	16.0 - 18.0%
Nickel	-	8.0 - 11.0%	10.0 - 14.0%
Molybdenum	0.15 - 0.25%	-	2.00 - 3.00%

A193 Recommended Hardware

Bolt Grade	Nuts	Washers
B7	A194 Grade 2H	F436
Class 1: B8	A194 Grade 8	SS304
Class 1: B8M	A194 Grade 8M	SS316
Class 2: B8M	A194 Grade 8M	SS316

ISO 898-1 2009(DIN931 / 933) Grade

Standard for Bolt	Grade	Bolt Size	Tensile Strength	Yield Strength	Proof Load Stress	Elongation	Hardness
		mm	Mpa	Mpa	Mpa	%
ISO 898-1 2009(DIN931/933)	4.8		420min	340min	310	-	B71-95
	5.8		520min	420min	380	-	B82-95
	6.8		600min	480min	440	-	B89-99.5
	8.8	≤16	800min	640min	580	12	C22-32
	8.8	>16	830min	660min	600	12	C23-34
	10.9		1000min	940min	830	9	C32-39
	12.9		1200min	1100min	970	8	C39-44

Bolt FAQ

What are the key differences between F1554 Grades 36, 55, and 105?

ASTM F1554 covers anchor bolts used in concrete foundations.

Grade 36 is a low-carbon steel option with a minimum yield strength of 36 ksi, suitable for general-purpose anchoring.
Grade 55 offers medium strength (55 ksi yield) and is optionally weldable (check “Supplementary Requirement S1”).
Grade 105 is a high-strength quenched and tempered alloy bolt with a minimum yield of 105 ksi, used for critical structural anchoring applications.
Choosing the correct grade depends on structural load, ductility requirements, and whether welding is involved.

What are the common coating options for bolts?

Typical coatings include plain (uncoated), zinc plated, hot-dip galvanized (HDG), black oxide, and fluoropolymer (e.g., Xylan) finishes. Each offers different levels of corrosion resistance and is suited to specific environments.

What’s the difference between a bolt and a rod?

A bolt typically has a formed head and is used with a nut for clamping parts together. A rod (usually threaded rod) is headless, fully or partially threaded, and used for anchoring, bracing, or custom-length fastening.

Need Help Finding the Right Nuts or Washers for Your Bolts or Structural Assemblies?

Contact our team at sales@tuhufasteners.com with your requirements. We’ll help you select the best-fit bolts, nuts, and washers for your project based on application needs and relevant standards.

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