ASTM A325 Type 1, Type 3 Bolts, Stud Bolts, Threaded Rods

Introduction
Grades
Chemical Composition Type 1 Type 3
Mechanical Properties Metric Imperial
Hardness Metric Imperial
Recommended Nuts
Recommended Washers
Marking

ASTM A325 / A325M - Standard Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum Tensile Strength

This specification covers two types of quenched and tempered steel heavy hex bolts in metric and imperial sizes for structural purpose. Metric size bolts are produced from M12 to M36 as per ASTM A325M & imperial size bolts are produced from 1/2" to 1-1/2" as per ASTM A325. These boltings are intended for used in structural connections. FerroBend manufactures and supplies ASTM A325 Type 1 & Type 3 heavy hex bolts with EN 10204 Type 3.1 Certification.

ASTM A325 Grades and Material Class

Grade	Class
Type 1	Carbon Steel, Carbon Boron Steel, Alloy Steel or Alloy Boron Steel
Type 2	Withdrawn
Type 3	A	B	C	D	E	F

ASTM A325 Type 1 Chemical Composition

Element
	Product Analysis %
	Carbon Steel	Carbon Boron Steel	Alloy Steel	Alloy Boron Steel
Carbon	0.28 - 0.55	0.28 - 0.55	0.28 - 0.55	0.28 - 0.55
Manganese	0.57 min	0.57 min	0.57 min	0.57 min
Phosphorus	0.048 max	0.048 max	0.040 max	0.040 max
Sulfur	0.058 max	0.058 max	0.045 max	0.045 max
Silicon	0.13 - 0.32	0.08 - 0.32	0.13 - 0.37	0.13 - 0.37
Boron	--	0.0005 - 0.003	--	0.0005 - 0.003

ASTM A325 Type 3 Chemical Composition

Element
	Product Analysis %
	A	B	C	D	E	F
Carbon	0.31 - 0.42	0.36 - 0.50	0.14 - 0.26	0.14 - 0.26	0.18 - 0.27	0.19 - 0.26
Manganese	0.86 - 1.24	0.67 - 0.93	0.76 - 1.39	0.36 - 1.24	0.56 - 1.04	0.86 - 1.24
Phosphorus	0.040 max	0.040 max	0.040 max	0.040 max	0.040 max	0.040 max
Sulfur	0.045 max	0.045 max	0.045 max	0.045 max	0.045 max	0.045 max
Silicon	0.13 - 0.37	0.25 - 0.55	0.13 - 0.37	0.20 - 0.55	0.13 - 0.37	0.13 - 0.37
Copper	0.22 - 0.48	0.17 - 0.43	0.17 - 0.53	0.27 - 0.53	0.27 - 0.63	0.17 - 0.43
Nickel	0.22 - 0.48	0.47 - 0.83	0.22 - 0.53	0.47 - 0.83	0.27 - 0.63	0.17 - 0.43
Chromium	0.42 - 0.68	0.47 - 0.83	0.27 - 0.53	0.45 - 1.05	0.55 - 0.95	0.42 - 0.68
Vanadium	--	--	0.010 min	--	--	--
Molybdenum	--	0.07 max	--	0.11 max	--	--
Titanium	--	--	--	0.06 max	--	--

ASTM A325 Mechanical Requirement (Metric)

Nominal Diameter, mm	Tensile Strength, min, Mpa	Yield Strength, min, Mpa	Elongation in 4D, min, %	Reduction in Area, min, %
Nominal Diameter, mm	Tensile Strength, min, Mpa	M12 to M36, Inclusive	830	Reduction in Area, min, %	660	14	35

ASTM A325 Mechanical Requirement (Imperial)

Nominal Diameter, mm	Tensile Strength, min, ksi	Yield Strength, min, ksi		Elongation in 4D, min, %		Reduction in Area, min, %
Nominal Diameter, mm	Tensile Strength, min, ksi	1/2" to 1", Inclusive	120	92		Reduction in Area, min, %	14		35
Over 1 to 1-1/2"	105	81		14		35

Hardness Requirements for ASTM A325 Bolts (Metric)

Bolt Size, mm	Bolt Length, mm
		Brinell		Rockwell C
		Min	Max	Min	Max
M12 to M24, inclusive	Less than 2D 2D and over	253 --	319 319	25 --	34 34
M25 to M36, Inclusive	Less than 3D 3D and over	253 --	319 319	25 --	34 34

Hardness Requirements for ASTM A325 Bolts (Imperial)

Bolt Size, Inch	Bolt Length, Inch
		Brinell		Rockwell C
		Min	Max	Min	Max
1/2" to 1", inclusive	Less than 2D 2D and over	253 --	319 319	25 --	34 34
1-1/8" to 1-1/2", inclusive	Less than 3D 3D and over	223 --	286 286	19 --	30 30

where D is nominal diameter or thread size

Recommended Nuts

Bolt Type and Finish	Nut Class & Finish Specification
Bolt Type and Finish	Nut Class & Finish Specification	Plaing (Non Coated)	ASTM F563/F563M Grade 8S or 8S3, Plain (Non Coated)
Zinc Coated	ASTM F563/F563M Grade 10S, Zinc Coated
Coated in accordance with ASTM F1136M, Grade 3	ASTM F563/F563M Grade 10S, Coated in accordance with ASTM F1136
Plain	ASTM F563/F563M Grade 8S3, Plain

Recommended Washers

Bolt Type and Finish	Washer Finish
Bolt Type and Finish	Washer Finish	Plaing (Non Coated)	ASTM F436/F436M, Plain (Non Coated)
Zinc Coated	ASTM F436/F436M, Zinc Coated
Coated in accordance with ASTM F1136M, Grade 3	ASTM F436/F436M, Coated in accordance with ASTM F1136
Plain	ASTM F436/F436M, Plain

ASTM A325 Type 1 & Type 3 Bolt Marking

Grade	Marking Details
Grade	Marking Details	Type 1	Type 1 bolts shall me marked "A325M" and "8S". In addition, bolts marked "8.8S" shall be an acceptable marking provided they also meet the requirements of ISO 7412.
Type 3	Type 1 bolts shall me marked "A325M" and "8S3". In addition, bolts marked "8.8S" shall be an acceptable marking provided they also meet the requirements of ISO 7412. The use of additional distinguishing marks to indicate the bolts are weathering steel shall be the manufacturer's discretion.