ASTM F3125 TECHNICAL DATA

Order A325 Heavy Hex Bolts Order DTI Washers

This specification covers chemical, physical and mechanical requirements for quenched and tempered bolts manufactured from steel and alloy steel, in inch and metric dimensions, in two strength grades, two types and two styles. This specification is a consolidation and replacement of six ASTM standards, including: A325, A325M, A490, A490M, F1852 and F2280.

Technical Data: ASTM F3125 Dimensions, Threads, and Markings ASTM F3125 Chemical Requirements ASTM F3125 Mechanical Property Requirements ASTM F3125 Hardness Requirements ASTM F3125 Style and Grade

	Inch		Metric		Inch		Metric
	120 ksi Min Tensile		830 MPa Min Tensile		150 ksi Min Tensile		1040 MPa Min Tensile
	Type 1	Type 3	Type 1	Type 3	Type 1	Type 3	Type 1	Type 3
Style - Heavy Hex Bolts
Dimensions, ASME^B	B18.2.6	B18.2.6	B18.2.6M	B18.2.6M	B18.2.6	B18.2.6	B18.2.6M	B18.2.6M
Thread Fit, ASME^B	B1.1 UNC 2A	B1.1 UNC 2A	B1.13M MC 6g	B1.13M MC 6g	B1.1 UNC 2A	B1.1 UNC 2A	B1.13M MC 6g	B1.13M MC 6g
Grade Marking^A,D	A325	A325	A325M	A325M	A490	A490	A490M	A490M
Style - Twist-Off Bolts
Dimensions, ASME^B	B18.2.6	B18.2.6	F	F	B18.2.6	B18.2.6	F	F
Thread Fit, ASME^B	B1.1 UNC 2A	B1.1 UNC 2A	F	F	B1.1 UNC 2A	B1.1 UNC 2A	F	F
Grade Marking^A,D	A325TC	A325TC	F	F	A490TC	A490TC	F	F
Alt. Marking^A,C	A325	A325	F	F	A490	A490	F	F
Recommended Nut and Washer
Recommended Nut and Washer
Plain Nut	A563 DH	A563 DH3	A563M 10S	A563M 10S3	A563 DH	A563 DH3	A563M 10S	A563M 10S3
Suitable Alternative^E	DH3, D, C, C3	C3	8S, 8S3, 10S3	8S3			10S3
Coated Nut	A563 DH	A563 DH3	A563M 10S	A563M 10S3	A563 DH	A563 DH3	A563M 10S	A563M 10S3
Flat, Bevel or Thick Washer if used	F436 - 1	F436 - 3	F436M - 1	F436M - 3	F436 - 1	F436 - 3	F436M - 1	F436M - 3
Flat, Bevel or Thick Washer if used	F436 - 1	F436 - 3	F436M - 1	F436M - 3	F436 - 1	F436 - 3	F436M - 1	F436M - 3

^A A325 and A325M bolts lengths up to 4D which are fully threaded but which are not required to be fully threaded by the relevant ASME standard shall be marked with a “T”, see Supplementary Requirement S1. Bolts with any other non-standard dimensions, including thread length, shall be marked with an “S”, see Supplementary Requirement S2.

^B Manufactured to the latest revision at the time of manufacture, UNC for inch series and Metric Coarse (MC) for Metric Series.

^C Previously used markings may be sold and used indefinitely, bolts must be manufactured to current marking requirements upon initial publication of this standard.

^D Other distinguishing markings for type 3 are permitted at the manufacturers option.

^E ASTM A194/A194M 2H heavy hex inch nuts may be used in place of A563 DH nuts on type 1 A325, A490, F1852 and F2280 bolts. 2H heavy hex metric nuts may be used in place of A563M 10S nuts on type 1 A325M and A490M bolts. When coated 2H nuts are used in place of DH or 10S nuts, the same requirements of A563, A563M, and this specification, including Annex A1, shall apply. These include, but are not limited to, overtap amount, coating grade, lubrication requirements, and proof load testing.

^F Metric dimensions and requirements for this style have not been established.

Heat Analysis	120 ksi/830 MPa Minimum				150 ksi/1040 MPa Minimum
	Grade A325, A325M, F1852				Grade A490, A490M, F2280
	Type 1	Type 3			Type 1	Type 3
	Carbon or Alloy Steel with or without Boron	Composition A	Composition B	Based on Corrosion Index^C	Alloy Steel with or without Boron	Based on Corrosion Index^C



Carbon	0.30 - 0.52	0.33 - 0.40	0.38 - 0.48	0.30 - 0.52 max	0.30 - 0.48^A	0.30 - 0.53
Manganese	0.60 min	0.90 - 1.20	0.70 - 0.90	0.60 min	0.60 min	0.60 min
Phosphorus, max	0.035	0.035	0.035	0.035	0.035	0.035
Sulfur, max	0.040	0.040	0.040	0.040	0.040	0.040
Silicon	0.15 - 0.30	0.15 - .30	0.30 - 0.50	B	B	B
Boron	0.003 max	B	B	B	0.003 max	B
Copper	B	0.25 - 0.45	0.20 - 0.40	0.20 - 0.60	B	0.20 - 0.60
Nickel	B	0.25 - 0.45	0.50 - 0.80	0.20D min	B	0.20^D min
Chromium	B	0.45 - 0.65	0.50 - 0.75	0.45 min	B	0.45 min
Vanadium	B	B	B	B	B	B
Molybdenum	B	B	0.06 max	0.10D min	B	0.10^D min
Titanium	B	B	B	B	B	B

^A Carbon requirement is 0.35-0.53 for 1-1⁄2 in. and M36 diameter bolts.
^B Not Specified.
^C See 6.3.
^D Either Nickel or Molybdenum must be present in the amount specified.

		120 ksi - A325, F1852			150 ksi - A490, F2280
	Stress Area^A	Tensile min	Proof Load Length Measurement min	Alternative Proof Load Yield Strength Method Min	Tensile min	Tensile max.	Proof Load Length Measurement min	Alternative Proof Load Yield Strength Method Min




in.	in2	lbf	lbf	lbf	lbf	lbf	lbf	lbf
1⁄2-13 UNC	0.142	17050	12050	13050	21300	24600	17050	18500
5⁄8-11 UNC	0.226	27100	19200	20800	33900	39100	27100	29400
3⁄4-10 UNC	0.334	40100	28400	30700	50100	57800	40100	43400
7⁄8-9 UNC	0.462	55450	39250	42500	69300	79950	55450	60100
1-8 UNC	0.606	72700	51500	55750	90900	104850	72700	78800
11⁄8-7 UNC	0.763	91600B	64900B	70250B	114450	132000	91550	99200
11⁄4-7 UNC	0.969	116300B	82400B	89200B	145350	167650	116300	126000
13⁄8-6 UNC	1.155	138600B	98200B	106300B	173250	199850	138600	150200
11⁄2-6 UNC	1.405	168600B	119500B	129300B	210750	243100	168600	182600
Above values based on		120000 psi	85000 psi	92000 psi	150000 psi	173000 psi	120000 psi	130000 psi
Above values based on		120000 psi	85000 psi	92000 psi	150000 psi	173000 psi	120000 psi	130000 psi
		830 MPa - A325M			1040 MPa - A490M
	Stress Area^A	Tensile min.	Proof Load Length Measurement min	Alternative Proof Load Yield Strength Method Min	Tensile min	Tensile max.	Proof Load Length Measurement min	Alternative Proof Load Yield Strength Method Min




mm	mm2	kN	kN	kN	kN	kN	kN	kN
M12 x 1.75 MC	84.3	70	50.6	55.6	87.7	103	70	79.2
M16 x 2.0 MC	157	130	94.2	104	163	190	130	148
M20 x 2.5 MC	245	203	147	162	255	296	203	230
M22 x 2.5 MC	303	251	182	200	315	366	251	285
M24 x 3.0 MC	353	293	212	233	367	427	293	332
M27 x 3.0 MC	459	381	275	303	477	555	381	431
M30 x 3.5 MC	561	466	337	370	583	679	466	527
M36 x 4.0 MC	817	678	490	539	850	989	678	768
Above values based on		830 MPa	600 MPa	660 MPa	1040 MPa	1210 MPa	830 MPa	940 MPa
Above values based on		830 MPa	600 MPa	660 MPa	1040 MPa	1210 MPa	830 MPa	940 MPa

^A The stress area is calculated as follows for inch: AS = 0.7854 [D – (0.9743/P)]2; for Metric: AS = 0.7854 (D – 0.9382P)2; where AS = Stress Area, D = Nominal Bolt Size, and P = thread pitch.

^BPrevious versions of A325 and F1852 required tensile testing based on 105 ksi min. tensile strength for larger diameters, and proof load testing of 74 ksi (length measurement method) and 81 ksi (yield strength method). This specification was changed to align with AISC/RCSC design and installation values and metric equivalent strength levels.

			120 ksi/830 MPa Tensile,			150 ksi/1040 MPa Tensile,
			Grade A325, A325M, F1852			Grade A490, A490M, F2280
		Brinell HB		Rockwell HRC		Brinell HB		Rockwell HRC
		Min	Max	Min	Max	Min	Max	Min	Max
Up to 1 in., M24 Inclusive	Less than 2D	253	319	25	34	311	352	33	38
Up to 1 in., M24 Inclusive	2D and longer	…	319	…	34	…	352	…	38
Over 1 in., M24	Less than 3D	253	319	25	34	311	352	33	38
Over 1 in., M24	3D and longer	…	319	…	34	…	352	…	38

Grade	Min. Strength	Type		Style
A325	120 ksi	1	3	Heavy Hex Head
A325M	830 Mpa	1	3	Heavy Hex Head
F1852	120 ksi	1	3	Twist-Off
A490	150 ksi	1	3	Heavy Hex Head
A490M	1040 Mpa	1	3	Heavy Hex Head
F2280	150 ksi	1	3	Twist-Off