ASTM F3125

ASTM F3125/F3125M Structural Bolts Specification

High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions

Related Specifications

Classification

Grade	Min. Strength	Type^A	Style
ASTM F3125/F3125M Grade A325	120 ksi	1 or 3	Heavy Hex Head
ASTM F3125/F3125M Grade A490	150 ksi	1 or 3	Heavy Hex Head
ASTM F3125/F3125M Grade F1852	120 ksi	1 or 3	Twist-Off
ASTM F3125/F3125M Grade F2280	150 ksi	1 or 3	Twist-Off
ASTM F3125/F3125M Grade A325M	830 MPa	1 or 3	Heavy Hex Head
ASTM F3125/F3125M Grade A490M	1040 MPa	1 or 3	Heavy Hex Head
(A) Type 1 – 120 ksi (830 MPa) – carbon steel, carbon boron steel, alloy steel or alloy steel with boron addition Type 3 – 120 ksi (830 MPa) or 150 ksi (1040 MPa) – weathering steel Type 1 – 150 ksi (1040 MPa) – alloy steel or alloy steel with boron addition

Dimensions, Threads, Marking, Matching Components

Type	Parameter	Inch				Metric
		120 ksi Min Tensile		150 ksi Min Tensile		830 MPa 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	B18.2.6	B18.2.6	B18.2.6M	B18.2.6M	B18.2.6M	B18.2.6M
	Thread Fit, ASME^B	B1.1 UNC 2A	B1.1 UNC 2A	B1.1 UNC 2A	B1.1 UNC 2A	B1.13M MC 6g	B1.13M MC 6g	B1.13M MC 6g	B1.13M MC 6g
	Grade Marking^A^,^D	A325	A325	A490	A490	A325M	A325M	A490M	A490M
Style – Twist-Off Bolts	Dimensions, ASME^B	B18.2.6	B18.2.6	B18.2.6	B18.2.6	^F	^F	^F	^F
	Thread Fit, ASME^B	B1.1 UNC 2A	B1.1 UNC 2A	B1.1 UNC 2A	B1.1 UNC 2A	^F	^F	^F	^F
	Grade Marking^A^,^D	A325TC	A325TC	A490TC	A490TC	^F	^F	^F	^F
	Alt. Marking^A^,^C	A325	A325	A490	A490	^F	^F	^F	^F
Recommended Nut and Washer	Plain Nut	A563 DH	A563 Dh3	A563 DH	A563 Dh3	A563M 10S	A563M 10S3	A563M 10S	A563M 10S3
	Suitable Alternative^E	Dh3, D, C, C3	C3	…	…	8S, 8S3, 10S3	8S3	10S3	…
	Coated Nut	A563 DH	A563 Dh3	A563 DH	A563 Dh3	A563M 10S	A563M 10S3	A563M 10S	A563M 10S3
	Flat, Bevel or Thick Washer if used	F436/F436M- 1	F436/F436M- 3	F436/F436M- 1	F436/F436M- 3	F436/F436M- 1	F436/F436M- 3	F436/F436M- 1	F436/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 non-standard thread length (except for bolts up to 4D threaded fully and marked with “T” per S1 requirement), 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 requirements include, but are not limited to, thread dimensions and overtapping allowances, coating grade, lubrication requirements, and proof load testing. (F) Metric dimensions and requirements for this style have not been established.

Chemical Composition

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
	C or Alloy Steel with or without Boron	Composition^A	Composition^B	Based on Corrosion Index^B	Alloy Steel with or without Boron	Based on Corrosion Index^B
C	0.30 – 0.52	0.33 – 0.40	0.38 -0.48	0.30 – 0.52 max	0.30 – 0.48^C	0.30 – 0.53
Mn	0.60 min	0.90 – 1.20	0.70 – 0.90	0.60 min	0.60 min	0.60 min
P, max	0.035	0.035	0.035	0.035	0.035	0.035
S, max	0.040	0.040	0.040	0.040	0.040	0.040
Si	0.15 – 0.30	0.15 – .30	0.30 – 0.50	^D	^D	^D
B	0.003 max	^D	^D	^D	0.003 max	^D
Cu	^D	0.25 – 0.45	0.20 – 0.40	0.20 – 0.60	^D	0.20 – 0.60
Ni	^D	0.25 – 0.45	0.50 – 0.80	0.20^E min	^D	0.20^E min
Cr	^D	0.45 – 0.65	0.50 – 0.75	0.45 min	^D	0.45 min
V	^D	^D	^D	^D	^D	^D
Mo	^D	^D	0.06 max	0.10^Emin	^D	0.10^E min
Ti	^D	^D	^D	^D	^D	^D
(A) Based on heat analysis. (B) Carbon requirement is 0.35-0.53 for 1-1/2 in. and M36 diameter bolts. (C) Not Specified. (D) Material that satisfies the criteria for either Nickel or Molybdenum shall be considered as satisfying the requirements for both elements.

Mechanical Requirements

ASTM F3125/F3125M Mechanical Property Requirements for Bolts Tested Full Size (Inch)

Size	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
	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	91600^B	64900^B	70250^B	114450	132000	91550	99200
1¹/₄-7 UNC	0.969	116300^B	82400^B	89200^B	145350	167650	116300	126000
1³/₈-6 UNC	1.155	138600^B	98200^B	106300^B	173250	199850	138600	150200
1¹/₂-6 UNC	1.405	168600^B	119500^B	129300^B	210750	243100	168600	182600
Above values based on		120 ksi	85 ksi	92 ksi	150 ksi	173 ksi	120 ksi	130 ksi

ASTM F3125/F3125M Mechanical Property Requirements for Bolts Tested Full Size (Metric)

Size	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
	mm²	kN	kN	kN	kN	kN	kN	kN
M12 x 1.75 MC	84.3	70	50.6	55.6	87.7	101	70	79.2
M16 x 2.0 MC	157	130	94.2	104	163	187	130	148
M20 x 2.5 MC	245	203	147	162	255	292	203	230
M22 x 2.5 MC	303	251	182	200	315	361	251	285
M24 x 3.0 MC	353	293	212	233	367	421	293	332
M27 x 3.0 MC	459	381	275	303	477	548	381	431
M30 x 3.5 MC	561	466	337	370	583	669	466	527
M36 x 4.0 MC	817	678	490	539	850	975	678	768
Above values based on		830 MPa	600 MPa	660 MPa	1040 MPa	1193 MPa	830 MPa	940 MPa
(A) The stress area is calculated as follows for inch: AS = 0.7854 [D – (0.9743/n)]2; for Metric: AS = 0.7854 (D – 0.9382P)2; where AS = Stress Area, D = Nominal Bolt Size, and P = thread pitch. (B) Previous versions of ASTM 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.

ASTM F3125/F3125M Mechanical Property Requirements for Specimens Machined from Bolts

Mechanical Property	Tensile min.	Tensile max.	Yield min.	Elongation in 4D, min. %	Reduction of Area, min. %
Inch 120 ksi, Grade A325, F1852	120 ksi	…	92 ksi	14	35
Inch 150 ksi, Grade A490, F2280	150 ksi	173 ksi	130 ksi	14	40
Metric 830 MPa, Grade A325M	830 MPa	…	660 MPa	14	35
Metric 1040 MPa, Grade A490M	1040 MPa	1193 MPa	940 MPa	14	40

ASTM F3125/F3125M Hardness Requirements for Bolts

1a20 ksi/830 MPa Tensile, Grade A325, A325M, F1852	150 ksi/1040 MPa Tensile, Grade A490, A490M, F2280
253	319	25	34	311	352	33	38

ASTM F3125/F3125M Twist-Off Style Assembly Installation Tension Test (Minimum Tension, lbf)

Bolt Diameter, in.	F1852	F2280
¹/₂-13 UNC	12550	15650
⁵/₈-11 UNC	19900	24900
³/₄-10 UNC	29450	36800
⁷/₈-9 UNC	40750	50950
1-8 UNC	53450	66800
1¹/₈-7 UNC	67350	84100
1¹/₄-7 UNC	85500	106850

ASTM F3125/F3125M Permitted Coatings

120 ksi & 830 MPa Bolt Assemblies^A		150 ksi & 1040 MPa Bolt Assemblies^A
Commonly Applied Coatings	Grade or Class	Qualified Coatings	Grade or Class
F2329	Hot Dip Galvanized / 50 µm	F1136/F1136M	Bolt & Washer Grade 3, Nut Grade 5
B695	Class 55	F2833	Grade 1
Other Coatings	Grade or Class	F3019/F3019M	Grade 4
F1136/F1136M	Bolt & Washer Grade 3, Nut Grade 5	…	…
F2833	Grade 1	…	…
F3019/F3019M	Grade 4	…	…
(A) Coatings for Twist-off style bolt assemblies shall be agreed upon between the producer, supplier and user, and are not permitted except when applied under the direction of the manufacturer.

ASTM F3125/F3125M Nut Overlap Allowances UNC Thread

Dimensional Limits	Galvanized B695/F2329^A			Zn/Al Coatings F1136/F1136M/F2833/F3019/F3019M^B^,^C^,^D
Dimensional Limits	Nut Pitch Dia. Overtap^E^,^F	Bolt Pitch Dia. OS After B695 Coating^G	Bolt Pitch Dia. OS After F2329Coating^G	Nut Pitch Dia. Overlap^E	Bolt Pitch Dia. OS after Coating^F
¹/₂-13	0.018	0.012	0.018	0.009	0.006
⁵/₈-11	0.020	0.013	0.020	0.010	0.007
³/₄-10	0.020	0.013	0.020	0.010	0.007
⁷/₈-9	0.022	0.015	0.022	0.011	0.008
1-8	0.024	0.016	0.024	0.012	0.008
1¹/₈-7	0.024	0.016	0.024	0.012	0.008
1¹/₄-7	0.024	0.016	0.024	0.012	0.008
1³/₈-6	0.027	0.018	0.027	0.014	0.010
1¹/₂-6	0.027	0.018	0.027	0.014	0.010

ASTM F3125/F3125M Nut Overlap Allowances MC Thread

Dimensional Limits	Galvanized B695/F2329^A			Zn/Al Coatings F1136/F1136M/F2833/F3019/F3019M^B^,^C^,^D
Dimensional Limits	Nut Pitch Dia. Overtap^E^,^F	Bolt Pitch Dia. OS After B695 Coating^G	Bolt Pitch Dia. OS After F2329Coating^G	Nut Pitch Dia. Overlap^E	Bolt Pitch Dia. OS after Coating^F
M12 × 1.75 MC	0.45	0.30	0.45	0.23	0.16
M16 × 2.0 MC	0.50	0.33	0.50	0.25	0.17
M20 × 2.5 MC	0.50	0.33	0.50	0.25	0.17
M22 × 2.5 MC	0.55	0.36	0.55	0.28	0.19
M24 × 3.0 MC	0.60	0.40	0.60	0.30	0.20
M27 × 3.0 MC	0.60	0.40	0.60	0.30	0.20
M30 × 3.4 MC	0.70	0.46	0.70	0.35	0.24
M36 × 4.0 MC	0.70	0.46	0.70	0.35	0.24
(A) Supplementary nut lubrication to A563 S1 is required for hot dip and mechanically deposited zinc coatings. (B) Grade 5 of F1136/F1136M coating meets the supplementary lubrication requirements of A563 S1. (C) Grade 1 of F2833 coating meets the supplementary lubrication requirements of A563 S1. (D) Nuts overtapped for coating for use with 150 ksi/1040 MPa minimum tensile strength fasteners shall be proof load tested to a minimum of 175,000 psi after overtapping. (E) Nut overtap shall not exceed this amount unless agreed upon between the purchaser and user. If a larger overtap is used or required, coated bolts and overtapped and coated nuts shall pass the RC test requirements per Annex A2 as proof of assembly, ductility and thread strength. (F) Bolt pitch oversize limit in case of dispute. Material within the plain gauge limits, which meets the coating thickness requirements and assembles freely need not be measured to this tolerance. (G) Hot-Dip galvanized is typically tapped after coating. Others coatings are typically applied after nut tapping.

ASTM F3125/F3125M Pre-tension Requirements by Strength and Diameter

Strength	Bolt Dia. (in.)	¹/₂	⁵/₈	³/₄	⁷/₈	1	1¹/₈	1¹/₄	1³/₈	1¹/₂
120 ksi min.	Initial Tension (kips)	1	2	3	4	5	6	8	10	12
150 ksi min.	Initial Tension (kips)	1	2	4	5	6	8	10	12	15
150 ksi min.	Bolt Dia. (mm)	12	16	20	22	24	27	30	…	36
830 MPa min.	Initial Tension (kN)	4	9	13	18	22	27	31	…	44
1040 MPa min.	Initial Tension (kN)	9	13	18	22	27	36	40	…	58

ASTM F3125/F3125M Maximum Permitted Torque at Minimum Design Tension^A

Strength	Bolt Dia. (in.)	¹/₂	⁵/₈	³/₄	⁷/₈	1	1¹/₈	1¹/₄	1³/₈	1¹/₂
120 ksi min.	Tension (kips)^A	12	19	28	39	51	64	81	97	1/18
120 ksi min.	Maximum Torque (ft. lbs.)	125	247	437	710	1062	1502	2120	2779	3688
150 ksi min.	Tension (kips)^A	15	24	35	49	64	80	102	121	148
	Maximum Torque (ft. lbs.)	156	312	546	893	1333	1875	2656	3466	4625
	Bolt Dia. (mm)	12	16	20	22	24	27	30	…	36
830 MPa min.	Tension (kN)^A	49	93	142	178	205	267	325	…	476
830 MPa min.	Maximum Torque (Nm)	150	380	719	976	1234	1803	2440	…	4284
1040 MPa min.	Tension (kN)^A	61	114	178	221	257	334	408	…	595
1040 MPa min.	Maximum Torque (Nm)	190	461	895	1220	1546	2251	3064	…	5369
(A) Minimum design in the RCSC Specification for Structural Joints Using High-Strength Bolts. It represents 70% of minimum specified tensile strength.

ASTM F3125/F3125M Minimum Required Degrees of Rotation

Bolt Length Required Rotation	Up to 4D	>4D to 8D	>8D to 12D
120 ksi (830 MPa) min	240	360	420
150 ksi (1040 MPa) min	240	300	360

ASTM F3125/F3125M Minimum Tension at Full Rotation

Strength	Bolt Dia. (in.)	¹/₂	⁵/₈	³/₄	⁷/₈	1	1¹/₈	1¹/₄	1³/₈	1¹/₂
120 ksi min.	Tension (kips)	14	22	32	45	59	74	94	112	136
150 ksi min.	Tension (kips)	17	28	40	56	74	92	117	139	170
150 ksi min.	Bolt Dia. (mm)	12	16	20	22	24	27	30	…	36
830 MPa min.	Tension (kN)	57	108	164	205	235	307	373	…	547
1040 MPa min.	Tension (kN)	72	133	205	256	297	384	471	…	685

ASTM F3125/F3125M Minimum Required Degrees of Rotation

Bolt Length	Up to and including 4D	Greater than 4D up to and including 8D
Required Rotation All Grades	120	180

ASTM F3125/F3125M Maximum Torque Values

Strength	Bolt Dia. (in.)	¹/₂	⁵/₈	³/₄	⁷/₈	1	1¹/₈	1¹/₄	1³/₈	1¹/₂
120 ksi min.	Torque (ft. lbs.)	150	290	500	820	1230	1730	2450	3210	4250
150 ksi min.	Torque (ft. lbs.)	180	370	630	1020	1540	2160	3050	3980	5310
150 ksi min.	Bolt Dia. (mm)	12	16	20	22	24	27	30	…	36
830 MPa min.	Torque (Nm)	176	427	827	1125	1416	2074	2807	…	4922
1040 MPa min.	Torque (Nm)	217	536	1024	1417	1790	2583	3539	…	6162

Hardness
Tensile Load Coarse
Tensile Load Fine
Tensile Strength

Nominal Diameter, in.	Nominal Length, in.	Brinell		Rockwell C
Nominal Diameter, in.	Nominal Length, in.	Min	Max	Min	Max
¹/₄ to 1, inclusive	Less than 2D	253	319	25	34
¹/₄ to 1, inclusive	2D and over	. . .	319	. . .	34
Over 1 to 1¹/₂ , inclusive	Less than 3D	223	286	19	30
Over 1 to 1¹/₂ , inclusive	3D and over	. . .	286	. . .	30
Over 1¹/₂ to 3, inclusive	Less than 3D	183	235	. . .	. . .
Over 1¹/₂ to 3, inclusive	3D and over	. . .	235	. . .	. . .
D = Nominal diameter or thread size

Bolt or Stud Diameter, in.

Threads per in.^A

Stress Area,^B in.²

Tensile Load, min, lbf^C

Proof Load, Length Measurement Method, lbf^C

Alternative Proof Load, Yield Strength Method (0.2 % Offset), lbf^C

¹/₄

0.0318

3 800

2 700

2 900

⁵/₁₆

0.0524

6 300

4 450

4 800

³/₈

0.0775

9 300

6 600

7 100

⁷/₁₆

0.1063

12 750

9 050

9 800

¹/₂

0.1419

17 050

12 050

13 050

⁹/₁₆

0.182

21 850

15 450

16 750

⁵/₈

0.226

27 100

19 200

20 800

³/₄

0.334

40 100

28 400

30 700

⁷/₈

0.462

55 450

39 250

42 500

0.606

72 700

51 500

55 750

1¹/₈

0.763

80 100

56 450

61 800

1¹/₄

0.969

101 700

71 700

78 500

1³/₈

1.155

121 300

85 450

93 550

1¹/₂

1.405

147 500

104 000

113 800

1³/₄

1.90

171 000

104 500

110 200

4¹/₂

2.50

225 000

137 500

145 000

2¹/₄

4¹/₂

3.25

292 500

178 750

188 500

2¹/₂

4.00

360 000

220 000

232 000

2³/₄

4.9397

443 700

271 150

286 000

5.97

537 300

328 350

346 200

(A) For 8 threads per in., sizes 11/8 to 11/2 in., inclusive, stresses of 105 000 psi, 74 000 psi, and 81 000 psi shall be used for calculating the values in columns 4, 5, and 6 respectively.

(B) The stress area is taken from ASME B1.1 which uses the equation below to calculate the values:

A_s = 0.7854[ D − (0.9743/n)]²

where: A_s = stress area,

D = nominal diameter, and

n = threads per in.

Bolt Size, in.	Column 4, psi	Column 5, psi	Column 6, psi
¹/₄ to 1, incl.	120 000	85 000	92 000
1¹/₈ to 1¹/₂ , incl.	105 000	74 000	81 000
1³/₄ to 3, incl.	90 000	55 000	58 000

Bolt or Stud Diameter, in.	Threads per in.	Stress Area,^A in.²	Tensile Load, min, lbf^B	Proof Load, Length Measurement Method, lbf^B	Alternative Proof Load, Yield Strength Method (0.2 % Offset), min, lbf^B
¹/₄	28	0.0364	4 350	3 100	3 500
⁵/₁₆	24	0.0580	6 950	4 950	5 350
³/₈	24	0.0878	10 550	7 450	8 100
⁷/₁₆	20	0.1187	14 250	10 100	10 900
¹/₂	20	0.1599	19 200	13 600	14 700
⁹/₁₆	18	0.203	24 350	17 250	18 700
⁵/₈	18	0.256	30 700	21 750	23 500
³/₄	16	0.373	44 750	31 700	34 300
⁷/₈	14	0.509	61 100	43 250	46 800
1	12	0.663	79 550	56 350	61 000
1¹/₈	12	0.856	89 900	63 350	69 350
1¹/₄	12	1.073	112 650	79 400	86 900
1³/₈	12	1.315	138 100	97 300	106 500
1¹/₂	12	1.581	166 000	117 000	128 000
(A) See footnote B in Table 4. (B) See footnote C in Table 4.

Nominal Size- Threads per Inch	UNC	Nominal Size- Threads per Inch	UNF	Nominal Size- Threads per Inch	8 UN
Nominal Size- Threads per Inch	Tensile Stress Area,^AA_s in.₂	Nominal Size- Threads per Inch	Tensile Stress Area^AA_s in.²	Nominal Size- Threads per Inch	Tensile Stress Area,^AA_s in.²
¹/₄ -20	0.0318	¹/₄ -28	0.0364	…	…
⁵/₁₆ -18	0.0524	⁵/₁₆ -24	0.0580	…	…
³/₈ -16	0.0775	³/₈ -24	0.0878	…	…
⁷/₁₆ -14	0.1063	⁷/₁₆ -20	0.1187	…	…
¹/₂ -13	0.1419	¹/₂ -20	0.1599	…	…
⁹/₁₆ -12	0.182	⁹/₁₆ -18	0.203	…	…
⁵/₈ -11	0.226	⁵/₈ -18	0.256	…	…
³/₄ -10	0.334	³/₄ -16	0.373	…	…
⁷/₈ -9	0.462	⁷/₈ -14	0.509	…	…
1-8	0.606	1-12	0.663	1-8	0.606
1¹/₈ -7	0.763	1¹/₈ -12	0.856	1¹/₈ -8	0.790
1¹/₄ -7	0.969	1¹/₄ -12	1.073	1¹/₄ -8	1.000
1³/₈ -6	1.155	1³/₈ -12	1.315	1³/₈ -8	1.233
1¹/₂ -6	1.405	1¹/₂ -12	1.581	1¹/₂ -8	1.492
1³/₄ -5	1.90	…	…	1³/₄ -8	2.08
2-4¹/₂	2.50	…	…	2-8	2.77
2¹/₄ -4¹/₂	3.25	…	…	2¹/₄ -8	3.56
2¹/₂ -4	4.00	…	…	2¹/₂ -8	4.44
2³/₄ -4	4.93	…	…	2³/₄ -8	5.43
3-4	5.97	…	…	3-8	6.51
3¹/₄ -4	7.10	…	…	3¹/₄ -8	7.69
3¹/₂ -4	8.33	…	…	3¹/₂ -8	8.96
3³/₄ -4	9.66	…	…	3³/₄ -8	10.34
4-4	11.08	…	…	4-8	11.81

Coating Specifications

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Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark Adfast Component LTD along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

Dimensional Standards

B18.31.2 Imperial Continious Thread, Double End Reduced & Full Body Studs
B18.31.1M Metric Continious Thread, Double End Reduced & Full Body Studs
B16.5 Imperial Full Thread Stud Bolts
B16.5 Metric Full Thread Stud Bolts
B18.2.1 Imperial Square and Hex Bolts and Screws
B18.3 Imperial Hexagon Socket and Spline Socket Screws

Certification

Testing Standards

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
E23 Test Methods for Notched Bar Impact Testing of Metallic Materials
E709 Guide for Magnetic Particle Testing
E1268 Practice for Assessing the Degree of Banding or Orientation of Microstructures
E1417/E1417M Practice for Liquid Penetrant Testing
E1444/E1444M Practice for Magnetic Particle Testing
E2884 Guide for Eddy Current Testing of Electrically Conducting Materials Using Conformable Sensor Arrays
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
F2328 Test Method for Determining Decarburization and Carburization in Hardened and Tempered, Threaded, Steel Bolts, Screws, Studs, and Nuts

Threading Specifications

ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.3 Screw Thread Gaging System for Dimensional Acceptability – Inch Screw Threads (IN, UNR, and UNJ)

Supplementary Requirements

S1	Bolts Threaded Full Length
S2	Alternate Dimensions
S3	Lubricant
S4	Rotational Capacity Testing for Plain and Other Coated Assemblies

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ASTM F3125

ASTM F3125/F3125M Structural Bolts Specification

Table of Contents

Related Specifications

Classification

Dimensions, Threads, Marking, Matching Components

Chemical Composition

Mechanical Requirements

ASTM F3125/F3125M Mechanical Property Requirements for Bolts Tested Full Size (Inch)

ASTM F3125/F3125M Mechanical Property Requirements for Bolts Tested Full Size (Metric)

ASTM F3125/F3125M Mechanical Property Requirements for Specimens Machined from Bolts

ASTM F3125/F3125M Hardness Requirements for Bolts

ASTM F3125/F3125M Twist-Off Style Assembly Installation Tension Test (Minimum Tension, lbf)

ASTM F3125/F3125M Permitted Coatings

ASTM F3125/F3125M Nut Overlap Allowances UNC Thread

ASTM F3125/F3125M Nut Overlap Allowances MC Thread

ASTM F3125/F3125M Pre-tension Requirements by Strength and Diameter

ASTM F3125/F3125M Maximum Permitted Torque at Minimum Design TensionA

ASTM F3125/F3125M Minimum Required Degrees of Rotation

ASTM F3125/F3125M Minimum Tension at Full Rotation

ASTM F3125/F3125M Minimum Required Degrees of Rotation

ASTM F3125/F3125M Maximum Torque Values

Coating Specifications

Renowned Brands

Bolting Components Marking

Dimensional Standards

Certification

Testing Standards

Threading Specifications

Supplementary Requirements

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ASTM F3125/F3125M Maximum Permitted Torque at Minimum Design Tension^A