SAE J429

SAE J429 Specification

SAE J429 Standard covers the mechanical and material requirements for inch series carbon and alloy steel bolts, screws, studs, 12 Point Bolts & U Bolts upto 1-1/2 inch.

Scope

High-Quality SAE J429 Standard Fasteners – Adfast Component LTD

Adfast Component LTD offers premium-grade bolts, screws, stud bolts, 12-point bolts, and U-bolts that meet the SAE J429 standard. Our products are manufactured using high-quality carbon and alloy steel, ensuring superior strength and durability for industrial applications. Available in inch series sizes up to 1-1/2 inches, we provide reliable fastening solutions for various industries.

We stock fasteners in multiple grades, including 1, 2, 5, 5.2, 8, and 8.2, designed to meet diverse mechanical and material requirements. Whether you need standard or high-strength bolts, Adfast Component LTD ensures precision, performance, and compliance with industry standards.

Related Specifications

Chemical Composition

Grade Designation	Products	Nominal Size Dia, In	Material	C, Min	C, Max	Mn, Min	P, Max	S, Max	B, Min	B, Max	Grade ldentification Marking
1	Bolts, Screws, Studs	1/4 thru 1-1/2	Low or Medium Carbon Steel		0.55		0.025	0.025			None
2	Bolts, Screws, Studs	1/4 thru 1-1/2	Low or Medium Carbon Steel	0.15	0.55		0.025	0.025⁽²⁾			None
4	Studs	1/4 thru 1-1/2	Medium Carbon Steel	0.28	0.55		0.025	0.13			None
5	Bolts, Screws, Studs	1/4 thru 1-1/2	Medium Carbon Steel⁽³⁾ or	0.28	0.55		0.025	0.025⁽⁴⁾
5	Bolts, Screws, Studs	1/4 thru 1-1/2	Carbon Steel with additives (e.g. Boron⁽⁶⁾ or Cr,	0.15	0.40		0.025	0.025⁽⁴⁾	0.0005	0.003
5.1⁽⁵⁾	SEMS	No 4 thru 5/8	Low or Medium Carbon Steel⁽³⁾	0.15	0.30		0.025	0.025
5.2	Bolts, Screws	1/4 thru 1	Low Carbon Boron Steel⁽⁵⁾	0.15	0.25	0.74	0.025	0.025	0.0005	0.003
8	Bolts, Screws, Studs	1/4 thru 1-1/2	Medium Carbon Steel Or	0.25	0.55		0.025	0.025⁽⁴⁾
			Alloys^{(s, 7, 8)} Steel with additives (e.g. Bo- ron<9 l or Cr, or Mn) Or	0.20	0.55		0.025	0.025⁽⁴⁾
			Medium Carbon^{(6 · 7 • 8} ⁾ Alloy Steel	0.28	0.55		0.025	0.025
8.1	Studs	1/4 thru 1-1/2	Medium Carbon Alloy ^{(5 7 * 8)} or SAE 1541 Steel	0.28	0.55		0.025	0.040			None
8.2	Bolts, Screws	1/4 thru 1	Low Carbon Boron SteeI ⁽⁵⁾	0.15	0.25	0.74	0.025	0.025	0.0005	0.003
All values are for product analysis (percent by weight). For cast or heat analysis, use standard permissible varia tions as shown in SAE J409. For studs only, sulfur content may be 0.33% maximum. For Grades 5 and 5.1, fasteners, medium carbon boron or medium carbon alloy steels, as specified for Grade 8 fasteners, may also be used at the manufacturer’s option. For studs only, sulfur content may be 0.13% maximum. Grade 5 material heat treated before assembly with a hardened washer is an acceptable substitute. When the carbon content in boron steel is less than 0.25% the minimum manganese shall be 0.60% for Grades 5, 5.1, and 5.2 and 0.70% for Grades 8, 8.1, and 8.2. Alloy steel shall contain at least one of the following elements in the minimum quantity given: chromium 0.30%, nickel 0.30%, molybdenum 0.20%, vanadium 0.10%, manganese 1.65%. Where elements are specified in combi nations of two, three, four, or five and have alloy contents less than those given above, the limit value to be applied for steel class determination is 70% of the sum of the individual limit values shown above for the two, three, four or five elements concerned. When alloy steels are in the “as quenched” condition, prior to tempering, the microstructure in the core of the threaded section shall be approximately 90% martensite (refer to Table 3). When boron is added the limits shall be 0.0005% to 0.003%.

Mechanical Requirements

Mechanical Requirement
Testing Requirements
Proof Load And Tensile Strength

Grade Designation	Products	Nominal Size Dia, In	Full Size⁽⁷⁾Bolts, Screws, Studs, Sems, Proof Load (Stress), psi	Full Size⁽⁷⁾Bolts, Screws, Studs, Sems, Tensile Strength (Stress) Min, psi	Machine Test Specimens of Bolts, Screws, and Studs Yield⁽²⁾Strength (Stress) Min, psi	Machine Test Specimens of Bolts, Screws, and Studs Tensile Strength (Stress) Min, psi	Machine Test Specimens of Bolts, Screws, and Studs Elongation Min,%	Machine Test Specimens of Bolts, Screws, and Studs Reduction of Area Min,%	Surface Hardness Rockwell 30N Max	Core Hardness Rockwell Min	Core Hardness Rockwell Max	Grade Identification Marking⁽³⁾
1	Bolts, Screws, Studs	1/4 thru 1-1/2	33,000⁽⁴⁾	60,000	36,000	60,000	18	35	–	B70	B100	None
2	Bolts, Screws, Studs	1/4 thru 3/415)	55,000⁽⁴⁾	74,000	57,000	74,000	18	35	–	B80	B100	None
2	Bolts, Screws, Studs	Over 3/4 thru 1-1/2	33,000	60,000	36,000	60,000	18	35	–	B70	B100	None
4	Studs	1/4 thru 1-1/2	65,000	115,000	100,000	115,000	10	35	–	C22	C32	None
5	Bolts, Screws, Studs	1/4 thru 1	85,000	120,000	92,000	120,000	14	35	54	C25	C34
5	Bolts, Screws, Studs	Over 1 thru 1-1/2	74,000	105,000	81,000	105,000	14	35	50	C19	C30
5.1⁽⁶⁾	SEMS	No. 4 thru 5/8	85,000	120,000	–	–	–	–	59.5	C25	C40
5.2	Bolts, Screws	1/4 thru 1	85,000	120,000	92,000	120,000	14	35	56	C26	C36
8	Bolts, Screws, Studs	1/4 thru 1-1/2	120,000	150,000	130,000	150,000	12	35	58.6	C33	C39
8.1	Studs	1/4 thru 1-1/2	120,000	150,000	130,000	150,000	10	35	58.6	C33	C39	None
8.2	Bolts, Screws	1/4 thru 1	120,000	150,000	130,000	150,000	10	35	58.6	C33	C39
See footnote 2 of the Scope. Yield strength is stress at which a permanent set of 0.2% of gage length occurs. Not applicable to studs or slotted and cross recess head products. Proof load test. Requirements in these grades only apply to stress relieved products. Grade 2 requirements for sizes 1/4 through 3/4 in. apply only to bolts and screws 6 in. and shorter in length, and to studs of all lengths. For bolts and screws longer than 6 in., Grade 1 requirements shall apply. Grade 5 material heat treatment before assembly with a hardened washer is an acceptable substitute. Full Size means a tension test specimen consisting of a completed fastener for testing in the ready to use condition without alteration.

Product	Grade	Specified Minimum Ultimate Tensile Load “lb”	Length of Product ^{(1 4)}	Hardness⁽²⁾ Max	Hardness⁽¹⁾ Min	Tests Conducted Using Full Size Products⁽¹⁾ Proof Load	Tests Conducted Using Full Size Products⁽¹⁾ Wedge Tensile Strength
Short Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	All	Less than 2-1/20	*	*	–	–
Special Head⁽⁵⁾ Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	All	All	*	*	–	–
Square and Hex Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	100,000 and less	2-1/20 to 80 or 8 in., whichever is greater	*	–	Option C	*
			Over 80 or8 in., whichever is greater, thru and including 12 in.	*	–	Option C	*
			Over 12 in.	*	–	Option C	Option A
		Over 100,000	2-1/20 and longer	*	–	Option C	Option A
All Other Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	100,000 and less	2-1/20 to 80 or 8 in., whichever is greater	*	–	Option C	–
		100,000 and less	Over 80 or 8 in., whichever is greater	*	–	Option C	–
		Over 100,000	2-1/20 and longer	*	–	Option C	–
Short Studs	1, 2, 4, 5, 8, 8.1	All	Less than 30	*	*	–	–
All Other Studs	1, 2, 4, 5, 8, 8.1	100,000 and less	30 to 80 or 8 in., whichever is greater	*	–	Option C	*
		100,000 and less	Over 80 or 8 in., whichever is greater	*	–	Option C	Option A
		Over 100,000	30 and longer	*	–	Option C	Option A
Short Bolts, Screws and Sems	5.1	All	Less than 2-1/20	*	*	–	–
Hex Head Bolts, Screws and Sems	5.1	All	2-1/20 and longer	*	–	Option C	*
Other Bolts, Screws and Sems	5.1	All	2-1/20 and longer	*	–	Option C	–

Product	Grade	Tests Conducted Using Full Size Products^<1> Axial Tensile Strength	Tests Conducted Using Machine Test Specimens^<1> Yield Strength	Tests Conducted Using Machine Test Specimens^<1> Axial Tensile Strength	Tests Conducted Using Machine Test Specimen^<1> Elongation	Tests Conducted Using Machine Test Specimens^<1> Reduction of Area	Surface Hardness max^<3>	Decarburization in Threaded Section^<2>
Short Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	–	–	–	–	–	*	Option C
Special Head⁽⁵⁾ Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	–	–	–	–	–	*	Option C
Square and Hex Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	–	–	–	–	–	*	Option C
		–	Option B	Option B	Option B	Option B	*	Option C
		–	Option B	Option B	Option B	Option B	*	Option C
		–	Option B	Option B	Option B	Option B	*	Option C
All Other Bolts and Screws	1, 2, 5, 5.2, 8, 8.2	*	–	–	–	–	*	Option C
		Option A	Option B	Option B	Option B	Option B	*	Option C
		Option A	Option B	Option B	Option B	Option B	*	Option C
Short Studs	1, 2, 4, 5, 8, 8.1	–	–	–	–	–	*	Option C
All Other Studs	1, 2, 4, 5, 8, 8.1	–	–	–	–	–	*	Option C
		–	Option B	Option B	Option B	Option B	*	Option C
		–	Option B	Option B	Option B	Option B	–	Option C
Short Bolts, Screws and Sems	5.1	–	–	–	–	–	*	Option C
Hex Head Bolts, Screws and Sems	5.1	–	–	–	–	–	*	Option C
Other Bolts, Screws and Sems	5.1	*	–	–	–	–	*	Option C
Tests to be performed in accordance with paragraph		6.5	6.7	6.7	6.7	6.7	6.2	4.5
For purposes of Table 4 requirements, “length of product” is the nominal length including point chamfer as defined in ASME B18.2.1 and all special point products which shall be measured from the bearing surface to the crest of the last complete thread form. Asterisks (*) denote mandatory tests. Where options are indicated, all Option A tests (which apply to full size products) or all Option B tests (which apply to machined specimens) shall be performed. Option C tests (which apply to full size products) are not mandatory unless specified in the original inquiry and purchase order. Option A and Option C tests shall be performed in case arbitration is necessary. Surface hardness and decarburization requirements apply only to Grades 5, 5.1, 5.2, 8, 8.1, and 8.2. D equals diameter of the product. Special head bolts and screws are those with special configurations or with drilled heads which are weaker than the threaded section.

Nominal Dia of Product and Threads per in.	Stress Area, in²	Grade 1		Grade 2		Grade 4		Grade 5 & 5.2(2)		Grade 5.1		Grade 8, 8.1, 8.2(2)
Nominal Dia of Product and Threads per in.	Stress Area, in²	Proof Load, lb	Tensile Strength Min, lb	Proof Load, lb	Tensile Strength Min, lb	Proof Load, lb	Tensile Strength Min, lb	Proof Load, lb	Tensile Strength Min, lb	Proof Load, lb	Tensile Strength Min, lb	Proof Load, lb	Tensile Strength Min, lb
Coarse Thread Series UNC
No. 6-32	0.00909	–	–	–	–	–	–	–	–	750	1,100	–	–
8-32	0.014	–	–	–	–	–	–	–	–	1,200	1,700	–	–
10-24	0.0175	–	–	–	–	–	–	–	–	1,500	2,100	–	–
12-24	0.0242	–	–	–	–	–	–	–	–	2,050	2,900	–	–
1/4-20	0.0318	1,050	1,900	1,750	2,350	2,050	3,650	2,700	3,800	2,700	3,800	3,800	4,750
5/16-18	0.0524	1,750	3,150	2,900	3,900	3,400	6,000	4,450	6,300	4,450	6,300	6,300	7,850
3/8-16	0.0775	2,550	4,650	4,250	5,750	5,050	8,400	6,600	9,300	6,600	9,300	9,300	11,600
7/16-14	0.1063	3,500	6,400	5,850	7,850	6,900	12,200	9,050	12,800	9,050	12,800	12,800	15,900
1/2-13	0.1419	4,700	8,500	7,800	10,500	9,200	18,300	12,100	17,000	12,100	17,000	17,000	21,300
9/16-12	0.182	6,000	10,900	10,000	13,500	11,800	20,900	15,500	21,800	15,500	21,800	21,800	27,300
5/8-12	0.226	7,450	13,600	12,400	16,700	14,700	25,400	19,200	27,100	19,200	27,100	27,100	33,900
3/4-10	0.334	11,000	20,000	18,400	24,700	21,700	38,400	28,400	40,100	–	–	40,100	50,100
7/8-9	0.462	15,200	27,700	15,200	27,700	30,000	53,100	39,300	55,400	–	–	55,400	69,300
1-8	0.606	20,000	36,400	20,000	36,400	39,400	69,700	51,500	72,700	–	–	72,700	90,900
1-1/8-7	0.763	25,200	45,800	25,200	45,800	49,600	87,700	56,500	80,100	–	–	91,600	1,14,400
1-1/4-7	0.969	32,000	58,100	32,000	58,100	63,000	1,11,400	71,700	1,01,700	–	–	1,16,300	1,45,400
1-3/8-6	1.155	38,100	69,300	38,100	69,300	75,100	1,32,800	85,500	1,21,300	–	–	1,38,600	1,73,200
1-1/2-6	1.405	46,400	84,300	46,400	84,300	91,300	1,61,600	1,04,000	1,47,500	–	–	1,68,600	2,10,800
Fine Thread Series UNF
No. 6-40	0.01015	–	–	–	–	–	–	–	–	850	1,200	–	–
8-36	0.01474	–	–	–	–	–	–	–	–	1,250	1,750	–	–
10-32	0.02	–	–	–	–	–	–	–	–	1,700	2,400	–	–
12-28	0.0258	–	–	–	–	–	–	–	–	2,200	3,100	–	–
1/4-28	0.0364	1,200	2,200	2,000	2,700	2,350	4,200	3,100	4,350	3,100	4,350	4,350	5,450
5/16-24	0.058	1,900	3,500	3,200	4,300	3,750	6,700	4,900	6,950	4,900	6,950	6,950	8,700
3/8-24	0.0878	2,900	5,250	4,800	6,500	5,700	10,100	7,450	10,500	7,450	10,500	10,500	13,200
7/16-20	0.1187	3,900	7,100	6,550	8,800	7,700	13,650	10,100	14,200	10,100	14,200	14,200	17,800
1/2-20	0.1599	5,300	9,600	8,800	11,800	10,400	18,400	13,600	19,200	13,600	19,200	19,200	24,000
9/16-18	0.203	6,700	12,200	11,200	15,000	13,200	23,300	17,300	24,400	17,300	24,400	24,400	30,400
5/8-18	0.256	8,450	15,400	14,100	18,900	16,600	29,400	21,800	30,700	21,800	30,700	30,700	38,400
3-4-16	0.373	12,300	22,400	20,500	27,600	24,200	42,900	31,700	44,800	–	–	44,800	56,000
7/8-14	0.509	16,800	30,500	16,800	30,500	33,100	58,500	43,300	61,100	–	–	61,100	76,400
1-12	0.663	21,900	39,800	21,900	39,800	43,100	76,200	56,400	79,600	–	–	79,600	99,400
1 -14 UNS	0.679	22,400	40,700	22,400	40,700	44,100	78,100	57,700	81,500	–	–	81,500	1,01,900
1-1/8-12	0.856	28,200	51,400	28,200	51,400	55,600	98,400	63,300	89,900	–	–	1,02,700	1,28,400
1-1/4-12	1.073	35,400	64,400	35,400	64,400	69,700	1,23,400	79,400	1,12,700	–	–	1,28,800	1,61,000
1-3/8-12	1.315	43,400	78,900	43,400	78,900	85,500	1,51,200	97,300	1,38,100	–	–	1,57,800	1,97,200
1-1/2-12	1.581	52,200	94,900	52,200	94,900	1,02,800	1,81,800	1,17,000	1,66,000	–	–	1,89,700	2,37,200
Proof loads and tensile strengths are computed by multiplying the proof load stresses and tensile strength stresses given in Table 1 by the stress area of the thread. The stress area of sizes and thread series not included in Table 5 may be computed from the formula: A₈ = 0.7854 [D – (0.9743/n)]2 where D equals nominal diameter in inches and n equals threads per inch. Grades 5.2 and 8.2 applicable to sizes 1/4 through 1 in.

Coating Specifications

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Testing Standards

E18 Test Methods for Rockwell Hardness of Metallic Materials.
F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets.
A788/A788M for Steel Forgings, General Requirements.
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.

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