ASME B 18.2.1 (T4) - 2012 Askew Head Bolts [Table 4] (ASTM A307 / A354 / A394)

Unit:

Thread Size
d

3/8

1/2

5/8

d
PP	UNC
d_s	max
	min
s	Basic
	max
	min
e	max
	min
k₁	max
	min
k	Ref.
r	max
	min
b	Ref	L≤6
		L＞6
S	max

0.3750	0.5000	0.6250
16	13	11
0.388	0.515	0.642
0.36	0.482	0.605
9/16	3/4	15/16
0.562	0.75	0.938
0.544	0.725	0.906
0.795	1.061	1.326
0.747	0.995	1.244
0.317	0.411	0.52
0.277	0.371	0.48
0.25	0.328	0.422
0.03	0.03	0.06
0.01	0.01	0.02
1	1.25	1.5
1.25	1.5	1.75
0.25	0.312	0.344

per 1000 units ≈ kg(7.85kg/cm3)

Reference only

Thread Length
b

Reference only

①,Thread Length. All askew head bolts of nominal lengths equal to or shorter than the nominal thread length, b, plus the unthreaded length, S, shall be threaded for full length. The distance from the bearing surface of the head, as measured at mid height of head to the last scratch of thread, shall not exceed S. The distance from the bearing surface of the head, as measured at mid height, to the first complete (full form) thread, as measured with a nonchamfered GO thread ring gage assembled by hand as far as the thread will permit, shall not exceed S plus a length of 2½ threads.
②,Thread Series. Askew head bolts are only available with unified course (UNC) threads.
③,b is a reference dimension tntended for calculation purposes only. When screw length L ≤ 6 in，b=2d+0.25；when L＞6 in，b=2d+0.5 。

GB /T 8 - 2021

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GB /T 35 - 2013

Square Head Bolts with Small Head

GB /T 35 - 1988

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GB 8 - 1988

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GB 8 - 1976

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DIN 21346 - 1989

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Fish Plate Bolt Square Head

JIS B 1182 (T1-1) - 1995

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Square Head Bolts [Table 1-3]

JIS B 1182 (T2) - 1995

Large Square Head Bolts [Table 2]

Q 194B

Small Square Head Bolts

ASME/ANSI B 18.2.1 (T1) - 1996

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UNI 5729 - 1965

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BS 916 - 1953

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BS 916 - 1953

Square Head Screws Faced Under Head with B.S.Threads - Black [Table 2]

BS 916 - 1953

Square Bolts Faced Under Head, and Faced Under Head and Turned on Shank with B.S.Threads - Black [Table 2]

BS 916 - 1953

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CNS 4699 - 1982

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CNS 3134 - 1981

Square Head Bolts (Finished)

CNS 3135 - 1981

Square Head Bolts (Semi-Finished)

CNS 3136 - 1981

Square Head Bolts (Regular)

CNS 3137 - 1981

Large Square Head Bolts (Regular)

GOST 21249 (-1) - 1996

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GOST 21249 (-2) - 1996

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ASME B 18.2.1 (T1) - 2012

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Suppliers(2)

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ASME B 18.2.3.10M - 1996

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