ASME B 18.3 (Table 8-III) - 2012 Hexagon Socket Flat Countersunk Head Cap

Unit:

Nominal Diameter
d

d	Nominal Diameter
PP	UNC
	UNF
	UNEF
d_s	max
d_s	min
d_k	max
d_k	min
k	Ref
A	Ref.
t	min
b	min
α	±2°
Socket No.

0.086	0.112	0.125
56	40	40
64	48	44
-	-	-
0.086	0.112	0.125
0.0822	0.1075	0.1202
0.197	0.255	0.281
0.168	0.218	0.24
0.064	0.083	0.09
0.094	0.111	0.111
0.03	0.035	0.04
0.62	0.75	0.75
82°	82°	82°
T8	T10	T10

①,Material
a、Alloy steel shall conform in all respects to ASTM F835
b、Corrosion-resistant steel shall conform in all respects to ASTM F879

GB /T 2673.2 - 2020

Hexalobular Socket High Countersunk Head Screws

GB /T 2673.1 - 2018

Hexalobular Socket Countersunk Flat Head Screws
Suppliers(1)

GB /T 2673 - 2007

Hexalobular Lobular Socket Countersunk Head Screws
Suppliers(1)

GB 2673 - 1986

Hexagon Lobular Socket Countersunk Head Screws
Suppliers(1)

ISO 14581 - 2022

Hexalobular Socket Countersunk Flat Head Screws (common head style) with Reduced Loadability
Suppliers(3)

ISO 14581 - 2013

Fasteners — Hexalobular Socket Countersunk Flat Head Screws
Suppliers(3)

ISO 14582 - 2013

Hexalobular Socket Countersunk Head Screws, High Head

Q 258

Hexagon Lobular Socket Countersunk Head Screws

NF E 25-107 - 2007

Screws with Six Lobes Recessed Countersunk Head - Symbol FX

YJT 4029

Suppliers(1)

DIN EN ISO 14581 - 2023

Hexalobular Socket Countersunk Flat Head Screws (Common Head Style) with Reduced Loadability

QC /T 856 - 2011

Hexalobular Socket Countersunk Head Screws

ASME B 18.6.3 (H1B-VI) - 2024

82° Hexalobular Socket Countersunk Flat Head Screws [TABLE 2.2.1-2 VI]

ASME B 18.6.3 (T2-VI) - 2013

82° Hexalobular Socket Countersunk Flat Head Screws

JASO F 116 - 2005

T-type TORX Countersunk Head Bolts

JASO F 116 - 2005

T-type TORX Countersunk Head Machine Screws

Shanghai ATM Precision Fastening Technology Co., Ltd.
Contact:	Xu Hai
Cellphone：	+86-18621311857
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Materials: 301, 302, 303, 304, 304L, 316, 316L, 316Ti, 317L, 310S, 321, 347, 1.4529, 1.4539, 1.4462, 1.4547, 1.4980, 904L, 2205, 2507, 2520, S32750, S32760, 1Cr13, 1Cr17, 2Cr13, 3Cr13, 14Cr17Ni2, 410, 416, 420, 430, 431, 440, 630, 631, 17-4PH, MP35N, 600, 601, 625, 660, 718, 750, 800, 825, 925, 926, C22, C276, A286, GH2132, GH4033, GH4080, GH4169, GH4145, 9C18Mo, 4Cr10Si2Mo, 35CrMoA, 42CrMoA, 40CrNiMoA, 25Cr2Mo1VA, SCM435, SCM440, 4130, 4140, 4145, A36, A307, A320, A325, A490, A574, F1554; stainless steel, alloy steel, titanium alloys, nickel-based alloys, high-temperature alloys, corrosion-resistant alloys, nickel-cobalt alloys, special alloys, and other special materials per customer specifications. Grades: A1-50, A2-50, A2-70, A2-80, A3-70, A4-70, A4-80, A4-90, A4-100, A5-80, B8, B8M, B8C, B8T, B6, B7, B7M, B16, C1-50, C1-70, C1-110, C3-80, C3-120, C4-70, D2-80, D2-100, D4-80, D4-100, D6-80, D6-100, D8-80, D8-100, P1-90, P1-120, F51, F53, F55, F60, 10.9, 12.9, 14.9, 15.9, 16.9; Other grades available upon request. Specifications: M3–M120, 1/4"–4". No limitation on product diameter or length; custom non-standard parts can be manufactured upon request. Surface Treatments: passivation, black oxide, phosphating, electrophoretic coating, zinc plating, nickel plating, chrome plating, cadmium plating, gold plating, silver plating, tin plating, copper plating, zinc diffusion, marine zinc, aluminum diffusion, aluminum spraying, Dacromet, Geomet, Teflon coating, zinc-nickel alloy plating, nickel-cobalt alloy plating, hot-dip galvanizing, ceramic composite coatings, molybdenum disulfide coating, tungsten disulfide coating, nano-coatings, and other surface finishes per customer requirements.