ASME B 18.3 (T1) - 2012 Hexagon Socket Head Cap Screws [Table 1] (ASTM A574 / F837)

Unit:

Size

d	Screw Diameter
PP	UNC
	UNF
	UNEF
d_s	max=nominal size
	min
d_k ^①	max
	min
k	max
	min
s	Nominal Size
t	min
b	min
c	chamfer or radius	max
r	chamfer or radius	max
w	min

0.06	0.073	0.086
-	64	56
80	72	64
-	-	-
0.06	0.073	0.086
0.0568	0.0695	0.0822
0.096	0.118	0.14
0.091	0.112	0.134
0.06	0.073	0.086
0.057	0.07	0.083
0.05	0.062	0.078
0.025	0.031	0.038
0.5	0.62	0.62
0.004	0.005	0.008
0.007	0.007	0.007
0.020	0.025	0.029

①,Material
a、Faricated from alloy steel and shall conform in all respects to ASTM A574
b、Faricated from corrosion-resistant steel and shall conform in all respects to ASTM F837
②,Heads may be plain or knurled at the option of the manufacturer, unless specified otherwise by the customer. For knurled screws, the maximum head diameter shall be measured across the tops of the knurl, and the minimum head diameter shall
be the diameter of the unknurled portion or the diameter across the tops of the knurl for those screws not having an unknurled portion, just above the radius or chamfer at the bottom edge of the head .
③,Thread. Thread shall be Unified external thread with radius root: Class 3A UNRC and UNRF Series for screw sizes 0 (0.060 in) through 1in.; Class 2A UNRC and UNRF Series for sizes over 1 in. to 1-1/2 in., inclusive; and Class 2A UNR Series for sizes larger than 1-1/2 in. For plated or unplated screws, acccptability shall be based upon System 22, ASME B1.3. Class 3A does not provide a plating allowance.
④,Surface Roughness. For alloy steel screws of sizes up to and incuding 5/8 in., and nominal lengths equal to or less than 8 times the basic screw diameter, the surface roughness of the screws shall not exceed 63 μin. (arithmetical average) on the fillet and head bearing surfaces, nor exceed 32 μin. (arithmetical average) on the threads. For larger sizes, longer lengths, and corrosion-resistant steel screws, the surface roughness of the screws shall not exceed 125 μin. (arithmetical average) on the body [see Note (8)], fillet [see Note (14)], and head bearing surfaces. Normally, it shall be sufficient to ascertain that these surfaces on screws have the equivalent of a smooth machined finish by visual comparison with known surface standards. However, where it is practical and deemed necessary to measure these surfaces with commercially available equipment, roughness measurements shall be taken axially on the body and fillet surfaces, and circumferentially on the bearing surface. (See ASME B46.1, Surface Texture .)

GB /T 70.1 - 2008

Hexagon Socket Head Cap Screws
Suppliers(5)

GB /T 70.1 - 2000

Hexagon Socket Head Cap Screws
Suppliers(5)

GB 70 - 1985

Hexagon Socket Cap Head Screws
Suppliers(5)

GB 70 - 1976

Hexagon Socket Head Cap Screws
Suppliers(5)

GB /T 70.6 - 2020

Hexagon Socket Head Cap Screws - Fine Pitch Thread

DIN 7984 - 2022

Hexagon Socket Head Cap Screws with Low Head with Reduced Loadability
Suppliers(2)

DIN 6912 - 2021

Hexagon Socket Head Cap Screws with Reduced Loadability - Low Head, with Centre
Suppliers(1)

DIN 7984 - 2021

Hexagon Socket Head Cap Screws with Low Head with Reduced Loadability
Suppliers(2)

DIN 6912 - 2009

Hexagon Socket Head Cap Screws with Centre, with Low Head
Suppliers(1)

DIN 7984 - 2009

Hexagon Socket Head Cap Screws with Low Head
Suppliers(2)

DIN 6912 - 2002

Hexagon Socket Thin Head Cap Screws with Pilot Recess
Suppliers(1)

DIN 7984 - 2002

Hexagon Socket Thin Head Cap Screws
Suppliers(2)

DIN 7964 (E) - 1990

Reduced Shanke Bolts and Screws with Coarse Thread - Hexagon Socket Head
Suppliers(1)

DIN 6912 - 1985

Hexagon Socket Thin Head Cap Screws with Pilot Recess
Suppliers(1)

DIN 7984 - 1985

Hexagon Socket Thin Head Cap Screws
Suppliers(2)

DIN 912 - 1983

Hexagon Socket Head Cap Screws
Suppliers(7)

DIN 251

Hexagon Socket Head with Serrated Flange Screws
Suppliers(1)

DIN 6929 (EE) - 2013

Hexagon Socket Head Cap Screws

ISO 4762 - 2004

Hexagon Socket Head Cap Screws
Suppliers(2)

ISO 4762 - 1997

Hexagon Socket Head Cap Screws
Suppliers(2)

ISO 12474 - 2010

Hexagon Socket Head Cap Screws with Metric Fine Pitch Thread

ISO 21269 - 2004

Hexagon Socket Head Cap Screws with Metric Fine Pitch Thread

JIS B 1176 - 2014

Hexagon Socket Head Cap Screws

JIS B 1176 - 2006

Hexagon Socket Head Cap Screws

JIS B 1176 - 1988

Hexagon Socket Head Cap Screws

Q 218B

JB /ZQ 4352 - 2006

Hexagon Socket Head Cap Screws

JB /ZQ 4352 - 1997

Hexagon Socket Head Cap Screws

JB /ZQ 4725 - 2006

Hexagon Socket Head Cap Screws - Thin Type

ASME/ANSI B 18.3 - 1986

Hexagon Socket Head Cap Screws
Suppliers(2)

ASME/ANSI B 18.3.1M - 1986 (R1993)

Metric Hexagon Socket Head Cap Screws

ASME/ANSI B 18.3.1M - 1986 (R2008)

Dimensions Of Metric Socket Head Cap Screws

ASME/ANSI B 18.3 - 2003 (R2008)

Spline Socket Head Cap Screws

UNI 5931 - 1984

Hexagon Socket Cheese Head Screws
Suppliers(1)

UNI 9327 - 1988

Hexagon Socket Cheese Head Thin Screws

NF E 25-125 - 2004

Hexagon Socket Head Cap Screws

NF L 22-220 - 1984

Hexagonal Socket Cylindrical Head Screw with Hole for Lockwire - ISO Thread, 4h Class

NF L 22-224 - 1984

Hexagonal Socket Cylindrical Head Screw, Threaded to Head, with Hole for Lockwire - ISO Thread, 4g class

BS 4168-1 - 1981

Metric Hexagon Socket Cheese Head Screws

BS 2470 - 1973

Hexagon Socket Cheese Head Cap Screws - BA Thread

BS 2470 - 1973

Hexagon Socket Cheese Head Screws - Unified Thread

BS 2470 - 1973

Hexagon Socket Cheese Head Cap Screws - BSW and BSF Thread

AS 1420 - 2008 (R2015)

ISO Metric Hexagon Socket Head Cap Screws

CNS 3932 - 1998

Hexagon Socket Cheese Head Screws

CNS 4555 - 1981

Hexagon Socket Cheese Head Screws

CNS 4556 - 1981

Hexagon Socket Head Cap Screws Short

GOST 11738 - 1984

Hexagon Socket Head Cap Screws, Accuracy Class A

KS B 1003 - 2015 (R2020)

Hexagon Socket Head Cap Screws

KS B 1003 - 2000

Hexagon Socket Head Cap Screws

JG /T 5057.10 - 1995

Construction Machinery and Equipment - High Strength Screw with HexagonSocket Cap Head

DIN EN ISO 12474 - 2011

Hexagon Socket Head Cap Screws with Metric Fine Pitch Thread
Suppliers(7)

DIN EN ISO 4762 - 2004

Hexagon Socket Head Cap Screws
Suppliers(7)

IS 2269 - 2006

Hexagon Socket Head Cap Screws

MS 16995 (H) - 1997

Screw, Cap, Socket Head - Hexagon, Corrosion Resistant Steel, UNC-3A

ASME B 18.3 - 2003 (R2008)

Hexagon Socket Head Cap Screws
Suppliers(2)

ASME B 18.3 (T12) - 2012

Low Head Hexagon Socket Cap Screws [Table 12] (ASTM F835)

ASME B 18.3 - 2003 (R2008)

Low Head Hexagon Socket Cap Screws

QJ 2582 (A) - 2011

Hexagon Socket Cap Screws in Titanium Alloys
Suppliers(1)

QJ 2582 - 1993

Hexagon Socket Cap Screws In Titanium Alloys
Suppliers(1)

HB 1- 149 - 1995

Hex Butt Joint Bolt

HB 1- 149 - 1983

Hex Butt Joint Bolt

GotopScrews International Co., Limited
Contact:	Manager Zhuang
Cellphone：	86-13008864675
email：	hongwei@gotopscrews.com
aterial: carbon steel, alloy steel, stainless steel, copper, aluminum, titanium; Specifications: #0~1/4; Length: 1~60mm; Surface Treatment: galvanizing, nickel plating, zinc nickel alloy, electrophoresis, dacromet, CD grain, PVD, etc.

Shanghai ATM Precision Fastening Technology Co., Ltd.
Contact:	Xu Hai
Cellphone：	+86-18621311857
QQ：	513543434
email：	asialuosi@163.com
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.