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BS 3692:2001 ISO metric precision hexagon bolts, screws and nuts – Specification

BS3692 gives the general dimensions and tolerances of precision hexagon bolts, screws and nuts with ISO
metric threads in diameters from 1.6mm to 68mm inclusive. Mechanical properties are given only in respect of carbon or alloy steel bolts, screws and nuts, which are not to be used for special applications, such as those requiring weldability, corrosion resistance or ability to withstand temperatures above 300ºC or below 50ºC.

Finishes

Steel precision bolts, screws and nuts are supplied with the following finishes:

– Heat-treated bolts and screws. Components heat-treated after manufacture are customarily dull black, although the manufacturer may machine some of the surfaces of the larger size bolts and screws after heat treatment.

– Bright finished bolts and screws. This term is used to describe bolts and screws which are finished bright on all surfaces or which have a finish on the hexagon, produced by bright drawing.

– Nuts. These may be bright on all surfaces or dull black when heat-treated.

– Other finishes. If the purchaser requires bolts, screws or nuts of steel (or other material) to be coated, they should state the type of coating required in their enquiry and order and it is recommended that reference be made to BS EN ISO 4042, in this respect.

If steel bolts, screws or nuts are required finished bright all over, the purchaser should state this in their enquiry and order.

Standard: GOST 4543

Steel Grade: 30ХГСА

Chemical Requirements  Composition, max, %

Elements	30ХГСА
Carbon	0.28-0.34
Silicon	0.90-1.20
Manganese	0.80-1.10
Chromium	0.80-1.10
Phosphorus	0.025
Sulfur	0.025
Copper	0.30
Nickel	0.30

 

Tensile, Impact and Hardness Requirements

Steel Grade	30ХГСА
Yield Strength, min, N/mm2	835
Ultimate Strength,min, N/mm2	1080
Elongation, min, %	10
Contraction, min, %	45
Shock viscosity KCU, J/cm2	49
Brinell Hardness Number, max	229

INCONEL® 625 is a nonmagnetic, corrosion and oxidation resistant, nickel-base alloy. It has high strength and toughness in the temperature range cryogenic to 2000°F (1093°C) which is derived largely from the solid solution effects of the refractory metals, columbium and molybdenum, in a nickel-chromium matrix. Alloy 625 has excellent fatigue strength and stress-corrosion cracking resistance to chloride ions.

Typical applications for INCONEL® 625 have included heat shields, furnace hardware, gas turbine engine ducting, combustion liners and spray bars, chemical plant hardware and special seawater applications.

Available forms are seamless pipe, welded pipe, seamless tube, welded tube, bar, wire, sheet, plate, forgings, pipe fittings and flanges.

Chemical Composition  %

Elements	INCONEL® 625 UNS N06625
Nickel	58 min.
Chromium	20.0-23.0
Iron	5.0 max.
Molybdenum	8.0-10.0
Niobium(plus Tantalum)	3.15-4.15
Carbon	0.10 max.
Manganese	0.50 max.
Silicon	0.50 max.
Phosphorus	0.015 max.
Sulfur	0.015 max.
Aluminum	0.40 max.
Titanium	0.40 max.
Cobalta	1.0 max.
a If determined

 

Standard: GOST 4543

Steel Grade: 40X

Chemical Requirements  Composition, max, %

Elements	40X – GOST 4543
Carbon	0.36 – 0.44
Silicon	0.17 – 0.37
Manganese	0.50 – 0.80
Chromium	0.80 – 1.10
Phosphorus	0.035
Sulfur	0.035
Copper	0.30
Nickel	0.30

 

Tensile, Impact and Hardness Requirements

Steel Grade	40X – GOST 4543
Yield Strength, min, N/mm2	785
Ultimate Strength,min, N/mm2	980
Elongation, min, %	10
Contraction, min, %	45
Shock viscosity KCU, J/cm2	59
Brinell Hardness Number, max	217

GOST 4543 Alloyed Construciton Steel

Gost 4543 applies to alloyed construction hot-rolled and forged gauged steel with diameter or thickness up to 250 mm, and steel with a special surface finish, used in a thermally treated condition and produced in the form of bars, strips and hanks. Regarding the standards for chemical composition this Standard applies to all other types of rolled stock, ingots, and forged and punched pieces. The indicators of technological level, established by this Standard, shall be stipulated for premium and first categories of quality. The rolled stock with standardized quality indicators shall be considered as premium category of quality.

Classification 

Depending on chemical composition and properties, structural steel shall be divided into categories:
quality;
high quality-A;
extra high quality-Ш

ASME B16.21 NONMETALLIC FLAT GASKETS FOR PIPE FLANGES

ASME B16.21 covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets. These gaskets are dimensionally suitable for use with flanges described in the referenced flange standards.

Gasket Marking

Gaskets shall be packaged with NPS, Class, gasket manufacturer’s name, material designation, thickness, and ASME B16.21 marked or tagged on the package or gasket. At the option of the manufacturer, the DN designation may be included.

ASME B16.20 METALLIC GASKETS FOR PIPE FLANGES Ring-Joint, Spiral-Wound, and Jacketed

ASME B16.20 covers materials, dimensions, tolerances, and markings for metal ring-joint gaskets, spiral wound metal gaskets,and metal-jacketed gaskets.These gaskets are dimensionally suitable for use with flanges described in reference flange standards ASME B16.5, ASMEB16.47, API Specification 6A, and ISO 10423. This Standard covers spiral-wound metal gaskets and metal jacketed gaskets for use with raised-face and flat-face flanges.

Marking

The outer surface of each gasket shall carry the manufacturer’s name or identification trademark and gasket number prefixed by the letters R, RX, or BX, followed by the gasket material identification. The gasket shall also be marked with an ASMEB16.20 designation. The marking shall be applied so as not to harmfully distort the gasket or affect the integrity of the seal.

Identification Symbol: A182 F60

UNS Designation: S32205

Type: Ferritic – Austenitic Stainless Steel

Heat Treatment: Solution Treat and Quench

 

Chemical Requirements  Composition, max, %

Elements	A182 F60
Carbon	0.030
Manganese	1.50
Phosphorus	0.030
Sulfur	0.020
Silicon	1.00
Nickel	4.5-6.5
Chromium	22.0-23.0
Molybdenum	3.0-3.5
Nitrogen	0.14-0.20

 

Tensile and Hardness Requirements

Grade Symbol	F60
Tensile Strength,min, ksi [Mpa]	95[655]
Yield Strength, min,ksi [MPa]	65[450]
Elongation in 2 in.[50 mm] or 4D,min, %	25
Reduction of Area, min, %	45
Brinell Hardness Number	…