BS EN ISO 898-1:2013

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Mechanical properties of fasteners made of carbon steel and alloy steel – Bolts, screws and studs with specified property classes. Coarse thread and fine pitch thread

Published By	Publication Date	Number of Pages
BSI	2013	66

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Description

This part of ISO 898 specifies mechanical and physical properties of bolts, screws and studs made of carbon steel and alloy steel when tested at an ambient temperature range of 10 °C to 35 °C. Fasteners (the term used when bolts, screws and studs are considered all together) that conform to the requirements of this part of ISO 898 are evaluated at that ambient temperature range. They might not retain the specified mechanical and physical properties at elevated temperatures (see Annex B) and/or lower temperatures.

NOTE 1 Fasteners conforming to the requirements of this part of ISO 898 are used in applications ranging from −50 °C to +150 °C. Users are advised to consult an experienced fastener metallurgist for temperatures outside the range of −50 °C to +150 °C and up to a maximum temperature of +300 °C when determining appropriate choices for a given application.

NOTE 2 Information for the selection and application of steels for use at lower and elevated temperatures is given, for example, in EN 10269, ASTM F2281 and in ASTM A320/A320M.

Certain bolts and screws might not fulfil the tensile or torsional requirements of this part of ISO 898 because the geometry of their heads reduces the shear area in the head compared to the stress area in the thread. These include bolts and screws having a low or countersunk head (see 8.2).

This part of ISO 898 is applicable to bolts, screws and studs

made of carbon steel or alloy steel,
having triangular ISO metric screw thread in accordance with ISO 68-1,
with coarse pitch thread M1,6 to M39, and fine pitch thread M8×1 to M39×3,
with diameter/pitch combinations in accordance with ISO 261 and ISO 262, and
having thread tolerances in accordance with ISO 965-1, ISO 965-2 and ISO 965-4.

It is not applicable to set screws and similar threaded fasteners not under tensile stress (see ISO 898-5).

It does not specify requirements for such properties as

weldability,
corrosion resistance,
resistance to shear stress,
torque/clamp force performance (for test method, see ISO 16047), or
fatigue resistance.

PDF Catalog

PDF Pages	PDF Title
7	Scope
8	Normative references
9	Terms and definitions
10	Symbols and abbreviated terms
12	Designation system for property classes Materials
14	Mechanical and physical properties
18	Applicability of test methods General Loadability of fasteners Fasteners with full loadability Fasteners which, due to their geometry, have reduced loadabi
19	Manufacturer’s test/inspection Supplier’s test/inspection Purchaser’s test/inspection
20	Feasible tests for groups of fasteners and machined test pie General Applicability Delivery of test results
27	Test methods Tensile test under wedge loading of finished bolts and screw General Applicability Apparatus Testing device
30	Test procedure Test results Determination of tensile strength, Rm Method Requirements
31	Determination of integrity of transition section between hea Tensile test for finished bolts, screws and studs for determ General Applicability Apparatus
32	Testing device Test procedure
33	Test results Method Requirements Tensile test for full-size bolts, screws and studs for deter General Applicability
34	Apparatus Testing device Test procedure
35	Test results Determination of the elongation after fracture, Af Method Requirements
36	Determination of the stress at 0,0048d non-proportional elon Method Requirements
37	Tensile test for bolts and screws with reduced loadability d General Applicability Apparatus Testing device Test procedure Test results — Requirements
38	Tensile test for fasteners with waisted shank General Applicability Apparatus Testing device Test procedure
39	Test results Method Requirements Proof load test for finished bolts, screws and studs General Applicability Apparatus
40	Testing device
41	Test procedure Test results — Requirements Tensile test for machined test pieces General
42	Applicability Apparatus Testing device Machined test pieces
43	Test procedure Test results Method
44	Requirements Head soundness test General Applicability Testing device
45	Test procedure Test results — Requirements Hardness test General
46	Applicability Test methods Test procedure General Hardness determined on a transverse section through the thre
47	Hardness determined on a surface Test load for hardness determination Requirements Decarburization test General
48	Microscopic method Applicability Preparation of test specimen Test procedure
49	Requirements Hardness method Applicability Preparation of test specimen Test procedure
50	Requirements Carburization test General
51	Hardness test on a longitudinal section Applicability Preparation of the test specimen Test procedure Requirements Surface hardness method Applicability Preparation of test specimen
52	Test procedure Requirements Retempering test General Applicability Test procedure Requirements Torsional test General
53	Applicability Apparatus and testing device Test procedure Test results Method Requirements Impact test for machined test pieces General
54	Applicability Apparatus and testing device Machined test piece Test procedure Requirements Surface discontinuity inspection Marking General
55	Manufacturer’s identification mark Marking and identification of fasteners with full loadabilit General Marking symbols for property classes
56	Identification Hexagon and hexalobular head bolts and screws Hexagon and hexalobular socket head cap screws
57	Cup head square neck bolts Studs
58	Other types of bolts and screws Marking of bolts and screws with left-hand thread
59	Marking and identification of fasteners with reduced loadabi General Marking symbols for fasteners with reduced loadability Marking of packages

Additional information

Status	Revision Underway
Pages	66
Publication Date	2013-01-31
ISBN	978 0 580 76901 6
Standard Number	BS EN ISO 898-1:2013
Title	Mechanical properties of fasteners made of carbon steel and alloy steel – Bolts, screws and studs with specified property classes. Coarse thread and fine pitch thread
Identical National Standard Of	ISO 898-1:2013, EN ISO 898-1:2013
Replaces	BS EN ISO 898-1:2009
Descriptors	Tensile testing, Marking, Temperature, Alloy steels, Hardness testing, Test specimens, Decarburization, Thread pitch, Fasteners, Yield stress, Dimensions, Steels, Physical properties of materials, Screws (bolts), Tensile strength, Specimen preparation, Hardness, Bolts, Testing conditions, Unalloyed steels, Approval testing, Dimensional changes, Surface properties, External-thread fasteners, Compositional tolerances, Elongation at fracture, Tempering, Angles (geometry), Designations, Impact testing, Symbols, Mechanical testing, Chemical composition, Test equipment, Mechanical properties of materials, Studs (fasteners), Proof loading
Publisher	BSI
Committee	FME/9
ICS Codes	21.060.10 - Bolts, screws, studs

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BS EN ISO 898-1:2013

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