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  • ASTM
    F879-12 Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws
    Edition: 2012
    $103.58
    Unlimited Users per year

Description of ASTM-F879 2012

ASTM F879 - 12

Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws

Active Standard ASTM F879 | Developed by Subcommittee: F16.04

Book of Standards Volume: 01.08




ASTM F879

Abstract

This specification covers the chemical and mechanical requirements for stainless steel metric hexagon socket button (SBHCS) and flat countersunk (SFHCS) head cap screws with nominal thread M 3 through M 20 intended for use in applications requiring general corrosion resistance. These steels are designated into three classes: Austenitic Class A 1-50 in an annealed condition, Austenitic Class A1-55 in a cold worked condition, and Austenitic Class A 1-70 in a cold worked condition. The austenitic stainless steel socket screw shall be designated F879M A1-50, F879M A1?55, or F 879M A1-70. Screws shall be formed by upsetting or extruding, or both. Also, these screws shall be roll threaded. Austenitic alloys ClassA 1-50 screws, following manufacture, shall be annealed by heating to a certain temperature to obtain maximum corrosion resistance and minimum permeability. The screws shall be held for a sufficient time at temperature, then cooled at a rate sufficient to prevent precipitation of the carbide and provide the properties specified. Different tests shall be conducted in order to determine the following mechanical properties of screws: tensile strength, minimum extension, yield strength, elongation, Vickers hardness, and Rockwell hardness.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification covers the chemical and mechanical requirements for stainless steel inch hexagon socket button (SBHCS) and flat countersunk (SFHCS) head cap screws with nominal thread 0.060 through 0.625 in. intended for use in applications requiring general corrosion resistance.

1.2 Two groups of austenitic stainless steel alloys and three conditions are covered. See Table 1 and Table 2 .

TABLE 1 Mechanical Property Requirements

Alloy Group

Alloy
Condition

Full Size Product Tests A

Machined Specimen Tests

Core Hardness B

Tensile
Strength ksi

Extension C
min

Tensile
Strength ksi

Yield
Strength ksi

Elongation
% min

Vickers

Rockwell

All

AF

85 max

0.6 D

85 max

55 max

40

210 max

95 HRB max

All

CW

80 min

0.4 D

80 min

40 min

25

150 min

50 HRA min

All

CW1

102 min

0.4 D

87 min

65 min

20

220 min

59 HRA min

A Actual full-size testing of condition CW and CW1 may result in decreased tensile strength because of the head configuration (see Table 3 ). For fasteners with nominal thread diameters larger than 0.625 in., the mechanical properties shall be agreed upon between the user and manufacturer.
B Core hardness is only required when full-size product testing cannot be accomplished.
C D denotes nominal thread size.
TABLE 2 Chemical Requirements

Alloy Group

UNS Designation

Alloy

Composition, % maximum except as shown

Carbon

Manganese

Phosphorus

Sulfur

Silicon

Chromium

Nickel

Copper

Molybdeneunm

Austenitic Alloys

1

S30400

304

0.08

2.00

0.045

0.030

1.00

18.0 to 20.0

8.0 to 10.5

1.00

.?.?.

1

S30403

304L

0.030

2.00

0.045

0.030

1.00

18.0 to 20.0

8.0 to 12.0

1.00

.?.?.

1

S30500

305

0.12

2.00

0.045

0.030

1.00

17.0 to 19.0

10.5 to 13.0

1.00

.?.?.

1

S38400

384

0.08

2.00

0.045

0.030

1.00

15.0 to 17.0

17.0 to 19.0

.?.?.

.?.?.

1

S30430

189LW

0.10

2.00

0.045

0.030

1.00

17.0 to 19.0

8.0 to 10.0

3.0 to 4.0

.?.?.

1

S30433

302HQ

0.03

2.00

0.045

0.030

1.00

17.0 to 19.0

8.0 to 10.0

3.0 to 4.0

.?.?.

2

S31600

316

0.08

2.00

0.045

0.030

1.00

16.0 to 18.0

10.0 to 14.0

.?.?.

2.00 to 3.0

2

S31603

316L

0.03

2.00

0.045

0.030

1.00

16.0 to 18.0

10.0 to 14.0

.?.?.

2.00 to 3.0


1.3 Units The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 The following precautionary caveat pertains only to the test method portion, Section 12 , of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

A342/A342M Test Methods for Permeability of Feebly Magnetic Materials

A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems

A555/A555M Specification for General Requirements for Stainless Steel Wire and Wire Rods

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

A967 Specification for Chemical Passivation Treatments for Stainless Steel Parts

D3951 Practice for Commercial Packaging

E18 Test Methods for Rockwell Hardness of Metallic Materials

E92 Test Method for Vickers Hardness of Metallic Materials

E384 Test Method for Knoop and Vickers Hardness of Materials

F593 Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs

F606 Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets

F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series

F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection

ASME Standard

B 18.3 Socket Cap, Shoulder and Set Screws (Inch Series) Available from Global Engineering Documents, 15 Inverness Way, East Englewood, CO 80112-5704, http://www.global.ihs.com.

Keywords

corrosion resistant; stainless steel; socket button head cap screws; socket flat countersunk head cap screws;


ICS Code

ICS Number Code 21.060.10 (Bolts, screws, studs)


DOI: 10.1520/F0879-12

ASTM International is a member of CrossRef.

ASTM F879

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