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BSI
BS A 297:1987

BS A 297:1987

Current

Current

The latest, up-to-date edition.

Specification for internal drive, offset cruciform recess (Torq-Set(R)) for rotary fastening devices. Metric series

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-03-1987

Publisher

British Standards Institution

National foreword
Committees responsible
Specification
0 Introduction
1 Scope
2 Field of application
3 References
4 Definitions
5 Characteristics
6 Designation
Tables
1 Recess - General dimensions
2 Recess dimensions applicable to 100 degree
   countersunk normal and reduced head
3 Recess dimensions applicable to normal flat top pan
   head
4 Recess gauge - Dimensions
5 Recess penetration gauge - Dimensions
6 Driver - Dimensions
Figures
1 Recess - Configuration
2 Recess in 100 degree countersunk head
3 Recess in normal flat top pan head
4 Recess gauge - Configuration
5 Recess penetration gauge - Configuration
6 Driver - Configuration

Specifies maximum and minimum dimensional requirements for rotary fastening devices, and for associated drivers and gauges, for metric design.

This International Standard specifies maximum and minimum dimensional requirements for an internal drive recess configuration for rotary fastening devices, and for the associated drivers and gauges, for metric design. The combinations suggested herein are provided for metric shank diameters.

Committee
ACE/12
DevelopmentNote
Also numbered as ISO 7994 Supersedes 83/78424 DC (11/2005)
DocumentType
Standard
Pages
12
PublisherName
British Standards Institution
Status
Current

BS EN 3037:1997 Screws, pan head, offset cruciform recess, close tolerance normal shank, short thread, in titanium alloy, anodized, MoS<sub>2</sub> lubricated. Classification: 1100 MPa (at ambient temperature)/315°C
BS EN 2886:1996 Screws, pan head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification. 900 MPa (at ambient temperature)/235°C
BS EN 2939:1994 Screws, 100° countersunk head, offset cruciform recess, threaded to head in heat resisting steel FE-PA92HT (A286). Classification: 900 MPa (at ambient temperature)/650°C
BS EN 3381:1997 Screws, 100° countersunk normal head, offset cruciform recess, close tolerance normal shank, short thread, in titanium, anodized, MoS<sub>2</sub> lubricated. Classification: 1100 MPa (at ambient temperature) /315°C
BS EN 3304:1997 Screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in titanium alloy, anodized, MoS<sub>2</sub> lubricated. Classification: 1100 MPa (at ambient temperature)/315°C
BS EN 3759:1997 Screws, pan head, offset cruciform recess, threaded to head, in heat and corrosion resisting steel, passivated. Classification: 1100 MPa (at ambient temperature)/425°C
BS EN 2885:1996 Screws, pan head, offset cruciform recess, coarse tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification: 900 MPa (at ambient temperature)/235°C
BS EN 3307:1997 Screws, pan head, offset cruciform recess, threaded to head, in titanium alloy, anodized, MoS<sub>2</sub> lubricated. Classification: 1100 MPa (at ambient temperature)/315°C
BS EN 2897:1996 Screws, pan head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification: 1100 MPa (at ambient temperature) /235°C
BS EN 2884:1996 Screws, pan head, offset cruciform recess, coarse tolerance normal shank, short thread, in titanium alloy, anodized MoS<sub>2</sub> lubricated. Classification: 1100 MPa (at ambient temperature)/315°C
BS EN 3038:1997 Screws, pan head, offset cruciform recess, close tolerance normal shank, short thread, in heat and corrosion resisting steel, passivated. Classification: 1100 MPa (at ambient temperature)/425°C
BS EN 3035:1997 Screws, 100° countersunk normal head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification: 1100 MPa (at ambient temperature)/235°C
BS EN 3306:1996 Screws, 100° countersunk normal head, offset cruciform recess, threaded to head, in titanium alloy, anodized, MoS<sub>2</sub> lubricated. Classification. 1100 MPa (at ambient temperature)/315°C
BS EN 3760:1997 Screws, 100° countersunk normal head, offset cruciform recess, threaded to head, in heat and corrosion resisting steel, passivated. Classification: 1100 MPa (at ambient temperature)/425°C
BS EN 2940:1996 Screws, 100° countersunk head, offset cruciform recess, threaded to head, in heat resisting steel FE-PA92HT (A 286), silver plated. Classification: 900MPa (at ambient temperature)/650°C
BS EN 3305:1997 Screws, 100° countersunk reduced head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated. Classification: 1100 MPa (at ambient temperature)/235°C
BS EN 3543:1997 Screws, 100° countersunk normal head, offset cruciform recess, close tolerance normal shank, short thread, in heat and corrosion resisting steel, passivated. Classification: 1100 MPa (at ambient temperature)/425°C

BS 308-3:1972 Engineering drawing practice. Geometrical tolerancing

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