TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

FACE BREECH-BLOCK [3 records]

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Alphabetical list of terms

Record 1 2001-11-21

English

Subject field(s)
  • Small Arms
  • Guns (Land Forces)
Key term(s)
  • face of a breech block
  • face of a breechblock

French

Domaine(s)
  • Armes légères
  • Canons (Forces terrestres)
CONT

tranche antérieure du bloc-culasse; tranche postérieure du bloc-culasse.

Spanish

Save record 1

Record 2 2000-08-03

English

Subject field(s)
  • Weapon Systems

French

Domaine(s)
  • Systèmes d'armes

Spanish

Save record 2

Record 3 1988-12-22

English

Subject field(s)
  • Joining Elements (Mechanical Components)
DEF

A screw thread whose forward face is perpendicular to the screw axis and whose back face is at an angle to the axis, so that the thread is both efficient in transmitting power and strong.

CONT

The buttress or breech-block thread is designed for transmitting an exceptionally high pressure in one direction only. In its original form the pressure flank was perpendicular to the thread axis, and the trailing flank sloped at 45°. To simplify the cutting of the face, modern practice is to give the pressure flank a 7° slope. This form of thread is applicable for assembled tubular members because of the small radial thrust. Buttress threads are used on breech mechanisms of large guns and for airplane propeller hubs.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
CONT

[...] le filet en dents de scie ou "butée" peut supporter une charge dans une seule direction, en s'appuyant sur la surface perpendiculaire à l'axe.

Spanish

Save record 3

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© Public Services and Procurement Canada, 2025
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
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