Seeh

(Used only in technical illustrations)

-én

\

Used on eng

neerina

drawings)

I

Fig. 18/15 Conventional representation of screw threads

Geometric Tolerances SlotGeometric Tolerances SlotGeometric Tolerances Slot

There are further designations concerned with the tolerances, or accuracy of manufacture, but theee are beyond the ecope of this book.

1ST ANCLE PROJECTION BOLT HEADS

n7

R

. j>__

0

SCREW HEADS COUNTERSUNK

SCREW HEADS COUNTERSUNK

Drawing And Oblique Ellipse

ROUND lie.

HEXAGON SLOTTED GRUB SCREW

SCREWDRIVER SLOT GRUB SCREW (ALLEN SCREW)

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