ISO 1793:2005

INTERNATIONAL ISO
STANDARD 1793
Second edition
2005-01-15
Cinematography — Reels for 16 mm
motion-picture projectors (up to and
including 610 m capacity: 38 cm size) —
Dimensions
Cinématographie — Bobines de projection pour film cinématographique
16 mm (capacité maximale: 610 m pour le format 38 cm) — Dimensions

Reference number
©
ISO 2005
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Foreword
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Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
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ISO 1793 was prepared by Technical Committee ISO/TC 36, Cinematography.
This second edition cancels and replaces the first edition (ISO 1793:1975), which has been technically revised.
Introduction
This edition of ISO 1793 provides for large capacity reels from 60 m to 610 m. The first edition (1975) had reel
capacity of 15 m to 120 m.
iv © ISO 2005 – All rights reserved

INTERNATIONAL STANDARD ISO 1793:2005(E)

Cinematography — Reels for 16 mm motion-picture projectors
(up to and including 610 m capacity: 38 cm size) — Dimensions
1 Scope
This International Standard specifies the dimensions and characteristics of 16 mm motion-picture film
projection reels.
2 Dimensions
2.1 The dimensions shall be as shown in the figures and given in the tables.
2.2 The tip of the keyway, if rounded as shown in Figure 2, may have a minimum radius V/2, if instead, the
tip of the keyway is made square as illustrated by the chain line, the square tip still shall observe the limits
of U.
2.3 The outer surface of the flanges shall be flat out to a diameter of at least 31,75 mm (1,250 in).
Dimension J is the thickness of the reel over the area described by this diameter.
2.4 Rivets or other fastening members shall not extend beyond the outside surfaces of the flanges more
than 0,8 mm (0,03 in) and shall not extend beyond the overall thickness indicated by dimension C.
2.5 Except at embossings, rolled edges and rounded corners, the limits shown shall not be exceeded at the
periphery of the flanges, nor at any other distance from the centre of the reel.
2.6 If spring fingers are used to engage the edges of the film, dimension F shall be measured between the
fingers when they are pressed outward to the limit of their operating range.
2.7 Eccentricity of the flanges and hub with respect to the spindle hole axis shall not exceed the total
variation shown in Table 2.
2.8 Lateral runout shall be measured with respect to the common axis established by the round and square
holes.
3 Characteristics
3.1 Each flange, preferably, shall have a square spindle hole with dimension as illustrated; alternatively,
one flange may have a round spindle hole with a diameter of D (and no keyway).
3.2 If square spindle hole with corner keyways are used in each flange,
...