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Movement · Miyota (Citizen) · automatic

Miyota 8315 movement

Miyota 8315 is an automatic movement by Miyota (Citizen): 11½‴1 in size, 5.67 mm2 high, 212 jewels, beating at 21,600 bph2, 60 h2 of power reserve.

Sources checked · How we source numbers
Miyota 8315: movement drawingMiyota 8315, dial side, to scale: movement diameter — (unknown); size 11½‴; height 5.67 mm; hour, minute, second hand hole Ø — (unknown).movement Ø —11½‴ as printed5.67SIDE · SECTION · height 5.67Ahour, minute, second hand hole Ø —DETAIL A · 10:1
Miyota 8315, dial sideDrawing from data, not a photo · mm

Miyota 8315 at a glance

Diameter
11½‴1
Height
5.67 mm2
Jewels
212
Beat rate
21,600 bph2
Power reserve
60 h2
Lift angle
49°2
Do not set the date
21:00–01:002

New to the terms? Read quartz vs automatic or watch movement types.

Setting and servicing the Miyota 8315

The figures a watchmaker or a timegrapher needs for the Miyota 8315, as Miyota prints them.

Lift angle
49°2
Positional difference
50 s/day2
Power reserve
60 h2
Do not set the date
21:00–01:002
Hand winding
Yes2
Crown turns to full wind
512

What fits the Miyota 8315

The figures a dial, hands or case must match for the Miyota 8315, as Miyota prints them.

Stem part number
065-2122

Same family at Miyota

How each differs from the Miyota 8315, worked out from the figures on its own page.

What can replace the Miyota 8315

7 calibres of the Miyota 82xx group checked against the Miyota 8315: diameter, height, hand holes, date window, crown and dial feet. A verdict marked “not confirmed” lacks one of those figures for the Miyota 8315 or the other calibre.

Not published, so not checked in several comparisons:

  • a millimetre diameter for Miyota 8315
  • hand holes for Miyota 8315, Miyota 8215, Miyota 8205, Miyota 821A, Miyota 82S0, Miyota 82S5, Miyota 82S7 and Miyota 8N24
  • date position for Miyota 8315 and Miyota 821A
  • crown position for Miyota 8315, Miyota 821A, Miyota 82S0, Miyota 82S5, Miyota 82S7 and Miyota 8N24
  • dial feet for Miyota 8315, Miyota 8205, Miyota 821A, Miyota 82S0, Miyota 82S5, Miyota 82S7 and Miyota 8N24

  1. Miyota 8315 → Miyota 8215

    Drop-in· not confirmed
    • =diameterSame size in lignes: 11½‴.
    • =heightSame height: 5.67 mm.

  2. Miyota 8315 → Miyota 8205

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 11½‴.
    • =heightSame height: 5.67 mm.
    • ≠dateMiyota 8205 adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.

  3. Miyota 8315 → Miyota 821A

    Fits with changes· not confirmed
    • ?diameterDiameter not published for both: the case seat cannot be checked.
    • =heightSame height: 5.67 mm.
    • ≠dateMiyota 821A adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.

    Not published, so not checked: diameter for Miyota 821A.

  4. Miyota 8315 → Miyota 82S0

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 11½‴.
    • =heightSame height: 5.67 mm.
    • ≠dateMiyota 82S0 has no date: a dial with a date window would show nothing in it.

  5. Miyota 8315 → Miyota 82S5

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 11½‴.
    • =heightSame height: 5.67 mm.
    • ≠functionsMiyota 82S5 adds a small seconds: it needs a dial and hand set made for it.
    • ≠dateMiyota 82S5 has no date: a dial with a date window would show nothing in it.

  6. Miyota 8315 → Miyota 82S7

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 11½‴.
    • =heightSame height: 5.67 mm.
    • ≠functionsMiyota 82S7 adds a small seconds: it needs a dial and hand set made for it.
    • ≠dateMiyota 82S7 has no date: a dial with a date window would show nothing in it.

  7. Miyota 8315 → Miyota 8N24

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 11½‴.
    • ≠heightMiyota 8N24 is 0.12 mm thinner (5.55 mm vs 5.67 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.
    • ≠dateMiyota 8N24 has no date: a dial with a date window would show nothing in it.

All Miyota 8315 figures

Every figure we hold for the Miyota 8315, with its source. Where sources disagree, each value is shown.

Size

Size in lignes
11½‴1
Height
5.67 mm2

Running

Jewels
212
Beat rate
21,600 bph2
Power reserve
60 h2
Hands and functions
date1
Hand winding
Yes2
Crown turns to full wind
512

Accuracy and care

Positional difference
50 s/day2
Lift angle
49°2
Do not set the date
21:00–01:002

Fitting: dial, hands, stem

Stem part number
065-2122
Movement holder part
500-7102
Dial screw part
929-6102

Not published yet

  • Accuracy (maker): not in the documents we read
  • Hand holes: only in Miyota’s drawing; not read yet
  • Dial feet: not in the documents we read

Miyota 8315 questions

What is the lift angle of the Miyota 8315?

49°, as Miyota prints it. Enter 49° on a timegrapher to read amplitude correctly for the Miyota 8315.

Source [2]

How long does the Miyota 8315 run when fully wound?

About 60 h from a full wind, per Miyota; a full hand wind takes about 51 crown turns.

Source [2][1]

When should you not change the date on the Miyota 8315?

Not between 21:00 and 01:00, per Miyota: the Miyota 8315’s date change is engaged then, so move its hands past 01:00 before using the quick-set.

Source [2][3]

Does the Miyota 8315 hack and hand-wind?

Hacking is not stated. It can be wound by the crown.

Source [2]

What can replace the Miyota 8315?

From the published figures, the closest is the Miyota 8215: drop-in, not confirmed for every part. Same size in lignes: 11½‴.

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Citizen Watch Co., Ltd. (MIYOTA) — MIYOTA movement overview (catalogue table, 2 pages) · pdf · read
  2. 2Citizen Watch Co., Ltd. (MIYOTA) — Spec. sheet (8315) · pdf · read
  3. 3Citizen Watch Co., Ltd. (MIYOTA) — Instruction manual (8315) · pdf · read