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Movement · TMI (Seiko Instruments) · automatic

TMI NH36 movement

TMI NH36 is an automatic movement by TMI (Seiko Instruments): 27.4 mm1 across, 5.32 mm1 high, 242 jewels, beating at 21,600 bph2. 2 watches in our base use it (list). Fitting figures: hand holes hour 1.5 · minute 0.88 · second 0.198 mm; dial feet 1:36, 7:33; date window 3H, 6H (full table).

Sources checked · How we source numbers
TMI NH36: movement drawingTMI NH36, dial side, to scale: movement diameter 27.4 mm; casing diameter 29.36 mm; stem at 3H; date 3H window 7 × 2 mm, centre 8.45 mm from the axis; date 6H window (size unknown); dial foot F1 at x 9.67 mm, y 8.67 mm (about 1:36); dial foot F2 at x −9.47 mm, y −8.93 mm (about 7:33); size 12‴; height 5.32 mm; hour hand hole Ø 1.5 mm; minute hand hole Ø 0.88 mm; second hand hole Ø 0.198 mm; dial centre hole Ø 2.05 mm.movement Ø 27.4casing Ø 29.368.45stem 3Hdate 3H 7 × 2centre 8.45 from axisdate 6Hsize —, position onlyF1 1:36x 9.67 y 8.67F2 7:33x −9.47 y −8.9312‴ as printed · Ø 27.4 = 12.15‴5.32SIDE · SECTION · height 5.32Adial hole Ø 2.05hour Ø 1.5minute Ø 0.88second Ø 0.198DETAIL A · 6:1
TMI NH36, dial sideDrawing from data, not a photo · mm

NH36 at a glance

Diameter
27.4 mm1
Height
5.32 mm1
Jewels
242
Beat rate
21,600 bph2
Do not set the date
21:00–04:003

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

Watches with the NH36

What fits the NH36

The figures a dial, hands or case must match for the NH36, as TMI prints them.

Hand holes
hour 1.5 · minute 0.88 · second 0.198 mm5
Hand height options
type M: H1 hour wheel 0.68 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 · type L: H1 hour wheel 1.08 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 mm5
Dial feet
1:36, 7:335 · 1:36, 7:335
Dial centre hole
2.05 mm5
Casing diameter
29.36 mm1
Date window
3H, 6H5
Crown
3H4
Stem length
A 11 · B 21.48 mm5
Stem part number
0351 2006

What can replace the NH36

11 calibres of the Seiko NH / 4R / 7S group checked against the NH36: diameter, height, hand holes, date window, crown and dial feet. A verdict marked “not confirmed” lacks one of those figures for the NH36 or the other calibre.

Not published, so not checked in several comparisons:

  • hand holes for 4R36, 4R35, 4R34, 7S36 and NH38
  • crown position for 4R36, 4R35, 4R34, 7S26, 7S36 and NH38
  • dial feet for 4R36, 4R35, 4R34, 7S26, 7S36 and NH38

  1. NH36 → 4R36

    Drop-in· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • =dateDate window at 3H on both.

  2. NH36 → NH35

    Fits with changes
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • =handsSame hand holes (hour 1.5, minute 0.88, second 0.198 mm): the hands carry over.
    • ≠dateNH35 has no day wheel: a day-date dial would show an empty day window.
    • =dateDate window at 3H on both.
    • =crownCrown at 3H on both.
    • =dial feetDial feet in the same places (1:36, 7:33).

  3. NH36 → 4R35

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠date4R35 has no day wheel: a day-date dial would show an empty day window.
    • =dateDate window at 3H on both.

  4. NH36 → 4R34

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠functions4R34 adds a 24-hour hand: it needs a dial and hand set made for it.
    • ≠date4R34 has no day wheel: a day-date dial would show an empty day window.
    • =dateDate window at 3H on both.

    Not published, so not checked: height for 4R34.

  5. NH36 → 7S26

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • ≠height7S26 is 0.42 mm thinner (4.9 mm vs 5.32 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.
    • ≠handsDifferent hand holes (minute 0.88 vs 0.9 mm): new hands.
    • =dateDate window at 3H on both.

  6. NH36 → 7S36

    Fits with changes· not confirmed
    • ≠diameter7S36 is 0.4 mm narrower (movement diameter 27 mm vs 27.4 mm): it needs a movement ring or holder to sit centred.
    • ≠height7S36 is 0.52 mm thinner (4.8 mm vs 5.32 mm): the dial and hands sit lower, so a spacer or a different stem height may be needed.

    Not published, so not checked: date position for 7S36.

  7. NH36 → NH34

    Fits with changes· not confirmed
    • =diameterSame size in lignes: 12‴.
    • =heightSame height: 5.32 mm.
    • =handsSame hand holes (hour 1.5, minute 0.88, second 0.198 mm): the hands carry over.
    • ≠functionsNH34 adds a 24-hour hand: it needs a dial and hand set made for it.
    • ≠dateNH34 has no day wheel: a day-date dial would show an empty day window.
    • =dateDate window at 3H on both.
    • =crownCrown at 3H on both.
    • =dial feetDial feet in the same places (1:36, 7:33).

    Not published, so not checked: a millimetre diameter for NH34.

  8. NH36 → NH38

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠dateNH38 has no day wheel: a day-date dial would show an empty day window.
    • ≠dateNH38 has no date: a dial with a date window would show nothing in it.

3 more calibres in the group fit less well; compare any of them with the movement comparison.

Setting and servicing the NH36

The figures a watchmaker or a timegrapher needs for the NH36, as TMI prints them.

Do not set the date
21:00–04:003
Hacking seconds
Yes2
Hand winding
Yes4
  • The 4R36 is the same calibre as the NH36, sold under another name[9](secondary source).

Same family at TMI

How each differs from the NH36, worked out from the figures on its own page.

All NH36 figures

Every figure we hold for the NH36, with its source. Where sources disagree, each value is shown.

Size

Size in lignes
12‴2
Diameter
27.4 mm1
Casing diameter
29.36 mm1
Height
5.32 mm1

Running

Jewels
242
Beat rate
21,600 bph2
Hands and functions
hours, minutes, centre seconds, date, day2
Hacking seconds
Yes2
Hand winding
Yes4

Accuracy and care

Do not set the date
21:00–04:003

Fitting: dial, hands, stem

Date window
3H, 6H5
Crown
3H4
Hand holes
hour 1.5 · minute 0.88 · second 0.198 mm5
Hand height options
type M: H1 hour wheel 0.68 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 · type L: H1 hour wheel 1.08 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 mm5
Dial feet
1:36, 7:335 · 1:36, 7:335
Dial centre hole
2.05 mm5
Stem part number
0351 2006
Stem length
A 11 · B 21.48 mm5

Origin

Made in
Japan or Malaysia2

Not published yet

  • Power reserve: not published by TMI
  • Accuracy (maker): not published by TMI
  • Lift angle: not published by TMI

Versions

NH36A311J · NH36A311M · NH36A311MN · NH36A411J · NH36A411MN[10]

NH36 questions

Which watches use the NH36?

2 watches in our base name the NH36: Islander 38mm Automatic Dive Watch ISL-05, Islander Orange Dial Automatic Dive Watch ISL-94.

What dial, hands and case fit the NH36?

TMI lists hand holes hour 1.5 · minute 0.88 · second 0.198 mm; hand height options type M: H1 hour wheel 0.68 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 · type L: H1 hour wheel 1.08 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 mm; dial feet 1:36, 7:33; dial centre hole 2.05 mm; casing diameter 29.36 mm; date window 3H, 6H. A dial, a set of hands or a case fits the NH36 when it matches these figures.

Source [5][1]

When should you not change the date on the NH36?

Not between 21:00 and 04:00, per TMI: the NH36’s date change is engaged then, so move its hands past 04:00 before using the quick-set.

Source [3]

Does the NH36 hack and hand-wind?

Yes, it hacks: the seconds hand stops with the crown pulled out. It can be wound by the crown.

Source [2][4]

Is the NH36 the same as the 4R36?

Sources describe the NH36 and 4R36 as the same calibre sold under two names. The NH36 page shows TMI’s own figures; the 4R36 page shows Seiko’s.

What can replace the NH36?

From the published figures, the closest is the 4R36: drop-in, not confirmed for every part. Same movement diameter: 27.4 mm.

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Time Module Ltd. — Watch Movement Specification and Drawing - Standard Mechanical Movement NH36A · pdf · read
  2. 2Time Module Ltd. — Product Line-Up - Mechanical (NH0&NH3); NH34/NH35/NH36 product blocks · html · read
  3. 3Time Module Ltd. — Operation Manual, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) · pdf · read
  4. 4Time Module Ltd. — Technical Guide & Parts Catalogue, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) - Automatic Mechanical · pdf · read
  5. 5Time Module Ltd. — Watch Movement Specification and Drawing - NH36A (drawing pages read: Hand Fitting, Hand Setting Stem, Dial, Hands) · pdf · read
  6. 6Time Module Ltd. — Parts List, Cal.NH36A · pdf · read
  7. 7Long Island Watch (Islander brand) — Islander 38mm Automatic Dive Watch ISL-05 · html · read
  8. 8Long Island Watch (Islander brand) — Islander Orange Dial Automatic Dive Watch ISL-94 · html · read
  9. 9Grail Watch — Grail Watch Reference: Seiko Cal. 4R36 · html · read