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Movement · TMI (Seiko Instruments) · automatic

Seiko NH35 (TMI) movement

Seiko NH35 (TMI) is an automatic movement by TMI (Seiko Instruments): 27.4 mm1 across, 5.32 mm1 high, 242 jewels, beating at 21,600 bph2, 41 h3 of power reserve. Fitting figures: hand holes hour 1.5 · minute 0.88 · second 0.198 mm; dial feet 1:36, 7:33; date window 3H · 3H, 6H, 9H (full table). 1 watch in our base uses it (list).

Sources checked · How we source numbers
TMI NH35: movement drawingTMI NH35, dial side, to scale: movement diameter 27.4 mm; casing diameter 29.36 mm; stem at 3H; date 3H window 2.9 × 2 mm, centre 10.55 mm from the axis; 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 29.3610.55stem 3Hdate 3H 2.9 × 2centre 10.55 from axisF1 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 NH35, dial sideDrawing from data, not a photo · mm

NH35 at a glance

Diameter
27.4 mm1
Height
5.32 mm1
Jewels
242
Beat rate
21,600 bph2
Power reserve
41 h3
Accuracy
−20 to +40 s/day3
Lift angle
53°3
Do not set the date
21:00–04:004

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

What fits the NH35

The figures a dial, hands or case must match for the NH35, as TMI prints them.

Hand holes
hour 1.5 · minute 0.88 · second 0.198 mm5
Hand height options
type M: H1 hour wheel 0.88 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 · type L: H1 hour wheel 1.28 · 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
3H3 · 3H, 6H, 9H5
Crown
3H3
Stem length
A 11 · B 21.48 mm5
Stem part number
0351 2006

Watches with the NH35

What can replace the NH35

11 calibres of the Seiko NH / 4R / 7S group checked against the NH35: diameter, height, hand holes, date window, crown and dial feet. A verdict marked “not confirmed” lacks one of those figures for the NH35 or the other calibre.

Not published, so not checked in several comparisons:

  • hand holes for 4R35, 4R34, 4R36, NH38, NH39 and NH70
  • crown position for 4R35, 4R34, 4R36, NH38, NH39 and NH70
  • dial feet for 4R35, 4R34, 4R36, NH38, NH39 and NH70

  1. NH35 → 4R35

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

  2. NH35 → NH36

    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.
    • ≠dateNH36 adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.
    • =dateDate window at 3H on both.
    • =crownCrown at 3H on both.
    • =dial feetDial feet in the same places (1:36, 7:33).

  3. NH35 → 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.
    • =dateDate window at 3H on both.

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

  4. NH35 → 4R36

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠date4R36 adds a day wheel: a date-only dial hides it, and the crown gets a day-setting step.
    • =dateDate window at 3H on both.

  5. NH35 → 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.
    • =dateDate window at 3H, same distance from the centre (10.55 mm).
    • =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.

  6. NH35 → NH38

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

  7. NH35 → NH39

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠dateNH39 has no date: a dial with a date window would show nothing in it.

  8. NH35 → NH70

    Fits with changes· not confirmed
    • =diameterSame movement diameter: 27.4 mm.
    • =heightSame height: 5.32 mm.
    • ≠dateNH70 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 NH35

The figures a watchmaker or a timegrapher needs for the NH35, as TMI prints them.

Lift angle
53°3
Accuracy (maker)
−20 to +40 s/day3measured 10-60 min after full wind; dial up / 9 o'clock up / 6 o'clock up; 20 s measurement time
Power reserve
41 h3
Do not set the date
21:00–04:004
Hacking seconds
Yes2
Hand winding
Yes3
  • The 4R35 is the same calibre as the NH35, sold under another name[8](secondary source).

Same family at TMI

How each differs from the NH35, worked out from the figures on its own page.

All NH35 figures

Every figure we hold for the NH35, 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
Power reserve
41 h3
Hands and functions
hours, minutes, centre seconds, date2
Hacking seconds
Yes2
Hand winding
Yes3

Accuracy and care

Accuracy (maker)
−20 to +40 s/day3
Lift angle
53°3
Do not set the date
21:00–04:004

Fitting: dial, hands, stem

Date window
3H3 · 3H, 6H, 9H5
Crown
3H3
Hand holes
hour 1.5 · minute 0.88 · second 0.198 mm5
Hand height options
type M: H1 hour wheel 0.88 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 · type L: H1 hour wheel 1.28 · 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

Versions

NH35A31J · NH35A31M · NH35A31MN · NH35A41J · NH35A41MN[9]

NH35 questions

What dial, hands and case fit the NH35?

TMI lists hand holes hour 1.5 · minute 0.88 · second 0.198 mm; hand height options type M: H1 hour wheel 0.88 · H2 cannon pinion 0.61 · H3 fourth wheel 0.42 · type L: H1 hour wheel 1.28 · 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 · 3H, 6H, 9H. A dial, a set of hands or a case fits the NH35 when it matches these figures.

Source [5][1][3]

Which watches use the NH35?

1 watch in our base name the NH35: Croft Mid-Size Automatic Regiment Blue.

What is the lift angle of the NH35?

53°, as TMI prints it. Enter 53° on a timegrapher to read amplitude correctly for the NH35.

Source [3]

How accurate is the NH35?

TMI rates the NH35 at −20 to +40 s/day, measured under TMI’s own test conditions; a worn NH35 can run outside the −20 to +40 s/day range.

Source [3]

Is the NH35 the same as the 4R35?

Sources describe the NH35 and 4R35 as the same calibre sold under two names. The NH35 page shows TMI’s own figures; the 4R35 page shows Seiko’s.

When should you not change the date on the NH35?

Not between 21:00 and 04:00, per TMI: the NH35’s date change is engaged then, so move its hands past 04:00 before using the quick-set.

Source [4]

More on movements

Sources

Documents checked · Report a wrong number

  1. 1Time Module Ltd. — Watch Movement Specification and Drawing - Standard Mechanical Movement NH35A · pdf · read
  2. 2Time Module Ltd. — Product Line-Up - Mechanical (NH0&NH3); NH34/NH35/NH36 product blocks · html · read
  3. 3Time Module Ltd. — Technical Guide & Parts Catalogue, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) - Automatic Mechanical · pdf · read
  4. 4Time Module Ltd. — Operation Manual, Cal.NH3 Series (NH34A/35A/36A/37A/38A/39A) · pdf · read
  5. 5Time Module Ltd. — Watch Movement Specification and Drawing - NH35A (drawing pages read: Appearance-1, Hand Fitting, Hand Setting Stem, Dial-1, Dial-2, Hands) · pdf · read
  6. 6Time Module Ltd. — Parts List, Cal.NH35A · pdf · read
  7. 7Spinnaker Watches — Croft Mid-Size Automatic — Regiment Blue (SP-5100-22) · html · read
  8. 8Grail Watch — Grail Watch Reference: Seiko Cal. 4R35 · html · read