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Casio watch · digital module

Casio A158W strap size (18 mm) and manual

The Casio A158W takes an 18 mm strap: its lug width is 18 mm, so 18 mm spring bars. The case is 33.2 mm wide, 36.8 mm long (case length L, not lug to lug), and 8.2 mm thick. Strap length for your wrist: the strap size tool. Manual: Casio operation guide 593 (PDF) ↗.

Sources checked · How we source numbers
Width (W)
33.2 mm1
Case length (L)
36.8 mm1
not lug to lug
Thickness
8.2 mm1
Lug width
18 mm3
Casio A158W: size drawingCasio A158W, rect case, top and side view to scale: case width 33.2 mm, case length (Casio L) 36.8 mm, lug width 18 mm, thickness 8.2 mm. Bezel, dial and crown size are schematic.lug width 18width 33.2case length (Casio L) 36.8TOPthickness 8.2SIDE
Casio A158W, top and side, to scaleDrawing from data, not a photo · mm

Casio A158W strap size

Lug width 18 mm3seller listing: an 18 mm strap with 18 mm spring bars fits between the lugs. 8 other models take 18 mm.

Attachment: spring bar5seller listing.

Find your strap length in the watch strap size tool, with the Casio A158W filled in.

18 mm strap: strap diagramTwo-piece strap laid flat (18 mm strap). Lug width 18 mm. Short piece — (unknown), long piece — (unknown). Buckle, keepers and holes are schematic.short —long —lug 18lug 18strap length —18 mm strap
18 mm at the lugs; lengths depend on your wristDrawing from data, not a photo · mm

Module 593 twins

Casio's manual list puts 13 model codes on this module: same functions, same manual, often the same battery.

Codes of the Casio A158W family[6]A158WA, A158WEA, A158WEGV, A158WETB, A158WETG

Other families on it with a page here

1 more codes on the same module

A171WE

Casio module 593: functions, battery and manual

Module: Casio module 593

The Casio A158W runs on the Casio module 593, a digital module. 2 other models in our base use it.

Power source
battery2
Battery life
7 years2
Accuracy
±30 s/month2

Battery

Casio A158W specifications

Case width (W)
33.2 mm1
Lug to lug
not published by Casio; see case length (L)
Case length (L)
36.8 mm1Casio's L of L × W × H, measured differently from lug to lug; we never swap one for the other.
Thickness (H)
8.2 mm1
Lug width
18 mm3seller listing18 mm watches
Weight
46 g1
Crystal
Resin Glass1
Water resistance
Water Resistant1
Module
Casio module 5936 · digital moduleCasio module 593 specs
Battery
Accuracy
±30 s/month1
Years made
start not published
Case code
not used by Casio: the module number (module 593) identifies the watch
Strap attachment
spring bar5seller listing

On your wrist

The verdict compares the case length (L) with the flat top of your wrist. Balanced from ~13 cm, past the edges below ~11.5 cm.

= 6.7 in

Compact on a 17 cm wrist: the 36.8 mm case length (L) covers 67% of an estimated 54.8 mm flat top.

Casio publishes no lug-to-lug for this model, so the verdict uses its case length (L). The strap or bracelet joins inside that length, which makes this a cautious estimate.

Flat top = circumference ÷ 3.1, a community convention, not a measurement of your arm. Compact ≤ 0.75 of the flat top, balanced ≤ 0.89, at the edge ≤ 1. Compare more watches in the watch size calculator.

Casio A158W: wrist fitCasio A158W on a wrist, top view to scale. case length (Casio L) 36.8 mm. Wrist 170 mm, estimated flat width 54.8 mm (circumference / 3.1). Ratio 0.67: compact.wrist, flat topwrist flat ≈ 54.8case length (Casio L) 36.8Compact · 36.8 / 54.8 = 0.67estimate: wrist 170 / 3.1 = 54.8 flatcompactbalancededgeoverhang0.750.891
Casio A158W on a 17 cm wristDrawing from data, not a photo · mm

Actual size on your screen

Calibrate once with a bank card and the drawing shows the Casio A158W at 1:1, next to a millimetre ruler.

1:1 · not calibrated: sizes are approximate
Casio A158W: size drawingCasio A158W, rect case, top and side view to scale: case width 33.2 mm, case length (Casio L) 36.8 mm, lug width 18 mm, thickness 8.2 mm. Bezel, dial and crown size are schematic.lug width 18width 33.2case length (Casio L) 36.8TOPthickness 8.2SIDE
Drawing from data, not a photo · mm
01020304050

Same size as the Casio A158W

The models nearest to the Casio A158W in case width and case length (L), drawn over it to scale; below, every model within 1 mm of its 36.8 mm.

Size comparison: Casio A158W, Casio LW-200, Casio A700W, Casio F-91WTop-view outlines to scale on one centre. A Casio A158W: W 33.2, L 36.8, lug 18, T 8.2. B Casio LW-200: Ø 34.9, L 37.9, lug —, T 11.9 (vs A: W +1.7 L +1.1 T +3.7). C Casio A700W: Ø 35.5, L 37.4, lug 18, T 6 (vs A: W +2.3 L +0.6 lug 0 T −2.2). D Casio F-91W: W 35.2, L 38.2, lug 18, T 8.5 (vs A: W +2 L +1.4 lug 0 T +0.3).A W 33.2B Ø 34.9D W 35.2C Ø 35.5A L 36.8C L 37.4B L 37.9D L 38.2A Casio A158WW 33.2 · L 36.8 · lug 18 · T 8.2B Casio LW-200Ø 34.9 · L 37.9 · lug — · T 11.9vs A: W +1.7 L +1.1 T +3.7C Casio A700WØ 35.5 · L 37.4 · lug 18 · T 6vs A: W +2.3 L +0.6 lug 0 T −2.2D Casio F-91WW 35.2 · L 38.2 · lug 18 · T 8.5vs A: W +2 L +1.4 lug 0 T +0.3
A Casio A158W and the 3 nearest in size, on one centre, to scaleDrawing from data, not a photo · mm

Nearest in size

  1. ACasio A158Wthis watch
  2. BCasio LW-200W +1.7 · L +1.1 · T +3.7 mm
  3. CCasio A700WW +2.3 · L +0.6 · T −2.2 mm
  4. DCasio F-91WW +2 · L +1.4 · T +0.3 mm

Differences against A in mm: W case width, L Casio case length, T thickness. Nearest by width and length together, from the published sizes.

Same movement: Casio module 593

Casio A158W questions

What strap size does the Casio A158W take?

The Casio A158W measures 18 mm between the lugs, so it takes an 18 mm strap with 18 mm spring bars. 8 other models in our base share that width.

Find the strap length for your wrist and the Casio A158W in the watch strap size tool.

Where is the manual for the Casio A158W?

The Casio A158W runs Casio module 593, and Casio publishes the operation guide for that module as a PDF: Casio operation guide 593. The module number is stamped on the case back. All of the module’s models and its battery are on its page.

How big is the Casio A158W?

The Casio A158W measures 33.2 mm wide, 36.8 mm long (Casio's L, not lug to lug), 8.2 mm thick, 46 g.

Will the Casio A158W fit a 5.5-inch wrist?

Balanced: the Casio A158W's 36.8 mm case length (L) takes 82% of the ~45.1 mm flat top of a 5.5-inch (14.0 cm) wrist. By the same estimate (circumference ÷ 3.1) it sits balanced from about 13 cm and overhangs the flat top on wrists under about 11.5 cm.

What battery does the Casio A158W take?

The Casio A158W takes CR2016, rated about 7 years.

What module is in the Casio A158W?

The Casio A158W runs on the Casio module 593, a digital module. Casio's manual list puts 13 model codes on this module, 5 of them A158W codes.

More Casio watches

Sources

Documents checked · Report a wrong number

  1. 1Casio America — A158WA-1 | Casio Vintage Watch in Silver Metal | Casio (product page) · html · read
  2. 2Casio Computer Co., Ltd. — Operation Guide 10B+7L(Ver.C), manual for module 593 (qw593_EN.pdf) · pdf · read
  3. 3eBay (third-party seller listing) — Casio A158W Digital Watch Resin Band 7Y Battery · html · read
  4. 4Jamtangan.com — Casio General A158WA-1DF Digital Dial Stainless Steel · html · read
  5. 5StrapHabit — Casio F91W vs. A158 Watch Review. What's the Difference? · html · read
  6. 6Casio Computer Co., Ltd. — Watch manual search JSON (US locale), manual_search.support.json · json · read