Calipers / Compasses / Dividers
Compasses Steel
Compasses Steel is a group of 16 IMPA-coded items (codes 650211–650226) under Calipers / Compasses / Dividers in the Measuring Tools section (IMPA 65). All of them are priced per pair. Every item in the list is steel. The list runs through 16 metric sizes from 75 mm to 1200 mm.
Buying guide
Steel compasses are marking-out tools: two hardened steel legs with extra-hard tempered points, used to scribe circles and arcs on iron and steel plate. The group lists sixteen sizes from 75 mm to 1200 mm, each ordered by the pair.[1]
In metalwork the points act as scribers. One leg sits in the dimple made by a centre or prick punch, and the other is swung round it to scribe the circle. On board they are used in the workshop to mark out flanges, gaskets, bolt circles, patches and holes before cutting or drilling, and to step off equal spacings.[2]
How to specify it
Pick the size from the largest radius you need to scribe, and give it with the IMPA code. Makers do not all measure the nominal size the same way, so when replacing a worn tool, check with the supplier that the new one opens as far as the old one.
The unit "pair" is one tool: a compass is commonly called a pair of compasses. For circles larger than the biggest compass, a beam compass, with sliding trammels on a beam, is the tool to use. Two-point dividers, spring dividers and calipers are in the neighbouring groups of the same subgroup.[3]
Rules and certificates
COSWP asks for damaged or worn tools to be taken out of use and for cutting edges to be kept sharp and clean. Only a competent person should maintain, repair or dress tools, so blunt or bent compass points are re-ground by someone who knows how, or the compass is replaced. Use a tool so that if it slips it moves away from the body.[4]
Questions buyers ask
- What is the difference between steel compasses and dividers?
- Both have two legs. A dividing compass, or dividers, has two spikes and is used mainly to step off and transfer distances. The marking-out compass in this group has hardened points for scribing circles on steel plate.
- Why are steel compasses sold by the pair?
- Because the tool itself is called a pair of compasses. One "pair" on the order is one compass.
Sources
Published by Sherif Awad, founder of GeoMarineHub — in ship supply since 1990, a family business since 1981 (45 years). Last checked .
At a glance
Part of Measuring Tools (IMPA section 65): Calipers, micrometers, gauges, tapes, levels, thermometers and pressure gauges.
It is one of 9 groups under Calipers / Compasses / Dividers; the others include Calipers Inside, Calipers Lock-joint Transfer Inside, Calipers Lock-joint Transfer Outside, Calipers One-side, Calipers Outside and 3 more.
Post the ones you need as a requirement and verified suppliers activated at your port bid on them — sealed, so nobody sees another bid.
- Items
- 16
- IMPA codes
- 650211–650226
- Priced
- per pair
- Materials
- steel
- Sizes
- 75 mm – 1200 mm
Items
| IMPA | Item | Unit |
|---|---|---|
| 650211 | COMPASS STEEL 75MM | PRS |
| 650212 | COMPASS STEEL 100MM | PRS |
| 650213 | COMPASS STEEL 125MM | PRS |
| 650214 | COMPASS STEEL 150MM | PRS |
| 650215 | COMPASS STEEL 200MM | PRS |
| 650216 | COMPASS STEEL 250MM | PRS |
| 650217 | COMPASS STEEL 300MM | PRS |
| 650218 | COMPASS STEEL 350MM | PRS |
| 650219 | COMPASS STEEL 400MM | PRS |
| 650220 | COMPASS STEEL 450MM | PRS |
| 650221 | COMPASS STEEL 500MM | PRS |
| 650222 | COMPASS STEEL 600MM | PRS |
| 650223 | COMPASS STEEL 750MM | PRS |
| 650224 | COMPASS STEEL 900MM | PRS |
| 650225 | COMPASS STEEL 1000MM | PRS |
| 650226 | COMPASS STEEL 1200MM | PRS |
Also under Calipers / Compasses / Dividers
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