{"id":3910,"date":"2026-09-21T19:44:02","date_gmt":"2026-09-21T19:44:02","guid":{"rendered":"https:\/\/mclements.net\/blogWP\/?p=3910"},"modified":"2026-10-02T13:50:00","modified_gmt":"2026-10-02T13:50:00","slug":"pentel-orenz-nero","status":"publish","type":"post","link":"http:\/\/mclements.net\/blogWP\/index.php\/2026\/09\/21\/pentel-orenz-nero\/","title":{"rendered":"Pentel Orenz Nero"},"content":{"rendered":"

These mechanical pencils<\/a> automatically advance the lead and the nib slides and retracts as you write, to prevent the lead from breaking. This helps with thin leads like 0.3 mm, and it also has a 0.2 mm size. The automatic advance makes writing with these pencils a smooth flowing experience more like a pen, since you don’t have to pause to click the lead until you’ve consumed the entire stick.<\/p>\n

TLDR<\/strong>: to form a car analogy, these pencils are like a vintage classic Triumph or MG. They’re fun to drive with unique road feel. Yet they are also less reliable and require more maintenance, so don’t drive one unless you’re handy with a wrench and enjoy working on your car as much as driving it.<\/p>\n

Here’s how the auto-advance works. The clutch in a mechanical pencil is typically 2 or 3 arms arranged in a circle, trapped inside an outer circular ring. The lead goes through the center of the clutch. When you click the pencil, it pushes the clutch arms forward from the circular ring and they open, which advances the lead. When you release the click, a spring pulls the arms back together, grabbing the lead.<\/p>\n

The Orenz Nero clutch is one-way. When closed (at rest), the clutch prevents the lead from sliding back into the pencil, but it doesn’t prevent the lead from pulling further out. The tip’s sliding nib is spring loaded to the fully extended position. When you write, as the lead wears down the nib slides down with it (against the spring force). When you lift the pencil, the spring-loaded nib jumps forward, pulling the lead forward with it due to friction in the nib barrel, and the fact that the 1-way clutch allows the lead to slip forward even when closed. This relies on the fact that the nib barrel has more friction against the lead, than the one-way clutch does.<\/p>\n

The drawback of this design is its complexity and fragility<\/strong><\/em>. It depends on balancing the friction in the nib barrel, with its spring force, and the clutch spring tension and its arm friction. If any of these gets out of wack the pencil stops working.<\/p>\n

The most common failure is that when you push down to write (even gently), the entire nib retracts into the pencil. In other words, the clutch slips. Either something (a tiny chunk of lead, too much graphite residue\/dust) gets stuck in it preventing it from fully closing, or enough dust\/residue has built up on the clutch teeth that even when closed, the lead can still slip both forward and back. Also, if you re-load a lead stick that has already been pulled through the pencil, it is more likely to slip – a small amount of lead rubbed off when it went through the pencil the first time, and the one-way clutch tolerances are so precise that even that tiny amount is enough to make it slip.<\/p>\n

Either way, the solution is the same: disassemble the pencil and clean it. This is easy, especially if you’re familiar with mechanical pencils. Make sure to blast both nib and clutch with clean compressed air from both sides. Even if it’s not jammed, you need to clear out graphite dust\/residue that will make it slip.<\/p>\n

If you’re in the middle of writing and don’t have time to do this (which happens more often than one would like), there’s a workaround: click the pencil a few times to manually extend the lead a few mm beyond the tip, then break that lead off. This draws a fresh section of the lead stick into the clutch; it often happens that fresh section is not worn and is just a touch thicker so the clutch can grab it.<\/p>\n

Some people say that harder lead (HB or B instead of 2B) reduces clutch slip and makes the pencil more reliable. My experience indicates this is not a complete fix but has some merit. My pencils (both 0.3 and 0.2) experience clutch slip almost as often with HB as with 2B lead – but not quite as often. Also, using high quality lead (such as AIN Stein or Uni NanoDia) does help and is a must, as it reduces the amount of dust\/residue that builds up in the pencil.<\/p>\n

A less common failure symptom is lead in the pencil not feeding into tip. I’ve seen leads stick to the inside walls of the internal plastic feed tube instead of falling into the load port. Even if the feed tube is perfectly clean, this can happen due to static electricity. The solution is to ground and demagnetize the pencil. I’ve had this happen only with the 0.2 mm pencil, because those leads are so thin and light. Thicker leads seem to have enough mass to overcome static cling.<\/p>\n

Mike’s take: The Orenz Nero is more of a mechanical curiosity than a real pencil<\/strong>. Normal daily use becomes frustrating because they are so fragile and unreliable. And they are finicky about lead type and brand, which limits one’s choices. They also waste your valuable lead due to the frequent failures, disassembly and cleaning.<\/p>\n

A better choice is the Pentel Orenz (not the Nero)<\/strong>. It does not automatically advance the lead, and consequently its clutch grabs the lead firmly – no slipping. And it has a sliding nib, which has 3 benefits. First, it fully retracts which protects the fragile nib when not in use. Second, it protects the lead as you write, so even thin leads don’t break. Third, it reduces how often you need to click to advance it – each click gives you about 4mm of lead.<\/p>\n

Another good alternative is the Kuru Toga Advance (or Advance Upgrade)<\/strong>. It’s similar to the Orenz in function and price, with one advantage and one disadvantage. The advantage is that it rotates the lead as you write, keeping it sharp. This makes it comparable to a pencil having one grade thinner lead – 0.5 writes like 0.3, 0.3 writes like 0.2. The disadvantage is that the articulated nib – it rotates as well as slides – requires a slightly greater amount of clearance, which means the tip has some “wiggle”. This makes it less precise. The difference is small yet perceptible.<\/p>\n

Between these two (Orenz vs. Advance) I prefer the Orenz. It has slightly higher build quality, using metal in places where the Advance uses plastic. This also makes it easier to disassemble for cleaning – though both are so reliable you won’t need to do this. The Orenz also has slightly better precision, since the nib has less wiggle. And it has a 0.2 mm size, which gives the ultra-sharp line that the 0.3 Advance has due to its rotation.<\/p>\n","protected":false},"excerpt":{"rendered":"

These mechanical pencils automatically advance the lead and the nib slides and retracts as you write, to prevent the lead from breaking. This helps with thin leads like 0.3 mm, and it also has a 0.2 mm size. The automatic advance makes writing with these pencils a smooth flowing experience more like a pen, since … Continue reading Pentel Orenz Nero<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,2],"tags":[],"class_list":["post-3910","post","type-post","status-publish","format-standard","hentry","category-home","category-tech"],"_links":{"self":[{"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/posts\/3910","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/comments?post=3910"}],"version-history":[{"count":7,"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/posts\/3910\/revisions"}],"predecessor-version":[{"id":3918,"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/posts\/3910\/revisions\/3918"}],"wp:attachment":[{"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/media?parent=3910"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/categories?post=3910"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/mclements.net\/blogWP\/index.php\/wp-json\/wp\/v2\/tags?post=3910"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}