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Starrett 18AA Automatic Center Punch With Adjustable Stroke, 4" Length, 7/16" Diameter

4.6 out of 5 stars 47 customer reviews

Price: $34.40 & FREE Shipping on orders over $49. Details
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Specifications for this item
Brand Name Starrett
Part Number 18AA
UPC 094704908106 , 049659501193
EAN 0049659501193 , 0094704908106
Item Weight 0.16 ounces
Manufacturer Warranty Description One Year on defects in material and workmanship
Number of Items 1
UNSPSC Code 27111505


Frequently Bought Together

  • Starrett 18AA Automatic Center Punch With Adjustable Stroke, 4" Length, 7/16" Diameter
  • +
  • Starrett 18C Automatic Center Punch Heavy-Duty With Adjustable Stroke, 5-1/4" Length, 11/16" Diameter
  • +
  • Starrett 70A Pocket Scriber With Hardened Steel Point, 2-3/8" Point Length, 1/4" Handle Diameter
Total price: $89.44
Buy the selected items together


Product Features

  • Automatic center punch with 4" length and 7/16" diameter punches a starter dimple without the need for a hammer
  • Stroke impact can be adjusted by turning knurled cap
  • Spring tension regulates stroke for uniform dimple size at each setting
  • Hardened and tempered steel components provide wear resistance and strength
  • Point can be removed for replacement or sharpening
  • Adjustable Stroke
  • Steel is hardened and tempered
  • Knurled finger grips for ease of handling

Product Description

Product Description

The Starrett 18AA automatic center punch with adjustable stroke is 4" long with a 7/16" (11 mm) diameter for creating a starter dimple without the need for a hammer. The punch has an adjustable stroke, which can be set by turning the knurled cap and is regulated by spring tension for uniform dimple size at every setting. The punch is made from hardened and tempered steel components that provide wear resistance and strength. It has a round handle that is knurled for grip. The point can be removed for replacement or sharpening.

Center punches make small dimple marks in a workpiece to help guide a drill bit. Manual center punches have a metal shank with a point and are typically tapped with a ball-peen hammer to mark the material. Automatic center punches have an internal spring mechanism that enables them to mark the material without using a hammer, leaving one hand free for steadying the work.

The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.

From the Manufacturer

These punches are universally used and are well-proportioned for ease of use

Product Details

  • Product Dimensions: 1 x 0.7 x 4.1 inches ; 0.2 ounces
  • Shipping Weight: 0.2 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B0006J4Q5U
  • Item model number: 18AA
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (47 customer reviews)
  • Amazon Best Sellers Rank: #7,934 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
As with most Starrett instruments, the build quality is amazing. The knurling, the ground surfaces, super cool. Got this punch for its size, both frame and light spring. Works wonders on aluminum, but beware spring force for heavier metals maybe a little weak. 5 stars for the product. 1 star for Amazon posting a picture of a replaceable(screw off) tip model, mine has a standard tip(one piece from punching tip to intermediate pin landing), not screw off tip.
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Verified Purchase
This, the 18AA is a little brother to the 18A. Keep in mind that the 18AA has no replaceable tips which can be a good thing as its more rugged. I use auto center punches for aviation rivet removal so they are heavily abused. Starrett auto center punches have never misfired even once for me. Bypass the red punches from the tool truck they are junk compared to a Starrett!
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By CrazyApe on October 21, 2011
Starrett's center punches are the best I've ever used. Minus one star for showing a picture of the 18A with the removable tip. The tool I received did not have the threaded removable tip. Just as well... the tips loosen and the threaded part breaks. The point is still technically removable, you just have to disassemble the tool.
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By J-Dub on September 18, 2013
Verified Purchase
It's well made, very powerful and probably the best one available. Highly recommended and I've used it on brass, steel (cold rolled, forged) billet aluminum, cast iron and titanium.
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Verified Purchase
This gets a solid five stars because it really is perfect. The "wind up" is very, very smooth with a nice and short throw, which helps keep it on the spot while pressing on it. The resulting action is quick, firm, and surprisingly powerful considering how effortless the "wind up" is. It makes me wonder if they are somehow cheating the conservation of momentum and energy... Oh yeah and the knurling and overall look is second to none. It feels super sweet to hold! Given all of this, plus the fact that it only costs as much as 6 lattes, plus the fact that it's still made in the USA, don't even bother to waste your money on a cheaper import (which are only cheaper by about 1/2 as much - we're still in the "impulse dollars" range here folks...).
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Verified Purchase
Excellent product. Smooth action and adjusts and works flawlessly. Plus it has that "fine Starrett feel".... In the tool world you get what you pay for and this automatic center punch by Starrett a good example of that. A great tool and value.
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Verified Purchase
As one expects from Starrett, superb quality. I have no doubt that this tool will last for many years, as my last one did before it was lost. If you are considering an automatic center punch, don't bother looking beyond this brand - Starrett is the one that I recommend. Great quality and function!
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Verified Purchase
I purchased this punch with the anticipation that it would work as well as the older style Starrett 18AA punches that my co-workers have been using for years. I must say that I'm thoroughly disappointed. It simply doesn't punch consistently. I'm lucky to get it to punch twice in a row without jiggling the tip or taking it apart. It doesn't reload itself to punch, which is unacceptable when I'm trying to punch several times in a row to prep a panel for drilling. While it may be a defective unit, I have my doubts because it's design is the same as the cheap box store one I replaced it with that has the exact same problem.

All in all, the design has changed from what seemed to be a reliable quality tool to one that is inconsistent at best.
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