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Sunnen's AG-300 Precision Gauge from Goodson

AG-300 | Sunnen Pin & Rod Fitting Gauge

SKU: AG-300
  • Dial reads directly in "tenths" (.0001")
  • Checks rod journal bore for distortion
  • Assures correct size to within .0001"
  • Easy to use, no "feel" required
  • Measures size instantly!
  • Wear-compensated gauge points assure permanent accuracy
  • Assures exact fits required by today's high tech engines

No rod should be reconditioned or pins fit without precise gauging. The only way to know the size is to measure the hole.

  • Exact pin size is transferred to the AG-300 Gauge with a wear-compensated setting fixture 
  • Rugged construction - all moving parts are enclosed in the housing so they are never affected by vibration or shock
  • Range: .720" to 2.687" (18 to 68mm)
  • Includes setting fixture, calibrator ring, medium and large extension point sets, accessory case, mounting bracket and instructions

The only gauge made for both clearance and press type pin fits AND the journal end of connecting rods.

You may also want:

  • Standard Replacement Point Set (AG-210)
  • Medium Replacement Point Set (AG-620)
  • Large Replacement Point Set (AG-630)
    NOTE: point sets will NOT fit AG-Gauges with serial numbers lower than 4000

View or Download the Product Instructions

More information


To return an item:
1. Write a brief note describing the reason for the return. Please be sure to include your name or company name or account number.

2. Return the item freight prepaid within 60 days from the invoice date. For best results, please ship return merchandise by UPS or Federal Express. Please keep your receipt because it may be necessary to track the package if it is lost in transit.

3. A 10% restocking fee applies on all returns unless the problem was the fault of Goodson. If so, the restocking charge is waived and shipping costs are reimbursed. Credits will be made to the account originally billed.

Send the completed Product Return Form along with the product to:

Goodson Shop Supplies
156 Galewski Drive
Winona, MN 55987

Read our complete return policy.


Goodson strives to ship orders the same day they are received. In fact, we track this on a daily basis and we are currently shipping 99.97% of orders on the same day.

We use most major carriers including FedEx, UPS, USPS and regional carrier, SpeeDee.

For more information, check out our Shipping & Delivery page.

International Sales

Goodson ships F.O.B. Winona, Minnesota, USA to most countries around the world. To find a distributor near you visit our Distributor Listing.

If there is not a distributor in your area, you can contact Goodson by phone (1-507-452-1830) or order online. Please note some items (such as Sunnen) are not available for shipping outside of the United States & Canada. If you have these items in your shopping cart, your order cannot be processed. You must remove those items from the cart to continue.

Proposition 65 Information

"Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm." -  

So, what does this mean for Goodson customers? It means that many of common products used in manufacturing contain products known to the state of California to cause cancer and/or reproductive harm. Components such as stainless steel, galvanized wire, brass, bronze, etc. can be found in the Prop 65 list and require us to provide the warning. 

You can find a complete list at the Proposition 65 website.

Proposition 65 WarningWARNING: Cancer and Reproductive Harm -