Case Neck Wall Thickness Micrometer

The Sinclair Case Neck Wall Thickness Micrometer is purpose-built for handloaders who demand precision ammunition. If you're serious about consistency in your reloads—whether you're chasing competitive accuracy or hunting load optimization—neck wall thickness is one of the most overlooked variables that separates good ammo from great ammo. This tool gives you the ability to measure and sort brass by neck wall uniformity, a critical step for shooters working with premium cases or salvaging fired brass from mixed sources.

Built around a Starrett micrometer head, this case neck micrometer measures in .0001-inch increments, giving you the precision necessary to identify and eliminate the thick-neck and thin-neck outliers that can cause velocity variation and pressure spikes. The micrometer head and anvil are fully adjustable—a feature that lets you measure right at the junction where the neck meets the shoulder, and zero the tool to your own feel and preferences. The built-in ratchet control prevents over-tightening, protecting both your brass and your measurement consistency. A stainless steel base keeps your hands free while measuring, and the anodized aluminum frame with stainless anvil is built to last through years of reloading sessions. The tool works for .17 caliber cases and larger, so it covers virtually every popular cartridge. It comes pre-zeroed and ready to use out of the box—no setup required. Made in the U.S.A.

Key Features

• Starrett micrometer head with .0001-inch measurement resolution
• Fully adjustable micrometer head and anvil for precise neck-to-shoulder measurements
• Ratchet control built into micrometer head prevents over-tightening
• Stainless steel base allows hands-free measuring of multiple cases
• Anodized aluminum frame with stainless steel anvil for durability
• Compatible with .17 caliber cases and larger
• Pre-zeroed and ready to use
• Made in the USA

Specifications

Frequently Asked Questions

What caliber cases can I measure with this micrometer?

The Sinclair case neck micrometer works with .17 caliber cases and larger, covering all common rifle and handgun cartridges.

Can I measure right at the neck-to-shoulder junction?

Yes. The adjustable micrometer head and anvil are specifically designed to allow you to measure neck wall thickness right up to where the neck meets the shoulder, giving you complete control over your measurement point.

Does this come pre-zeroed, or do I need to set it up?

The micrometer comes pre-zeroed and ready to use right out of the box. However, the ratchet control and adjustable design allow you to customize the zero to match your own feel and preference if you want to adjust it.

How does the stainless steel base help?

The stainless steel base keeps the micrometer stable and hands-free while you measure brass. This lets you use both hands to position and rotate cases for consistent neck wall readings across multiple rounds.