Gauge blacks, Standard inch system. Parallelism: 0.000005", Maximum tolerance: for size within 1" +0.000008/-0.000004; for size 2" +0.000016/-0.000008; for size 3" +0.000020/-0.000010; for size 4" +0.000024/-0.000012.
By clicking "Accept All Cookies", you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts.