The values shown for the overall length, thread journal length, and diameter of the base are ideal values and may vary slightly due to machining tolerances. We have noted a wide variety of nipple threads and lengths used on imported rifles and percussion revolvers, especially on the early imports from the 1960's and 1970', even on the same model from the same maker. We recommend confirming the thread, overall length, thread journal length, base diameter, and comparing the cone length. Cone length = overall length minus thread journal length. The cone length must be similar in length to the original nipple to assure good function especially in percussion revolvers. * Variations exist on many early imported revolvers. Many pre-1980 revolvers will have relatively short 6-.75mm threaded nipples.