Staking Punches Conversion Charts K&D, Marshall, Boley, Star & Bergeon 1 of 2

If you have spent any time with staking sets, you know the difficulty of finding compatible ID numbers and what they mean. You will find in this post, a conversion chart for Flat Face Hole Punches (Flachpunzen, ungebohrt). See the description below the chart.

		K&D	Marshall	Boley	Star	Bergeon
Flat Face Hole Punches
		43		36
		44	A2	35
		45	A3	33	65	222
		46	A5	31	66	221
		47	A6	30
		48	A7	29
				28	67	219
		49	A8	27
		50	A9	26	68	217
		51	A10	25
		52	A12	24	68A	215
				23	69	214
		53	A13	22	69A	213
		54	A14	21	70	212
		55	A15
		56		20.5
		57
		58	A16	20	70A	211
		59	A17	19.5
		59A		19	71	210
		60	A18
		61		18.5
		62	A19
		63	A20	18	72	208
				17	73	206
		63A	A21	17.5
		64	A22	16.5
		65	A23
		66	A24	16	74	204
		67	A24	15.5
		68	A26	15	75	202
		69	A27
		70	A28
		71	A29
		71A	A31
		72
		72A	A32
		73	A30	14	76	200
		73A	A33

For final staking of balance staffs

For final staking of train pinions

For pressing hairspring collets on balance wheels

For use as stumps when inverted into the staking tools. Ideal for riveting “hard” staffs will save wear and tear on the expensive die plate.

When used for final staking of a balance staff or pinion, it is important to select the correct size punch for doing a good job and avoiding damage to the punch. A proper fitting punch should fit freely over the collet hub with a clearance of about .02 to .03 mm. Always tap the punch lightly with a brass hammer turn- ing it about one quarter of a turn after each blow.

If you select too large a punch, it is possible that you may not obtain the full degree of bearing surface, thereby, placing too much pressure on the inside corner of the punch causing it to flatten out or chip. If you select too small a punch, the staff becomes a wedge and will split the punch or round the inside corners of the punch.