fixtek Expertise

Drilling anchor holes: drill diameter and hole depth per anchor

5 min read

An anchor only holds what its ETA promises if the drill hole is right. Drill too wide, and the expansion does not grip. Drill too shallow, and the anchor does not reach its depth or sticks out too far. Below you find, for every anchor in our range, the drill diameter, the drill hole depth and the anchoring depth, taken directly from fischer's product pages.

How to read the tables

Drill Ø (d₀): the nominal diameter of the drill bit. Never drill larger.
Min. drill hole depth (h₁): the hole must be at least this deep.
Min. drill hole depth for push-through installation (h₂): in push-through installation you drill through the fixture. fischer gives a separate minimum depth for it.
Anchoring depth (h_ef): the depth at which the anchor reaches the values in its ETA.
Fixture thickness (t_fix): the thickest part you can fix with this anchor.

For the FAZ II Plus, the first number in the size is the thread and the second is the maximum fixture thickness at standard anchoring depth. The FAZ II Plus 10/30 therefore has an M10 thread.

FAZ II Plus: key data per thread size

These values apply to every length of one thread size, in zinc-plated, stainless (R) and highly corrosion-resistant steel (HCR). They come from table B2.1 of the ETA.

Thread	Drill Ø (mm)	Max. hole in the fixture (mm)	Anchoring depth (mm)	Torque (Nm)
M6	6	7	40–80	8
M8	8	9	35–90	20
M10	10	12	40–100	45
M12	12	14	50–125	60
M16	16	18	65–160	110
M20	20	22	100–180	200
M24	24	26	125	270

Hole in the fixture: do not drill the hole in the base plate or bracket larger than the value in the third column. The ETA does not allow a larger hole.

FAZ II Plus bolt anchor

The GS and HBS versions with large washer have the same drilling data as the standard version of the same size. Where two values are given, the first applies at standard and the second at reduced anchoring depth. A dash means that fischer gives no reduced anchoring depth for that size. You find every size under bolt anchor FAZ II Plus, FAZ II Plus GS and FAZ II Plus HBS.

Size	Drill Ø (mm)	Drill hole depth h₂ (mm)	Anchoring depth (mm)	Fixture thickness (mm)	Versions
6/10	6	60	40 / –	10 / –	standard
6/20	6	70	40 / –	20 / –	standard
8/10	8	65	45 / 35	10 / 20	standard, GS
8/30	8	85	45 / 35	30 / 40	standard, GS
8/50	8	105	45 / 35	50 / 60	standard
8/100	8	155	45 / 35	100 / 110	standard
8/160	8	215	45 / 35	160 / 170	standard
10/10	10	85	60 / 40	10 / 30	standard, GS
10/20	10	95	60 / 40	20 / 40	standard
10/30	10	105	60 / 40	30 / 50	standard, GS
10/50	10	125	60 / 40	50 / 70	standard
10/70	10	145	60 / 40	70 / 90	standard
10/80	10	155	60 / 40	80 / 100	standard
10/100	10	175	60 / 40	100 / 120	standard
10/160	10	235	60 / 40	160 / 180	standard
12/10	12	100	70 / 50	10 / 30	standard, GS
12/20	12	110	70 / 50	20 / 40	standard, GS
12/30	12	120	70 / 50	30 / 50	standard, GS
12/50	12	140	70 / 50	50 / 70	standard, GS
12/60	12	150	70 / 50	60 / 80	standard
12/80	12	170	70 / 50	80 / 100	standard, GS
12/100	12	190	70 / 50	100 / 120	standard, GS, HBS
12/120	12	210	70 / 50	120 / 140	GS, HBS
12/140	12	230	70 / 50	140 / 160	GS
12/160	12	250	70 / 50	160 / 180	standard, GS
12/180	12	270	70 / 50	180 / 200	GS
12/200	12	290	70 / 50	200 / 220	standard, GS
16/5	16	115	85 / 65	5 / 25	standard
16/25	16	135	85 / 65	25 / 45	standard
16/50	16	160	85 / 65	50 / 70	standard
16/60	16	170	85 / 65	60 / 80	standard
16/100	16	210	85 / 65	100 / 120	standard
16/160	16	270	85 / 65	160 / 180	standard, GS, HBS
16/200	16	310	85 / 65	200 / 220	standard, GS, HBS
16/250	16	360	85 / 65	250 / 270	standard
16/300	16	410	85 / 65	300 / 320	standard
20/30	20	155	100 / –	30 / –	standard
20/60	20	185	100 / –	60 / –	standard
20/160	20	285	100 / –	160 / –	standard
24/30	24	185	125 / –	30 / –	standard
24/60	24	215	125 / –	60 / –	standard

FAZ II Plus K, the short version

Size	Drill Ø (mm)	Drill hole depth h₂ (mm)	Anchoring depth (mm)
8/5 K	8	45	35
10/10 K	10	65	40
10/20 K	10	75	40
12/10 K	12	80	50
12/20 K	12	90	50

FAZ II Plus with cap nut

The FAZ II Plus with cap nut needs a slightly different drill hole than the standard version.

Size	Drill Ø (mm)	Drill hole depth h₂ (mm)	Anchoring depth (mm)
10/10 H	10	87	60 / 40
10/20 H	10	97	60 / 40
12/10 H	12	99	70 / 50
12/20 H	12	109	70 / 50

The torque is in the key data table above. Tighten the nut with a torque wrench: only at that torque is the FAZ II Plus set as the ETA requires.

EA II hammerset anchor

The EA II is a hammerset anchor with internal thread. You drive it in with a hammer until it is flush with the concrete surface. Keep to the minimum drill hole depth in the table for that. The stainless version (R) has the same drilling data as the zinc-plated one. Note: the EA II-D needs a different drill than the EA II of the same size.

Size	Drill Ø (mm)	Drill hole depth h₁ (mm)	Anchoring depth (mm)	Screw-in depth min.–max. (mm)
M6x25	8	27	25	6–14
M6x30	8	32	30	6–14
M8x25	10	27	25	8–14
M8x30	10	33	30	8–14
M8x40	10	43	40	8–14
M10x25	12	27	25	10–14
M10x30	12	33	30	10–14
M10x40	12	43	40	10–17
M12x25	15	27	25	12–14
M12x50	15	54	50	12–22
M12x50 (EA II-D)	16	54	50	12–22
M16x65	20	70	65	16–28
M20x80	25	85	80	20–34

The screw-in depth is how far the bolt or threaded rod must go into the anchor: at least the first value, at most the second.

FZEA II ZYKON hammerset anchor

The FZEA II sits in an undercut drill hole. You make that hole in one go with the special drill that fischer specifies per size. fischer's product page for each size names the drill and the setting tool that go with it.

Size	Drill Ø (mm)	Drill hole depth h₁ (mm)	Anchoring depth (mm)	Screw-in depth min.–max. (mm)
10x40 M8	10	43	40	11–17
12x40 M10	12	43	40	13–19
14x40 M12	14	43	40	15–21

KDS spring toggle for trapezoidal sheet

You fix the KDS in the cavity of a steel deck or trapezoidal sheet. The drill hole is in the sheet itself.

Size	Thread	Hole Ø in the sheet (mm)
8x100	M8	22
8x200	M8	22
8x300	M8	22
8x500	M8	22
10x100	M10	25
10x200	M10	25

Never use a table value for an anchor of another brand or another series. Every ETA has its own drilling data, even for the same thread size.

Where do these numbers come from?

All values per size are on fischer's product page for that article. The key data of the FAZ II Plus come from the ETA. Where two fischer pages of the same size disagree, we took the value most pages agree on. For the torque we always follow the ETA. For a calculation and for the installation, the ETA and fischer's installation instructions apply.

This article is general information, not design advice. The text was checked on 25 October 2026 against the sources below. The design of your installation and the certifying body decide what applies in your project.

Sources

Order the right anchor

You find every size of FAZ II Plus, EA II, FZEA II and KDS from these tables in the shop. Not sure about the size? Ask the Product finder.

Go to the anchors Ask the Product finder