BI-METAL HOLE SAWS – TOOLS WITH AN EXTREMELY WIDE RANGE OF APPLICATIONS

WHAT ARE BI-METAL HOLE SAWS?

Bi-metal hole saws, also known as hole cutters or hole saws, are universal tools used for drilling holes in a wide range of materials and are an ideal choice for numerous applications.

Their design combines the durability of high-speed steel (HSS) with the flexibility of softer steel. This is where the name bi-metal (2 metals) comes from. While the body of the hole saw, made of softer steel, provides flexibility and resistance to cracking, the outer toothed cutting edge is manufactured from high-speed steel (HSS) or high-speed steel with 8% cobalt (HSS-Co. 8%), ensuring sufficient hardness and sharpness. This combination enables efficient cutting of hard materials while ensuring a long tool life.

APPLICATIONS OF BI-METAL HOLE SAWS

Bi-metal hole saws are highly versatile and are used in many professions and industries:

Electrical installation: Electricians use them to create holes in distribution boxes, switch boxes and conduits. They cut materials such as steel, aluminium and plastic, providing clean and precise holes for installing electrical components.
Plumbing, heating and gas installation: In the HVAC industry they are used for creating openings in pipes and other equipment. They are capable of cutting materials such as sheet metal and fibreglass, making the installation of ventilation grilles and ducting much easier.
Construction: In the construction industry they are indispensable for cutting holes in materials such as plasterboard and other lightweight building materials. These hole saws withstand demanding job-site conditions while providing reliable performance.
Automotive industry: In the automotive sector they are used for vehicle modifications and repairs, for example for drilling mounting holes for accessories or bodywork repairs.

Thanks to a wide range of mounting adapters, they can be used with cordless screwdrivers, hand drills, drill presses and even small rotary hammers.

COBALT OR HSS HOLE SAWS – WHICH SHOULD YOU CHOOSE?

Our range includes both HSS (high-speed steel) hole saws and HSS-Co. 8% (cobalt) hole saws.

Choose the right type according to the material you want to drill:

HSS Bi-Metal Hole Saws

Ideal for drilling into plasterboard, wood and plastics.

Suitable for metal only up to a material strength of 700 N/mm².

In our product range they are available in red.

HSS-Co 8% Bi-Metal Hole Saws

Unlike standard HSS hole saws, they are suitable for drilling metals with tensile strength up to 1000 N/mm², including stainless steel and Hardox.

However, they are less suitable for other materials such as plasterboard, wood, etc.

In our product range they are available in white.

Technical Specifications:

Cutting depth: 35 mm
Variable tooth pitch
Hole saws up to Ø 30 mm are equipped with a 1/2"-20 UNF thread
Hole saws from Ø 32 mm are equipped with a 5/8"-18 UNF thread

Recommended Accessories:

Drive Adapters for Hole Saws

Depending on the diameter of the hole saw and the tool you are using, the hole saw must be assembled
with the appropriate arbor (Item No. 5102).

Don't miss the latest addition to our range – the QuickChange quick-release system.

Pilot Drills

All our arbors are supplied complete with a pilot drill.

If required, the pilot drill can also be purchased separately (Item No. 5103).

Ejection Spring

For easier removal of the cut-out material from the hole saw, we recommend fitting an ejection spring onto the pilot drill (Item No. 5105).

Extension

If the material is difficult to access, an extension for bi-metal hole saws can be used (Item No. 5104).

Important:

When drilling, always follow the recommended drilling speeds (see speed chart) and use a cooling lubricant (cutting oil or emulsion) when drilling into metal.

Ø mm	Unalloyed steel	Stainless steel	Cast iron	Brass	Aluminium	Ø mm	Unalloyed steel	Stainless steel	Cast iron	Brass	Aluminium

14	550	300	400	790	900	64	132	70	90	180	205
16	530	275	365	730	825	65	130	65	85	175	200
17	500	250	330	665	750	67	130	65	85	170	195
19	460	230	300	600	690	70	125	60	80	160	185
21	425	210	280	560	630	73	120	60	80	160	180
22	390	195	260	520	585	76	115	55	75	150	170
24	370	185	245	495	555	79	110	55	70	145	165
25	350	175	235	470	525	83	105	50	70	140	155
27	350	160	215	435	480	86	100	50	65	130	150
29	300	150	200	400	450	89	95	45	60	125	145
30	285	145	190	380	425	92	95	45	60	120	140
32	275	140	180	360	410	95	90	45	60	120	135
33	260	135	175	345	390	98	90	45	60	115	130
35	250	125	165	330	375	102	85	40	55	115	125
37	240	120	160	315	360	105	85	40	55	110	120
38	230	115	150	300	345	108	80	40	55	110	115
40	220	110	145	290	330	111	80	40	50	100	110
41	210	105	140	280	315	114	75	35	50	100	105
43	205	100	135	270	305	121	70	35	45	90	95
44	195	95	130	260	295	127	65	30	40	85	90
46	190	95	125	250	285	140	60	30	35	80	85
48	180	90	120	240	270	146	55	25	35	75	80
51	170	85	115	230	255	152	55	25	35	75	80
52	165	80	110	220	245	160	50	25	35	75	75
54	160	80	105	210	240	165	50	25	35	75	75
57	150	75	100	200	235	168	50	25	35	75	75
59	145	75	100	195	225	178	45	20	30	65	65
60	140	70	95	190	220	200	40	20	25	60	60

OUR TIP

If you want to use bi-metal hole saws for installing electrical back boxes in plasterboard, wood, chipboard or OSB boards, don't overlook our special bi-metal hole saws with a counterbore.

Bi-metal hole saws with a counterbore allow you to drill the hole and countersink its edge in a single operation so that the outer flange of the electrical back box fits perfectly flush with the material (Order No. 5108 or 5118).

BI-METAL HOLE SAWS – TOOLS WITH AN EXTREMELY WIDE RANGE OF APPLICATIONS

WHAT ARE BI-METAL HOLE SAWS?

APPLICATIONS OF BI-METAL HOLE SAWS

COBALT OR HSS HOLE SAWS – WHICH SHOULD YOU CHOOSE?