Blind-Hole Spotters | McMaster-Carr

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110 Products

Center-Locating Punches for Unthreaded Closed-End Holes

Also known as blind-hole spotters, these punches fit into closed-end holes and mark the center of a complementary hole. Once the punch is fitted in a hole, place your workpiece against the punch and strike with a hammer to make an indentation.

Inch
Dia.	Punch Material	Grip Texture	Pkg. Qty.		Pkg.
1/8"	Steel	Smooth	6	00000000	000000
5/32"	Steel	Smooth	6	00000000	00000
3/16"	Steel	Smooth	6	00000000	00000
7/32"	Steel	Smooth	6	00000000	00000
1/4"	Steel	Smooth	6	00000000	00000
9/32"	Steel	Smooth	6	00000000	00000
5/16"	Steel	Smooth	6	00000000	00000
11/32"	Steel	Smooth	6	00000000	00000
3/8"	Steel	Smooth	6	00000000	00000
13/32"	Steel	Smooth	6	00000000	00000
7/16"	Steel	Smooth	6	00000000	00000
15/32"	Steel	Smooth	6	00000000	00000
1/2"	Steel	Smooth	6	00000000	00000
17/32"	Steel	Smooth	6	00000000	00000
9/16"	Steel	Smooth	6	00000000	00000
19/32"	Steel	Smooth	6	00000000	00000
5/8"	Steel	Smooth	6	00000000	00000
21/32"	Steel	Smooth	6	00000000	00000
11/16"	Steel	Smooth	6	00000000	00000
23/32"	Steel	Smooth	6	00000000	00000
3/4"	Steel	Smooth	6	00000000	00000
25/32"	Steel	Smooth	6	00000000	00000
13/16"	Steel	Smooth	6	00000000	00000
27/32"	Steel	Smooth	6	00000000	00000
7/8"	Steel	Smooth	6	00000000	00000
29/32"	Steel	Smooth	6	00000000	00000
15/16"	Steel	Smooth	6	00000000	00000
31/32"	Steel	Smooth	6	00000000	00000
1"	Steel	Smooth	6	00000000	00000
Metric
3mm	Steel	Smooth	6	0000000	00000
4mm	Steel	Smooth	6	0000000	00000
5mm	Steel	Smooth	6	0000000	00000
6mm	Steel	Smooth	6	0000000	00000
7mm	Steel	Smooth	6	0000000	00000
8mm	Steel	Smooth	6	0000000	00000
9mm	Steel	Smooth	6	0000000	00000
10mm	Steel	Smooth	6	0000000	00000
11mm	Steel	Smooth	6	0000000	00000
12mm	Steel	Smooth	6	0000000	00000
13mm	Steel	Smooth	6	0000000	00000

Center-Locating Punch Sets for Unthreaded Closed-End Holes

66-Punch Set

108-Punch Set

Number of Pieces	Includes	Punch Material	Grip Texture	Container Type		Each
66	Punches with 11/16" to 1" (in 1/32nds increments) Point Dia.	Steel	Smooth	Metal Case	0000000	0000000
108	Punches with 1/8" to 21/32" (in 1/32nds increments) Point Dia.	Steel	Smooth	Metal Case	0000000	000000

Center-Locating Punches for Threaded Holes

Also known as transfer screws, these punches can be used in any threaded hole to transfer the hole location. Use the handle to screw a punch into a hole. Place your workpiece against the punch and strike it with a hammer to mark the hole location.

Inch
Thread Size	Includes	Punch Material	Grip Texture		Each
4-40	Handle, Six Punches	Steel	Smooth	0000000	000000
4-48	Handle, Six Punches	Steel	Smooth	0000000	00000
5-40	Handle, Six Punches	Steel	Smooth	0000000	00000
5-44	Handle, Six Punches	Steel	Smooth	0000000	00000
6-32	Handle, Six Punches	Steel	Smooth	0000000	00000
6-40	Handle, Six Punches	Steel	Smooth	0000000	00000
8-32	Handle, Six Punches	Steel	Smooth	0000000	00000
8-36	Handle, Six Punches	Steel	Smooth	0000000	00000
10-24	Handle, Six Punches	Steel	Smooth	0000000	00000
10-32	Handle, Six Punches	Steel	Smooth	0000000	00000
12-24	Handle, Six Punches	Steel	Smooth	0000000	00000
12-28	Handle, Six Punches	Steel	Smooth	0000000	00000
1/4"-20	Handle, Six Punches	Steel	Smooth	0000000	00000
1/4"-28	Handle, Six Punches	Steel	Smooth	0000000	00000
5/16"-18	Handle, Six Punches	Steel	Smooth	0000000	00000
5/16"-24	Handle, Six Punches	Steel	Smooth	0000000	00000
3/8"-16	Handle, Six Punches	Steel	Smooth	0000000	00000
3/8"-24	Handle, Six Punches	Steel	Smooth	0000000	00000
7/16"-14	Handle, Six Punches	Steel	Smooth	0000000	00000
7/16"-20	Handle, Six Punches	Steel	Smooth	0000000	00000
1/2"-13	Handle, Six Punches	Steel	Smooth	0000000	00000
1/2"-20	Handle, Six Punches	Steel	Smooth	0000000	00000
9/16"-12	Handle, Six Punches	Steel	Smooth	0000000	00000
9/16"-18	Handle, Six Punches	Steel	Smooth	0000000	00000
5/8"-11	Handle, Six Punches	Steel	Smooth	0000000	00000
5/8"-18	Handle, Six Punches	Steel	Smooth	0000000	00000
3/4"-10	Handle, Six Punches	Steel	Smooth	0000000	00000
3/4"-16	Handle, Six Punches	Steel	Smooth	0000000	00000
7/8"-9	Handle, Six Punches	Steel	Smooth	0000000	00000
7/8"-14	Handle, Six Punches	Steel	Smooth	0000000	00000
1"-8	Handle, Six Punches	Steel	Smooth	0000000	00000
1"-14	Handle, Six Punches	Steel	Smooth	0000000	00000
Metric
M3 × 0.5 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M4 × 0.7 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M5 × 0.8 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M6 × 1 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M8 × 1.25 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M10 × 1.5 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M12 × 1.75 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M14 × 2 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M16 × 2 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M20 × 2.5 mm	Handle, Six Punches	Steel	Smooth	0000000	00000
M24 × 3 mm	Handle, Six Punches	Steel	Smooth	0000000	00000

Center-Locating Punch Sets for Threaded Holes

Inch
Number of Pieces	Includes	Punch Material	Grip Texture	Container Type		Each
16	Handle, Four punches each in the following sizes: 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14	Steel	Smooth	Plastic Case	0000000	000000
16	Handle, Four punches each in the following sizes: 4-40, 6-32, 8-32, 10-24	Steel	Smooth	Plastic Case	0000000	00000
16	Handle, Four punches each in the following sizes: 1/2"-13, 9/16"-12, 5/8"-11, 3/4"-10	Steel	Smooth	Plastic Case	0000000	00000
Metric
16	Handle, Four punches each in the following sizes: M3, M4, M5, M6	Steel	Smooth	Plastic Case	0000000	00000
16	Handle, Four punches each in the following sizes: M14, M16, M20, M24	Steel	Smooth	Plastic Case	0000000	00000
16	Handle, Four punches each in the following sizes: M6, M8, M10, M12	Steel	Smooth	Plastic Case	0000000	00000

Self-Aligning Center-Locating Punches for Threaded Holes

Also known as transfer screws, these punches have a uniform shoulder height so you can quickly transfer multiple hole locations at once. Thread the punches into closed-end holes and tighten with pliers or a wrench, then strike the workpiece with a hammer to mark the holes.

Thread Size	Shoulder Ht.	Punch Material	Grip Texture		Each
10-24	0.02"	Steel	Smooth	0000000	00000
10-32	0.02"	Steel	Smooth	0000000	0000
1/4"-20	0.02"	Steel	Smooth	0000000	0000
1/4"-28	0.02"	Steel	Smooth	0000000	0000
5/16"-18	0.02"	Steel	Smooth	0000000	0000
5/16"-24	0.02"	Steel	Smooth	0000000	0000
3/8"-16	0.02"	Steel	Smooth	0000000	0000
3/8"-24	0.02"	Steel	Smooth	0000000	0000
7/16"-14	0.02"	Steel	Smooth	0000000	0000
7/16"-20	0.02"	Steel	Smooth	0000000	0000
1/2"-13	0.02"	Steel	Smooth	0000000	0000
1/2"-20	0.02"	Steel	Smooth	0000000	0000
5/8"-11	0.02"	Steel	Smooth	0000000	0000
3/4"-10	0.02"	Steel	Smooth	0000000	0000

Self-Aligning Center-Locating Punch Sets for Threaded Holes

Number of Pieces	Includes	Shoulder Ht.	Punch Material	Grip Texture		Each
12	Four punches each in the following sizes: 10-24, 10-32, 1/4"-20	0.02"	Steel	Smooth	0000000	000000
12	Four punches each in the following sizes: 1/4"-20, 5/16"-18, 3/8"-16	0.02"	Steel	Smooth	0000000	00000
12	Four punches each in the following sizes: 1/2"-13, 5/8"-11, 3/4"-10	0.02"	Steel	Smooth	0000000	00000
12	Four punches each in the following sizes: 7/16"-14, 1/2"-13, 5/8"-11	0.02"	Steel	Smooth	0000000	00000
12	Four punches each in the following sizes: 5/16"-18, 3/8"-16, 1/2"-13	0.02"	Steel	Smooth	0000000	00000