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Heavy-Duty Automatic Center Punch #78 - Nail Punch Tool to Mark and Scribe - Machinist Tools

Heavy-Duty Automatic Center Punch #78 - Nail Punch Tool to Mark and Scribe - Machinist Tools

Q: Has anyone tried breaking a 1/4" glass plate with this? Did it work?

If you wish to break plate use a hammer, this will work on tempered glass if any thickness

Q: Anyone use one of these to extract broken bolts? Is it strong enough to get a punch for a bit? Looking to remove a bolt inside my engine block.

I dont think john p actually ever tried this. Dont know about the cheaper utility version but the big #78 which Ive had for 15 years will put a divot in anything short of a broken drill bit. Ive removed broken taps with it a few times by softening the metal around the tap then repeatedly punching the tap in reverse. This tool has amazing power. That said, mine misfires about every half dozen clicks but doesnt bother me considering how well it works.

Q: Do i need any machine to use this or take off the bike bolts

I dont understand the question,this is a center punch,not a take off tool.I used mine once,and the tip broke off.It was a piece of junk,so I don't know.If the bike bolts are rusted,or welded,on it seems like to me you are going to have to cut em off.

Q: Would this work well to get a starter dimple for unibit/step bit when going thru metal studs or panel boxes?

It might. It works better if you drill a starter hole with a twist drill first. Usually the step-bit and unibit drills don't have enough of a point to start in the dimple that the center punch makes.

Product ID: 276786593

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Details

Material
Heavy Duty
Colour
Black
Brand
General Tools
Item weight
0.3 Pounds
Operation mode
Manual

🎯Replaceable hardened steel tip

⚙️Heavy-duty steel body

🛠️Adjustable spring tension

Frequently Bought Together

General Tools Heavy-Duty Automatic Center Punch #78 - Nail Punch Tool to Mark and Scribe - Machinist Tools

General Tools 78P Replacement Point for General Tools 78 Heavy Duty Steel Automatic Center Punch

General Tools 88CM Tungsten Carbide Scribe and Magnet, Copper, Replaceable Tip

Description

🎯 Punch Perfect Every Time — Mark Your Masterpiece with Confidence!

BUILT TO LAST - Rust-resistant black oxide finish and heavy-duty steel construction for enduring performance.
GRIP LIKE A PRO - Knurled finger grip offers secure handling and reduces slippage for safer use.
ONE HANDED POWER PLAY - Automatic spring-loaded mechanism delivers consistent strikes—no hammer needed.
VERSATILE CRAFTSMANSHIP - Perfect for machinists, metalworkers, automotive pros, and DIYers aiming for flawless results.
PRECISION MARKING ZERO SLIP - Conical hardened steel tip ensures exact hole placement without surface damage.

The Heavy-Duty Automatic Center Punch #78 is a precision tool crafted from durable steel with a replaceable hardened tip and adjustable spring tension. Designed for effortless one-handed use, it delivers accurate, slip-free marks on wood and metal surfaces. Featuring a knurled grip and rust-resistant finish, this tool is essential for professionals and DIY enthusiasts seeking reliable, long-lasting performance in marking and scribing tasks.

Specifications

Manufacturer	GE Lighting
Part number	78
Item Weight	136 g
Item model number	78
Color	Black
Style	Heavy Duty Steel
Material	Heavy Duty Steel
Power source type	Hand Powered
Item Package Quantity	1
Number Of Pieces	1
Cutting Diameter	0.08 Inches
Included components	Unit^Instruction Guide
Batteries Required?	No
Item diameter	0.08 Inches

Have a Question? See What Others Asked

Has anyone tried breaking a 1/4" glass plate with this? Did it work?

Anyone use one of these to extract broken bolts? Is it strong enough to get a punch for a bit? Looking to remove a bolt inside my engine block.

Do i need any machine to use this or take off the bike bolts

Would this work well to get a starter dimple for unibit/step bit when going thru metal studs or panel boxes?

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