Would these do well on galvanized pipes that are round vs square?

Yes - these will actually work extremely well with square pipe. With round pipe the flange may not seat correctly being that the head of the insert is flat.

Who makes a mandrel for this? Drill/Impact and bolt not working in particular application.

Is the mandrel too short to set the insert? We recommend a mandrel length of at least 1.75" long. We do sell this size, but not on Amazon.

What size drill bit is suitable for installing these? I'll be increasing the size of various existing holes in my Sprinter van to fit these. Thanks

The recommended work hole diameter is .390 - so a 25/64 drill bit will work.

Is there a 1/4-20 that is shorter than 1"? (Don't have enough clearance on back, but need the strength of 1/4")?

For Multi-Grip inserts - No - the shortest available length available is 1". However a Thin-Nut Steel Threaded insert's length is .680 (actual grip range is .165-.260) - here's a link: https://www.amazon.com/s?k=skl2520260&ref=nb_sb_noss

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🔧 Fasten like a pro, shine like gold!

DURABLE FINISH - Gold zinc coating resists corrosion and adds sleek style
PRECISION THREADING - Secure 1/4-20 thread size for reliable fastening
ANTI ROTATION DESIGN - Knurled body ensures no slip, no spin during installation
VERSATILE GRIP RANGE - Accommodates materials from .020 to .280 inches effortlessly
EFFORTLESS INSTALLATION - Compatible with manual and power tools for fast setup

The S25MG280 Steel Pre-Bulbed Shank Multi-Grip Rivet-Nut by Hanson Rivet offers a robust 1/4-20 thread size with a versatile grip range of .020 to .280 inches. Its knurled body prevents rotation, ensuring secure fastening in blind holes. Finished with a corrosion-resistant gold zinc coating, this pack of 25 alloy steel rivet-nuts is designed for quick, reliable installation using manual or power tools—perfect for professionals demanding durability and precision.

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Manufacturer	HANSON RIVET
Part number	R-S25-280MG
Item Weight	59 g
Manufacturer reference	R-S25-280MG
Size	One Size
Colour	Gold
Finish	zinc
Material	Alloy Steel
Shape	Hexagonal
Item Package Quantity	1
Number of Pieces	25
Cutting Diameter	0.25 Inches
Batteries included?	No
Batteries Required?	No
Item diameter	0.25 Inches

S25MG280 STEEL PRE-BULBED SHANK, MULTI-GRIP RIVET-NUT GOLD ZINC FINISH, 1/4-20 X .020-.280 GRIP RANGE (PACK OF 25), Model: (Tools & Outdoor gear supplies) by Hanson Rivet

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