Are these threaded all the way through, such that a bolt can completely pass through (ie, in one end and out the other)?

The thread does not go all the way through. Whatever you are trying to compress must reach its limit within the length of the thread.

What size connector bolt do I buy for this?

This is what I used. 2 of Hard-to-Find Fastener 014973445713 Joint Connector Bolt (10 Piece), 1/4-20 x 1.18", Black

What is the diameter of the the head: 13 or 17mm?

The diameter of the head is 17mm.

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Hillman 12 Pcs Joint Connector Nuts (1/4"-20 x 1/2") | Black Oxide Steel Connector Barrel Nuts with Hex Socket Drive | Furniture & Cabinet Fasteners for Wood-to-Wood Assembly

Product ID: 59539667

Details

Material
Steel
Fastener Type
Twist-On
Thread Size
1/4"-20
Exterior Finish
Black Oxide
Color
Black Oxide

🔩1/4"-20 thread

🖤Sleek black oxide finish

⚙️High-strength steel

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KD 9.43

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Sold byAmazon KUWAITDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Elevate your projects with style and strength!

SLEEK AESTHETIC - The black oxide finish adds a modern touch to any project.
ROBUST CONSTRUCTION - Crafted from high-strength alloy steel for durability.
CONVENIENT ASSORTMENT - Includes 12 pieces for all your connecting needs.
PRECISION ENGINEERING - 1/4"-20 coarse thread ensures a secure fit.
VERSATILE APPLICATIONS - Perfect for furniture and cabinetry projects.

The Black Oxide Joint Connector Nut (1/4"-20) is designed for furniture and cabinetry applications, featuring a robust high-strength steel construction and a sleek black oxide finish. With a versatile range of lengths from 1/2" to 2-3/4", this connector nut ensures a secure fit and modern aesthetic for all your DIY projects.

Specifications

Material	Steel
Fastener Type	Twist-On
Thread Size	1/4"-20
Exterior Finish	Black Oxide
Color	Black Oxide
Metal Type	Alloy Steel
Finish Type	Black Oxide
Drive System	Hex Socket
Brand	Hillman
Item Weight	0.2 Pounds
Thread Type	Unified National Coarse
Inside Thread Size	#0.248
Grade Rating	industrial
Thread Style	Right Hand
Thread Coverage	Partially Threaded
Thread Class	Class 2A
Size	1/4"-20
Head Style	Flat
Item Diameter	0.25 Inches
Compatible groove diameter	0.25 Inches
Number of Pieces	12
UPC	008236387995
Global Trade Identification Number	00008236387995
Manufacturer	The Hillman Group
Part Number	57148
Item Weight	3.2 ounces
Country of Origin	China
Item model number	57148
Finish	Black Oxide
Item Package Quantity	1
Cutting Diameter	0.25 Inches
Measurement System	Inch
Certification	An
Special Features	Assortment
Usage	Wood
Included Components	Connectors
Batteries Included?	No
Batteries Required?	No

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