Which is the dimensions of the hexagonal head bolts and washers? I had other t-track measures and I like to confirm them all...

Bolt head across the flats 7/16” or .440 Washer outside 5/8” or .629 inside 1/4” or .258 Bolts are standard 1/4 x20x1-1/2”

Are these actually thru holes or are they threaded for 1/4-20

These are actually 1/4" x 20 threaded through holes. I would say these were a good buy for what I paid. You get 10 of each threaded knobs, washers, and threaded screws.

What material are the washers? Are they concave?

Don't know what material, but the washers are flat - not concave.

How long is the thread area

The actual threaded shank is 1” not counting the knob. Hope this helps.

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1/4"-20 Knob Kits

Product ID: 40618470

Details

Brand
POWERTEC
Color
black silver
Item dimensions L x W x H
8 x 4 x 2
Material
Other
Size
1/4"-20 Knob

🔩10-piece T-track knob set

⚙️¼”-20 hex head bolts included

🛠️Fits mini & universal T-tracks

€ 20.62

Duties & taxes included

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Description

🔧 Elevate your workshop game with POWERTEC’s pro-grade T-track knob kit!

COMPLETE 10 PIECE KIT - Everything you need—knobs, bolts, washers—ready to upgrade your workshop setup.
HEAVY DUTY STEEL BOLTS - Durable 1/4-20 x 1-1/2” hex bolts ensure rock-solid fixture stability.
SHOP READY VERSATILITY - Ideal for router tables, miter gauges, feather boards, and all your custom woodworking jigs.
UNIVERSAL COMPATIBILITY - Seamlessly fits both ¼” mini and standard T-tracks for versatile jig building.
ERGONOMIC TRIPLE POINT KNOBS - Comfort grip with matte black thermoplastic finish for effortless adjustments.

The POWERTEC 71068 T Track Knob Kit includes 10 durable knobs, ¼”-20 hex bolts, and washers designed for woodworking jigs and fixtures. Featuring a comfortable triple-point grip and universal compatibility with mini and standard T-tracks, this kit offers reliable, easy-to-install hardware that enhances precision and stability across a wide range of shop applications.

Specifications

ASIN	B01N5WC8BK
Assembled Diameter	0.44 inches
Best Sellers Rank	#30,925 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #54 in Power Tool Accessory Jigs
Color	Black, Silver
Customer Reviews	4.6 4.6 out of 5 stars (4,869)
Cutting Diameter	0.44 inches
Date First Available	February 3, 2017
Finish	Matte
Handle Material	Alloy Steel
Head Style	Hex
Included Components	T-Track Knobs
Item Package Quantity	1
Item Weight	9 ounces
Item model number	71068
Manufacturer	POWERTEC
Material	Other
Measurement System	English/Standard
Number Of Pieces	10
Part Number	71068
Pattern	T-Track
Shape	Round
Size	1/4"-20 Knob Kits, Set of 10
Special Features	Easy to Install, Sturdy
Style	T track knob kits

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