Round Head Machine Screws

Round Head Machine Screws

H-STRUT Threaded Fastener Round Head Machine Screws are designed with specially formed teeth in the parallel channel recesses to grip the returned lip of the channel. The shearing action of the teeth assures positive locking of the H-STRUT channels to the fittings.

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H-STRUT Threaded Fastener Round Head Machine Screws are manufactured from mild steel bars, and are case hardened to a depth of 0.003" to 0.005" after machining, conforming to ASTM A-576 GR1015. Selected sizes also available in Stainless Steel.


All H-STRUT Grip Lock Nuts and Hardware have an electro-galvanized finish (ASTM B-633), unless otherwise noted.


On the H-STRUT Grip Lock Nuts, consult the selection table which shows the correct locking nut for each size channel. On the Hardware please specify the diameter or size required, and length where applicable.

Technical Information

Diameter Length Wt./100 Pcs.
1/4" 3/4" 1.2
1/4" 1" 1.5
1/4" 1-1/4" 1.8
5/16" 1" 2.6
5/16" 1-1/4" 3
5/16" 1-1/2" 3.6
3/8" 1" 4.1
3/8" 1-1/4" 4.7
3/8" 1-1/2" 5.3
3/8" 2-1/2" 7.7