Domestic Manufacturer of Rail Fasteners Since 1927
Permagrip™
Introducing the Revolutionary Lewis Permagrip™ Screw Spike
U.S. Patents 6,808,120 & 6,471,140
Easily driven into SQUARE HOLES where cut spikes have worked loose.
DRAMATIC increase in holding power.
UNIQUE tie-grabbing fins lock like claws to prevent "back out."
IDEAL for the TOUGHEST ENVIRONMENTS such as curves, switches, turnouts or bridges.
Square Head Permagrip Timber Screw Spike
2 2/3 Pitch Quad Lead Thread
| Diameter | Length | Head Diameter | Head Height | Head Button Height | Head Washer Height | Head Overall Height | Head Width | Head Length | Thread Length Nominal |
| 11/16" | 6-3/4" | 2" | 23/32" | 1/8" | 1/4" | 31/32" | 7/8" | 7/8" | 4-5/8" |
Square Head w/ Bevel Permagrip Timber Spike
2 2/3 Pitch Quad Lead Thread
| Diameter | Length | Head Diameter | Head Height | Head Button Height | Head Washer Height | Head Overall Height | Head Width | Head Length | Thread Length Nominal |
| 11/16" | 6-3/4" | 2" | 1-1/8" | 1/8" | 13/32" | 1-1/8" | 7/8" | 7/8" | 5-3/8" |
Rectangle Head w/ Bevel Permagrip Timber Screw Spike
2 2/3 Pitch Quad Lead Thread
| Diameter | Length | Head Diameter | Head Height | Head Button Height | Head Washer Height | Head Overall Height | Head Width | Head Length | Thread Length Nominal |
| 11/16" | 6-3/4" | 2" | 23/32" | 1/8" | 13/32" | 1-1/4" | 27/32" | 1-1/8" | 4-5/8" |
Photos
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Video