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You Are Here: Screw Terminology


Definitions

ASTM

American Society of Testing Materials

ICBO

International Conference of Building Officials

ISO

International Standards Organization

Kesternich Test

A test of the corrosion resistance of materials and fasteners which involves repeated condensation and drying cycles. GRABBER fasteners submitted for Kesternich tests are maintained at 18° C to 28° C and 75% humidity for 16 hours, after being exposed to a contained sulfur dioxide atmosphere at 40° C and 100% humidity for 8 hours. Test results are expressed in the number of cycles of exposure completed without evidence of normal corrosion.

Pull-out Resistance

Amount of force required to pull a fastener out of a specified thickness of wood or steel.

Salt Spray Test

A common testing method to determine the corrosion resistance of plating and finishes. Fasteners and materials to be tested are placed in a fog chamber with an atmospheric mixture of water and sodium chloride that is maintained at 100% humidity. Test results are expressed in hours of exposure without evidence of normal corrosion. Tests are conducted in accordance to ASTM B117.

Shear Strength

Measure of the force that when applied at a right angle, will break a fastener.

Ultimate Load

A load that during a controlled test, produced complete failure of the fastener.

Descriptions

Drivall®

GRABBER line of self drilling screws for use with 12-20 gauge steel.

GRABBER Fasteners

Coarse thread screws with super-sharp points, designed for drywall to wood and wood-to-wood applications.

Pilot Point

A self drilling screw with an unthreaded portion of the shank between the point and the threads. Designed to attach wood or plywood to 14-20 gauge steel.

Self Drilling Screws

Fasteners with a point capable of drilling into medium to heavy 12–20 gauge steel. Drill points are classified as #1 through #5, with a #5 point being capable of penetrating thicker gauge metals. GRABBER manufactures fasteners with #2, #3, and #4 points.

Self Tapping Screws

A fastener that can tap its own threads. All GRABBER drywall screws are self tapping.

Streaker® Fasteners

Self-tapping screws with a unique thread, and a hardened, extra-sharp 23° point that allows direct penetration of 20 to 25 gauge steel.

Winged Fasteners

Used to attach plywood or particle board to 12-16 gauge steel. The wings bore a hole in the wood greater in diameter than the major diameter of the screw. As the point of the fastener enters the metal, the wings are broken off, allowing the fastener to tap into the metal.

Fastener Points

Auger Point

A knurled thread used to ream out material to reduce driving torque in hard materials.

Grabber Point

Coarse thread screws with super-sharp points, designed for wood-to-wood applications.

Pilot Point

A self drilling point with an unthreaded portion of the shank between the point and the threads, designed to attach wood or plywood to medium gauge metal.

QuickGrab Point

The QuickGrab point is an extra sharp point that helps the screw start faster. Grabber's exclusive QuickGrabTM point ensures screws start quicker and drive faster.

Streaker Point

Piercing sharp pointed gypsum board screw for metal studs. The STREAKER has an especially sharp point having multiple threads occurring within the other in the body portion of the screw. In the tapered portion of the screw, one of the threads gradually decreases in diameter and fades into the tapered portion of the shank and terminates. The other thread continues on toward the point end, decreases in diameter and fades into the tapered portion of the shank at a point nearer the pointed end of the screw.

Type 17 Point

A screw slotted at the point (shank slotted) to aid in drilling and displacing hard materials.

Winged Point

Used to attach plywood or particle board to medium or heavy gauge steel. The wings bore a hole in the wood greater in diameter than the major diameter of the screw. As the point of the fastener enters the metal, the wings are broken off, allowing the fastener to tap into metal.

Fastener Heads

Bugle Head

Designed to seat fast and easily into wood or drywall.

Hex Head

High torque head for metal-to-metal applications.

Pan Head

High torque head for metal-to-metal applications.

Scavenger Head

Designed to eliminate paper burrs in drywall with a secondary ring under the normal Bugle head design. This double head effectively reduces paper burns for a cleaner finish.

Trim Head

Narrow head for finishing applications.

Wafer Head

Low profile head for wood, lath, and metal-to-metal applications.

Fastener Drives

Lox Drive™

A "stick fit", high torque recess that eliminates the need for a magnetic bit holder.

Phillips Recess

Standard recess for a pointed, cross-shaped driver.

Square Recess

Four-sided recess.

Finishes

Clear Zinc

A silver-colored plating that inhibits rust, usually used on fasteners for lath to steel and steel to steel applications.

GrabberGardTM

A specially formulated plating for corrosion protection on exterior grade fasteners

Gray Phosphate

Common gray colored plating for drywall screws.

Yellow Zinc

A yellow/gold plating used on fasteners designed for interior applications when appearance is a concern, such as in cabinet installation.


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