Hi-Lok Installation Tools

Hi-Lok Protrusion Gauges

Hi-Lok Pin Protrusion Gauges are manufactured for use on all types of frangible and torque-control fasteners. These gauges determine if the correct length pin has been installed by determining if the pin’s protrusion is between the allowable minimum and maximum limits shown on the gauge.

Gauges are available for Hi-Lok, Hi-Lite, and Hi-Tigue systems. To select the correct gauge for the fastener, select the one that corresponds to the appropriate pin diameter. These are complete sets that include gauges for -5 to -12 fasteners.

Hi-Lok Protrusion Gauge features

Measures Minimum and Maximum Pin Protrusion

These Hi-Lok® grip scales feature two rulers for measuring grip length. These rulers can measure grip length of Hi-Lok® fasteners with a countersink, or with a protruding head.

Hi-Lok grip scales from Omega Technologies Diagram

Hi-Lok Protrusion Gauges
Technical Specifications
- Select A Gauge Set -

			OM2-1522 Standard Hi-Lok® and Hi-Tique Protrusion Gauge		OM2-1522-B Aerospace 'B' Hi-Lok® Protrusion Gauge		OM2-1522HST Standard Hi-Lite® Protrusion Gauge		OM2-1522HST-B Aerospace 'B' Hi-Lite® Protrusion Gauge
Dash Sizes	Nominal Pin Diameter		OM2-1522 Pin Protrusion Limits		OM2-1522-B Pin Protrusion Limits**		OM2-1522 HST Pin Protrusion Limits*		OM2-1522 HST-B Pin Protrusion Limits
Decimal	Fraction	Decimal	min	max	min	max	min	max	min	max
-5	5/32”	0.1560	0.302	0.384	0.302	0.389	0.270	0.352	0.270	0.352
-6	3/16”	0.1875	0.315	0.397	0.315	0.402	0.280	0.362	0.280	0.362
-8	1/4”	0.2500	0.385	0.467	0.385	0.472	0.310	0.392	0.310	0.392
-10	5/16”	0.3125	0.490	0.572	0.490	0.577	0.370	0.452	0.370	0.452
-12	3/8”	0.3750	0.535	0.617	0.535	0.622	0.410	0.492	0.410	0.492

			OM2-1522-2 Large Diameter Hi-Lok® and Hi-Tique Protrusion Gauge		OM2-1522HST-2 Large Diameter Hi-Lite® Protrusion Gauge

Dash Sizes	Nominal Pin Diameter		OM2-1522-2 Pin Protrusion Limits*		OM2-1522HST-2 Pin Protrusion Limits*
Decimal	Fraction	Decimal	min	max	min	max
-14	7/16"	0.4375	0.625	0.707	0.475	0.557
-16	1/2"	0.5000	0.675	0.757	0.515	0.597
-18	9/16"	0.5625	0.760	0.842	0.590	0.672
-20	5/8"	0.6250	0.815	0.897	0.650	0.732
-24	3/4"	0.750	1.040	1.122	1.040	1.122

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