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KNOWLEDGE CENTER: HINGES & CONNECTION SYSTEMS

If you can conceive it, Normont’s application engineers will help you design it

Nomenclature

HINGE PARTS
HINGE LENGTH
The length of the leaves measured parallel to the pin. 		LEAF WIDTH
The dimension from the center of the pin to the outer edge of the leaf. 		PITCH
The dimension from a point on the knuckle to the same point on an adjacent knuckle on the same leaf. 		KNUCKLE LENGTH
The nominal or typical dimension for the knuckle measured parallel to the pin.
HINGE WIDTH
The overall dimension of the leaves measured perpendicular to the pin. 		END PLAY
The amount of axial movement between the leaves. 		KNUCKLE
(LOOP, JOINY, CURL)
The hollow circular part of a hinge through which a pin is passed. 		PIN
Rod running the length of the hinge. The pin holds the leaves of the hinge together.
LEAF
That portion of a hinge extending laterally from the knuckle. 		PAINT CLEARANCE
The dimension between the outer edge of the knuckle and the opposing edge of the leaf over the entire range of pivotal movement of the hinge. 		SIDE PLAY

The amount of movement of the leaves perpendicular to the pin.

 
       
HOLES
TYPE OF HOLES
Hinges are carried in inventory without holes. In addition to round holes and slots, we are tooled for a number of other shapes as illustrated. 		HOLE LOCATIONS
A sketch or sample showing hole location is required. Please submit a drawing or sample. 		COUNTERSUNK HOLES
Please specify screw size when ordering countersunk holes. 		 

Swaging, Assembly And Stop Hinges

SWAGING

OPEN


CLOSED

 PLAIN OR STANDARD ASSEMBLY
This is a surface-type hinge.
The leaves lie flat in the same plane when in the open position.
unless otherwise indicated, this type of hinge will be supplied.

REVERSED SWAGED		 REVERSE SWAGED
One leaf swaged to simulate reversed assembly.
Leaves will not close to a parallel position.

ONE LEAF FULL SWAGED		 ONE LEAF FULL-SWAGED
One leaf swaged equal to the pin diameter. Both leaves parallel when in a closed position.

OPEN		 REVERSE ASSEMBLY
Neither leaf swaged.
Opposing leaves extend laterally from opposite sides of pin.
Leaves will not close to parallel position.

ONE HALF SWAGED		 ONE LEAF HALF-SWAGED
One leaf swaged one half pin diameter.

BOTH LEAVES HALF-SWAGED		 BOTH LEAVES HALF-SWAGED
Both leaves are swaged approximately one-half the pin diameter with a minimum clearance between leaves when parallel.

OFFSET		 OFFSET
Forming one or both leaves away from the center of the pin.
Offsetting slightly decreases leaf width.
SWAGING STOP HINGE
A hinge manufactured to limit the travel of the leaves to a specified angle.

INSIDE OPERATING ARC		 INSIDE STOP HINGE
Leaves will open from a closed position, leaves parallel to each other, to a stop angle as specified.

OUTSIDE OPERATING ARC		 OUTSIDE STOP HINGE
Leaves move from an open or flat position and stop at a specified angle.

Pin Retention

STAKED PIN
Depressing the leaf or knuckle of one leaf to secure the pin and to prevent axial movement in the knuckle.
BENT PIN
The pin is usually cut longer than the hinge and bent 90 degrees.
This permits easy assembly and disassembly but no security.
SPUN PIN
Cold forming of one or both ends of the pin to a diameter greater than the inside diameter of the knuckle to prevent axial movement.
COINED PIN
One end of the pin is deformed and when driven into the hinge, it wedges in place.
FLUSH PIN
There is no pin retention here except for the friction between the pin and the inside of the curl.
This can vary greatly depending on how tight the hinges have been curled.
SPLINED PIN
A type of pin used in some of our slip joint hinges.
The splined portion of the pin is slightly larger than the inside diameter on the curl of the hinge.
It is press-fit and remains in the leaf for most normal applications.
For applications where greater security is needed, you may want to consider welding the pin into the leaf.
ENDS CRIMPED
The pin is cut shorter than the hinge and centered.
Then both end knuckles of the hinge are crimped to prevent the pin from coming out.
WELDED PIN
One or both ends of the pin are welded to the end curl.
This is a very secure method of pin retention.

Tolerances and Finishes
AVAILABLE FINISH & MATERIAL
Stainless, Standard Finish
Stainless, Bright Finish
Stainless, Satin Finish
Aluminum, Satin and Clear Anodized
Aluminum, satin and Lacquered
Aluminum, Anodized and Brite Dip
Commercial Zinc
Black Zinc 		Bright Brass
Satin Brass
Statuary Bronze
Black Powdercoat
Bright Nickel
Satin (Dull) Nickel
Bright Chrome
Satin (Dull) Chrome

Countersink

COUNTERSUNK HOLES

The hole punched in the sheet metal is designed to leave a minimum .005 wall after the countersink is complete. This will prevent burr formation on the bottom side of the sheet metal. Part of the head will extend below the surface of the sheet metal. We have calculated the hole diameter required for a number of popular screw sizes.

Our standard for the diameter for the top of the countersink is to take the middle of the range for the nominal dimension with a tolerance of plus or minus .010. Any dimension for the top of the countersink from .310 to .330 would be considered within tolerance.

Our standard for the diameter for the top of the countersink is to take the middle of the range for the nominal dimension with a tolerance of plus or minus .015.
82° COUNTERSINK HOLE & TOLERANCES
SCREW SIZE #4 #5 #6 #8 #10 #12 1/4-20
COUNTERSINK DIAMETER 0.216 0.242 0.268 0.320 0.372 0.424 0.492
TOLERANCE: MIN. HEAD DIAMETER (+/- 0.10) 0.207 0.232 0.257 0.308 0.359 0.410 0.477
TOLERANCE: MAX. HEAD DIAMETER (+/- 0.10) 0.225 0.252 0.279 0.332 0.385 0.438 0.507
               
SCREW SIZE #4 #5 #6 #8 #10 #12 1/4-20
MATERIAL THICKNESS Note : holes to be drilled to the following sizes (+/-.005)-Prior to countersink.
0.020 0.1950 0.2220 0.2490 0.3020 0.3550 0.4060 0.4770
0.025 0.1870 0.2130 0.2400 0.2930 0.3460 0.4060 0.4680
0.030 0.1760 0.2010 0.2280 0.2810 0.3340 0.4060 0.4560
0.035 0.1660 0.1960 0.2210 0.2740 0.3280 0.4060 0.4490
0.042 0.1600 0.1870 0.2130 0.2630 0.3170 0.4060 0.4370
0.050 0.1410 0.1700 0.1960 0.2500 0.3030 0.3830 0.4240
0.060 0.1280 0.1520 0.1790 0.2320 0.2850 0.3830 0.4060
0.074 0.1250 0.1280 0.1560 0.2080 0.2630 0.3680 0.3830
0.090 0.1250 0.1280 0.1560 0.1940 0.2500 0.3360 0.3680
0.120 0.1250 0.1280 0.1560 0.1870 0.2130 0.3030 0.3120
0.179 0.1250 0.1280 0.1560 0.1870 0.2130 0.2320 0.3120
0.250 0.1250 0.1280 0.1560 0.1870 0.2130 0.2320 0.3120
               
100° COUNTERSINK HOLE & TOLERANCES
SCREW SIZE #4 #5 #6 #8 #10 #12 1/4-20
COUNTERSINK DIAMETER 0.216 0.242 0.268 0.320 0.372 0.424 0.492
TOLERANCE: MIN. HEAD DIAMETER (+/- 0.15) 0.201 0.227 0.253 0.305 0.357 0.409 0.477
TOLERANCE: MAX. HEAD DIAMETER (+/- 0.15). 0.231 0.257 0.283 0.335 0.387 0.439 0.507
               
SCREW SIZE #4 #5 #6 #8 #10 #12 1/4-20
MATERIAL THICKNESS Note : holes to be drilled to the following sizes (+/-.005)-Prior to countersink.
0.020 0.1870 0.2130 0.2490 0.3020 0.3460 0.4060 0.4770
0.025 0.1870 0.2130 0.2320 0.2930 0.3460 0.4060 0.4680
0.030 0.1760 0.1960 0.2210 0.2740 0.3360 0.3830 0.4560
0.035 0.1600 0.1870 0.2130 0.2630 0.3120 0.3680 0.4370
0.042 0.1410 0.1760 0.1960 0.2500 0.3130 0.3680 0.4240
0.050 0.1250 0.1280 0.1760 0.2320 0.2850 0.3360 0.4060
0.060 0.1250 0.1280 0.1560 0.2130 0.2850 0.3830 0.4060
0.074 0.1250 0.1280 0.1560 0.1870 0.2130 0.2320 0.3120
0.090 0.1250 0.1280 0.1560 0.1870 0.2130 0.2320 0.3120
0.120 0.1250 0.1280 0.1560 0.1870 0.2130 0.2320 0.3120
0.179 0.1250 0.1280 0.1560 0.1870 0.2130 0.2320 0.3120
0.250 0.1250 0.1280 0.1560 0.1870 0.2130 0.2320 0.3120

Conversion Table

METRIC CONVERSIONS
LINEAR
MULTIPLY INCHES BY 25.4 To get millimeters (mm)
MULTIPLY FEET BY 0.3048 To get meters (m)
MULTIPLY INCHES BY 2.54 To get centimeters (cm)
MULTIPLY MILLIMETERS (MM) BY 0.03937 To get inches
MULTIPLY METERS (M) BY 3.281 To get feet
MULTIPLY CENTIMETERS (CM) BY 0.3937 To get inches
     
TORQUE
MULTIPLY INCH-POUNDS BY 0.11298 To get newton-meters (nm)
MULTIPLY FOOT-POUNDS BY 1.3558 To get newton-meters (nm)
MULTIPLY NEWTON-METERS (NM) BY 8.851 To get inch-pounds
MULTIPLY NEWTON-METERS (NM) BY 0.7376 To get foot-pounds
     
FORCE
MULTIPLY POUNDS BY 0.00445 To get kilo newtons (kn)
MULTIPLY KILO NEWTONS (KN) BY 224.72 To get pounds
     
PRESSURE
MULTIPLY PSI BY 0.069 To get bars
MULTIPLY BARS BY 14.5 To get psi

DECIMAL EQUIVALENT OF STANDARD GAUGE SHEET METAL (ALUMINUM AND STEEL)
GAUGE ALUM.
(B & S)		 STEEL
(US STD.)		 GAUGE ALUM.
(B & S)		 STEEL
(US STD.)		 GAUGE ALUM
(B & S)		 STEEL
(US STD.)
10 0.1019 0.1345 17 0.0453 0.0538 24 0.0201 0.0239
11 0.0907 0.1196 18 0.0403 0.0478 25 0.0179 0.0209
12 0.0808 0.1046 19 0.0359 0.0418 26 0.0159 0.0179
13 0.0720 0.0897 20 0.0320 0.0359 27 0.0142 0.0164
14 0.0641 0.0747 21 0.0285 0.0329 28 0.0126 0.0149
15 0.0571 0.0673 22 0.0253 0.0299 29 0.0113 0.0135
16 0.0508 0.0598 23 0.0226 0.0269 30 0.0100 0.0120