American Made Precision Hinge Manufacturer
  American Made Quality Latch Manufacturer

Lift Off Hinges Series 3500 Single Pin Hinge Slip joint hinges or lift off butt hinges are used for quick and easy door removal. Single pin lift off hinges are available with bullet tips on request. To Order Specify material and finish: 1 Housing and keeper—anodized alum alloy. Pin—zinc plated steel. 2 Housing, keeper and pin—steel, no finish. 3 Housing, keeper and pin—zinc plated steel. 4 Housing, keeper and pin—stainless steel. Specify assembly number. (see table) Specify right or left-hand. (right-hand shown on drawing) Specify complete assembly, housing only or keeper only. Assembly Number L Length W Width P Pin Dia. T Thickness 1 1.0 1.0 .125 .048 2 1.5 1.0 .125 .048 3 1.5 1.25 .125 .048 4 2.0 1.5 .125 .048 5 2.5 1.5 .125 .048 6 2.0 1.25 .125 .060 7 2.0 1.5 .125 .060 8 2.5 1.5 .125 .060 9 3.0 2.0 .125 .060 10 4.0 3.0 .125 .060 11 2.0 1.5 .187 .075 12 2.5 2.0 .187 .075 13 3.0 2.0 .187 .075 14 4.0 3.0 .187 .075 15 2.0 1.5 .187 .090 16 2.5 1.5 .187 .090 17 2.5 2.0 .187 .090 18 3.0 2.0 .250 .090 19 3.0 3.0 .250 .090 20 4.0 4.0 .250 .090 21 4.0 3.0 .250 .105 22 4.0 4.0 .250 .105 23 5.0 5.0 .250 .105 24 3.0 2.5 .250 .120 Dimensions are in inches. Prototype Hinges, Specialty Hinges If you need a small quantity of hinges–or have a special order that requires custom engineering to fit your project specifications–you’ve come to the right place. At Knuth Hinge Company, a precision hinge manufacturer, no job is too small. You will receive the personalized attention of our expert staff and engineers with every order. At Knuth Hinge Company, you get exactly what you need when you need it–without extra cost or down time.   Precision Hinge Manufacturer As a domestic hinge manufacturer, we make our own tooling and produce a wide variety of hinge types and sizes, including: ● Continuous Hinges ● Butt Hinges ● Knife Hinges ● Strap and "T" Hinges ● Spring Loaded Hinges ● Slip Joint Hinges (Lift-off Hinges and Flag Hinges) Continuous Hinges Knuth hinges are known for their quality and reliability because of our unique manufacturing process and ability to produce close tolerance parts. Only Knuth Hinge punches the hole or piercing patterns into the hinge after forming to maintain ±.005 inch position tolerance. Total end play and side play can also be held to this same exacting tolerance. Accurate alignment is provided, while uniform strength is maintained throughout the length of the hinge, creating smooth pivotal action. We can custom manufacture these precision hinges with: ● Notched or radius-cut corners ● Slots, holes, countersunk holes, key slots, and more ● A variety of lengths, widths and finishes ● Springs (or without, if needed) In addition Knuth hinges can also be manufactured to limit the travel of the leaves to a specific angle. While standard assembly continuous hinge leaves lay flat in the open position, other options include: ● Reverse assembly ● One leaf swaged ● Both leaves swaged ● One leaf bent ● Offset   Part Number L Length W Width P Pin Dia. T Thickness T Knuckle 20-106-093-5 6 or 8' 1.062 .093 .040 .500 20-150-093-5 6 or 8' 1.500 .093 .040 .500 18-125-120-5 6 or 8' 1.250 .120 .050 .500 18-200-120-5 6 or 8' 2.000 .120 .050 .500 16-125-120-5 6 or 8' 1.250 .120 .060 .500 16-200-120-5 6 or 8' 2.000 .120 .060 .500 16-125-187-5 6 or 8' 1.250 .187 .060 .500 16-150-187-5 6 or 8' 1.500 .187 .060 .500 Note: Specify material type when ordering. Also, specify length using the following example: 20-106-093-5-72 for a six foot length. Dimensions are in inches. Butt Hinges Series 4500 Knuth butt hinges are available in a variety of materials, gauges, pin diameters and knuckle lengths with loose or tight pins. Pin retaining can be: ● Staked ● Brazed ● Welded ● Knurled ● Peened   Corners can be flush cut or formed with a radius. Our butt hinges can be spring loaded to hold the door in either the open or closed position. Spring release butt hinges are available with either single or double bolts. To Order Specify material: 1 Aluminum 2 Steel 3 Zinc plated steel 4 Stainless steel Specify assembly number:  (see table) Specify flush pin style: 1 Staked 2 Welded 3 Brazed Assembly Number L Length W Width P Pin Dia. T Thickness 1 1.0 1.0 .093 .035 2 1.5 1.5 .093 .035 3 1.5 1.5 .125 .048 4 2.0 2.0 .125 .048 5 2.0 2.0 .125 .060 6 3.0 3.0 .125 .060 7 4.0 4.0 .125 .060 8 2.5 2.5 .187 .075 9 3.0 3.0 .187 .075 10 4.0 4.0 .187 .075 11 2.5 2.5 .187 .090 12 3.5 3.5 .187 .090 13 4.5 4.5 .187 .090 14 2.0 2.0 .250 .105 15 3.0 3.0 .250 .105 16 4.0 4.0 .250 .105 17 5.0 5.0 .250 .105 18 3.0 3.0 .250 .120 19 4.0 4.0 .250 .120 20 5.0 5.0 .250 .120 21 6.0 6.0 .250 .120 Dimensions are in inches. Series 4000 Flag Hinge To order see Series 3500 instructions above. Assembly Number L Length W Width P Pin Dia. T Thickness 1 1.5 1.0 .125 .048 2 2.0 1.25 .125 .048 3 2.0 1.5 .125 .048 4 2.5 1.5 .125 .048 5 3.0 2.0 .125 .048 6 1.5 1.0 .125 .060 7 2.0 1.25 .125 .060 8 2.0 1.5 .125 .060 9 2.0 2.0 .125 .060 10 2.5 2.0 .125 .060 11 3.0 2.0 .125 .060 12 2.0 1.5 .187 .075 13 2.5 2.0 .187 .075 14 3.0 2.0 .187 .075 15 4.0 3.0 .187 .075 16 2.5 2.0 .187 .090 17 3.0 2.0 .187 .090 18 3.0 3.0 .250 .090 19 4.0 3.0 .250 .090 20 4.0 3.0 .250 .105 21 4.0 4.0 .250 .105 22 4.0 3.0 .250 .120 23 4.0 4.0 .250 .120 24 5.0 4.0 .250 .120 Dimensions are in inches. Custom Hinges Made to Your Specifications While all of our hinges are most commonly made from cold roll, stainless steel or aluminum, we can produce hinges from virtually any metal or alloy. A variety of finishes are also available. We also provide the following flush pin styles: ●  Staked                      ●  Welded                    ●  Brazed If you are looking for personalized attention from your hinge manufacturer–whatever size your order is–call Knuth Hinge for your next project. If we can’t help you, we promise to direct you to another hinge manufacturer who can. Call today and speak with a “live” person, or send us an RFQ and we promise to respond within 24 hours.