A Mounting Magnet is a permanent magnet encased in a steel shell, which is sometimes called a pot or a cup, hence it also called as “Pot Magnet” or “Cup Magnet“. These magnetic assemblies are built with neodymium disc magnets embedded in a steel pot. The steel casing creates a strong vertical magnetic pull force (especially on a flat iron or steel surface), concentrating the magnetic force and directing it to the contact surface. Pot magnets are magnetized on one side and the other side can be fitted with screws, hooks and fasteners to fixed products.
ALB Materials Inc supply several types mounting magnets(A, B, C, D, E, F, G, H and R). Below is the shape and product list.
Type A Mounting Magnets:
Type A Mounting Magnet is a flat mounting magnet with a tapered hole to recess a screw head.
| Item Number | D(mm) | d1(mm) | d2(mm) | H(mm) | Weight(g) | Pull Force(KG) | Pull Force(lbs) |
| ALB-MM-A-16X4.5 | 16 | 3.5 | 6.5 | 4.5 | 6 | 6 | 13.2 |
| ALB-MM-A-16X5 | 16 | 3.5 | 6.5 | 5 | 6.5 | 8 | 17.6 |
| ALB-MM-A-20X5.8 | 20 | 4.5 | 8.6 | 5.8 | 9 | 9 | 19.8 |
| ALB-MM-A-20X7 | 20 | 4.5 | 8.6 | 7 | 12 | 10 | 22 |
| ALB-MM-A-25X6.8 | 25 | 5.5 | 10.4 | 6.8 | 20 | 20 | 44 |
| ALB-MM-A-25X7.8 | 25 | 5.5 | 10.4 | 7.8 | 23 | 22 | 48.4 |
| ALB-MM-A-32X6.8 | 32 | 5.5 | 10.4 | 6.8 | 32 | 34 | 74.8 |
| ALB-MM-A-32X7.8 | 32 | 5.5 | 10.4 | 7.8 | 35 | 38 | 83.6 |
| ALB-MM-A-36X6.8 | 36 | 6.5 | 12 | 6.8 | 47 | 38 | 83.6 |
| ALB-MM-A-36X7.8 | 36 | 6.5 | 12 | 7.8 | 50 | 45 | 99 |
| ALB-MM-A-42X7.8 | 42 | 6.5 | 12 | 7.8 | 60 | 60 | 132 |
| ALB-MM-A-42X8.8 | 42 | 6.5 | 12 | 8.8 | 65 | 62 | 136.4 |
| ALB-MM-A-48X9.6 | 48 | 8.5 | 16 | 9.6 | 95 | 80 | 176 |
| ALB-MM-A-48X11.5 | 48 | 8.5 | 16 | 11.5 | 120 | 85 | 187 |
| ALB-MM-A-60X15 | 60 | 8.5 | 16 | 15 | 243 | 120 | 264 |
| ALB-MM-A-75X18 | 75 | 10.5 | 19 | 18 | 480 | 160 | 352 |
Type B Mounting Magnets:
Type B Mounting Magnet is a flat mounting magnet with a straight hole through the magnet to recess a screw or bolt head.
| Item Number | D(mm) | d1(mm) | d2(mm) | H(mm) | Weight(g) | Pull Force(KG) | Pull Force(lbs) |
| ALB-MM-B-16X4.5 | 16 | 3.5 | 6.5 | 4.5 | 6 | 6 | 13.2 |
| ALB-MM-B-16X5 | 16 | 3.5 | 6.5 | 5 | 6.5 | 8 | 17.6 |
| ALB-MM-B-20X5.8 | 20 | 4.5 | 8.6 | 5.8 | 9 | 9 | 19.8 |
| ALB-MM-B-20X7 | 20 | 4.5 | 8.6 | 7 | 12 | 10 | 22 |
| ALB-MM-B-25X6.8 | 25 | 5.5 | 10.4 | 6.8 | 20 | 20 | 44 |
| ALB-MM-B-25X7.8 | 25 | 5.5 | 10.4 | 7.8 | 23 | 22 | 48.4 |
| ALB-MM-B-32X6.8 | 32 | 5.5 | 10.4 | 6.8 | 32 | 34 | 74.8 |
| ALB-MM-B-32X7.8 | 32 | 5.5 | 10.4 | 7.8 | 35 | 38 | 83.6 |
| ALB-MM-B-36X6.8 | 36 | 6.5 | 12 | 6.8 | 47 | 38 | 83.6 |
| ALB-MM-B-36X7.8 | 36 | 6.5 | 12 | 7.8 | 50 | 45 | 99 |
| ALB-MM-B-42X7.8 | 42 | 6.5 | 12 | 7.8 | 60 | 60 | 132 |
| ALB-MM-B-42X8.8 | 42 | 6.5 | 12 | 8.8 | 65 | 62 | 136.4 |
| ALB-MM-B-48X9.6 | 48 | 8.5 | 16 | 9.6 | 95 | 80 | 176 |
| ALB-MM-B-48X11.5 | 48 | 8.5 | 16 | 11.5 | 120 | 85 | 187 |
| ALB-MM-B-60X15 | 60 | 8.5 | 16 | 15 | 243 | 120 | 264 |
| ALB-MM-B-75X18 | 75 | 10.5 | 19 | 18 | 480 | 160 | 352 |
Type C Mounting Magnets:
Type C Mounting Magnet is a flat mounting magnet with male stud permanently attached to the mount.
| Item Number | D(mm) | M(mm) | H(mm) | h(mm) | Weight(g) | Pull Force(KG) | Pull Force(lbs) |
| ALB-MM-C-10X5 | 10 | 3 | 12 | 5 | 3.6 | 3 | 6.6 |
| ALB-MM-C-12X5 | 12 | 3 | 12 | 5 | 4.6 | 3 | 6.6 |
| ALB-MM-C-16X4.5 | 16 | 4 | 12.5 | 5 | 7 | 6 | 13.2 |
| ALB-MM-C-16X5 | 16 | 4 | 13 | 5 | 8 | 8 | 17.6 |
| ALB-MM-C-20X5.8 | 20 | 4 | 13.5 | 5.8 | 13 | 9 | 19.8 |
| ALB-MM-C-20X7 | 20 | 4 | 14.8 | 7 | 15.6 | 10 | 22 |
| ALB-MM-C-25X6.8 | 25 | 5 | 15.5 | 6.8 | 23 | 20 | 44 |
| ALB-MM-C-25X7.8 | 25 | 5 | 16.5 | 7.8 | 27 | 22 | 48.4 |
| ALB-MM-C-32X6.8 | 32 | 6 | 16.5 | 6.8 | 38 | 34 | 74.8 |
| ALB-MM-C-32X7.8 | 32 | 6 | 17.5 | 7.8 | 40 | 38 | 83.6 |
| ALB-MM-C-36X6.8 | 36 | 6 | 15.5 | 6.8 | 47 | 38 | 83.6 |
| ALB-MM-C-36X7.8 | 36 | 6 | 16.5 | 7.8 | 44 | 45 | 99 |
| ALB-MM-C-42X7.8 | 42 | 6 | 16.5 | 7.8 | 72 | 60 | 132 |
| ALB-MM-C-42X8.8 | 42 | 6 | 17.5 | 8.8 | 82 | 62 | 136.4 |
| ALB-MM-C-48X9.6 | 48 | 8 | 21.5 | 9.6 | 113 | 80 | 176 |
| ALB-MM-C-48X11.5 | 48 | 8 | 23.5 | 11.5 | 142 | 85 | 187 |
| ALB-MM-C-60X15 | 60 | 8 | 27 | 15 | 243 | 120 | 264 |
| ALB-MM-C-75X18 | 75 | 10 | 35 | 18 | 480 | 160 | 352 |
Type D Mounting Magnets:
Type D Mounting Magnet is a flat mounting magnet with a female threaded shaft permanently attached. If you need a magnet to attach to something threaded, this is what you need.
| Item Number | D(mm) | d(mm) | M(mm) | H(mm) | h(mm) | Weight(g) | Pull Force(KG) | Pull Force(lbs) |
| ALB-MM-D-10X5 | 10 | 5 | 3 | 13 | 5 | 3.6 | 3 | 6.6 |
| ALB-MM-D-12X5 | 12 | 5 | 3 | 13 | 5 | 4.6 | 3 | 6.6 |
| ALB-MM-D-16X4.5 | 16 | 6.5 | 4 | 13 | 4.5 | 7 | 6 | 13.2 |
| ALB-MM-D-16X5 | 16 | 6.5 | 4 | 13 | 5 | 8 | 8 | 17.6 |
| ALB-MM-D-20X5.8 | 20 | 6.5 | 4 | 13.5 | 5.8 | 13 | 9 | 19.8 |
| ALB-MM-D-20X7 | 20 | 6.5 | 4 | 14.8 | 7 | 15.6 | 10 | 22 |
| ALB-MM-D-25X6.8 | 25 | 7.5 | 5 | 16.5 | 6.8 | 23 | 20 | 44 |
| ALB-MM-D-25X7.8 | 25 | 7.5 | 5 | 17.5 | 7.8 | 27 | 22 | 48.4 |
| ALB-MM-D-32X6.8 | 32 | 10 | 6 | 16.5 | 6.8 | 38 | 34 | 74.8 |
| ALB-MM-D-32X7.8 | 32 | 10 | 6 | 17.5 | 7.8 | 40 | 38 | 83.6 |
| ALB-MM-D-36X6.8 | 36 | 10 | 6 | 16 | 6.8 | 47 | 38 | 83.6 |
| ALB-MM-D-36X7.8 | 36 | 10 | 6 | 17 | 7.8 | 44 | 45 | 99 |
| ALB-MM-D-42X7.8 | 42 | 10 | 6 | 17 | 7.8 | 72 | 60 | 132 |
| ALB-MM-D-42X8.8 | 42 | 10 | 6 | 18 | 8.8 | 82 | 62 | 136.4 |
| ALB-MM-D-48X9.5 | 48 | 8.5 | 16 | 21.8 | 9.5 | 113 | 80 | 176 |
| ALB-MM-D-48X11.5 | 48 | 8.5 | 16 | 23.8 | 11.5 | 142 | 85 | 187 |
| ALB-MM-D-60X15 | 60 | 8.5 | 16 | 26 | 15 | 228 | 120 | 264 |
| ALB-MM-D-75X18 | 75 | 10.5 | 19 | 33 | 18 | 480 | 160 | 352 |
Type E Mounting Magnets:
Type E Mounting Magnet is Type D Mounting Magnet with a hook attached.
| Item Number | D(mm) | d(mm) | M(mm) | H(mm) | h(mm) | H1(mm) | Weight(g) | Pull Force(KG) | Pull Force(lbs) |
| ALB-MM-E-10X5 | 10 | 5 | 3 | 13 | 5 | 32.5 | 5 | 3 | 6.6 |
| ALB-MM-E-12X5 | 12 | 5 | 3 | 13 | 5 | 32.5 | 6 | 3 | 6.6 |
| ALB-MM-E-16X4.5 | 16 | 6.5 | 4 | 13 | 4.5 | 32 | 10 | 6 | 13.2 |
| ALB-MM-E-16X5 | 16 | 6.5 | 4 | 13 | 5 | 32.5 | 11 | 8 | 17.6 |
| ALB-MM-E-20X5.8 | 20 | 6.5 | 4 | 13.5 | 5.8 | 34 | 15.5 | 9 | 19.8 |
| ALB-MM-E-20X7 | 20 | 6.5 | 4 | 14.8 | 7 | 35 | 19 | 10 | 22 |
| ALB-MM-E-25X6.8 | 25 | 7.5 | 5 | 16.5 | 6.8 | 42.7 | 30 | 20 | 44 |
| ALB-MM-E-25X7.8 | 25 | 7.5 | 5 | 17.5 | 7.8 | 43.7 | 33 | 22 | 48.4 |
| ALB-MM-E-32X6.8 | 32 | 10 | 6 | 16.5 | 6.8 | 46 | 48 | 34 | 74.8 |
| ALB-MM-E-32X7.8 | 32 | 10 | 6 | 17.5 | 7.8 | 47 | 50 | 38 | 83.6 |
| ALB-MM-E-36X6.8 | 36 | 10 | 6 | 16 | 6.8 | 46 | 57 | 38 | 83.6 |
| ALB-MM-E-36X7.8 | 36 | 10 | 6 | 17 | 7.8 | 47 | 55 | 45 | 99 |
| ALB-MM-E-42X7.8 | 42 | 10 | 6 | 17 | 7.8 | 46 | 83 | 60 | 132 |
| ALB-MM-E-42X8.8 | 42 | 10 | 6 | 18 | 8.8 | 47 | 92 | 62 | 136.4 |
| ALB-MM-E-48X9.5 | 48 | 8.5 | 16 | 21.8 | 9.5 | 61.5 | 135 | 80 | 176 |
| ALB-MM-E-48X11.5 | 48 | 8.5 | 16 | 23.8 | 11.5 | 63.5 | 165 | 85 | 187 |
| ALB-MM-E-60X15 | 60 | 8.5 | 16 | 26 | 15 | 67 | 250 | 120 | 264 |
| ALB-MM-E-75X18 | 75 | 10.5 | 19 | 33 | 18 | 77.5 | 550 | 160 | 352 |
Type F Mounting Magnets:
Type F Mounting Magnet is a kind of Hook magnets.
| Item No. | Size | Pull Force(KG) | Pull Force |
|---|---|---|---|
| ALB-MM-F-12 | 1/2″ dia. x 1/2″ thick overall | 4.9 | 10.8 lbs |
| ALB-MM-F-16 | 5/8″ dia. x 5/8″ thick overall | 7.1 | 15.6 lbs |
Type G Mounting Magnets:
Type G Mounting Magnet is Type D Mounting Magnet with an eye hook attached.
| Item Number | D(mm) | d(mm) | M(mm) | H(mm) | h(mm) | H1(mm) | Weight(g) | Pull Force(KG) | Pull Force(lbs) |
| ALB-MM-G-10X5 | 10 | 5 | 3 | 13 | 5 | 32.5 | 5.5 | 3 | 6.6 |
| ALB-MM-G-12X5 | 12 | 5 | 3 | 13 | 5 | 32.5 | 7 | 3 | 6.6 |
| ALB-MM-G-16X4.5 | 16 | 6.5 | 4 | 13 | 4.5 | 32 | 11.5 | 6 | 13.2 |
| ALB-MM-G-16X5 | 16 | 6.5 | 4 | 13 | 5 | 32.5 | 12 | 8 | 17.6 |
| ALB-MM-G-20X5.8 | 20 | 6.5 | 4 | 13.5 | 5.8 | 34 | 17 | 9 | 19.8 |
| ALB-MM-G-20X7 | 20 | 6.5 | 4 | 14.8 | 7 | 35 | 20 | 10 | 22 |
| ALB-MM-G-25X6.8 | 25 | 7.5 | 5 | 16.5 | 6.8 | 42.7 | 30 | 20 | 44 |
| ALB-MM-G-25X7.8 | 25 | 7.5 | 5 | 17.5 | 7.8 | 43.7 | 34 | 22 | 48.4 |
| ALB-MM-G-32X6.8 | 32 | 10 | 6 | 16.5 | 6.8 | 46 | 50 | 34 | 74.8 |
| ALB-MM-G-32X7.8 | 32 | 10 | 6 | 17.5 | 7.8 | 47 | 51 | 38 | 83.6 |
| ALB-MM-G-36X6.8 | 36 | 10 | 6 | 16 | 6.8 | 46 | 60 | 38 | 83.6 |
| ALB-MM-G-36X7.8 | 36 | 10 | 6 | 17 | 7.8 | 47 | 56 | 45 | 99 |
| ALB-MM-G-42X7.8 | 42 | 10 | 6 | 17 | 7.8 | 46 | 85 | 60 | 132 |
| ALB-MM-G-42X8.8 | 42 | 10 | 6 | 18 | 8.8 | 47 | 94 | 62 | 136.4 |
| ALB-MM-G-48X9.5 | 48 | 8.5 | 16 | 21.8 | 9.5 | 61.5 | 140 | 80 | 176 |
| ALB-MM-G-48X11.5 | 48 | 8.5 | 16 | 23.8 | 11.5 | 63.5 | 170 | 85 | 187 |
| ALB-MM-G-60X15 | 60 | 8.5 | 16 | 26 | 15 | 67 | 256 | 120 | 264 |
| ALB-MM-G-75X18 | 75 | 10.5 | 19 | 33 | 18 | 77.5 | 555 | 160 | 352 |
| Item No. | Size | Pull Force(KG) | Pull Force |
|---|---|---|---|
| ALB-MMS-G-A | Diameter = 5/8″ (0.625″ ) Height = 1 1/2″ (1.5″ ) Hook Attachment = #4-40 Threaded Eye Hook | 7.1 | 15.63 lbs |
| ALB-MMS-G-C | Diameter = 3/4″ (0.75″ ) Height = 1 7/10″ (1.70″ ) Hook Attachment = #6-32 Threaded Eye Hook | 10.0 | 22.03 lbs |
| ALB-MMS-G-X0 | Diameter = 1″ (1.00″ ) Height = 2″ (2.0″ ) Hook Attachment = #8-32 Threaded Eye Hook | 18.5 | 40.64 lbs |
| ALB-MMS-G-X4 | Diameter = 1 1/4″ (1.25″ ) Height = 2 1/4″ (2.25″ ) Hook Attachment = #10-32 Threaded Eye Hook | 27.9 | 61.40 lbs |
| ALB-MMS-G-X8 | Diameter = 1 1/2″ (1.50″ ) Height = 2 1/4″ (2.25″ ) Hook Attachment = #10-32 Threaded Eye Hook | 43.5 | 95.78 lbs |
| ALB-MMS-G-XC | Diameter = 1 3/4″ (1.75″ ) Height = 2 4/5″ (2.80″ ) Hook Attachment = 1/4″ -20 Threaded Eye Hook | 57.0 | 125.4 lbs |
| ALB-MMS-G-Y0 | Diameter = 2″ (2.00″ ) Height = 2 9/10″ (2.90″ ) Hook Attachment = 1/4″ -20 Threaded Eye Hook | 78.6 | 173.0 lbs |
| ALB-MMS-G-Y8 | Diameter = 2 1/2″ (2.50″ ) Height = 4 1/4″ (4.25″ ) Hook Attachment = 3/8″ -16 Threaded Eye Hook | 117.8 | 259.1 lbs |
| ALB-MMS-G-Z0 | Diameter = 3″ (3.00″ ) Height = 4 3/8″ (4.375″ ) Hook Attachment = 3/8″ -16 Threaded Eye Hook | 160.2 | 352.4 lbs |
Type H Mounting Magnets:
Type H Mounting Magnet is a flat mounting magnet with an internal thread in the center.
| Item No. | Size | Pull Force(KG) | Pull Force |
|---|---|---|---|
| ALB-MMS-H-A | Diameter = 5/8″ (0.625″ ) Internal Thread Size = #4-40 UNC 2B Height = 3/16″ (0.187″ ) | 4.3 | 9.45 lbs |
| ALB-MMS-H-C | Diameter = 3/4″ (0.750″ ) Internal Thread Size = #6-32 UNC 2B Height = 1/4″ (0.250″ ) | 7.8 | 17.09 lbs |
| ALB-MMS-H-X0 | Diameter = 1″ (1.00″ ) Internal Thread Size = #8-32 UNC 2B Height = 1/4″ (0.250″ ) | 17.2 | 37.73 lbs |
| ALB-MMS-H-X4 | Diameter = 1 1/4″ (1.25″ ) Internal Thread Size = #10-32 UNF 2B Height = 3/8″ (0.375″ ) | 30.2 | 66.38 lbs |
| ALB-MMS-H-X8 | Diameter = 1 1/2″ (1.5″ ) Internal Thread Size = #10-32 UNF 2B Height = 3/8″ (0.375″ ) | 47.1 | 103.6 lbs |
| ALB-MMS-H-XC | Diameter = 1 3/4″ (1.75″ ) Internal Thread Size = 1/4″ -20 UNC 2B Height = 3/8″ (0.375″ ) | 64.6 | 142.05 lbs |
| ALB-MMS-H-Y0 | Diameter = 2″ (2.00″ ) Internal Thread Size = 1/4″ -20 UNC 2B Height = 1/2″ (0.5″ ) | 86.4 | 190.0 lbs |
| ALB-MMS-H-Y8 | Diameter = 2 1/2″ (2.50″ ) Internal Thread Size = 3/8″ -16 UNC 2B Height = 5/8″ (0.625″ ) | 133.2 | 293.1 lbs |
| ALB-MMS-H-Z0 | Diameter = 3″ (3.00″ ) Internal Thread Size = 3/8″ -16 UNC 2B Height = 3/4″ (0.75″ ) | 180.2 | 396.4 lbs |
Type R Mounting Magnets(Rectangular Mounting Magnets):
Type R Mounting Magnet also called as Rectangular Mounting Magnet. It is a rectangular, or bar shaped Neodymium Mounting Magnet with two tapered holes to recess screw heads.
| Item No. | Size | Pull Force(KG) | Pull Force |
|---|---|---|---|
| ALB-MMR-A-X8 | Length= 1 1/2″ (1.5″ ) Width= 9/16″ (0.563″ ) Height= 3/16″ (0.188″ ) Holes sized for #4 flat-head screws | 12.2 | 26.75 lbs |
| ALB-MMR-A-XC | Length= 1 3/4″ (1.75″ ) Width= 3/4″ (0.75″ ) Height= 5/16″ (0.313″ ) Holes sized for #6 flat-head screws | 24.6 | 54.14 lbs |
| ALB-MMR-A-Y8 | Length= 2 1/2″ (2.50″ ) Width= 3/4″ (0.75″ ) Height= 3/8″ (0.375″ ) Holes sized for #8 flat-head screws | 38.4 | 84.39 lbs |
| ALB-MMR-A-ZC | Length= 3 3/4″ (3.75″ ) Width= 1″ (1.00″ ) Height= 3/8″ (0.375″ ) Holes sized for #10 flat-head screws | 69.0 | 151.8 lbs |
| ALB-MMR-A-ZX8 | Length= 4 1/2″ (4.50″ ) Width= 1 1/2″ (1.50″ ) Height= 1/2″ (0.5″ ) Holes sized for 1/4″ flat-head screws | 118.4 | 260.5 lbs |
Threads Used in Mounting Magnets:
UNC/UNF Threads
UNC and UNF – Unified Inch Screw Threads
ANSI/ASME B1.1 Unified National Thread – UNC Coarse series and UNF Fine series
UNC – Unified National Coarse Thread – comparable with the ISO metric thread
UNF – Unified National Fine Thread
Female and Male UNC/UNF threads are both parallel
The UNC/UNF flank angle is 60°
UNC – Unified Coarse Threads
UNC threads according ANSI B1.1:
| Major Diameter (in) | Threads per inch (tpi) | Major Diameter | Tap Drill Size (mm) | Pitch (mm) | |
|---|---|---|---|---|---|
| (in) | (mm) | ||||
| #1 – 64 | 64 | 0.073 | 1.854 | 1.50 | 0.397 |
| #2 – 56 | 56 | 0.086 | 2.184 | 1.80 | 0.453 |
| #3 – 48 | 48 | 0.099 | 2.515 | 2.10 | 0.529 |
| #4 – 40 | 40 | 0.112 | 2.845 | 2.35 | 0.635 |
| #5 – 40 | 40 | 0.125 | 3.175 | 2.65 | 0.635 |
| #6 – 32 | 32 | 0.138 | 3.505 | 2.85 | 0.794 |
| #8 – 32 | 32 | 0.164 | 4.166 | 3.50 | 0.794 |
| #10 – 24 | 24 | 0.190 | 4.826 | 4.00 | 1.058 |
| #12 – 24 | 24 | 0.216 | 5.486 | 4.65 | 1.058 |
| 1/4″ – 20 | 20 | 0.250 | 6.350 | 5.35 | 1.270 |
| 5/16″ – 18 | 18 | 0.313 | 7.938 | 6.80 | 1.411 |
| 3/8″ – 16 | 16 | 0.375 | 9.525 | 8.25 | 1.587 |
| 7/16″ – 14 | 14 | 0.438 | 11.112 | 9.65 | 1.814 |
| 1/2″ – 13 | 13 | 0.500 | 12.700 | 11.15 | 1.954 |
| 9/16″ – 12 | 12 | 0.563 | 14.288 | 12.60 | 2.117 |
| 5/8″ – 11 | 11 | 0.625 | 15.875 | 14.05 | 2.309 |
| 3/4″ – 10 | 10 | 0.750 | 19.050 | 17.00 | 2.540 |
| 7/8″ – 9 | 9 | 0.875 | 22.225 | 20.00 | 2.822 |
| 1″ – 8 | 8 | 1.000 | 25.400 | 22.85 | 3.175 |
| 1 1/8″ – 7 | 7 | 1.125 | 28.575 | 25.65 | 3.628 |
| 1 1/4″ – 7 | 7 | 1.250 | 31.750 | 28.85 | 3.628 |
| 1 3/8″ – 6 | 6 | 1.375 | 34.925 | 31.55 | 4.233 |
| 1 1/2″ – 6 | 6 | 1.500 | 38.100 | 34.70 | 4.233 |
| 1 3/4″ – 5 | 5 | 1.750 | 44.450 | 40.40 | 5.080 |
| 2″ – 4 1/2 | 4 1/2 | 2.000 | 50.800 | 46.30 | 5.644 |
| 2 1/4″ – 4 1/2 | 4 1/2 | 2.250 | 57.150 | 52.65 | 5.644 |
| 2 1/2″ – 4 | 4 | 2.500 | 63.500 | 58.50 | 6.350 |
| 2 3/4″ – 4 | 4 | 2.750 | 69.850 | 64.75 | 6.350 |
| 3″ – 4 | 4 | 3.000 | 76.200 | 71.10 | 6.350 |
| 3 1/4″ – 4 | 4 | 3.250 | 82.550 | 77.45 | 6.350 |
| 3 1/2″ – 4 | 4 | 3.500 | 88.900 | 83.80 | 6.350 |
| 3 3/4″ – 4 | 4 | 3.750 | 95.250 | 90.15 | 6.350 |
| 4″ – 4 | 4 | 4.000 | 101.600 | 96.50 | 6.350 |
UNF – Unified National Fine Threads
UNF threads ANSI B1.1:
| Major Diameter (in) | Threads per inch (tpi) | Major Diameter | Tap Drill Size (mm) | Pitch (mm) | |
|---|---|---|---|---|---|
| (in) | (mm) | ||||
| #0 – 80 | 80 | 0.060 | 1.524 | 1.25 | 0.317 |
| #1 – 72 | 72 | 0.073 | 1.854 | 1.55 | 0.353 |
| #2 – 64 | 64 | 0.086 | 2.184 | 1.90 | 0.397 |
| #3 – 56 | 56 | 0.099 | 2.515 | 2.15 | 0.453 |
| #4 – 48 | 48 | 0.112 | 2.845 | 2.40 | 0.529 |
| #5 – 44 | 44 | 0.125 | 3.175 | 2.70 | 0.577 |
| #6 – 40 | 40 | 0.138 | 3.505 | 2.95 | 0.635 |
| #8 – 36 | 36 | 0.164 | 4.166 | 3.50 | 0.705 |
| #10 – 32 | 32 | 0.190 | 4.826 | 4.10 | 0.794 |
| #12 – 28 | 28 | 0.216 | 5.486 | 4.70 | 0.907 |
| 1/4″ – 28 | 28 | 0.250 | 6.350 | 5.50 | 0.907 |
| 5/16″ – 24 | 24 | 0.313 | 7.938 | 6.90 | 1.058 |
| 3/8″ – 24 | 24 | 0.375 | 9.525 | 8.50 | 1.058 |
| 7/16″ – 20 | 20 | 0.438 | 11.112 | 9.90 | 1.270 |
| 1/2″ – 20 | 20 | 0.500 | 12.700 | 11.50 | 1.270 |
| 9/16″ – 18 | 18 | 0.563 | 14.288 | 12.90 | 1.411 |
| 5/8″ – 18 | 18 | 0.625 | 15.875 | 14.50 | 1.411 |
| 3/4″ – 16 | 16 | 0.750 | 19.050 | 17.50 | 1.587 |
| 7/8″ – 14 | 14 | 0.875 | 22.225 | 20.40 | 1.814 |
| 1″ – 12 | 12 | 1.000 | 25.400 | 23.25 | 2.117 |
| 1 1/8″ – 12 | 12 | 1.125 | 28.575 | 26.50 | 2.117 |
| 1 1/4″ – 12 | 12 | 1.250 | 31.750 | 29.50 | 2.117 |
| 1 3/8″ – 12 | 12 | 1.375 | 34.925 | 32.75 | 2.117 |
| 1 1/2″ – 12 | 12 | 1.500 | 38.100 | 36.00 | 2.117 |
Metric Coarse Thread
According to ISO965
All Dimensions in mm unless otherwise stated.
Tolerances: Male Thread 6g Female Thread: 6h
The “M” designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres (e.g., an M6 screw has a nominal outer diameter of 6 millimetres).
| Thread | Major Diameter | Pitch | Pitch Diameter | Minor Diameter Male Thread | Minor Diameter Female Thread |
|---|---|---|---|---|---|
| M1 | 1.0 | 0.25 | 0.838 | 0.693 | 0.729 |
| M1.1 | 1.1 | 0.25 | 0.938 | 0.793 | 0.829 |
| M1.2 | 1.2 | 0.25 | 1.038 | 0.893 | 0.929 |
| M1.4 | 1.4 | 0.30 | 1.205 | 1.032 | 1.075 |
| M1.6 | 1.6 | 0.35 | 1.373 | 1.171 | 1.221 |
| M1.8 | 1.8 | 0.35 | 1.573 | 1.371 | 1.421 |
| M2 | 2.0 | 0.40 | 1.740 | 1.509 | 1.567 |
| M2.2 | 2.2 | 0.45 | 1.908 | 1.648 | 1.713 |
| M2.5 | 2.5 | 0.45 | 2.208 | 1.948 | 2.013 |
| M3 | 3.0 | 0.50 | 2.675 | 2.387 | 2.459 |
| M3.5 | 3.5 | 0.60 | 3.110 | 2.764 | 2.850 |
| M4 | 4.0 | 0.70 | 3.545 | 3.141 | 3.242 |
| M4.5 | 4.5 | 0.75 | 4.013 | 3.580 | 3.688 |
| M5 | 5.0 | 0.80 | 4.480 | 4.019 | 4.134 |
| M6 | 6.0 | 1.00 | 5.350 | 4.773 | 4.917 |
| M7 | 7.0 | 1.00 | 6.350 | 5.773 | 5.917 |
| M8 | 8.0 | 1.25 | 7.188 | 6.466 | 6.647 |
| M9 | 9.0 | 1.25 | 8.188 | 7.466 | 7.647 |
| M10 | 10.0 | 1.50 | 9.026 | 8.160 | 8.376 |
| M11 | 11.0 | 1.50 | 10.026 | 9.160 | 9.376 |
| M12 | 12.0 | 1.75 | 10.863 | 9.853 | 10.106 |
| M14 | 14.0 | 2.00 | 12.701 | 11.546 | 11.835 |
| M16 | 16.0 | 2.00 | 14.701 | 13.546 | 13.835 |
| M18 | 18.0 | 2.50 | 16.376 | 14.933 | 15.394 |
| M20 | 20.0 | 2.50 | 18.376 | 16.933 | 17.294 |
| M22 | 22.0 | 2.50 | 20.376 | 18.933 | 19.294 |
| M24 | 24.0 | 3.00 | 22.051 | 20.319 | 20.752 |
| M27 | 27.0 | 3.00 | 25.051 | 23.319 | 23.752 |
| M30 | 30.0 | 3.50 | 27.727 | 25.706 | 26.211 |
| M33 | 33.0 | 3.50 | 30.727 | 28.706 | 29.211 |
| M36 | 36.0 | 4.00 | 33.402 | 31.093 | 31.670 |
| M39 | 39.0 | 4.00 | 36.402 | 34.093 | 34.670 |
| M42 | 42.0 | 4.50 | 39.077 | 36.479 | 37.129 |
| M45 | 45.0 | 4.50 | 42.077 | 39.479 | 40.129 |
| M48 | 48.0 | 5.00 | 44.752 | 41.866 | 42.857 |
Countersunk Holes Used in Magnets
Counterbored Holes Dimensions (metric)
METRIC SOCKET-HEAD CAP SCREWS
| SCREW DIA | COUNTERBORE DIA | COUNTERBORE DEPTH | COUNTERSINK DIA | CLEARANCE DIA (NORMAL FIT) | CLEARANCE DIA (CLOSE FIT) |
|---|---|---|---|---|---|
| M1.6 | 3.50mm | 1.6mm | 2.0mm | 1.95mm | 1.80mm |
| M2 | 4.40mm | 2mm | 2.6mm | 2.40mm | 2.20mm |
| M2.5 | 5.40mm | 2.5mm | 3.1mm | 3.00mm | 2.70mm |
| M3 | 6.50mm | 3mm | 3.6mm | 3.70mm | 3.40mm |
| M4 | 8.25mm | 4mm | 4.7mm | 4.80mm | 4.40mm |
| M5 | 9.75mm | 5mm | 5.7mm | 5.80mm | 5.40mm |
| M6 | 11.20mm | 6mm | 6.8mm | 6.80mm | 6.40mm |
| M8 | 14.50mm | 8mm | 9.2mm | 8.80mm | 8.40mm |
| M10 | 17.50mm | 10mm | 11.2mm | 10.80mm | 10.50mm |
| M12 | 19.50mm | 12mm | 14.2mm | 13.00mm | 12.50mm |
| M14 | 22.50mm | 14mm | 16.2mm | 15.00mm | 14.50mm |
| M16 | 25.50mm | 16mm | 18.2mm | 17.00mm | 16.50mm |
| M20 | 31.50mm | 20mm | 22.4mm | 21.00mm | 20.50mm |
| M24 | 37.50mm | 24mm | 26.4mm | 25.00mm | 24.50mm |
| M30 | 47.50mm | 30mm | 33.4mm | 31.50mm | 31.00mm |
| M36 | 56.50mm | 36mm | 39.4mm | 37.50mm | 37.00mm |
| M42 | 66.00mm | 42mm | 45.6mm | 44.00mm | 43.00mm |
| M48 | 75.00mm | 28mm | 52.6mm | 50.00mm | 49.00mm |