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How long of an elevator bolt do I need? |
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When installing buckets on an elevator belt, use this simple formula: |
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(belt thickness + bucket back thickness + washer thickness + nut thickness + 1/4 inch) |
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How thick of a belt do I need in order to use fanged bolts? |
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The table below should be referenced to help determine proper belt thickness. Neither the fangs or squared shoulder |
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should be exposed or protrude through the belt after proper tightening. |
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| BELT THICKNESS GUIDE |
| Bolt Size |
Fang Height |
Squared Shoulder Height |
| 1/4" |
3/16" |
7/32" |
| 5/16" |
1/4" |
1/4" |
| 3/8" |
9/32" |
1/4" |
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What grade are 4B elevator bolts? |
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4B elevator bolts meet or exceed SAE Grade 2 / ISO Grade 5.8 standards. The bolt grade guide below is for bolt |
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diameters of 1/4" (6 mm) to 1/2" (12 mm): |
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| BOLT GRADE GUIDE |
| SAE Grade |
ISO Grade |
Min. Tensile Strength (psi) |
| 2 |
5.8 |
74,000 |
| 5 |
8.8 |
120,000 |
| 8 |
10.9 |
150,000 |
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What torque setting should I use? |
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An ideal installation will result in the elevator bolt head fitting snuggly just below the surface of the belt after tightening |
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(Image B). However, never exceed the maximum recommended torque as shown in the tables below: |
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| MAXIMUM RECOMMENDED TORQUE FOR 4B ELEVATOR BOLTS SAE GRADE 2 OR 302 STAINLESS STEEL |
| Bolt Diameter |
in. lbs. |
ft. lbs. |
Nm |
| 1/4" |
72 |
6 |
8 |
| 5/16" |
156 |
13 |
18 |
| 3/8" |
276 |
23 |
31 |
| 1/2" |
684 |
57 |
77 |
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| MAXIMUM RECOMMENDED TORQUE FOR 4B ELEVATOR BOLTS METRIC ISO GRADE 5.8 |
| Bolt Diameter |
in. lbs. |
ft. lbs. |
Nm |
| M6 |
72 |
6 |
8 |
| M7 |
115 |
10 |
13 |
| M8 |
168 |
14 |
19 |
| M10 |
336 |
28 |
38 |
| M12 |
588 |
49 |
66 |
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What if the tolerance on bolt length? |
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See table below for specific tolerances. |
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| TOLERANCE ON BOLT LENGHT |
| Nominal Length |
No. 10
thru
3/8" |
7/16
and 1/2" |
9/16"
thru 3/4" |
7/8"
and 1" |
1-1/8"
thru 1-1/2" |
| Up to 1" |
+0.02
-0.03 |
+0.02
-0.03 |
+0.02
-0.03 |
----
---- |
----
---- |
| Over 1" to 2-1/2" |
+0.02
-0.04 |
+0.04
-0.05 |
+0.06
-0.08 |
+0.08
-0.10 |
+0.12
-0.12 |
| Over 2-1/2" to 4" |
+0.04
-0.06 |
+0.06
-0.08 |
+0.08
-0.10 |
+0.10
-0.14 |
+0.16
-0.16 |
| Over 4" to 6" |
+0.06
-0.10 |
+0.08
-0.10 |
+0.10
-0.10 |
+0.12
-0.16 |
+0.18
-0.18 |
| Over 6" |
+0.10
-0.18 |
+0.12
-0.18 |
+0.14
-0.18 |
+0.16
-0.20 |
+0.22
-0.22 |
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How do you install an elevator bolt? |
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The head of the elevator bolt should lie against the inside surface of the elevator belt with the nuts and washers on |
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the inside of the elevator bucket (Image A). An ideal installation will result in the elevator bolt head fitting snuggly |
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just below the surface of the elevator belt (Image B). |
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IMAGE A |
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IMAGE B |
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Fanged bolts are a little more unique than other elevator bolts. Install fanged bolts with fang tips in-line across the |
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width of the belt (Image C). Placing the fangs in such a manner minimizes stresses caused by the flat head going |
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around the curved pulley. Set the fangs into the belt cover by tapping them with a mallet. Once the bolt is tightened, the |
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fangs will draw up into the belt and the head will seat properly as show above (Image B). |
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IMAGE C |
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My elevator bucket has recessed (curved) holes, can I use a flat washer? |
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Domed washers are recommended for recessed holes. |
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Can nylon threaded lock nuts (nylock) be used more than once? |
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It is not recommended to re-use nylock nuts. Also, if temperatures reach 250° F or higher, nylock nuts should not |
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be used. |
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How can I prevent stainless steel bolts and nuts from locking up (galling)? |
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Stainless steel fasteners are susceptible to freezing up or locking up (galling). During the tightening process, pressure |
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builds between the two contacting thread surfaces and breaks down the protective oxide coatings. Without the oxide |
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coating, there is an increase in friction between the threads which can generate enough heat to fuse the nut and bolt |
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together. The following actions can help prevent galling - |
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1 - Slow down installation RPM speed |
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2 - Use thread lubrication such as PTFE based coatings |
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3 - Use different stainless alloy grades for the bolt and nut |
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4 - Use regular hex nuts and lock washers instead of nylon insert lock nuts |
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Do you have any maintenance recommendations? |
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After initial installation, it is recommended that the bucket elevator be run for approximately four hours. After which the |
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bolts should be re-tightened to ensure that there are no loose parts. Periodic inspections are always recommended to |
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check for any issues that may occur during the life of the elevator, including checks for loose or damaged elevator bolts. |
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What is the maximum temperature for zinc plated bolts and nylon threaded lock nuts (nylock)? |
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Zinc plated bolts can be used on applications where the temperature is less than 390° F (200° C). Zinc plated nylon |
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threaded lock nuts (nylock) have a maximum service temperature of 250° F (120° C). |
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