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Elevator Bolt ASME B18.5

ASME B18.5 (Current)

Material
Carbon Steel
Property Class
Grade A
Finish
Zinc Plated, Plain
Size range
1/4-20UNC–7/16-14UNC
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Select sizes and quantities — 74 confirmed sizes to ASME B18.5

Material
Grade
Finish
dNominal Diameter (in)lLength (in)TPIThreads Per InchThread SeriesThread ClassdBasic Major Diameter (in)MOQQuantity and inquiry
5/16-18 UNC1.2518UNC2A0.31251000
5/16-18 UNC1.37518UNC2A0.31251000
5/16-18 UNC1.518UNC2A0.31251000
5/16-18 UNC1.7518UNC2A0.31251000
5/16-18 UNC218UNC2A0.31251000
5/16-18 UNC2.2518UNC2A0.31251000
5/16-18 UNC2.518UNC2A0.31251000
5/16-18 UNC2.7518UNC2A0.31251000
5/16-18 UNC318UNC2A0.31251000
5/16-18 UNC3.2518UNC2A0.31251000
5/16-18 UNC3.518UNC2A0.31251000
5/16-18 UNC3.7518UNC2A0.31251000
5/16-18 UNC418UNC2A0.31251000
3/8-16 UNC1.12516UNC2A0.3751000
3/8-16 UNC1.2516UNC2A0.3751000
3/8-16 UNC1.37516UNC2A0.3751000

Showing 16 of 74 sizes

5/16-18 UNC × 1.25 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)1.25
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 1.375 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)1.375
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 1.5 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)1.5
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 1.75 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)1.75
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 2 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)2
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 2.25 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)2.25
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 2.5 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)2.5
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 2.75 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)2.75
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 3 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)3
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 3.25 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)3.25
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 3.5 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)3.5
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 3.75 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)3.75
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

5/16-18 UNC × 4 × 18 × UNC × 2A × 0.3125 × 0.324 × 0.298 × 1.227 × 1.188 × 0.114 × 0.094 × 0.342 × 0.307 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)5/16-18 UNC
lLength (in)4
TPIThreads Per Inch18
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.3125
MOQ1000

3/8-16 UNC × 1.125 × 16 × UNC × 2A × 0.375 × 0.388 × 0.36 × 1.352 × 1.312 × 0.145 × 0.125 × 0.405 × 0.368 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.125
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.375
MOQ1000

3/8-16 UNC × 1.25 × 16 × UNC × 2A × 0.375 × 0.388 × 0.36 × 1.352 × 1.312 × 0.145 × 0.125 × 0.405 × 0.368 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.25
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.375
MOQ1000

3/8-16 UNC × 1.375 × 16 × UNC × 2A × 0.375 × 0.388 × 0.36 × 1.352 × 1.312 × 0.145 × 0.125 × 0.405 × 0.368 × 0.25 × 0.219 × 0.031

dNominal Diameter (in)3/8-16 UNC
lLength (in)1.375
TPIThreads Per Inch16
Thread SeriesUNC
Thread Class2A
dBasic Major Diameter (in)0.375
MOQ1000

Product details

Description
Elevator bolt per ASME B18.5 with a large flat countersunk head and square neck. The wide thin head sits flush with the belt or panel surface so nothing snags on it, and the square neck seats into a square hole to prevent rotation during tightening. Threads are UNC series, class 2A, with sizes from 1/4-20 to 1/2-13. Material is carbon steel Grade A, supplied with zinc plated or plain finish. Minimum order quantities are 1000 pieces for sizes up to 3/8 and 500 pieces for 7/16 and 1/2. For quotation, specify diameter, thread series, finish, and required quantity.
Features
Large flat countersunk head that sits flush with the belt or panel surface · Square neck under the head seats in a square hole to prevent rotation · UNC threads, class 2A, from 1/4-20 to 1/2-13 · Carbon steel Grade A, zinc plated or plain finish · Minimum order quantity 1000 pieces for sizes up to 3/8, 500 pieces for 7/16 and 1/2
Applications
Bucket elevator and conveyor belt splices, Grain handling and agricultural equipment, Belt fastening where the head must sit flush with the running surface, Panel joints that must not snag passing material

Order assurance

Confirmed for the quoted product and order.

Reports & inspection

Agreed in the quotation.

  • EN 10204 3.1 material certificate
  • Dimensional inspection report
  • Certificate of conformity
  • Mechanical test report
  • Chemical analysis report
  • Coating inspection report
  • Batch and lot traceability

Packaging & delivery

Options we supply.

  • Bulk carton packing
  • Small boxes with outer cartons
  • Palletized shipment
  • Fumigation-free pallets
  • Inner poly bags
  • Buyer branding and labels

Product questions

What sizes of Elevator Bolt ASME B18.5 do you supply?

Execution standard: ASME B18.5. The confirmed specification table covers 1–7 diameters and 0.75–5.5 lengths. Use the specification table to select the exact variant required for quotation.

Which materials, grades and finishes can I order?

Material: Carbon Steel; Property class: Grade A; Finish: Zinc Plated, Plain. Availability should be confirmed against the selected specification and order quantity.

Where are these carriage bolts typically used?

Typical applications include Bucket elevator and conveyor belt splices, Grain handling and agricultural equipment, Belt fastening where the head must sit flush with the running surface, Panel joints that must not snag passing material. Final suitability depends on the selected material, grade, finish and operating conditions.

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