Hollow Bar Types
- Threaded hollow bar systems (commercial grade)
- Threaded hollow bar couplers
- Threaded hollow bar nuts
- Hollow bar centralizers
- Bearing Plates
- Bits
- Hollow bar bits, adapters, and accessories (commercial-grade accessories)
See how NPP has the Hollow Bar you need
NPP Hollow Bar Inventory Breakdown
Threaded hollow bar systems (commercial grade)
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Bar designations shown: 30/11, 40/20, 40/16, 52/26, 76N, 76S, 103/78, 103/51.
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Specs listed for each bar type: Nominal outer diameter; average inner diameter; cross‑sectional area; ultimate load (kips/kN); yield load (kips/kN); approximate major thread diameter; nominal/normal weight (lbs/ft, kg/m).
Threaded hollow bar couplers
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Bar designations shown: 30/11, 40/20, 40/16, 52/26, 76N, 76S, 103.
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Specs listed for each coupler type: OD (in/mm); L (length, in/mm); weight (lbs/kg).
Threaded hollow bar nuts
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Bar designations shown: 30/11, 40/20, 40/16, 52/26, 76N, 76S, 103 (nuts also labeled by series: 30, 40, 52, 76, 103).
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Specs listed for each nut type: A (in/mm); B (in/mm); weight (lbs/kg).
Hollow bar centralizers
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Sizes shown: R29, R56; includes a “52 Centralizer” drawing/callout.
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Material noted: Cast steel.
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Specs shown (in the centralizer table/callouts): Dimensions and weights are provided in in/mm and lbs/kg in the flyer.
Hollow bar bits, adapters, and accessories (commercial-grade accessories)
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Carbide cross, steel cross cut, and button bits: Listed with applicable bar sizes and size options (in/mm) plus weight per unit (lbs/kg per unit).
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Bit types called out with drawings: Cross-cut carbide bit; stepped clay bit; carbide button bit (example shown for 76).
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Adapters: Adapter drawing shown (example: “40 to R‑51 Adapter,” with 40 I.D. and R‑51 O.D. noted).
