Underreamer Gauge (URG) 2018-02-24T12:11:32+00:00

Project Description

Underreamer Gauge (URG)

The Holte URG® (Underreamer Guard) Underreamer has an extendible arm bit and is considered superior to a one-sided UR because three (3) to four (4) arms extend to ream a full gauge (360 degree) hole. The underreamers which swing out on only one side drill slower and not always straight.

This bit design was developed at Holte Manufacturing while researching faster ways to drill large diameter holes. Because there is bit surface reaming the full gauge of the hole, this bit wears much better than an eccentric style bit which only reams with about a 50 degree portion of the hole.

The Full Gauge UR resembles a conventional hole opener. The extendible arms cover 360 degrees of the hole circumference, minus three air slots, similar in size to a conventional bit. We offer URG Overburden Systems between 10″ – 42″ configured with three (3) or four (4) arms for both conventional and reverse circulation drilling.

UnderReamers (URG) Conventional 
DescriptionParts #:
10” Holte URG Complete System (Driver/Bit/Arms)050110
10” Holte URG Driver100308
10” Holte URG Pilot Bit100309
10” Holte URG Wing Set100310
10" URG Single Arm100890
12” Holte URG Complete System (Driver/Bit/Arms)050112
12” Holte URG Driver100311
12” Holte URG Pilot Bit100312
12” Holte URG Wing Set100313
12” Holte URG Single Arm100891
13” Holte URG Complete System (Driver/Bit/Arms)050113
13” Holte URG Driver100314
13” Holte URG Pilot Bit100315
13” Holte URG Wing Set100316
13” Holte URG Single Arm100892
14” Holte URG Complete System (Driver/Bit/Arms)050114
14" Holte URG Driver100317
14" Holte URG Pilot Bit100318
14" Holte URG Wing Set100319
14” Holte URG Single Arm100893
16” Holte URG Complete System (Driver/Bit/Arms)050116
16” Holte URG Driver100320
16" Holte URG Pilot Bit100321
16” Holte URG Wing Set100322
16" Holte URG Single Arm100894
18" Holte URG Complete System (Drive/Bit/Arms)050118
18” Holte URG Drive100323
18" Holte URG Pilot Bit100324
18" Holte URG Wing Set100325
18” Holte URG Single Arm100895
20” Holte URG Complete System (Driver/Bit/Arms)050120
20” Holte URG Driver100326
20" Holte URG Pilot Bit100327
20" Holte URG Wing Set100328
20" Holte URG Single Arm100896
22” Holte URG Complete System (Driver/Bit/Arms)050122
22” Holte URG Driver100329
22" Holte URG Pilot Bit100330
22" Holte URG Wing Set100331
22” Holte URG Single Arm100897
24” Holte URG Complete System (Driver/Bit/Arms)050124
24” Holte URG Driver100332
24" Holte URG Pilot Bit100333
24" Holte URG Wing Set100334
24” Holte URG Single Arm100898
26” Holte URG Complete System (Driver/Bit/Arms)050126
26” Holte URG Driver100335
26" Holte URG Pilot Bit100336
26" Holte URG Wing Set100337
26” Holte URG Single Arm100899
28” Holte URG Complete System (Driver/Bit/Arms)050128
28” Holte URG Driver100338
26" Holte URG Pilot Bit100339
26" Holte URG Wing Set100340
26" Holte URG Single Arm100900
30” Holte URG Complete System (Driver/Bit/Arms)050130
30” Holte URG Driver100341
30" Holte URG Pilot Bit100342
30" Holte URG Wing Set100343
30” Holte URG Single Arm100901
32” Holte URG Complete System (Driver/Bit/Arms)050132
32” Holte URG Driver100344
32" Holte URG Pilot Bit100345
32" Holte URG Wing Set100346
32" Holte URG Single Arm100902
34" Holte URG complete System (Driver/Bit/Arms)050134
34” Holte URG Driver100347
34" Holte URG Pilot Bit100348
34" Holte URG Wing Set100349
34” Holte URG Single Arm100903
36” Holte URG Complete System (Driver/Bit/Arms)050136
36” Holte URG Driver100350
36” Holte URG Bit – Drive Shoe100351
36” Holte URG Wing Set100352
36” Holte URG Single Arm100904
38” Holte URG Complete System (Driver/Bit/Arms)050138
38” Holte URG Driver100353
38” Holte URG Bit – Drive Shoe100354
38” Holte URG Wing Set100355
38” Holte URG Single Arm100905
40” Holte URG Complete System (Driver/Bit/Arms)050140
40” Holte URG Driver100356
40” Holte URG Bit – Drive Shoe100357
40” Holte URG Wing Set100358
40” Holte URG Single Arm100906
42” Holte URG Complete System (Driver/Bit/Arms)050142
42” Holte URG Driver100360
42” Holte URG Bit – Drive Shoe100361
42” Holte URG Wing Set100907
42” Holte URG Single Arm100848
Carborized Spring Pin Set (Spring, Pin, Rubber Holder) 10" 2 Req. Price EA100847
Carborized Spring Pin Set (Spring, Pin, Rubber Holder) 12"-42" 2 Req.Price EA100848