Lead Gage Operation Manual
Model LG-5003
Copyright © 2014 Gagemaker. All rights reserved
9
Zeroing the Lead Gage
Materials Needed:
Lead gage
Lead gage standard
The lead gage performs a comparative inspection between a fixed standard and the threaded part.
Before applying the gage to a part, you must zero the lead gage on the proper standard.
Based on the type of connection being inspected, locate the proper lead gage standard in the table
below to ensure consistent and accurate readings. The lead gage should be zeroed on a standard once
during each shift, at a minimum.
Connection Type
Taper
(in/ft)
Threads
per Inch
Lead Gage
Standard Model
Number
API 8-Round Casing, Tubing & Drill Pipe
All 10-Round Tubing
¾
8 & 10
LS-1001
Straight Threads, 6 -18 Pitch, 4” Length8 & 10 V Form
Tubing (straight)
0
8 & 10
LS-1002
11 ½” “V” API Line Pipe
¾
11½
LS-1003
Straight Threads, Line Pipe
0
11½
LS-1004
API Buttress Casing, Internal/External 14 ½” - 13
⅜
”
¾
5
LS-1005
API Buttress Casing, Internal/External 16” &Larger
1
5
LS-1006
6
⅝
API Reg
4”, 5½” - 6
⅝
” API Full Hole
2
⅞
”, 3 ½” – 5” Hughes Xtra Hole
2
⅜
”, 2
⅞
”, 4 ½” Hughes Slim Hole
2
⅜
” - 5½” API INT Flush
API Numbered Connections #23 - #50
2
4
LS-1007
5½”, 7
⅝
” , 8
⅝
” API Reg
API Numbered Connections #56 - #77
3
4
LS-1008
2
⅜
” - 4 ½” Reg
3 ½”, 4½” API Full Hole
3
5
LS-1009
API Numbered Connections #10, #12, #13, #16
M.T. (Macaroni Tubing)
2
⅜
” - 3 ½” PAC
2
⅜
” – 4” American Open Hole
1½
4
LS-1010
3½” - 6
⅝
” H-90
2
3½
LS-1011
7” - 8
⅝
” H-90
3
3½
LS-1012
2
⅜
” - 3½” Slimline H-90
1¼
3
LS-1013
Straight Threads, 1-5 pitch, 4” length
N/A
N/A
LS-5001
Straight Threads, 6-18 pitch, 4” length
N/A
N/A
LS-5002