Thread Gauges Archives - Gokul Traders

Thread Gauge Customized Gauges

Note:
Odd pitch and diameter combination, extra fine pitch gauges also manufactured.

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Thread Gauge: Hole Location

Baker manufactures hole location plugs as shown. These are used to measure & check the location of small tapped holes. This is a perfect thread gauge to inspect features for run-out to the pitch diameter of the threads. These give a firm locating grip without pulling the shoulder of the plug up against the hole face thus avoiding squareness errors.

Hole location plugs are commonly used to measure the location of tapped holes. It is difficult to accurately measure the location of tapped holes using conventional methods; i.e. CMM’s or indicating type instruments. Hole location plugs are deliberately manufactured with Pitch diameter over-size, then slitted, resulting in the threaded section collapsing while being screwed in the threaded hole. The hole location plug will screw in tightly, locating on the Pitch diameter of the tapped hole. A measurement can then be taken from the datum point to the cylindrical diameter on the hole location plug to determine location. For very small sizes, the plug is not slitted but the thread is manufactured with a gradual taper, which will lock up on the thread.

Positive grip on flanks regardless of hole size.
Shank diameter 6.35 mm is maintained within ± 0.0025 mm.
The shank is concentric to the threaded portion within 0.0025 mm.
Available in Metric & Unified Sizes.
Metric Sizes M6 & above are slitted.
Unified Sizes No 12 & above are slitted.

thread gauge-thread-gauge_hole-location_01

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API (Oil) Thread Gauges

FEATURES:

Light construction
Longer operating life
Manufacturing to the highest Japanese quality standards
Best Raw materials from Japan used
Easy to use: The handle is standard-equipped on all products
Upon request, a Hook Ring can be mounted on larger diameter ring gauges for better work ability

API SPEC.5B (Cashing & Tubing)

LI

Line Pipe Thread Gauges
Thread angle 60°

Size	T.P.I.	Taper
⅛	27	1 : 16
¼	18	1 : 16
⅜	18	1 : 16
½	14	1 : 16
¾	14	1 : 16
1	11½	1 : 16
1¼	11½	1 : 16
1½	11½	1 : 16
2	11½	1 : 16
2½	8	1 : 16
3	8	1 : 16
3½	8	1 : 16
4	8	1 : 16
5	8	1 : 16
6	8	1 : 16
8	8	1 : 16
10	8	1 : 16
12	8	1 : 16
14D	8	1 : 16
16D	8	1 : 16
18D	8	1 : 16
20D	8	1 : 16

CSG

Casing Round Thread Gauges
Thread angle 60°

Size	T.P.I.	Taper
4 ½	*8	1 : 16
5	*8	1 : 16
5 ½	*8	1 : 16
6	*8	1 : 16
7	*8	1 : 16
7 ⅝	*8	1 : 16
8 ⅝	*8	1 : 16
9 ⅝	*8	1 : 16
10 ¾	8	1 : 16
11 ¾	8	1 : 16
13 ⅜	8	1 : 16
16	8	1 : 16
18 ⅝	8	1 : 16
20	*8	1 : 16

BUTTRESS CSG

Buttress Casing Thread Gauges
Thread angle 3° x 10°

Size	T.P.I.	Taper
4 ½	5	1 : 16
5	5	1 : 16
5 ½	5	1 : 16
6 ⅝	5	1 : 16
7	5	1 : 16
7 ⅝	5	1 : 16
8 ⅝	5	1 : 16
9 ⅝	5	1 : 16
10 ¾	5	1 : 16
11 ¾	5	1 : 16
13 ⅜	5	1 : 16
16	5	1 : 12
18 ⅝	5	1 : 12
20	5	1 : 12

TBG

Non-Upset Tubing Thread Gauges
Thread angle 60°

Size	T.P.I.	Taper
1.050	10	1 : 16
1.315	10	1 : 16
1.660	10	1 : 16
1.900	10	1 : 16
2 ⅜	10	1 : 16
2 ⅞	10	1 : 16
3 ½	10	1 : 16
4	8	1 : 16
4 ½	8	1 : 16

UP TBG

External-Upset Tubing Thread Gauges
Thread angle 60°

Size	T.P.I.	Taper
1.050	10	1 : 16
1.315	10	1 : 16
1.660	10	1 : 16
1.900	10	1 : 16
2 ⅜	8	1 : 16
2 ⅞	8	1 : 16
3 ½	8	1 : 16
4	8	1 : 16
4 ½	8	1 : 16

Ex. Li. Casing

Extreme-Line Casing Thread & Seal Gauges
Thread angle 6° x 6°

Size	T.P.I.	Taper
5	6	1 : 8
5 ½	6	1 : 8
6 ⅝	6	1 : 8
7	6	1 : 8
7 ⅝	6	1 : 8
8 ⅝	5	1 : 9.6
9 ⅝	5	1 : 9.6
10 ¾	5	1 : 9.6

API SPEC 7-2 (Rotary Shouldered Connections)

NC

Number Style
Thread angle 60°

Size	T.P.I.	Taper
NC 23	4	1 : 6
NC 26	4	1 : 6
NC 31	4	1 : 6
NC 35	4	1 : 6
NC 38	4	1 : 6
NC 40	4	1 : 6
NC 44	4	1 : 6
NC 46	4	1 : 6
NC 50	4	1 : 6
NC 56	4	1 : 4
NC 61	4	1 : 4
NC 70	4	1 : 4
NC 77	4	1 : 4

REG

Regular Style (Right or Left hand)
Thread angle 60°

Size	T.P.I.	Taper
1	6	1 : 8
1 ½	6	1 : 8
2 ⅜	5	1 : 4
2 ⅞	5	1 : 4
3 ½	5	1 : 4
4 ½	5	1 : 4
5 ½	4	1 : 4
6 ⅝	4	1 : 6
7 ⅝	4	1 : 4
8 ⅝	4	1 : 4

FH

Full-hole Style
Thread angle 60°

Size	T.P.I.	Taper
3 ½	5	1 : 4
4	4	1 : 6
4 ½	5	1 : 4
5 ½	4	1 : 6
6 ⅝	4	1 : 6

IF

Internal-Flush Style
Thread angle 60°

Size	T.P.I.	Taper
2 ⅜	4	1 : 6
2 ⅞	4	1 : 6
3 ½	4	1 : 6
4	4	1 : 6
4 ½	4	1 : 6
5 ½	4	1 : 6

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NPT


Gauge dimensions are as per ASME B1.20.1. Gauges are supplied as Basic Step & Min/Max Step.	–
GAUGING EXTERNAL THREADS	GAUGING INTERNAL THREADS

With basic step Ring gauge	With basic step Plug gauge

The Basic Step gauge when screwed onto the threads of the component by hand, should be flush with the endof the component face within 1 turn, as shown above.

With Min/Max step Ring gauge	With Min/Max step Plug gauge

When using a Min/Max Step type gauge, the end of the component face should be flush between the Minimum and Maximum steps.

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NPTF, ANPT

NPTF Threads are also known as Dryseal threads as they do not require a sealant to form a leak-proof joint.

Type	Standard	Plug gauges	Ring gauges
NPFT	ANSI/ASME B 1.20.5	Thread plug gauges L1 & L3 (Basic Step or Min/Max Step) 6 Step Crest Check Plug	Thread ring gauges L1 & L2 (Basic Step or Min/Max Step) 6 Step Crest Check ring
ANPT	SAE SA71051B	Thread plug gauges L1 & L3 (Basic Step or Min/Max Step) 6 Step Crest Check Plug	Thread ring gauges L1 & L2 (Basic Step or Min/Max Step) 6 Step Crest Check ring

NPTF & ANPT threads require additional gauging as the truncation of these threads should be maintained within specified limits.
L1 & L3 plug gauges and L1 & L2 Ring gauges are used in combination to verify the size and taper of the component threads along the thread length.
6 Step Crest check plug and ring gauges are used to verify the crest diameter and truncation of the component threads along the thread length.

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Taper Pipe Threads ISO 7-R, BSPT, PT

These are taper pipe threads where pressure tight joints are made on threads. The thread angle is 55°
Gauges are manufactured as per ISO 7-2, EN 10226, BS 21, JIS B0253

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Trapezoidal

Gauge dimensions are as per DIN 103-9
Recommended Tolerance classes are 7H/7e for medium tolerance quality and 8H/8c for coarse tolerance quality.

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Thread Gauge: ACME & STUB ACME

Thread Gauge dimensions for Acme threads are as per ASME B1.5 and Stub Acme as per ANSI/ASME B1.8
Most commonly used class is 2G. If less backlash is desired in acme threads, 3G & 4G class are used
The height of Acme threads is 0.5p, whereas the height of Stub Acme threads is 0.3p

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Thread Gauge: ‘G’ Pipe BSP

These are pipe threads where pressure-tight joints are not made on threads. Gauge dimensions are as per ISO 228-2

	Tolerance class
Therad Ring gauge	A’ & ‘B’
Therad Plug gauge	–

Acceptance criteria for components:

The GO gauge when screwed by hand without using excessive force, should enter and pass the whole length of the workpiece thread. The NOT GO gauge when screwed by hand without using excessive force, should not enter the component by more than two turns of the thread from both ends.

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Thread Gauge: Unified

Acceptance criteria for components

The GO gauge when screwed by hand without using excessive force, should enter and pass the whole length of the workpiece thread. The NOT GO gauge when screwed by hand without being forced, should not enter the component by more than three complete turns.

thread gauge unified-thread-gauge_unified_02

thread gauge unified-thread-gauge_unified_03