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Screw Ring Gauge - Unified Coarse Pitch (UNC)

The Screw Ring Gauge – Unified Coarse Pitch (UNC) from TTG Screw Gauges is manufactured for accurate inspection of external Unified Coarse (UNC) threads. Designed to meet ANSI/ASME B1.2 standards, these precision GO and NO GO thread ring gauges help manufacturers verify thread accuracy, ensuring consistent product quality and compliance during production.

Features & Benefits

Manufactured to ANSI/ASME B1.2 Unified Thread Standard
GO and NO GO Screw Ring Gauges for precise external thread inspection
Screw Ring Gauges supplied to Class 2A
Solid construction for excellent wear resistance and long service life
Right-hand thread gauges supplied as standard
Ensures fast, accurate, and repeatable thread verification
Ideal for production, inspection, and quality assurance environments

Available UNC Sizes

UNIFIED COARSE PITCH (UNC)
SIZES	SCREW RINGS
	Solid	Solid
	GO Ring	NOT GO Ring
	ORDER NO.	ORDER NO.
1 - 64 UNC	TR1UNC-G	TR1UNC-NG
2 - 56 UNC	TR2UNC-G	TR2UNC-NG
3 - 48 UNC	TR3UNC-G	TR3UNC-NG
4 - 40 UNC	TR4UNC-G	TR4UNC-NG
5 - 40 UNC	TR5UNC-G	TR5UNC-NG
6 - 32 UNC	TR6UNC-G	TR6UNC-NG
8 - 32 UNC	TR8UNC-G	TR8UNC-NG
10 - 24 UNC	TR10UNC-G	TR10UNC-NG
12 - 24 UNC	TR12UNC-G	TR12UNC-NG
1/4 - 20 UNC	TR1/4UNC-G	TR1/4UNC-NG
5/16 - 18 UNC	TR5/16UNC-G	TR5/16UNC-NG
3/8 - 16 UNC	TR3/8UNC-G	TR3/8UNC-NG
7/16 - 14 UNC	TR7/16UNC-G	TR7/16UNC-NG
1/2 - 13 UNC	TR1/2UNC-G	TR1/2UNC-NG
9/16 - 12 UNC	TR9/16UNC-G	TR9/16UNC-NG
5/8 - 11 UNC	TR5/8UNC-G	TR5/8UNC-NG
3/4 - 10 UNC	TR3/4UNC-G	TR3/4UNC-NG
7/8 - 9 UNC	TR7/8UNC-G	TR7/8UNC-NG
1" - 8 UNC	TR1"UNC-G	TR1"UNC-NG
1.1/8 - 7 UNC	TR1.1/8UNC-G	TR1.1/8UNC-NG
1.1/4 - 7 UNC	TR1.1/4UNC-G	TR1.1/4UNC-NG
1.3/8 - 6 UNC	TR1.3/8UNC-G	TR1.3/8UNC-NG
1.1/2 - 6 UNC	TR1.1/2UNC-G	TR1.1/2UNC-NG

Unified Thread Designations

UNC – Unified Coarse Thread
UNF – Unified Fine Thread
UNEF – Unified Extra Fine Thread
UN – Unified Constant Pitch (4, 6, 8, 12, 16, 20, 28, 32 UN)
UNS – Unified Special Thread

Special Thread Gauges Available

TTG also manufactures a comprehensive range of special thread gauges, including:

Class 1A and Class 3A gauges
UNS (Unified Special) thread gauges
Non-standard thread gauges
Special pitch and diameter combinations
Pre-plating thread gauges
Special tolerance classes
Custom thread gauges manufactured to customer drawings and specifications
BS 1580 Part 1, Part 2 & Part 3 available upon request
BS 919 Part 1 available upon request

Why Choose TTG Screw Gauges?

Manufacturers trust TTG Screw Gauges for delivering precision, durability, and reliable thread inspection performance. Every gauge is produced to stringent quality standards to ensure accurate GO/NO GO thread verification and long-term measurement consistency.

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