Details

---

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.