ACME American Trapezoidal Laydown Threading Inserts – 11 / 16 / 22 / 27 Series
Ideal for: Lead Screws, Jacks, American Power Transmission Systems.
- Product Standard: ACME American Standard Trapezoidal Full Profile laydown threading inserts (29°).
- Power Transmission: Designed to produce the robust 29° thread form used in American linear motion machinery and valve stems.
- Wide TPI Range: Comprehensive coverage from fine 16 TPI down to coarse 4 TPI.
- Core Availability: Includes the industry-standard 16er threading insert (3/8″ I.C.) alongside precision 1/4″, 1/2″, and 5/8″ sizes.
- Versatility: High-performance threading inserts for lathe holders, stocked in Right-Hand and left hand thread insert (EL/IL) models.
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Material: Tough carbide threading inserts designed to withstand the side loads of trapezoidal cutting.
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Product Overview
Produce high-quality power threads with our ACME Full Profile laydown threading inserts. Compliant with ANSI/ASME B1.5 standards, these tools generate the specific 29° trapezoidal profile required for American lead screws and jacks.
Featuring a “Full Profile” geometry, these carbide threading inserts cut the thread groove and finish the crest diameter in a single pass. This ensures the thread form is precise and burr-free, which is critical for minimizing friction in power transmission assemblies.
Key Features & Benefits
- Standard Compliance: Precision ground to maintain the 29° angle, distinguishing it from the 30° Metric TR standard.
- The 16ER Standard: Our 16er threading inserts (3/8″ I.C.) efficiently handle the most common pitch range (16 TPI to 8 TPI) found in general machinery.
- Heavy Duty Capability: For coarser threads (6 TPI to 4 TPI), we utilize larger 1/2″ (22mm) and 5/8″ (27mm) I.C. inserts to ensure tool rigidity.
- Directional Options: We offer comprehensive solutions, including standard right-hand tools and left hand thread insert models (e.g., 16EL 10 ACME) for bi-directional lead screw manufacturing.
ACME External Threading Inserts Technical Specifications
| I.C. | Pitch (TPI) | Right-hand | Left-hand | L | X | Y |
|---|---|---|---|---|---|---|
| 1/4″ | 16 | 11ER16ACME | 11EL16ACME | 11 | 0.9 | 1 |
| 3/8″ | 16 | 16ER16ACME | 16EL16ACME | 16 | 0.9 | 1 |
| 3/8″ | 14 | 16ER14ACME | 16EL14ACME | 16 | 1 | 1.2 |
| 3/8″ | 12 | 16ER12ACME | 16EL12ACME | 16 | 1.1 | 1.2 |
| 3/8″ | 10 | 16ER10ACME | 16EL10ACME | 16 | 1.3 | 1.3 |
| 3/8″ | 8 | 16ER8ACME | 16EL8ACME | 16 | 1.5 | 1.5 |
| 1/2″ | 6 | 22ER6ACME | 22EL6ACME | 22 | 1.8 | 2.1 |
| 1/2″ | 5 | 22ER5ACME | 22EL5ACME | 22 | 2 | 2.3 |
| 5/8″ | 4 | 27ER4ACME | 27EL4ACME | 27 | 2.3 | 2.7 |
ACME Internal Threading Inserts Technical Specifications
| I.C. | Pitch (TPI) | Right-hand | Left-hand | L | X | Y |
|---|---|---|---|---|---|---|
| 1/4″ | 16 | 11IR16ACME | 11IL16ACME | 11 | 0.9 | 1 |
| 3/8″ | 16 | 16IR16ACME | 16IL16ACME | 16 | 0.9 | 1 |
| 3/8″ | 14 | 16IR14ACME | 16IL14ACME | 16 | 1 | 1.2 |
| 3/8″ | 12 | 16IR12ACME | 16IL12ACME | 16 | 1.1 | 1.2 |
| 3/8″ | 10 | 16IR10ACME | 16IL10ACME | 16 | 1.3 | 1.3 |
| 3/8″ | 8 | 16IR8ACME | 16IL8ACME | 16 | 1.5 | 1.5 |
| 1/2″ | 6 | 22IR6ACME | 22IL6ACME | 22 | 1.8 | 2.1 |
| 1/2″ | 5 | 22IR5ACME | 22IL5ACME | 22 | 2 | 2.3 |
| 5/8″ | 4 | 27IR4ACME | 27IL4ACME | 27 | 2.3 | 2.7 |
(Note: Left-hand models 11EL/IL, 16EL/IL, 22EL/IL, 27EL/IL are available for all pitches listed above ).
Machining Guidelines
- Clearance Check: ACME threads have steep lead angles. Ensure your threading inserts for lathe holders have the correct shim (anvil) installed to prevent the insert flank from rubbing against the thread wall.
- In-Feed Method: For coarser pitches (e.g., 6 TPI or 4 TPI), use a modified flank in-feed (alternating flank) to reduce cutting pressure on the laydown threading inserts.
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Stability: For pitches coarser than 4 TPI, please refer to our Heavy Duty U-Type series.
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