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Popular Support Pages-> Wood Screws Types Threaded Insert and T-Nut Guide Wood Screw Size Chart PILOT HOLE SIZE CHART

Threaded Insert and T-Nut Technical

McFeely's LeprechaunMcFeely's Leprechaun

McFeely's Threaded Inserts and T-Nuts Technical Information

Threaded Inserts


McFeely's Brass Threaded Inserts Technical DrawingMcFeely's Unflanged Threaded Inserts Technical DrawingMcFeely's Flanged Threaded Inserts Technical Drawing
SKU Description Thread Size L (in) A/F (in) B/D (in) Drill Size* Minimum Depth** Driver Size
KTI-440 4-40 Brass Thread Inserts 4-40 0.375 0.25 0.328 17/64 0.406  
3603-BI*** 8-32 Brass Threaded Inserts 8-32 0.375 0.25 0.328 17/64 0.406  
3603-SSI 8-32 Stainless Steel Threaded Inserts 8-32 0.375 0.25 0.328 17/64 0.406  
9015-HD 8-32 Flanged Hex Drive Threaded Inserts 8-32 0.394 0.335 0.315 15/64   4mm
3604-BI*** 10-24 Brass Threaded Inserts 10-24 0.5 0.375 0.453 25/64 0.531 3604-PD
3604-SSI 10-24 Stainless Steel Threaded Inserts 10-24 0.5 0.375 0.453 25/64 0.531 3604-PD
3604-STS/
3604-STZ		 10-24 Steel Threaded Inserts for Hardwoods 10-24 0.472 0.394 0.299 5/16   5mm
3606-BI*** 1/4-20 Brass Threaded Inserts 1/4-20 0.5 0.375 0.453 25/64 0.531 3606-PD
3606-SSI 1/4-20 Stainless Steel Threaded Inserts 1/4-20 0.5 0.375 0.453 25/64 0.531 3606-PD
3606-STZ 1/4-20 Threaded Inserts for Hardwood, Clear Zinc Plated 1/4-20 0.591 0.472 0.374 3/8   6mm
9030-HD*** 1/4-20 Short Flanged Hex Drive Threaded Inserts 1/4-20 0.512 0.492 0.461 23/64   6mm
9040-HD*** 1/4-20 Short UnFlanged Hex Drive Threaded Inserts 1/4-20 0.512   0.453 23/64   6mm
9045-HD 1/4-20 Long UnFlanged Hex Drive Threaded Inserts 1/4-20 0.789   0.453 23/64   6mm
3607-BI*** 5/16-18 Brass Threaded Inserts 5/16-18 0.625 0.5 0.594 33/64 0.656 3607-PD
3607-STZ 5/16-18 Threaded Inserts for Hardwood, Clear Zinc Plated 5/16-18 0.591 0.552 0.453 15/32   8mm
3608-BI*** 3/8-16 Brass Threaded Inserts 3/8-16 0.625 0.5 0.594 33/64 0.656 3608-PD
3608-STS 3/8-16 Threaded Inserts for Hardwood, Clear Zinc Plated 3/8-16 0.591 0.728 0.618 5/8   10mm
Notes:
  • * Hole size requirements may vary depending on a number of factors, including material and tools. We recommend that you test your particular application on a scrap peice before your final project peice.
  • ** For increased pull out strength, insert may be driven up to 1/4” below surface.
  • Varnish may be used as lubricant during insert installation.
  • *** Are included in TI-KIT.

    • Prop 65 WarningWARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood.


    WARNING: Brass Threaded Inserts can expose you to lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

    WARNING: Clear Zinc Plated and Stainless Steel Inserts can expose you to chromium, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

T-Nuts
SKU Description Thread Size Barrel Height Barrel Diameter Base Diameter Prong Height Drill Size* Prongs
SSN-1824 10-24 Tee Nuts, 18-8 Stainless 10-24 9/32" .227 in.-.232 in. 3/4 in. 13/64 in. 15/64 in. 4
STN-1007 10-24 x 7/16 UltraGrip T-Nuts w/ Small Flange 10-24           4
SSN-2520 1/4-20 Tee Nuts, 18-8 Stainless 1/4-20 3/8 in. .306 in.-.311 in. 3/4 in. 13/64 in. 5/16 in. 4
LTN-2507 1/4-20 x 7/16 UltraGrip T-Nuts w/ Large Flange 1/4-20 1/2 in. .386 in.-.391 in. 7/8 in. 17/64 in. 13/32 in. 4
SSN-3118 5/16-18 Tee Nuts, 18-8 Stainless 5/16-18           4
LTN-3110 5/16-18 x 5/8 UltraGrip T-Nuts w/ Large Flange 5/16-18           4
SSN-3716 3/8-16 Tee Nuts, 18-8 Stainless 3/8-16 7/16 in. .466 in.-.471 in. 1 in. 21/64 in. 31/64 in. 4

Prop 65 WarningWARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood.


WARNING: This product can expose you to chromium, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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