Threaded Insert Styles

1. Keenserts:

• This insert is a very robust and dependable insert primarily because of the locking keys, with internal thread diameters ranging from .086 to .500 O.D. It also takes up the most space.
  
• MIL-I-45914.......Insert, Screw Thread-Locked in, Key Locked, General Specification For  
• MS51830............Insert, Screw Thread-Locked in, Key Locked, Miniature and Lightweight
• MS51831............Insert, Screw Thread-Locked in, Key Locked, Heavy Duty
  
• MS51832............Insert, Screw Thread-Locked in, Key Locked, Extra Heavy Duty
  
• MS51835............Inserts and Studs, Locked in- Key Locked, Hole Dimensions For and Assembly of
• NAS1394...........Metal, Insert-Threaded, lightweight, self-locking, and non self-locking
  
• NAS1395...........Metal, Insert-Threaded, heavy-duty, self-locking, and non self-locking
• Specialty Fasteners Company
• Keensert dimensional information.
• Alcoa Fastening Systems Aerospace
  
• Simple table of boss to insert diameter based on MS51830 part numbers.
  
• In the table below are guidelines for what will yield the most economical machined housings and covers with stepped flanges, using Keenserts.
  
• Note that the boss diameter in the chart below is about 2 Times the mazimum insert thread diameter, which is a little conservative.
• Rule of Thumb: Boss diameter equals 3 times the pitch, times 2, plus the maximum thread diameter. For example, the boss size for a 4(.112)-40 screw would be (1/40*3)*2+0.112=.262 diameter.
• Don't forget about thread relief, when tapping a hole.

Keensert Boss and Cover to Housing Guidelines
Screw      Size	MS51830CAxx  Insert Dash  No.	Socket Hd Cap Screw				Flat Washer			Insert		Hole	Boss		Parts
		Dia	Hd dia	Hd hght	Part Number	Dia	Thk	Part Number	O.D.	Length	Min full thd	Lng	1/2 Dia	Cover	Chassis
		A	B max	C max		D max	E		F	G max	H	J min	K	L	M ref
2	-101	0.086	0.140	0.086	NAS1351 CxxLExx	0.164	0.016	NAS620 Cx	0.164	0.135	0.140	0.350	0.170	0.120	0.350
4	-102	0.112	0.183	0.112		0.224	0.032		0.190	0.185	0.160	0.400	0.190	0.150	0.400
6	-103	0.138	0.226	0.138		0.282	0.032		0.216	0.185	0.160	0.420	0.220	0.170	0.450
8	-104	0.164	0.270	0.164		0.319	0.032		0.250	0.235	0.210	0.480	0.250	0.190	0.500
10	-105	0.190	0.312	0.190		0.369	0.063		0.312	0.327	0.370	0.600	0.310	0.220	0.590
1/4	-106	0.250	0.375	0.250	NAS1352 Nxx-xx	0.483	0.063	NAS620 Cx	0.375	0.390	0.430	0.750	0.370	0.290	0.710
5/16	-107	0.312	0.469	0.312		0.582	0.063	AN960 C516	0.437	0.452	0.500	0.900	0.440	0.340	0.830
3/8	-108	0.375	0.562	0.375		0.645	0.063	AN960 C616	0.500	0.515	0.560	1.050	0.500	0.370	0.920
7/16	-109	0.437	0.656	0.437		0.770	0.063	AN960 C716	0.562	0.577	0.620	1.200	0.560	0.440	1.050
1/2	-110	0.500	0.750	0.500		0.895	0.063	AN960 C816	0.625	0.640	0.680	1.350	0.620	0.500	1.170

2. T-Serts:

• These inserts are nice because they have several outside diameters available for each thread size, allowing you to replace inserts if internal threads are damaged, assuming of course that you planned for the larger insert when determining your boss diameter. Check the vendor link below for more specifics. Internal thread diameters range from .086 to .500 O.D.

• MIL-I-45932/2........Insert, Screw Thread, Thin Wall, Locked in.
• The Mil Spec did specify a #0-80 thread version, but it was deleted.
  
• Long-Loc Fasteners Corporation
  
• T-Sert dimensional information.

3. Helicoils 

• These are the wire inserts everybody is probably familiar with. I've listed two vendors here, one in the US and one in the UK. Internal thread diameters range from .086 to 1.500  O.D.
• MS1130...........................Coil, Helical, Insert, Screw Thread, Free Running and Self Locking, Tangless.
• MS122076-122115..........Insert Cres Helical Coil Coarse Thread 1 Dia Nominal Length (S/S by NASM122076THRU122115)
• MS122116-122155..........Insert Cres Helical Coil Coarse Thread 1 1/2 Dia Nominal Length (S/S by NASM122116THRU122155)
• MS122156-122195..........Insert Cres Helical Coil Coarse Thread 2 Dia Nominal Length (S/S by NASM122156THRU122195)
• MS122196-122235..........Insert Cres Helical Coil Coarse Thread 2 1/2 Dia Nominal Length (S/S by NASM122196THRU122235)
• MS122236-122275..........Insert Cres Helical Coil Coarse Thread 3 Dia Nominal Length (S/S by NASM122237THRU122275)
• MS124651-124690..........Insert Cres Helical Coil Fine Thread 1 Dia Nominal Length (S/S by NASM124651THRU124690)
• MS124691-124730..........Insert Cres Helical Coil Fine Thread 1 1/2 Dia Nominal Length (S/S by NASM124691THRU124730)
• MS124731-124770..........Insert Cres Helical Coil Fine Thread 2 Dia Nominal Length (S/S by NASM124731THRU124770)
• MS124771-124810..........Insert Cres Helical Coil Fine Thread 2 1/2 Dia Nominal Length (S/S by NASM124771THRU124810)
• MS124811-124850..........Insert Cres Helical Coil Fine Thread 3 Dia Nominal Length (S/S by NASM124811THRU124850)
• To my knowledge No. 0 inserts are not available.
  
• Emhart Teknologies
• Emhart's Heilicoil catalog dimensional information, compliments of Technology Components Southwest.
  
• WTI Fasteners Limited
  
•  Wire Thread Inserts (Helicoil) dimensional information.
• This is a UK vendor and the O.D. of the helicoil insert seems to be different than it's American counter part. If you are thinking of using this as an alternate you may want to check it out thoroughly.
  
• For rough sizing, multiplying the screw size by 1.2 will give you the approx insert O.D.
• Below is  quick reference chart  complied from  information contained in Emhart Teknologies catalog for the tanged 1191 and 1185 series.
  

4. Rivnuts 

• The original rivnut was invented in the 30's and given these military and aerospace standard numbers. .112 to .500  Thd Sizes.
• MS27130...........................Nut, Plain, Blind Rivet-Flat and Countersunk Head, Open End (S/S by NAS1329 and NAS1330).
• NAS1329...........................Nut, Blind Rivet Flathead, Internal Thread, Non Locking (Free Running) or Self Locking (Prevaling Torque).
• NAS1330...........................Nut, Blind Rivet Countersunk Head, Internal Thread, Non Locking (Free Running) or Self Locking (Prevailing Torque)
• Here are a couple of leading industry companies and their catalogs.
• B'o'llhoff (design guide and catalog)
• Penn Engineering Inc. If you go to Penn's site there is a military to vendor part number cross reference list for these rivet nuts (rivnuts). See their full line catalog or check the individual product types listed below.
  
• Spin-Tite (low profile head catalog)
• Max-Tite (high torque out resistant catalog)