NAS 965 Type D Threaded Shank Drills

Specification

Item	Value
Type	Threaded shank drill
Material	HSCo (M33 or M42)
Finish	Steam oxide (NAS 965 Type D: oxide finish standard, other finish optional)
Maker	Precision brand, Dormer Pramet
Standard	Manufactured to NAS 965 Type D
Shank	1/4-28 UNF threaded square or hexagonal, 5/16" wrenching flats

Item	Value
Point	P-9 (135°) split point, heavy duty
Web	Thickness increases uniformly at a 0.027" ± 0.003" per inch taper
Back taper	0.0002" to 0.0005" per inch for all diameters
Size range	Ø1/16" thru ØF in the maker's NAS summary; its tables run #50 to 3/8"
Lengths	Stub, short and long (2-1/8" O.A.L.)
Status	Maker's aerospace brochure, read 30 Oct 2026; the NAS itself is not reproduced here. Check the current issue before you order.

Part numbers

Every size in the brochure, each with its order number (EDP). Lengths in inches are the maker's, l1, l2 and l3 as on its drawing; millimetres in brackets are converted.

#503 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878110	Stub	5/16	1/2 (12.7)	1/8
7878171	Short	9/16	1 (25.4)	1/4
7878232	Long	7/8	2-1/8 (54.0)	1/4

3/32"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878111	Stub	5/16	1/2 (12.7)	1/8
7878172	Short	9/16	1 (25.4)	1/4
7878233	Long	7/8	2-1/8 (54.0)	1/4

#403 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878112	Stub	5/16	1/2 (12.7)	1/8
7878173	Short	9/16	1 (25.4)	1/4
7878234	Long	7/8	2-1/8 (54.0)	1/4

#393 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878113	Stub	5/16	1/2 (12.7)	1/8
7878174	Short	9/16	1 (25.4)	1/4
7878235	Long	7/8	2-1/8 (54.0)	1/4

#383 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878114	Stub	5/16	1/2 (12.7)	1/8
7878175	Short	9/16	1 (25.4)	1/4
7878236	Long	7/8	2-1/8 (54.0)	1/4

#373 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878115	Stub	5/16	1/2 (12.7)	1/8
7878176	Short	9/16	1 (25.4)	1/4
7878237	Long	7/8	2-1/8 (54.0)	1/4

#363 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878116	Stub	5/16	1/2 (12.7)	1/8
7878177	Short	9/16	1 (25.4)	1/4
7878238	Long	7/8	2-1/8 (54.0)	1/4

7/64"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878117	Stub	5/16	1/2 (12.7)	1/8
7878178	Short	9/16	1 (25.4)	1/4
7878239	Long	7/8	2-1/8 (54.0)	1/4

#353 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878118	Stub	5/16	1/2 (12.7)	1/8
7878179	Short	9/16	1 (25.4)	1/4
7878240	Long	7/8	2-1/8 (54.0)	1/4

#343 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878119	Stub	5/16	1/2 (12.7)	1/8
7878180	Short	9/16	1 (25.4)	1/4
7878241	Long	7/8	2-1/8 (54.0)	1/4

#333 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878120	Stub	5/16	1/2 (12.7)	1/8
7878181	Short	9/16	1 (25.4)	1/4
7878242	Long	7/8	2-1/8 (54.0)	1/4

#323 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878121	Stub	5/16	1/2 (12.7)	1/8
7878182	Short	9/16	1 (25.4)	1/4
7878243	Long	7/8	2-1/8 (54.0)	1/4

#313 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878122	Stub	5/16	1/2 (12.7)	1/8
7878183	Short	9/16	1 (25.4)	1/4
7878244	Long	7/8	2-1/8 (54.0)	1/4

1/8"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878123	Stub	5/16	1/2 (12.7)	1/8
7878184	Short	9/16	1 (25.4)	1/4
7878245	Long	7/8	2-1/8 (54.0)	1/4

#303 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878124	Stub	5/16	9/16 (14.3)	1/8
7878185	Short	9/16	1-1/4 (31.8)	1/4
7878246	Long	1-1/8	2-1/8 (54.0)	1/4

#293 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878125	Stub	5/16	9/16 (14.3)	1/8
7878186	Short	9/16	1-1/4 (31.8)	1/4
7878247	Long	1-1/8	2-1/8 (54.0)	1/4

#283 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878126	Stub	5/16	9/16 (14.3)	1/8
7878187	Short	9/16	1-1/4 (31.8)	1/4
7878248	Long	1-1/8	2-1/8 (54.0)	1/4

9/64"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878127	Stub	5/16	9/16 (14.3)	1/8
7878188	Short	9/16	1-1/4 (31.8)	1/4
7878249	Long	1-1/8	2-1/8 (54.0)	1/4

#273 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878128	Stub	5/16	9/16 (14.3)	1/8
7878189	Short	9/16	1-1/4 (31.8)	1/4
7878250	Long	1-1/8	2-1/8 (54.0)	1/4

#263 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878129	Stub	5/16	9/16 (14.3)	1/8
7878190	Short	9/16	1-1/4 (31.8)	1/4
7878251	Long	1-1/8	2-1/8 (54.0)	1/4

#253 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878130	Stub	5/16	9/16 (14.3)	1/8
7878191	Short	9/16	1-1/4 (31.8)	1/4
7878252	Long	1-1/8	2-1/8 (54.0)	1/4

#243 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878131	Stub	5/16	9/16 (14.3)	1/8
7878192	Short	9/16	1-1/4 (31.8)	1/4
7878253	Long	1-1/8	2-1/8 (54.0)	1/4

#233 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878132	Stub	5/16	9/16 (14.3)	1/8
7878193	Short	9/16	1-1/4 (31.8)	1/4
7878254	Long	1-1/8	2-1/8 (54.0)	1/4

5/32"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878133	Stub	5/16	9/16 (14.3)	1/8
7878194	Short	9/16	1-1/4 (31.8)	1/4
7878255	Long	1-1/8	2-1/8 (54.0)	1/4

#223 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878134	Stub	5/16	9/16 (14.3)	1/8
7878195	Short	9/16	1-1/4 (31.8)	1/4
7878256	Long	1-1/8	2-1/8 (54.0)	1/4

#213 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878135	Stub	5/16	9/16 (14.3)	1/8
7878196	Short	9/16	1-1/4 (31.8)	1/4
7878257	Long	1-1/8	2-1/8 (54.0)	1/4

#203 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878136	Stub	5/16	9/16 (14.3)	1/8
7878197	Short	9/16	1-1/4 (31.8)	1/4
7878258	Long	1-1/8	2-1/8 (54.0)	1/4

#193 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878137	Stub	5/16	9/16 (14.3)	1/8
7878198	Short	9/16	1-1/4 (31.8)	1/4
7878259	Long	1-1/8	2-1/8 (54.0)	1/4

#183 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878138	Stub	5/16	9/16 (14.3)	1/8
7878199	Short	9/16	1-1/4 (31.8)	1/4
7878260	Long	1-1/8	2-1/8 (54.0)	1/4

11/64"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878139	Stub	5/16	9/16 (14.3)	1/8
7878200	Short	9/16	1-1/4 (31.8)	1/4
7878261	Long	1-1/8	2-1/8 (54.0)	1/4

#173 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878140	Stub	5/16	9/16 (14.3)	1/8
7878201	Short	9/16	1-1/4 (31.8)	1/4
7878262	Long	1-1/8	2-1/8 (54.0)	1/4

#163 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878141	Stub	5/16	9/16 (14.3)	1/8
7878202	Short	9/16	1-1/4 (31.8)	1/4
7878263	Long	1-1/8	2-1/8 (54.0)	1/4

#153 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878142	Stub	5/16	9/16 (14.3)	1/8
7878203	Short	9/16	1-1/4 (31.8)	1/4
7878264	Long	1-1/8	2-1/8 (54.0)	1/4

#143 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878143	Stub	5/16	9/16 (14.3)	1/8
7878204	Short	9/16	1-1/4 (31.8)	1/4
7878265	Long	1-1/8	2-1/8 (54.0)	1/4

#133 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878144	Stub	5/16	9/16 (14.3)	1/8
7878205	Short	9/16	1-1/4 (31.8)	1/4
7878266	Long	1-1/8	2-1/8 (54.0)	1/4

3/16"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878145	Stub	5/16	9/16 (14.3)	1/8
7878206	Short	9/16	1-1/4 (31.8)	1/4
7878267	Long	1-1/8	2-1/8 (54.0)	1/4

#123 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878146	Stub	5/16	9/16 (14.3)	1/8
7878207	Short	9/16	1-1/4 (31.8)	1/4
7878268	Long	1-1/8	2-1/8 (54.0)	1/4

#113 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878147	Stub	5/16	9/16 (14.3)	1/8
7878208	Short	9/16	1-1/4 (31.8)	1/4
7878269	Long	1-1/8	2-1/8 (54.0)	1/4

#103 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878148	Stub	5/16	9/16 (14.3)	1/8
7878209	Short	9/16	1-1/4 (31.8)	1/4
7878270	Long	1-1/8	2-1/8 (54.0)	1/4

#93 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878149	Stub	5/16	5/8 (15.9)	1/4
7878210	Short	9/16	1-1/4 (31.8)	5/16
7878271	Long	1-1/8	2-1/8 (54.0)	5/16

#83 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878150	Stub	5/16	5/8 (15.9)	1/4
7878211	Short	9/16	1-1/4 (31.8)	5/16
7878272	Long	1-1/8	2-1/8 (54.0)	5/16

#73 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878151	Stub	5/16	5/8 (15.9)	1/4
7878212	Short	9/16	1-1/4 (31.8)	5/16
7878273	Long	1-1/8	2-1/8 (54.0)	5/16

13/64"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878152	Stub	5/16	5/8 (15.9)	1/4
7878213	Short	9/16	1-1/4 (31.8)	5/16
7878274	Long	1-1/8	2-1/8 (54.0)	5/16

#63 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878153	Stub	5/16	5/8 (15.9)	1/4
7878214	Short	9/16	1-1/4 (31.8)	5/16
7878275	Long	1-1/8	2-1/8 (54.0)	5/16

#53 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878154	Stub	5/16	5/8 (15.9)	1/4
7878215	Short	9/16	1-1/4 (31.8)	5/16
7878276	Long	1-1/8	2-1/8 (54.0)	5/16

#43 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878155	Stub	5/16	5/8 (15.9)	1/4
7878216	Short	9/16	1-1/4 (31.8)	5/16
7878277	Long	1-1/8	2-1/8 (54.0)	5/16

#33 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878156	Stub	5/16	5/8 (15.9)	1/4
7878217	Short	9/16	1-1/4 (31.8)	5/16
7878278	Long	1-1/8	2-1/8 (54.0)	5/16

7/32"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878157	Stub	5/16	5/8 (15.9)	1/4
7878218	Short	9/16	1-1/4 (31.8)	5/16
7878279	Long	1-1/8	2-1/8 (54.0)	5/16

#23 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878158	Stub	5/16	5/8 (15.9)	1/4
7878219	Short	9/16	1-1/4 (31.8)	5/16
7878280	Long	1-1/8	2-1/8 (54.0)	5/16

#13 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878159	Stub	5/16	5/8 (15.9)	1/4
7878220	Short	9/16	1-1/4 (31.8)	5/16
7878281	Long	1-1/8	2-1/8 (54.0)	5/16

A3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878160	Stub	5/16	5/8 (15.9)	1/4
7878221	Short	9/16	1-1/4 (31.8)	5/16
7878079	Long	1-1/8	2-1/8 (54.0)	5/16

15/64"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878161	Stub	5/16	5/8 (15.9)	1/4
7878222	Short	9/16	1-1/4 (31.8)	5/16
7878283	Long	1-1/8	2-1/8 (54.0)	5/16

B3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878162	Stub	5/16	5/8 (15.9)	1/4
7878223	Short	9/16	1-1/4 (31.8)	5/16
7878081	Long	1-1/8	2-1/8 (54.0)	5/16

C3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878163	Stub	5/16	5/8 (15.9)	1/4
7878224	Short	9/16	1-1/4 (31.8)	5/16
7878082	Long	1-1/8	2-1/8 (54.0)	5/16

D3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878164	Stub	5/16	5/8 (15.9)	1/4
7878225	Short	9/16	1-1/4 (31.8)	5/16
7878083	Long	1-1/8	2-1/8 (54.0)	5/16

1/4"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878165	Stub	5/16	5/8 (15.9)	1/4
7878226	Short	9/16	1-1/4 (31.8)	5/16
7878287	Long	1-1/8	2-1/8 (54.0)	5/16

F3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878166	Stub	5/16	5/8 (15.9)	1/4
7878227	Short	9/16	1-1/4 (31.8)	5/16
7878085	Long	1-1/8	2-1/8 (54.0)	5/16

G3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878167	Stub	5/16	5/8 (15.9)	1/4
7878228	Short	9/16	1-1/4 (31.8)	5/16
7878086	Long	1-1/8	2-1/8 (54.0)	5/16

9/32"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878168	Stub	5/16	5/8 (15.9)	1/4
7878229	Short	9/16	1-1/4 (31.8)	5/16
7878290	Long	1-1/8	2-1/8 (54.0)	5/16

5/16"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878169	Stub	5/16	5/8 (15.9)	1/4
7878230	Short	9/16	1-1/4 (31.8)	5/16
7878291	Long	1-1/8	2-1/8 (54.0)	5/16

3/8"3 part numbers

Part no.	Length	Flute l2, in	Overall l1, in (mm)	l3, in
7878170	Stub	5/16	5/8 (15.9)	1/4
7878231	Short	9/16	1-1/4 (31.8)	5/16
7878292	Long	1-1/8	2-1/8 (54.0)	5/16

What each code means

Part	Meaning
TS41CO	Series: Stub, wire gauge sizes
TS40CO	Series: Stub, fractional sizes
TS42CO	Series: Stub, letter sizes
TS18CO	Series: Short, wire gauge sizes
TS10CO	Series: Short, fractional sizes
TS15CO	Series: Short, letter sizes
TS52CO	Series: Long, wire gauge sizes
TS51CO	Series: Long, fractional sizes
TS55CO	Series: Long, wire gauge sizes (as the brochure prints it)
Example	7878173 — #40, short: flute 9/16 in, overall 1 in

Notes

Inch values are the maker's and are the official ones. Millimetres marked as converted are inches × 25.4.
Catalogue items linked to this sheet match it by type: the seller's listing does not name this maker, so check the listing before you take a value from here.
A distributor lists its bits as NAS 965 cobalt, 135° split, 1/4"-28, in the same short lengths as this table for #40, #30, #21 and #11.
The brochure offers other diameters and lengths on request, and HSCo or solid carbide for the drilling portion.

Where to buy

AmericaDistributor coming soonOur partner for this region is on its way

EuropeDistributor coming soonOur partner for this region is on its way

OceaniaDistributor coming soonOur partner for this region is on its way

Distributors coming soon.

Sources

Dormer Pramet Precision brochure — Drills Manufactured to National Aerospace Standards (NAS), pages 30 to 33 and 37 — sizes, lengths and order numbers, and the maker's summary of NAS 965 Type D. The maker's brochure, in a copy hosted for distributors.

Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.

Specification

Part numbers

What each code means

Notes

Where to buy

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Calculators

Guides

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Data sheets

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Sources