0.75" × 16 TPI PUSH-BUTT (push type) External Thread Specifications

0.75-16 PUSH-BUTT-2A · 0.7500-16 PUSH-BUTT-2A

ASMESTD: ASME B1.9SOURCE: Table 3, Tables 1, 2, 5TYPE: External (bolt/screw)CLASS: 2AFLANKS 7° / 45°ROOT: roundTable 1 combination

Thread profile

0.75-16 PUSH-BUTT-2A: solid = maximum material, dotted = minimum material, dashed = basic profile before the allowance. Flanks 7° (pressure) and 45° (clearance) from the radial line, 52° thread angle; drawn to scale.

Limits of size, class 2A

Dimension	Basic	Max	Min	Tolerance
Major diameter dCrest of the male thread, max = D − G	0.7500	0.7458	0.7396	0.0062
Pitch diameter EMax = D − h − G	0.7125	0.7083	0.7021	0.0062
Minor diameter KsRoot of the male thread; min is a reference value	0.6750	0.6630	0.6516ref.	0.0114ref.
Allowance GSpace below basic size; equals the Class 3 PD tolerance (Sec. 7)		0.0042
Root radius rRound root, male (Fig. 1a)		0.004463	0.002231
Thread engagement heh − G/2 at max, less the PD tolerance at min		0.035400	0.029200

Dimensions in inches. Values are those of the standard (ASME B1.9); calculated cells follow the standard’s formulas. Where the standard prints a value that differs from its formula, the printed value is shown with a note.

Mating female thread, limits of size, class 2B

Dimension	Basic	Max	Min	Tolerance
Major diameter DnRoot of the female thread, min = D + 0.12542p; max for reference	0.7500	0.7692ref.	0.7578
Pitch diameter EMin = D − h	0.7125	0.7187	0.7125	0.0062
Minor diameter KnCrest of the female thread, min = D − 2h	0.6750	0.6812	0.6750	0.0062
Root radius rRound root, female (Fig. 1a)		0.004463	0.002231

Lead, flank angle and length of engagement

Lead + flank variation limit Σ: 0.00620 inPitch diameter equivalent of lead and flank errors together (Class 2: the PD tolerance; Class 3: half)
Lead variation alone ±δl: 0.00348 inAllowable lead error if there is no flank error
45° flank angle variation alone ±δα: 5.221 °Half-angle error of the clearance flank
7° flank angle variation alone ±δα: 11.022 °Half-angle error of the pressure flank

Gaging Sections 10, 11 · Tables 6, 7, 8, 11

Male thread 0.75-16 PUSH-BUTT-2A

Gage pitch tolerance (W): 0.00015 in
Gage 7° flank angle tolerance: 10 min
Gage 45° flank angle tolerance: 8 min
Gage major / minor tolerance: 0.0006 in
Gage pitch diameter tolerance: 0.00020 in
PD equivalent of pitch and flank tolerance: 0.0005 in
GO pitch diameter limit: 0.7083 in
NOT GO pitch diameter limit: 0.7021 in
NOT GO truncated crest diameter: 0.6802 in
Setting plug truncated major diameter: 0.7333 in
Best-size wire: 0.03384 · C = 0.05116 in, C
Maximum wire: 0.03840 · C = 0.06556 in, C

Female thread 0.75-16 PUSH-BUTT-2B

Gage pitch tolerance (X): 0.00030 in
Gage flank angle tolerance: 10 min
Gage major / minor tolerance: 0.0006 in
Gage pitch diameter tolerance: 0.00030 in
PD equivalent of pitch and flank tolerance: 0.0008 in
GO pitch diameter limit: 0.7125 in
NOT GO pitch diameter limit: 0.7187 in
NOT GO truncated crest diameter: 0.7406 in
Plain gage tolerance: 0.00010 in
Root relief width GO: 0.010438 in
Root relief width NOT GO: 0.015625 in

Notes

Table 5 prints allowance 0.0042 for 16 TPI, over 0.7 thru 1.0; the Sec. 7 formula (= Class 3 PD tolerance) gives 0.0041. Printed value kept. Class 2: no taper/roundness requirement (para. 6.6.1).
allowance printed 0.0042 (Table 5), formula 0.0041

Mates

0.75-16 PUSH-BUTT-2A screws into a thread of the same standard at the same size and pitch. The standard mating internal thread is class 2B. Check the fit with the standard pair →

Working out the mating options…

Different pitch or a different thread family never mate; the fit check runs over both tolerance zones.

Related thread sizes

Same diameter other pitch, and neighbouring sizes

→ 0.75" × 12 TPI → 0.75" × 20 TPI → 0.625" × 20 TPI → 0.875" × 10 TPI → 0.75" × 16 TPI internal

All values for 0.75-16 PUSH-BUTT-2Aevery column of the workbook row

All values of the workbook row 0.75-16 PUSH-BUTT-2A
Designation	0.75-16 PUSH-BUTT-2A
Decimal designation	0.7500-16 PUSH-BUTT-2A
Threads per inch	16
Thread form	PUSH-BUTT
Series (Table 1)	PUSH-BUTT
Series name	Push type, rounded root
External / internal	External
Class	2A
Nominal size (in.)	0.75
Pitch P (in.)	0.06250000
Basic major dia D (in.)	0.7500
Size category	Table 1 combination
Source table	Table 3, Tables 1, 2, 5
Printed page	4, 5, 6, 10
Major dia max (in.)	0.7458
Major dia min (in.)	0.7396
Major dia tolerance (in.)	0.0062
Major dia status	Toleranced: D - G (max), minus the PD tolerance (min) (paras. 6.2, 7)
Allowance G (in.; internal: mating external value, reference)	0.0042
Tolerance range (Tables 3-5)	Over 0.7 thru 1.0
Range over (in.)	0.7
Range thru (in.)	1.0
Range mean dia for formula (in.)	0.850
Length of engagement Le = 10P (in.)	0.6250
Basic pitch dia E = D - h (in.)	0.7125
Pitch dia max (in.)	0.7083
Pitch dia min (in.)	0.7021
PD tolerance (in.)	0.0062
Basic minor dia K = D - 2h (in.)	0.6750
Minor dia max (in.)	0.6630
Minor dia min (in.)	0.6516
Minor dia tolerance (in.)	0.0114
Minor dia status	Max = D - 1.32542P - G; min is reference only = min PD - 0.80803P (para. 6.3, Sec. 4)
Root radius max (in.)	0.004463
Root radius min (in.)	0.002231
Root truncation s max (in.)	0.005163
Root truncation s min (in.)	0.002581
Engagement height he max (in.)	0.035400
Engagement height he min (in.)	0.029200
Lead + flank PD-equivalent limit (in.)	0.00620
Lead variation alone ± (in.)	0.00348
45° flank variation alone ± (deg)	5.221
7° flank variation alone ± (deg)	11.022
Lead angle at basic PD (deg)	1.5994
Lead angle (deg min)	1° 36′
Tensile stress area As (sq in.)	not given in the standard
Thread angle (deg)	52
Pressure (load) flank angle (deg)	7
Clearance flank angle (deg)	45
Flank orientation	Push type (external thread pushes): 7° load flank leads, 45° clearance flank follows (Sec. 9)
Sharp V height H (in.)	0.055665
Basic thread engagement height h (in.)	0.037500
Thread height hs = hn (in.)	0.041419
Crest truncation f (in.)	0.009083
Crest width F (in.)	0.010198
Sweep cut: start diameter (in.)	0.745800
Sweep cut: tip diameter (in.)	0.663000
Sweep cut: depth (in.)	0.041419
Sweep cut: profile width at start diameter (in.)	0.052303
Sweep cut: tip width (root flat S max or radius r max) (in.)	0.004463
Constant c = 0.80803P (in.)	0.050502
PD tolerance component 0.00854√P (in.)	0.002135
W gage: pitch tolerance (in.)	0.00015
W gage: 7° flank tolerance (min)	10
W gage: 45° flank tolerance (min)	8
W gage: major/minor tolerance (in.)	0.0006
W gage: PD tolerance (in.)	0.00020
W gage: PD equivalent of pitch/flank tol. (in.)	0.0005
Z plain gage tolerance (in.)	0.00010
GO gage PD limit (in.)	0.7083
NOT GO gage PD limit (in.)	0.7021
NOT GO crest/minor truncated dia (in.)	0.6802
Setting plug truncated major dia (in.)	0.7333
Root relief width GO (0.167P) (in.)	0.010438
Root relief width NOT GO (0.25P) (in.)	0.015625
Best-size wire (in.)	0.03384
Measurement constant C, best wire (in.)	0.05116
Maximum wire (in.)	0.03840
Measurement constant C, max wire (in.)	0.06556
Check against formulas	allowance printed 0.0042 (Table 5), formula 0.0041
Notes	Table 5 prints allowance 0.0042 for 16 TPI, over 0.7 thru 1.0; the Sec. 7 formula (= Class 3 PD tolerance) gives 0.0041. Printed value kept. Class 2: no taper/roundness requirement (para. 6.6.1).

ASME B1.9: Buttress Inch Screw Threads. Source: workbook data (2026-10-10). Confirm against your licensed copy of the standard before use.