3" × 5 TPI PUSH-BUTT (push type) Internal Thread Specifications

3-5 PUSH-BUTT-2B · 3.0000-5 PUSH-BUTT-2B

ASMESTD: ASME B1.9SOURCE: Table 3, Tables 1, 2, 5TYPE: Internal (nut/tapped hole)CLASS: 2BFLANKS 7° / 45°ROOT: roundTable 1 combination

Thread profile

3-5 PUSH-BUTT-2B: solid = maximum material, dotted = minimum material. Flanks 7° (pressure) and 45° (clearance) from the radial line, 52° thread angle; drawn to scale.

Limits of size, class 2B

Dimension	Basic	Max	Min	Tolerance
Major diameter DnRoot of the female thread, min = D + 0.12542p; max for reference	3.0000	3.0523ref.	3.0251
Pitch diameter EMin = D − h	2.8800	2.8907	2.8800	0.0107
Minor diameter KnCrest of the female thread, min = D − 2h	2.7600	2.7707	2.7600	0.0107
Root radius rRound root, female (Fig. 1a)		0.014282	0.007140

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 male thread, limits of size, class 2A

Dimension	Basic	Max	Min	Tolerance
Major diameter dCrest of the male thread, max = D − G	3.0000	2.9929	2.9822	0.0107
Pitch diameter EMax = D − h − G	2.8800	2.8729	2.8622	0.0107
Minor diameter KsRoot of the male thread; min is a reference value	2.7600	2.7278	2.7006ref.	0.0272ref.
Allowance GSpace below basic size; equals the Class 3 PD tolerance (Sec. 7)		0.0071
Root radius rRound root, male (Fig. 1a)		0.014282	0.007140
Thread engagement heh − G/2 at max, less the PD tolerance at min		0.116450	0.105750

Lead, flank angle and length of engagement

Lead + flank variation limit Σ: 0.01070 inPitch diameter equivalent of lead and flank errors together (Class 2: the PD tolerance; Class 3: half)
Lead variation alone ±δl: 0.00601 inAllowable lead error if there is no flank error
45° flank angle variation alone ±δα: 2.816 °Half-angle error of the clearance flank
7° flank angle variation alone ±δα: 5.944 °Half-angle error of the pressure flank

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

Male thread 3-5 PUSH-BUTT-2A

Gage pitch tolerance (W): 0.00030 in
Gage 7° flank angle tolerance: 5 min
Gage 45° flank angle tolerance: 4 min
Gage major / minor tolerance: 0.0008 in
Gage pitch diameter tolerance: 0.00025 in
PD equivalent of pitch and flank tolerance: 0.0010 in
GO pitch diameter limit: 2.8729 in
NOT GO pitch diameter limit: 2.8622 in
NOT GO truncated crest diameter: 2.7922 in
Setting plug truncated major diameter: 2.9529 in
Best-size wire: 0.10829 · C = 0.16369 in, C
Maximum wire: 0.12287 · C = 0.20975 in, C

Female thread 3-5 PUSH-BUTT-2B

Gage pitch tolerance (X): 0.00040 in
Gage flank angle tolerance: 5 min
Gage major / minor tolerance: 0.0008 in
Gage pitch diameter tolerance: 0.00050 in
PD equivalent of pitch and flank tolerance: 0.0012 in
GO pitch diameter limit: 2.8800 in
NOT GO pitch diameter limit: 2.8907 in
NOT GO truncated crest diameter: 2.9607 in
Plain gage tolerance: 0.00020 in
Root relief width GO: 0.033400 in
Root relief width NOT GO: 0.050000 in

Notes

Class 2: no taper/roundness requirement (para. 6.6.1).

Mates

3-5 PUSH-BUTT-2B takes a thread of the same standard at the same size and pitch. The standard mating external thread is class 2A. 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

→ 3" × 10 TPI → 3" × 12 TPI → 3" × 16 TPI → 3" × 4 TPI → 3" × 6 TPI → 3" × 8 TPI → 2.75" × 8 TPI → 3.5" × 10 TPI → 3" × 5 TPI external

All values for 3-5 PUSH-BUTT-2Bevery column of the workbook row

All values of the workbook row 3-5 PUSH-BUTT-2B
Designation	3-5 PUSH-BUTT-2B
Decimal designation	3.0000-5 PUSH-BUTT-2B
Threads per inch	5
Thread form	PUSH-BUTT
Series (Table 1)	PUSH-BUTT
Series name	Push type, rounded root
External / internal	Internal
Class	2B
Nominal size (in.)	3
Pitch P (in.)	0.20000000
Basic major dia D (in.)	3.0000
Size category	Table 1 combination
Source table	Table 3, Tables 1, 2, 5
Printed page	4, 5, 6, 10
Major dia max (in.)	3.0523
Major dia min (in.)	3.0251
Major dia status	Min = D + 0.12542P (basic); max is reference only = max PD + 0.80803P (para. 6.3, Sec. 4); no tolerance specified
Allowance G (in.; internal: mating external value, reference)	0.0071
Tolerance range (Tables 3-5)	Over 2.5 thru 4
Range over (in.)	2.5
Range thru (in.)	4.0
Range mean dia for formula (in.)	3.250
Length of engagement Le = 10P (in.)	2.0000
Basic pitch dia E = D - h (in.)	2.8800
Pitch dia max (in.)	2.8907
Pitch dia min (in.)	2.8800
PD tolerance (in.)	0.0107
Basic minor dia K = D - 2h (in.)	2.7600
Minor dia max (in.)	2.7707
Minor dia min (in.)	2.7600
Minor dia tolerance (in.)	0.0107
Minor dia status	Toleranced: min = D - 2h (basic), max = min + PD tolerance (para. 6.2)
Root radius max (in.)	0.014282
Root radius min (in.)	0.007140
Root truncation s max (in.)	0.016520
Root truncation s min (in.)	0.008260
Engagement height he max (in.)	0.116450
Engagement height he min (in.)	0.105750
Lead + flank PD-equivalent limit (in.)	0.01070
Lead variation alone ± (in.)	0.00601
45° flank variation alone ± (deg)	2.816
7° flank variation alone ± (deg)	5.944
Lead angle at basic PD (deg)	1.2663
Lead angle (deg min)	1° 16′
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.)	0.178128
Basic thread engagement height h (in.)	0.120000
Thread height hs = hn (in.)	0.132542
Crest truncation f (in.)	0.029064
Crest width F (in.)	0.032632
Sweep cut: start diameter (in.)	2.760000
Sweep cut: tip diameter (in.)	3.025100
Sweep cut: depth (in.)	0.132542
Sweep cut: profile width at start diameter (in.)	0.167368
Sweep cut: tip width (root flat S max or radius r max) (in.)	0.014282
Constant c = 0.80803P (in.)	0.161606
PD tolerance component 0.00854√P (in.)	0.003819
X gage: pitch tolerance (in.)	0.00040
X gage: flank angle tolerance (min)	5
X gage: major/minor tolerance (in.)	0.0008
X gage: PD tolerance (in.)	0.00050
X gage: PD equivalent of pitch/flank tol. (in.)	0.0012
Z plain gage tolerance (in.)	0.00020
GO gage PD limit (in.)	2.8800
NOT GO gage PD limit (in.)	2.8907
NOT GO crest/minor truncated dia (in.)	2.9607
Root relief width GO (0.167P) (in.)	0.033400
Root relief width NOT GO (0.25P) (in.)	0.050000
Check against formulas	OK
Notes	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.